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dataPAC User’s Guide

209

Chapter 6

6.

Frequency Response Function (FRF)

This chapter shows you how to use the Frequency Response Function to
determine the resonant frequency and relative dynamic stiffness of a
structure. The FRF feature is only available for the dataPAC 1500.

Overview of the dataPAC 1500 FRF Module ..................................... 210

Hardware Required by the FRF Module ............................................ 210

Understanding the Concepts Behind the FRF Module ...................... 216

Setting Up FRF Measurements .......................................................... 219

Collecting and Analyzing FRF Data .................................................. 226

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

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Содержание dataPAC 1250

Страница 1: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

Страница 2: ...UIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before pur...

Страница 3: ...al for using the dataPAC Entek IRD International Corporation P N 44853 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Inst...

Страница 4: ...this Manual to be disclosed in any form whatever including orally or by electronic transmission to anyone other than an authorized representative of the User s employer who also shall agree not to di...

Страница 5: ...d officer of Entek IRD In any event delivery shipping and service dates are always quoted subject to unavoidable delays due to causes beyond Entek IRD s control including but not limited to strikes ca...

Страница 6: ...mance With respect to performance related in any way to the passage of time to the year 2000 and beyond or the occurrence of a leap year Entek IRD does not make any representation or warranty Entek IR...

Страница 7: ...ow it is affixed to Customer s real property and Entek IRD reserves a purchase money security interest in the product until the purchase price has been fully paid Customer agrees to execute and hereby...

Страница 8: ...i dataPAC Data Collector User s Guide Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOU...

Страница 9: ...Operating System Version Number 29 Changing the Display Contrast 29 Restarting the Data Collector 29 Loading the Operating System with the dataPAC Utility Program 30 Using Other Features of the dataPA...

Страница 10: ...iewing Bands and Alarms 79 Reviewing Spectra Data 81 Using the Cursors with a Spectrum 81 Using Dual Cursors with a Spectrum 82 Using Sideband Cursors with a Spectrum 84 Using Harmonic Cursors with a...

Страница 11: ...ecting Off Route Time Waveform Measurements 128 Setting Up Off Route Time Waveform Measurements 128 Collecting Off Route Time Waveform Measurements 133 Setting Up Off Route gSE Time Waveform Measureme...

Страница 12: ...Taking a Residual Measurement 189 Two Plane Balancing with a Reference Trigger 190 Taking the Initial Vibration Measurement 190 Adding the Trial Weight and Taking a Measurement in Plane 1 193 Adding t...

Страница 13: ...e 225 Setting Up the FRF Measurement 225 Collecting and Analyzing FRF Data 226 Reviewing the FRF Data 228 Structural Analysis Using the FRF 232 Appendix 237 Frequently Asked Questions and Answers 237...

Страница 14: ...dataPAC Data Collector User s Guide Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOUR...

Страница 15: ...online help system and Customer Support Overview of the dataPAC 14 Using the Manual 14 Using the Online Help Systems 16 Contacting Customer Support 16 Artisan Technology Group Quality Instrumentation...

Страница 16: ...maintenance abilities of the dataPAC you can z Collect magnitude process spectrum time and phase data z Store collected data on a memory card z Review collected data z Balancing applications are inclu...

Страница 17: ...estions The Glossary contains definitions of terms used in this manual Document conventions There are several document conventions used in this Guide including the following z The data collector is re...

Страница 18: ...acific time zones is available until 7 00 p m eastern time You can send a fax detailing your questions or comments 24 hours a day by dialing 513 576 4213 Please address the fax to the Customer Support...

Страница 19: ...PAC Battery Pack and Charger 22 dataPAC Windows and Screens 23 Basic dataPAC Operations 28 Loading the Operating System with the dataPAC Utility Program 30 Using the dataPAC Setup Program 36 Using Mem...

Страница 20: ...ata collector in this User s Guide This chapter discusses the basic operations of the dataPAC including how to z Check and charge the batteries z Power the data collector on and off z Initialize the d...

Страница 21: ...ove the key The Main keys are designed for right and left handed operation and all keys give tactile feedback through a metal snap dome In addition an LED light and audible feedback a beep are availab...

Страница 22: ...when moving through different menus and making selections within menus Menu keys are located below the display Press the key to activate the function in white Press the shift key before pressing the k...

Страница 23: ...labeled F1 through F5 The text in the display directly above a softkey describes its function at any given time When no text appears above a softkey the key is inactive in the current window Data Coll...

Страница 24: ...oting the number in the upper right corner of the display The battery level indicator shows the relative strength of the batteries based on the following table Level Meaning 1 3 or 1 4 Typical value i...

Страница 25: ...ife If you will not use the instrument for more than two weeks remove the batteries to prevent damage Caution Turn off the dataPAC before removing the batteries Removal of batteries for more than 15 m...

Страница 26: ...F2 Stop Once you have entered a program there are two methods for moving back to the Program Manger window without closing that program z Press SHIFT RETURN MANAGER to switch without closing the curr...

Страница 27: ...tiffness of a structure Help Menu 1250 only The dataPAC contains an extensive context sensitive online help system that you can access through the Help icon in the Program Manager or by pressing SHIFT...

Страница 28: ...the cursor position 3 Manually advance the cursor to the next position by pressing the right arrow key 4 To add or change another character repeat as needed You can use the arrow keys to move the cur...

Страница 29: ...the name of the area then press SELECT to enter that area You will then see a list of topics for that area in a topics window To view help information about a topic in the list use the arrow keys to h...

Страница 30: ...llector storage capacity Powering Up the Data Collector To power up the data collector press the ON OFF key located in the lower left hand corner After a brief display of the logo screen the Program M...

