| 摘要 |
PURPOSE:To shorten a vibration testing time, by using random noises, whose frequency band is limited to those necessary for performing the vibration test, out of the oscillation frequencies of an aimed signal as a vibration signal of a prescribed waveform and finding a transfer function to frequency components in the same frequency band. 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 it is sufficient to use random noises, whose frequency band is limited to those necessary for performing the test, out of the oscillation frequencies of the aimed signal of the vehicle A as a vibration signal of a prescribed waveform and find a transfer function to the frequency component in the same frequency band, the calculating time is shortened and, accordingly, the testing time is also shortened. |
