1.序如本杂志(一九六六年Vol.3,№1)所介绍,电液疲劳振动试验机具有以往试验机所不备的最大特点——可以实现大负荷的随机振动。然而美中不足之处是:由于工作油的可压缩性,在于负荷质量之间产生谐振,因此,在此以上的频带上就难于实现随机控制,这样只得采取依靠振幅跟踪装置,将波形和相位加以忽略,而只对其振幅作一定地控制的方式。另 1. Preface As introduced in this magazine (Vol.3, 1966, No. 1, 1966), the electro-hydraulic fatigue vibration testing machine has the most outstanding features of the conventional testing machine - it can realize random vibration under heavy load. However, there are some disadvantages in that the randomness of the working oil is due to the compressibility of the working oil due to the resonance between the load qualities. Therefore, it is difficult to realize the random control in the above frequency bands. Therefore, only the amplitude tracking device is adopted to ignore the waveform and the phase , And only control the amplitude of its own way. another