Страница 31: ...ay contrast to your liking Repeat by pressing SHIFT and the arrow key again until the display is adjusted properly You can do this from any screen in the dataPAC Restarting the Data Collector You shou...

Страница 32: ...hold the ON OFF key for at least ten seconds Loading the Operating System with the dataPAC Utility Program The dataPAC Utility program transfers the operating system files from your computer to your d...

Страница 33: ...ataPAC 1500 selected 5 Under Communications choose Direct 6 Choose the Setup button 7 Select the correct communications settings by selecting the correct port and baud rate for your connection under D...

Страница 34: ...tions available through the dataPAC Utility Program The dataPAC Utility Program allows you to z Obtain security key information which tells you which optional items are available for your dataPAC z Cr...

Страница 35: ...omputer You use areas during remote transfer To create or remove an area follow these steps 1 Connect the dataPAC to the computer with a serial cable or place the PCMCIA card in the card drive 2 Start...

Страница 36: ...appears Choose Yes to delete the area To move files from one area to another area 1 Connect the dataPAC to the computer with a serial cable or place the PCMCIA card in the card drive 2 Start the data...

Страница 37: ...ile contains the information for data collection An Unload Route file contains data collection information and data collected A Balance file contains balancing information 7 Select the file name and c...

Страница 38: ...process of collecting data See Setting Up Data Collection Options on page 38 Instrument Options Specify parameters for system functions such as system units See Setting Up Instrument Options on page...

Страница 39: ...ndow appears 4 Use the arrow keys to select the desired setup category and press SELECT The selected window appears This example shows the Data Collection Options Artisan Technology Group Quality Inst...

Страница 40: ...or IQ2000 version 3 and higher multiple data sets are supported Warn On Overwrite When this option is selected the dataPAC displays a dialog box asking for confirmation before it overwrites existing d...

Страница 41: ...faults when it is installed If the transducer passes the test the dataPAC does not repeat the test each time a measurement is initiated However if the transducer fails the test at installation and you...

Страница 42: ...the units of measure for frequency Highlight this option Press SELECT to open a pop up menu showing two options CPM cycles per minute and Hz Hertz cycles per second Highlight your choice and then pres...

Страница 43: ...ou to set up basic functions of the dataPAC Enabled options show an X in the checkbox next to them To change the status of an option use the arrow keys to highlight the option then press SELECT You ca...

Страница 44: ...play the total number of FFT bins and the bin width in Hz or CPM The setting for this item is downloaded from the host computer along with other route information Fmin Fmax Enable this option to displ...

Страница 45: ...hest amplitude signal within the spectral data The position of the amplitude cursor is used by the Peak picking function during FFT display See Changing the Spectrum Display on page 168 for more infor...

Страница 46: ...e Rate Enable this option to display the total time taken to collect one data set in seconds degrees or revolutions followed by the corresponding rate in CPM or Hz on your time waveform Number of Samp...

Страница 47: ...and updated Averaging Information Enable this option to display the number of averages used to obtain the displayed data and the type of averaging Date Time Collected Enable this option to display th...

Страница 48: ...e on the softkey Available cursor types are z D Dual Cursors The dual time cursors are useful for determining the time between two points on the time waveform or the time of any given sample relative...

Страница 49: ...for the dataPAC s internal clock You can set the formats for the display as well Use the arrow keys to select the field you want to change Press SELECT to drop down the list of selections and use the...

Страница 50: ...rs and displacement non contact pickups as well as a generic DC input for process related data Once a generic type has been installed it can be edited and the changes stored Once a default type has be...

Страница 51: ...arrow keys and press SELECT 3 Press the F1 to choose Setup Category The Setup Category menu appears 4 Select Transducer Options by pressing the arrow keys then press SELECT The Transducer Options wind...

Страница 52: ...hlight Cancel then press SELECT 7 The dataPAC displays the selected transducer name and characteristics in the window The following example shows the Generic Accelerometer one of four transducer defin...

Страница 53: ...t High value is displayed after the transducer is installed You can enter a number from 19 0 to 20 0 Volts DC Fault Low Volts DC Set this field lower than the lowest average DC voltage that can reason...

Страница 54: ...windows 3 Press DONE when you complete the changes to the selected field s The Transducer Options window reappears 4 Repeat steps 2 and 3 for other fields if needed Once all fields are correct press F...

Страница 55: ...PAC memory card into the data collector through a door in the top of the dataPAC Close all applications and turn the dataPAC off before opening the door With the front of the dataPAC facing you open t...

Страница 56: ...if your memory card does not have a removable battery The battery lock switch must remain in the locked position to retain the battery holder The battery lock position is to the left The lithium batt...

Страница 57: ...within the dataPAC Utility program or through EMONITOR Odyssey or Enshare if you are using EMONITOR Odyssey or Enshare The dataPAC uses a PCMCIA memory card for storage The dataPAC can store the oper...

Страница 58: ...left and right arrow keys the dataPAC first tries to boot from the card then checks the serial connection and keeps going back and forth until it finds a suitable program image Because the dataPAC goe...

Страница 59: ...memory cards for storage All dataPAC models support 256K 512K 1 MB 2 MB and 4 MB memory cards The dataPAC 1500 V5 supports 6 MB and 8 MB cards The older releases put a 4 MB format on a 6 MB card You c...

Страница 60: ...hlight the Memory Card icon in the Program Manager window then press SELECT The dataPAC displays the Memory Card Manager window Note An O next to the used space column indicates that the database is i...

Страница 61: ...ms in grey cannot be deleted Note If needed you can delete the Boot Image file Once the file is loaded it is stored in the dataPAC resident memory The memory card will no longer be bootable and you wi...

Страница 62: ...ard It should fit only one way While the key is in you have to leave the memory card door open 4 Turn the data collector on by pressing ON OFF This action transfers the token from the key to the dataP...

