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Mass Body Data Collection System
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Numerical Analysis
![]() 10 Seconds of Mass Body Motion as Recorded From Test Vehicle Data Bus The above chart shows the mass body movement in speed, G force, and altitude for a 10-second time period. The figure below shows the same 10-second time period recorded accelerometer data and the associated frequency response spectrum. The data indicates vibrations from 100 Hz up to approximately 1 kHz with the peak vibration at 700 Hz. The frequency spectrum ends at 5 kHz because the anti-aliasing filter cuts the response of at that point. The analysis shown is for one axis on one 3-axis accelerometer. Similar plots are available from the other axis on the sensor as well as other sensors on the mass body. The number of sensors times and the number of time periods of interest generates a large amount of data. The analysis from one mass body test must be subdivided into time slices selected for both time position in the test and the duration of the data for the FFT analysis. It was found that giving the designer the ability to select sensors and time values in a graphical user's interface simplified the task of data analysis. Working from plots of the mass body external speed and position test data the designer easily selected sensor and time periods for analysis. The MatlLab program and user's interface generated all the frequency response charts as indicated below on demand quickly and easily. ![]() 10 Seconds of Accelerometer Data Centered at 6 hours, 58 Minutes, 30 Seconds Page: 1 | 2 | 3 | 4 | 5 | 6 | NEXT
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