| 摘要 |
PURPOSE:To perform accurate vibration tests, by using random noises containing a DC component of a magnification which can eliminate the mechanical back- lash amount of an exciter as a vibration signal of a prescribed waveform. CONSTITUTION:An aimed signal having the aimed waveform of a vehicle A at the location of a detector 5 is determined by measuring the output signal of the detector 5 by adding a vibration signal of a prescribed waveform to the exciter 1 of a system provided with the vehicle A, to which vibrations are added from the exciter 1, and the detector 5 fitted to an optional position of the vehicle A and finding the transfer function of the system. Then an initial excitation signal is found on the basis of the aimed signal and transfer function and added to the exciter 1. In this case, correction of the excitation signal is repeated until the error to the aimed signal of an actually working signal detected 5 at the time converges in a prescribed range. Since random noises containing a DC component of a magnification which can eliminate the mechanical back-lash amount of the exciter 1 as a vibration signal of a prescribed waveform, no influence is received and the same vibration as the actual vibration of the vehicle A can be obtained and, as a result, accurate tests can be performed, even if back-lash exists between the exciter 1 and vehicle A. |