Страница 63: ...ty days ERROR Instrument time predates security key This message indicates that the instrument clock time is set to a time earlier than the time that a temporary security key token was first installed...

Страница 64: ...s Guide Chapter 2 The dataPAC Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www...

Страница 65: ...e following sections Overview of Collecting Data 64 Preparing for Data Collection 64 Collecting Programmed Data 66 Reviewing Overall Data and Alarms Reports 74 Reviewing Spectra Data 81 Reviewing Wate...

Страница 66: ...h a list z Entering inspection codes z Reviewing collected data z Saving dataPAC screen shots When you finish collecting data you can unload the data into your computer database files Preparing for Da...

Страница 67: ...elect before starting data collection These options affect the measurement the data collection process and the data display The dataPAC stores these options even when powered off However you should ch...

Страница 68: ...a Collection program Then open the Setup program to select the interval settings you want for the data collection program The Data Collection program must be running in order for the data to be collec...

Страница 69: ...art it again 4 Once in Data Collection mode press F1 Setup 5 In Setup mode press F1 Setup Category Use the arrow keys to select Transducer Options and press SELECT 6 Choose F2 Install Xdcr 7 Use the a...

Страница 70: ...neric Accelerometer even if a host software defined transducer named Accelerometer is required If you are having trouble with the program running correctly check the units of the installed transducer...

Страница 71: ...n to collect just one point at each of the programmed collection times If Auto Advance is disabled then the same point is collected at each programmed collection time If Auto Advance is enabled then t...

Страница 72: ...collection cycle The programmed collections occur at the specified interval If it takes 5 minutes to collect all the data but you have the interval set for one minute the dataPAC will finish the data...

Страница 73: ...taPAC prompts you to do so See Installing and Defining dataPAC Transducers on page 48 3 Press SELECT to save the setup with the name in the dialog box The following dialog box appears Artisan Technolo...

Страница 74: ...ECT The following dialog box appears 5 The dialog box above informs you about the route name that will be used Press SELECT The following dialog box appears Artisan Technology Group Quality Instrument...

Страница 75: ...dataPAC beeps three times to signal when each data cycle has been collected 7 When the program has completed all data cycles the following dialog box appears Press SELECT to finish using programmed da...

Страница 76: ...eview Data program the Select Route window opens Use the arrow keys to highlight the name of the route you want to select then press SELECT Make sure that the DONE box in the window is highlighted the...

Страница 77: ...asurement is available the dataPAC alerts you to this To move through the collected data In the top left corner of the window the dataPAC displays a complete identifier for the point you are viewing E...

Страница 78: ...in the same route press SELECT This action causes the dataPAC to return to the Data Collection window and display the first point on the route z To switch to a different route press SKIP to open the...

Страница 79: ...st point on the route z To switch to a different route highlight New Route and then press SELECT In the Select Route window highlight a route name and press SELECT Then highlight DONE and press SELECT...

Страница 80: ...he Available Data popup window In the window highlight your choice then press SELECT Reviewing Overall Speed Alarms The Available Data window shows the different types of data If you collected that ty...

Страница 81: ...e alarm and a down arrow to indicate a below alarm The Alarm Message is the text downloaded from your host software In the diagram above the text was downloaded from EMONITOR Odyssey or Enshare Review...

Страница 82: ...e is in the Threshold column An up arrow indicates an above alarm a down arrow indicates a below alarm The Alarm Message is the text downloaded from your host software In the diagram above the text wa...

Страница 83: ...puted instead of the raw spectrum data Using the Cursors with a Spectrum Cursors are available to precisely identify numerical values in a spectrum measurement Cursors are drawn as either dashed or do...

Страница 84: ...r mode Cursor modes are z Cursor Type D Dual Cursors z Cursor Type H Harmonic Cursors z Cursor Type S Sideband Cursors z Cursor Type F Diagnostic Frequency Cursors z Cursor Type P Peak Cursors Using D...

Страница 85: ...contract to show any bins immediately outside the current display range To calculate Band RSS Amplitude In dual cursor mode the Band RSS Amplitude field in the information display at the top of the s...

Страница 86: ...ght The frequency of the primary cursor is displayed in the information display at the top of the screen as Cursor Frequency and is updated as you move the primary cursor The sideband frequency is dis...

Страница 87: ...y window with harmonic cursors To move harmonic cursors The fundamental cursor is positioned by default at the machine speed loaded with the route data or manually entered at collection time However y...

Страница 88: ...ostic Frequency You can press SHIFT and the left or right arrow keys to quickly move to each diagnostic frequency The label is shown in the upper portion of the screen This example shows Motor Speed I...

Страница 89: ...mation display area and turns off the softkeys and status line leaving a maximum display area available to view the spectrum You can move the cursors while in this mode Pressing any other key returns...

Страница 90: ...ta on the graph Frequency Zoom Between Cursors This option resamples the data taking a true zoom measurement using the high and low cursors for Fmin and Fmax This option is only available when Dual cu...

Страница 91: ...For example it uses in s instead of mm s Amplitude Metric This option selects Metric units for display of amplitude values for example mm s instead of in s Amplitude Log This option selects a logarit...

Страница 92: ...o to display all available FFT items in the information display at the top of the screen The FFT Display Options in the Setup Utility determine what displays here The More Info option displays everyth...

Страница 93: ...rent peaks When there is insufficient room to display all the peaks the peak list is created with a vertical scroll bar and the list scrolls when you move the selection beyond the upper and lower extr...

Страница 94: ...l softkeys You can press SELECT when the arrow on the right is pointing to a highlighted spectrum to view just that spectrum Press SELECT again to return to the waterfall view To select the spectrum w...

