Figure 10.
Two vibration analysis plots labelled a and b compare accelerometer, Y O L O, T E M A, and tracker measurements. Plot A presents acceleration in metre per second squared on the vertical axis ranging from minus 800 to 800 and time in second on the horizontal axis ranging from 0.1 to 0.3 second. All four signals oscillate around zero with repeated positive and negative peaks. The accelerometer signal reaches the largest amplitudes, with peaks above 600 metre per second squared and troughs below minus 700 metre per second squared near 0.20 to 0.24 second. The Y O L O and tracker signals follow similar oscillation patterns with lower amplitudes, generally between minus 500 and 600 metre per second squared. The T E M A signal presents the smallest amplitude variations throughout the time range. Plot b presents amplitude in metre per second squared on a logarithmic vertical scale ranging from 0.001 to 1000 and frequency in hertz on the horizontal axis ranging from 0 to 200 hertz. A dashed vertical line is positioned near 85 hertz. All four spectra contain a dominant peak near this frequency. The accelerometer spectrum reaches the highest amplitude near 100 metre per second squared at approximately 85 hertz. The Y O L O, tracker, and T E M A spectra also present peaks near the same frequency with lower amplitudes distributed across the remaining frequency range.Comparison of accelerometer measurement and three analysed results: (a) time histories, and (b) FFT