Shock and Vibration Application Brief
Walt's group uses DADiSP
, the graphic display data processing software
from DSP Development Corporation
. Walt purchased his group's first
copy of DADiSP and liked it so much that DADiSP is now used extensively
Somewhere between 70 and 120 revolutions of a rotor assembly take place
in a six-to-eight second test recording. DADISP is used to sort them
out and extract them by means of a macro that Walt wrote himself.
Next, time domain, frequency domain, and order domain analyses are
carried out on the extracted data, and hardcopy plots are generated.
Analysis results are compared to the tested vehicle's component
characteristics and to data from other divisions. At this point in the
testing cycle, suggestions are made about mechanical modifications that
might help produce a quieter or more comfortable brake.
Walt says that before his team started using DADiSP, going from the
operations test to the data analysis took up to two weeks. Three
computers were running "round the clock" doing data downloading and
conversion. Now, this procedure takes under an hour. At their current
rate of productivity, the research team appreciates DADiSP's storage
capabilities, which enable them to compare one day's process data to
the next. Walt says he particularly likes DADiSP's capacity for custom
automation. He has built up a library of application-specific macros
that he wrote himself to isolate selected data for analysis. He also
uses DADiSP at conferences, using its display capabilities for
DADiSP, Sharing Data, Sharing Results
"We find data-swapping and comparison much easier with DADiSP," says
Walt, "especially since other research divisions at Allied now use it."
Data downloading, manipulation, and sharing are so easy now that
engineers can investigate the physical problems causing excessive
vibration much more quickly after testing than they could before they
acquired DADiSP. With the testing and analysis done at Allied Signal,
you will never have to notice your brakes working.