Страница 95: ...of FFTs from 6 to 24 which are currently displayed on the Data Sets screen The cursor position determines the center point of the reduced data set To list the stored data sets in a table Pressing F4 T...

Страница 96: ...left hand part of the display Gaps indicate that there are more spectrum that are currently being displayed The bar in the middle represents the selected or highlighted spectrum The number at the end...

Страница 97: ...arrow keys to activate the cursor and move it along the time waveform There are three kinds of cursors available with the time waveform display z Single Cursor Displays only the horizontal and vertica...

Страница 98: ...een shows the amplitude difference between time waveform samples at the high and low cursor positions The Delta Time Freq readout shows the difference in time between the high and low cursors The Delt...

Страница 99: ...labeled Move Cursor I when the key press adjusts the interval and the key is labeled Move Cursor P when the key press adjusts the position The Delta Time Freq display shows the time interval between...

Страница 100: ...ackard printer Our tests have shown that Canon and Epson printers are not compatible with the print direct accessory Note If you want to print a previously captured image file start the Memory Card Ma...

Страница 101: ...emory Card Manager See Using the Memory Card Manager on page 58 for more information Transferring Images to your Computer Once you have captured images on your dataPAC you can transfer them to a compu...

Страница 102: ...C scrnview exe The utility screen appears 3 From the Setup menu choose Unload Device The computer displays the Setup Transfer Device dialog box Use this dialog box to select the Transfer Device and Ba...

Страница 103: ...AC Screen Print and View Utility Viewing Captured Screens on your Computer After the computer transfers the images they are displayed on the screen in either multiple image mode or single image mode B...

Страница 104: ...int Preview to see how your images will look on the printed page You can print from the Print Preview window or close it and resize your images using the left and right arrow buttons 4 Follow the dial...

Страница 105: ...you want to automatically print reports directly after unloading For more information on printing reports or plots using EMONITOR Odyssey or Enshare refer to the EMONITOR Odyssey or Enshare User s Gui...

Страница 106: ...Chapter 3 Collecting and Reviewing Data Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Instrumentation Guaranteed 888 88...

Страница 107: ...g Up and Collecting Off Route Spectrum Measurements 112 Setting Up and Collecting Off Route Orders Measurements 121 Setting Up and Collecting Off Route Time Waveform Measurements 128 Setting Up and Co...

Страница 108: ...ment You may also simply want to use the dataPAC as a real time analyzer solving problems without actually storing the data on your computer To unload unscheduled measurements into the host software y...

Страница 109: ...choose Delete z To return to the Analysis application without saving the route choose Cancel The following sections describe the steps necessary to set up and collect off route measurements Ranging Me...

Страница 110: ...to select Overall Measurement Parameters then press SELECT The dataPAC displays the Overall Measurement Parameters window 6 Press F1 Edit Point to change the measurement setup You can press SHIFT F1...

Страница 111: ...those that fall above the decayed value Hardware Range The Hardware Range parameter sets a maximum range for this measurement Selecting Auto Range causes the system to select an optimum range after y...

Страница 112: ...tart the measurement The dataPAC ranges and collects the data 3 Once the dataPAC collects the measurement press STORE again to save the measurement You can view the measurement in progress for as long...

Страница 113: ...tered measurement Collecting Dynamic Non Vibration Measurements dataPAC 1500 only You can set up and collect non vibration measurements such as voltage measurements using the dataPAC 1500 There are tw...

Страница 114: ...n press SELECT 2 Select a route or define a new route 3 Once in Data Collection mode press SHIFT F5 Off Route This copies all the point information to the new off route point definition The dataPAC di...

Страница 115: ...d to your dataPAC The choice of this parameter controls the list of possible selections available for the Measurement Variable parameter The dataPAC 1500 V5 allows you to choose Other so you can choos...

Страница 116: ...ments require less collection time Frequency Unit Press SELECT to toggle between CPM Hz and Orders Based Orders Track Low Frequency Corner The Low Frequency Corner defines the frequency below which th...

Страница 117: ...Defines the trigger event to occur on a rising edge from the internal vibration signal z Negative Slope Internal Defines the trigger event to occur on a falling edge from the internal vibration signa...

Страница 118: ...fied number of data sets are collected averaged together using a root mean square calculation with equal weight and then the measurement is stopped z Peak Hold The specified number of data sets are co...

Страница 119: ...ons on page 127 for more information about the Data Overwrite option The measurement is stored as an off route measurement at the storage point displayed below 3 Press DONE when you are finished You c...

Страница 120: ...u are in External mode For more information about the Strobe dB see Using the Strobe dB on page 165 2 Attach the transducer to the bearing housing 3 When the machine is shut down mark the rotor by mak...

Страница 121: ...ied by the cursor which are limited by the horizontal display magnification and by the FFT bin resolution 9 To conserve battery power the strobe output is disabled when you stop the measurement You ca...

Страница 122: ...ly stop the measurement without storing the data To stop and store a measurement 1 While collecting an off route spectrum measurement in the reduced screen you can press F4 Stop Meas Store Data If you...

Страница 123: ...n the samples may be constantly varying so that a fixed number of samples per shaft revolution is collected The X axis of the time waveform is no longer measured in seconds but instead it is measured...

Страница 124: ...ou can see the advantages of collecting orders tracking measurements as shown in these three examples Example 1 A uniform sampling rate for a machine running at constant speed The dataPAC does not tak...

Страница 125: ...blem occurs the rotating frequency and related components appear in multiple bins or lines in a frequency spectrum Example 3 Variable sampling rate synchronized with the rotational speed of a variable...

Страница 126: ...Orders Based your Frequency Max selections are in multiples of running speed such as 4X To collect Orders Based spectra you can either use a reference input trigger for machine speed or the dataPAC c...

