Abstract
To measure the acceleration waveform in the distribution environment with distribution data recorder, there are
two measurement modes, threshold mode and intermittent mode, in general. Conventionally, intermittent mode has been adopted to record the truck board vibration data which deduces PSD for random vibration test. However, it is ineffective to collect the data with intermittent mode in some respects. Then, threshold mode is supposed to resolve this problem.
In this paper, which is aimed to substitute threshold mode for the truck board, it is examined the modified technique that the way to correct PSD of threshold mode for PSD of intermittent mode. Here, reproducing
quasi-threshold mode through the recorded data of truck board on the analysis software is applied to figure out the influence of threshold on PSD. As a result, there is the negative correlation between RMS value and number of frame,and the optimal regression equation was derived. Therefore, this equation provides that threshold PSD can correct to intermittent PSD with accuracy. Moreover, validity of this equation is verified by another vibration data.
