Table of Contents
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dataPAC Data Collector User’s Guide
5. Balancing Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Overview of Balancing Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Setting Up the Balancing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
One Plane Balancing with a Strobe Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Using the Strobe dB+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Measuring Speed with a Strobe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Taking the Initial Vibration Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Adding the Trial Weight and Taking a Measurement . . . . . . . . . . . . . . . . . . . 171
Adding the Correction Weight and Taking a Residual Measurement . . . . . . . 173
Two Plane Balancing with a Strobe Light. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Taking the Initial Vibration Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Adding the Trial Weight and Taking a Measurement in Plane 1. . . . . . . . . . . 178
Adding the Trial Weight and Taking a Measurement in Plane 2. . . . . . . . . . . 181
Adding the Correction Weights and Taking a Residual Measurement . . . . . . 182
One Plane Balancing with a Reference Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Setting Up the Entach Digital Laser Tachometer . . . . . . . . . . . . . . . . . . . . . . 184
Taking the Initial Vibration Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Adding the Trial Weight and Taking a Measurement . . . . . . . . . . . . . . . . . . . 187
Adding the Correction Weight and 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 the Trial Weight and Taking a Measurement in Plane 2. . . . . . . . . . . 195
Adding the Correction Weights and Taking a Residual Measurement . . . . . . 197
Unloading Balancing Runs using a Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Setting Up Remote Transfer on the Host Computer . . . . . . . . . . . . . . . . . . . . 200
Setting Up Remote Transfer on the dataPAC . . . . . . . . . . . . . . . . . . . . . . . . . 201
Unloading Balancing Files to the Host Computer . . . . . . . . . . . . . . . . . . . . . . 204
Collecting Phase Measurements for Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
6. Frequency Response Function (FRF) . . . . . . . . . . . . . . . . 209
Overview of the dataPAC 1500 FRF Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Hardware Required by the FRF Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Force Hammer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Accelerometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Understanding the Concepts Behind the FRF Module . . . . . . . . . . . . . . . . . . . . . . 216
What is Stiffness?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Static vs. Dynamic Stiffness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
FRF Module Requires Linear Structure Response. . . . . . . . . . . . . . . . . . . . . . 217
Six Frequency Response Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Signal Processing Features of the FRF Module. . . . . . . . . . . . . . . . . . . . . . . . 219
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