Страница 127: ...have the same display unit orders in the X axis the data sampling and results are different for variable speed machines As shown in the figures below the smearing is obvious in the Orders Based spect...

Страница 128: ...ck eliminates the non synchronous frequencies from the spectrum Notice that when you select Orders Track your Frequency Max selections are in multiples of running speed such as 4X or 10X To collect Or...

Страница 129: ...wn in the Spectra Measurement Parameters menu Here is an example of an Orders Track spectrum measurement Here is an example of a zoomed in Orders Track measurement Note how clean the spectral line is...

Страница 130: ...me Waveform Measurements 1 In the Program Manager use the arrow keys to highlight the Data Collection icon then press SELECT 2 Select a route or define a new route 3 Once in Data Collection mode press...

Страница 131: ...riable The Measurement Variable parameter allows you to choose how to measure the signal coming from the transducer For example if you have a velocity probe you can measure either velocity or displace...

Страница 132: ...e cycles as specified by the total period The Orders Based selection can be used with or without a trigger If you do not use a tachometer then the dataPAC assumes the machine speed is the same as the...

Страница 133: ...his parameter selects the type of averaging for this measurement Your selections are z Moving The measurements are averaged using equal weighting until the specified number of averages has been collec...

Страница 134: ...this parameter is set to a value other than 1 there is an initial phase angle ambiguity z Tooth Count Indicates how many teeth are present on the external shaft and the internal shaft If these values...

Страница 135: ...ting the Data Collection Options on page 127 for more information about the Data Overwrite option The measurement is stored as an off route measurement at the storage point displayed below 3 Press DON...

Страница 136: ...ollects data showing that range in great detail allowing you to carefully analyze the results Hint This can be done automatically from a standard spectrum measurement Place the right and left cursors...

Страница 137: ...setup to your off route measurement Alternatively you can press SHIFT F2 Instrument Defaults to select the instrument defaults for your off route measurement Use the field descriptions below to set u...

Страница 138: ...display scaling parameter Display Scaling The Display Scaling parameter controls the scale used to display the measured data on the vertical axis Your choices are z Auto Scale The display scale automa...

Страница 139: ...the active spectral cursor The strobe should be connected to the dataPAC 1500 s DB 9 connector and must be compatible with a TTL trigger input See Driving a Strobe While Collecting an Off Route Spect...

Страница 140: ...Route Phase Magnitude Speed dataPAC 1500 only This section discusses setting up and collecting phase magnitude speed measurements off route The Phase Magnitude Speed measurement provides a single grap...

Страница 141: ...your off route measurement Alternatively you can press SHIFT F2 Instrument Defaults to select the instrument defaults for your off route measurement Use the field descriptions below to set up the mea...

Страница 142: ...t If you use the strobe the Trigger Control is automatically set to Slope Int Hardware Range This parameter is used to set a maximum range for this measurement Selecting Auto Range causes the system t...

Страница 143: ...Speed Measurements 1 Press STORE to start the measurement The dataPAC ranges and collects the data 2 Once the dataPAC collects the measurement press STORE again to store the measurement You can view...

Страница 144: ...r the item you are viewing with the strobe the Auto Speed function may not be able to detect the running speed 4 Use the up and down arrow keys on the dataPAC to adjust the strobe speed so that it mat...

Страница 145: ...us time profile is also collected The following parameters are available in Start Up Coast Down measurements Some are available only for Waterfall FFT or Bode Nyquist displays The Measurement Paramete...

Страница 146: ...f Clipping option then press SELECT to enable it If enabled the hardware re ranges if the signal amplitude exceeds the selected hardware range Press DONE when complete Note Auto Scale if Clipping is m...

Страница 147: ...Enables you to control when data is to be collected based on pressing STORE Frequency Max Press SELECT while in this box to display a list of maximum frequencies to use during measurement Use the arr...

Страница 148: ...out before the end of the time sample or for exactly periodic signals within the time sample The advantage of using this comes in start up or coast down if the windows are triggered by a signal in ph...

Страница 149: ...ge selects the rising edge for the trigger event and Trailing Edge selects the falling edge If the trigger input is a narrow negative pulse then leading edge selects the falling edge and trailing sele...

Страница 150: ...in the Measurement Variable parameter Note that this simply specifies the text that is used to label the measurement The scaling for the measured data is automatically set based upon the selected Unit...

Страница 151: ...s Display Update Use the SELECT key to toggle between Final Results and Live while in the Display Update box If set to Live the dataPAC displays the measured data immediately If set to Final Results t...

Страница 152: ...Type is set to something other than None press SELECT to toggle between Auto and TTL Auto sets the trigger level based on the trigger input signal TTL sets the trigger level to a value of 1 4 volts T...

Страница 153: ...es how to perform a typical Waterfall FFT start up or coast down analysis 1 Connect the reference input device to the dataPAC 1500 Align the reference input device photocell or laser tachometer to cap...

Страница 154: ...reviewing your data When you have manipulated the display to your satisfaction press DONE 11 Store the collected data by pressing F4 Store to Card Note that this option is only available when the data...

Страница 155: ...ow keys to move through the Measurement Parameters and set up the measurement See Setting Up Start Up Coast Down Measurements on page 143 for a description of each parameter 7 Select the correct trans...

Страница 156: ...y selected in Graph Type is shown The following diagram is an example of a Bode plot This diagram is an example of a Nyquist plot Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOU...

Страница 157: ...or Measuring Machine Speed The dataPAC has several ways to measure machine speed and this section discusses all of them Also it indicates which dataPAC models and which versions of software support th...

Страница 158: ...w machine speed manually z Select Tachometer to measure the new machine speed with a tachometer z The Spectra menu option provides some ability to measure the machine speed without using a tachometer...

