90
7)
Enter a name for the peak-acceleration summary report file, and click
Save
. MultiReview compiles and saves
the summary report. You can open the report in applications, such as Microsoft Excel, that can read CSV files.
Compiling a Peak-Excursion Summary Report
A peak-excursion summary report shows, for each mark in each file, the frequency at which the maximum
displacement (peak excursion) of the AMS was recorded, and the amplitude of that displacement for each of the X,
Y, and Z traces. The amplitude is shown in units of millimeters. The peak excursion at each mark is found from the
frequency-domain data by calculating the displacement (
d
) for each frequency, using the following formula.
d =
A
ω
2
Where the frequency is ω/2π Hz, and A is the amplitude at that frequency. The maximum excursion for a
given mark is the largest value of
d
for the frequency spectrum at that mark, with the following restrictions.
•
Only frequencies above 5 Hz are evaluated because of limits in the AMS electronics.
•
Only sustained signals are evaluated, that is signals that last longer than the FFT sample size.
The report can summarize data from up to 50 log files. Different log files can have different settings for filter and
FFT sample size, so when compiling a report, MultiReview uses the same settings for all file. The settings are
determined by the following.
•
The settings for the most recent log file opened (other than a comparison file).
•
The settings you make using the
Settings
menu items.
The default report format uses a vertical layout for each of the X, Y, and Z traces: the table of amplitude data is
listed first, and the table of frequency data follows below the amplitude data. You have the option of choosing a
horizontal layout: the table of frequency data is listed to the right of the table of amplitude data.
Different log files can have different annotations for the marks in the file, so by default, the report identifies the
marks as Mark 1, Mark 2, Mark
n
...,and so on. You have the option of having the report identify the marks by using
the annotations for the marks from the first file you open.