Страница 159: ...asure exactly what you want This section shows you how to use an internal trigger source to collect data This section also offers information about performing a bump test with the internal trigger sou...

Страница 160: ...ighest point of vibration You want to place the trigger point slightly below the highest high water mark This diagram shows an example of a correctly set trigger level If the black bars go past the fu...

Страница 161: ...nning speed will cause the harmonic effects to lessen To perform a bump test follow these steps 1 Set up an internally triggered spectrum measurement on the dataPAC 1500 2 Press the STORE key so that...

Страница 162: ...apter 4 Off Route Analysis with the dataPAC Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Instrumentation Guaranteed 888...

Страница 163: ...Balancing Parameters 163 One Plane Balancing with a Strobe Light 165 Two Plane Balancing with a Strobe Light 175 One Plane Balancing with a Reference Trigger 184 Two Plane Balancing with a Reference...

Страница 164: ...an equal amount of weight in the opposite direction These methods go through the technique with stopping points where you start and stop the machine to perform weight addition or subtraction There are...

Страница 165: ...ogram Manager window by using the arrow keys to select the Balancing icon and pressing SELECT The Balancing Options window opens 2 Set the Balance Options by using the arrow keys to move through the B...

Страница 166: ...ions where the total number of positions equals the number of blades or vanes from the reference notch or mark You must tell the dataPAC whether you are measuring the angle with or against the directi...

Страница 167: ...the stroboscope depress the trigger You can lock the trigger in position using the side locking button Push the trigger as far as it will go and then press the locking button Release the trigger with...

Страница 168: ...n to use as a reference point If the object being viewed is perfectly symmetrical then you need to mark the object with a piece of tape or paint in a single location only to be used as a reference poi...

Страница 169: ...scopes must be used when you can t shut down the device The human eye is not easily tricked into seeing a stopped image by a stroboscope when the flash rate is slower than 300 FPM Therefore stroboscop...

Страница 170: ...ow See Installing and Defining dataPAC Transducers on page 48 for more information 6 Press F1 Positions to enter the number of positions The number of positions refers to the number of rotor component...

Страница 171: ...machine and allow it to reach normal running speed 9 Press STORE to take an initial vibration measurement Note You can press F3 Backup to revert to a previous screen or in some cases press F3 Go To t...

Страница 172: ...e strobe it is in fact running Touching the machine while it is running can cause injury z Press F1 Auto Speed to capture the RPM of the machine If the strobe flash rate is close to the actual 1X mach...

Страница 173: ...t a time Or press F1 and F2 to move the mark incrementally by 20 at a time in either direction As you move the reference mark you will see the Phase Adjust angle value change on the Balancing window A...

Страница 174: ...from the reference mark in the direction specified in the Weight Placement field on the Balance Options Screen Press DONE when complete Notice after you have entered the trial weight the lower half o...

Страница 175: ...easurement 1 The dataPAC has calculated and now displays a recommended balancing weight labeled Correction on the dataPAC display Attach correction weight according to the display The Position column...

Страница 176: ...readings After securely attaching the trim weight bring the rotor up to balance speed and press STORE The dataPAC takes vibration readings calculates new trim weights and displays it as before If the...

Страница 177: ...ion press F2 Continue Loaded Run The Balancing window opens 2 Select the correct transducer setting If necessary press F2 Transducer to open the Transducer Options window See Installing and Defining d...

Страница 178: ...more information 5 Select the correct vibration units by pressing F5 Vibration Units to open the vibration units window The units selected must be compatible with the installed transducer Use the arro...

Страница 179: ...with the strobe it is still running Touching the machine while it is running can cause injury z Press F1 Auto Speed to capture the RPM of the machine If the strobe flash rate is close to the actual 1X...

Страница 180: ...eys to move the mark one degree at a time Or press F1 Decrease 20 deg and F2 Increase 20 deg to move the mark incrementally by 20 at a time in either direction As you move the reference mark the Phase...

Страница 181: ...nits of measure for each plane 4 Enter the plane 1 trial weight location Use the edit window to enter the location of the trial weight on the rotor in the first plane If the machine has no vanes or bl...

Страница 182: ...not change significantly If this happens you are given the choice to Continue or Backup You can Backup and add more weight if you want 8 When the marker appears to be frozen press STORE 9 Adjust the p...

Страница 183: ...e total number of vanes or blades In either case the position is measured from the reference mark in the direction specified in the Weight Placement field on the Balance Options screen Press DONE when...

Страница 184: ...the correction weight z For rotors with zero positions the position is shown in degrees in the direction of rotation set in Weight Placement from the 0 mark z For rotors with multiple positions or va...

Страница 185: ...rrection weight attached securely restart the machine and allow it to reach normal operating speed 3 Press STORE to begin taking a residual measurement You will take measurements in both the first and...

Страница 186: ...IFT F5 The Save Balancing Data window appears Enter the file name When your entry is complete press DONE or press SHIFT F5 Abort to cancel the entry If the rotor is still out of balance repeat trial w...

Страница 187: ...ey or keyway Note If the rotor has multiple positions vanes or fan blades the reference mark must be at one of the blade positions 4 Start a balancing session by pressing either F2 or F4 To enter new...

Страница 188: ...s selected in the dataPAC Instrument Options screen See Setting Up Instrument Options on page 40 7 Select the correct vibration units by pressing F5 Vibration Units The units selected must be compatib...

Страница 189: ...u have completed the initial measurement The Edit Trial Weight window opens 2 Enter the trial weight using the Edit Trial Weight window When your entry is complete press DONE The dataPAC displays the...

Страница 190: ...Enable or disable averaging by pressing F1 Enable Disable Averaging during measurement This allows you to turn on or off vibration and phase averaging Averaging helps to stabilize the vibration and ph...

Страница 191: ...ach the weight the number of degrees or position in the direction of rotation set in Weight Placement away from the reference mark Note Always view the direction of rotation from the same point With m...

Страница 192: ...5 The Save Balancing Data window appears Enter the file name When your entry is complete press DONE or press SHIFT F5 Abort to cancel the entry However if the rotor is still out of balance repeat addi...

Страница 193: ...s on a fan Enter 0 for a rotor without vanes or blades or enter the number of vanes or blades When your entry is complete press DONE To cancel press SHIFT F5 Abort Note Vibration units and speed displ...

Страница 194: ...er if values slowly creep to a higher or lower value you can turn averaging off to discard the previous values and read a true value more quickly 12 When the speed vibration and phase values are stabl...

Страница 195: ...ONE To cancel press SHIFT F5 Abort 3 The dataPAC displays the Weight Units window Highlight a unit of measure on the displayed list and press SELECT The units selected for the trial weights become the...

Страница 196: ...ades Notice that after you enter the trial weight the lower half of the dataPAC display indicates the initial vibration in both planes as well as the trial weight just entered The dataPAC updates the...

Страница 197: ...re continuing to the next step 12 Press STORE to complete the measurement 13 Shut down the machine and continue the balancing procedure in the next section Leave the plane 1 trial weight on the rotor...

Страница 198: ...ize before continuing to the next step 8 Enable or disable averaging by pressing F1 Enable Disable Averaging during measurement This allows you to turn on or off vibration and phase averaging Averagin...

Страница 199: ...rrection weight z For rotors with zero positions the position is shown in degrees in the direction of rotation set in Weight Placement from the 0 mark z For rotors with multiple positions or vanes the...

Страница 200: ...ch normal operating speed 3 Press STORE to begin taking a residual measurement 4 The dataPAC automatically measures the speed vibration and phase in the first plane The values are constantly updated o...

Страница 201: ...f balance repeat adding the correction weight and taking residual measurements as many times as are necessary until the rotor is properly balanced If the balance never improves check to see if you ent...

Страница 202: ...listening server mode in order to receive route files from the dataPAC To start the server mode follow these steps 1 Start the dataPAC Utility Program by pointing to it on the Start menu 2 Choose the...

Страница 203: ...r a connection from the dataPAC This dialog box appears when the connection is complete Setting Up Remote Transfer on the dataPAC There are several settings that you must enter for the modem connected...

Страница 204: ...r most Hayes compatible modems Call Wait Disable The Call Wait Disable field contains the special dialing characters that cause call waiting to be disabled during a telephone call Common choices inclu...

Страница 205: ...ard Number should usually be proceeded by the S character These characters are dialed after the Phone Number and are the last characters dialed Signaling The Signaling field contains the signaling met...

Страница 206: ...ss the arrow keys to highlight Save As then press SELECT 3 Enter the name in the Save Settings Screen 4 Press DONE to save the settings To load previously saved settings follow these steps 1 Press F3...

Страница 207: ...ctor When the following dialog box appears the computer is ready to receive a call from the dataPAC Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan...

Страница 208: ...cation then press F1 Connect Modem 4 The dataPAC dials the number designated and connects to the host computer 5 Choose F2 Unload and select the Area typically ENTEK 6 Select a Balance Run from a list...

Страница 209: ...machine speed start with a value higher and work your way down until you get only one reference mark z You can enter the machine speed in the Machine Speed edit window then make fine or large adjustm...

Страница 210: ...a time Or press F1 Decrease 20 deg and F2 Increase 20 deg to move the mark incrementally by 20 at a time in either direction As you move the reference mark the Phase Adjust angle value changes in the...

Страница 211: ...e is only available for the dataPAC 1500 Overview of the dataPAC 1500 FRF Module 210 Hardware Required by the FRF Module 210 Understanding the Concepts Behind the FRF Module 216 Setting Up FRF Measure...

Страница 212: ...pedance and dynamic stiffness z Test the data for coherence Note You cannot unload FRF data to your host software program You can however use screen captures of your data or print the plots directly F...

Страница 213: ...your tip selection by the frequency range and impact duration needed for the test Steel tips provide a short duration high amplitude excitation across a wide frequency range Conversely rubber tips pro...

Страница 214: ...pact from the steel hammer tip This waveform of the force channel shows an impact that is very sharp and short in duration The steel tip is very hard so when you strike a structure with it there is vi...

Страница 215: ...s can be misleading When you are setting up to collect FRF measurements you should take a look at the force spectrum to determine that the hammer and tip you are using is sufficient to measure the fre...

Страница 216: ...ause double hits So you may want to use a softer tip for some applications Another characteristic of a softer tip is the ability to concentrate more energy into the lower frequencies Compare the graph...

Страница 217: ...d to concentrate more energy into the lower frequencies The graphs shown below were made by using two rubber tips on top of each other You can experiment with several tips until you find a suitable fr...

Страница 218: ...y response tool kit should include a variety of accelerometers ranging from 10 to 500 mV g Three or four pickups within this sensitivity range 10 50 100 and 500 mV g allows you to test a wide variety...

Страница 219: ...r each frequency FRF Module Requires Linear Structure Response In order for the frequency response functions to be able to predict a mechanical structure s behavior to real world forces using a simple...

Страница 220: ...se an accelerometer to measure the output response the instrument integrates the acceleration signal to compute velocity or double integrates to compute displacement The table below lists the six freq...

Страница 221: ...applies a force window mathematical filter The force window has leading and trailing cosine curves and only admits data input for a short time immediately following the input excitation event hammer...

Страница 222: ...er what mounting method you use is free of debris as clean as possible and flat Any rocking or movement of the pickup in relation to the mounting surface seriously degrades data quality In choosing a...

Страница 223: ...to proceed with setting up for the initial FRF testing 1 After completing the physical connection sequence turn on the dataPAC and start the FRF application by choosing the FRF icon from the Program...

Страница 224: ...gger Slope SHIFT F5 toggles the trigger slope direction z Spectrum F1 presents the spectrum of the most recent hammer blow Pressing it again returns you to the waveform view Note It is important to re...

Страница 225: ...ow keys to select the measurement parameters for the Response Channel in the text mode See Response Channel Setup Text Mode on page 225 for information on each field You cannot change a parameter if i...

Страница 226: ...1 If you are uncertain what value should be specified here enter a value that is 10 to 15 times greater than the base sensitivity of the force hammer and be sure to test and adjust it from the dynamic...

Страница 227: ...een to predetermine a range automatically The dataPAC does not perform an automatic ranging operation during sampling of the FRF data because no automatic ranging process is fast enough to prevent los...

Страница 228: ...g data samples To do so follow these steps 1 Press F3 FRF Measurement The measurement screen appears 2 Press F3 Display Options and press SELECT to view the available display types Artisan Technology...

Страница 229: ...ace Alternatively choose None for the top trace and the bottom trace displays full screen Examples of different combinations of displays are shown in Reviewing the FRF Data on page 228 4 If you have A...

Страница 230: ...y data set which contains undesirable conditions For example the data in the display below shows both Overload and Double Hit conditions 7 Once you acquire satisfactory data you can review it and anal...

Страница 231: ...s 11 775 g Pound Force and is clearly the highest amplitude in the displayed spectrum To zoom in and zoom out The dataPAC normally uses the auto scale to fit the data in the display When you see a ver...

Страница 232: ...display is zoomed in one more time and dominant peak was no longer in the display area the spectrum is now rescaled for the smaller peak at 72 000 CPM Press F5 Zoom Out to return to full scale displa...

Страница 233: ...isibility of lower amplitude peaks Both the amplitude scale and the frequency scales can be viewed logarithmically rather than linearly Amplitude and frequency scales options are independent of each o...

Страница 234: ...lot from a dual plot display so you can see more detail To display two plots set both the top trace and bottom trace as shown below Structural Analysis Using the FRF FRF testing allows us to compare t...

Страница 235: ...f the repeatability and reliability of the data collected Just as averaging is considered necessary for reliable FFT data averaging is also necessary for good FRF testing Coherence measures the input...

Страница 236: ...n of a machine the machine may run through critical speeds that excite the shaft mass natural frequencies and may cause significant increases in the vibration amplitude You can use a Bode plot to dete...

Страница 237: ...resonant frequencies In viewing the phase plots you need to be aware that the phase measurements near the axes can wrap around to the other axis You can see this wrapping in the phase plot below at a...

Страница 238: ...Chapter 6 Frequency Response Function FRF Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Instrumentation Guaranteed 888 88...

Страница 239: ...ds that operating system If not you can load the operating system over the serial port from your computer See Restarting the Data Collector on page 29 for more information about restarting your dataPA...

Страница 240: ...dataPAC User s Guide Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg...

Страница 241: ...and and band peak The Band maximum amplitude is the highest amplitude at a spectral line in a band band set One or more bands each of which defines a specific frequency range A band set might contain...

Страница 242: ...uencies below the defined frequency It is useful as an anti aliasing filter magnitude alarm An alarm that defines the safe operating boundary for magnitude data from a piece of equipment or a process...

Страница 243: ...e current state of the data collector Pressing the key below the softkey label accesses the displayed operation spectral line A spectral line is an individual discrete frequency in a spectrum measurem...

Страница 244: ...ata collector waterfall spectra A spectral display that shows several spectra over time cascading them using time as the z axis zoom A focus on the frequency range that you specify collecting data sho...

Страница 245: ...spectrum 42 time waveform 45 B Backlight Time Out Minutes 40 balance runs remote transfer 199 balancing 1 and 2 plane 164 Auto Speed 170 177 207 Balancing Options window 163 one plane with reference...

Страница 246: ...Data Collection Options 38 65 data collector 1000 1250 1500 models 14 display contrast 29 operating system 30 operating system version number 29 Data I O port 21 Data Overwrite 38 Data Sets spectrum...

Страница 247: ...46 Fmin Fmax 42 font size Memory Card Manager 59 review data 79 80 force channel setup FRF dynamic mode 221 FRF text mode 223 force hammer characteristics 211 masses 211 overview 210 211 striking the...

Страница 248: ...pectrum 131 off route spectrum parameters 116 off route true zoom 137 lines See also resolution List of Databases 58 lithium battery 54 loading image 30 operating system 30 over a modem 199 remote 206...

Страница 249: ...m 134 off route overall collecting 108 setting up 108 off route phase collecting 141 setting up 139 off route phase magnitude speed 138 off route spectrum collecting 112 collecting orders based 121 li...

Страница 250: ...Rectangular window off route spectrum 113 off route time waveform 136 Start Up Coast Down 146 Rejection Mode FRF 225 remote transfer 33 host computer set up 200 overview 199 set up dataPAC 201 Remote...

Страница 251: ...t Up Coast Down 143 148 Speed Check 39 Speed Units 40 Speed Linear Start Up Coast Down 145 151 Speed Log Start Up Coast Down 145 151 start up coast down Bode Nyquist plots 151 153 Bode Nyquist overvie...

Страница 252: ...ing 176 191 unloading balance runs 199 over a modem 199 remote 204 unscheduled measurements See also off route up arrow key 21 Used Space 58 V variable sampling rate 123 version number data collector...

Страница 253: ...UIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before pur...

Страница 254: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

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