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本文分析了油的可压缩性对电液服伺振动台及电液伺服疲劳试验机输出特性(幅值)的影响。并以系统的执行机构(作动筒)这一环节推导出因油液的压缩引起作动简输出幅值衰减的传递关系公式。根据负载特性及设定的边界条件,对公式进行了简化。把已简化计算公式列于表一。在工程计算中可根据具体情况从表中直接使用标准环节的曲线进行计算。结合表一中所列的三种主要负载即惯性负载弹性负载粘性负载分别进行了讨论。并且对振动台的理论频响及实际频响进行比较给出了上限工作频率点的最佳值对电液伺服疲劳试验机及电液激振器的弹性负载,其油的可压缩性引起输出幅值减小。对于其他负载情况可以类推。结论:由于油的可压缩性的存在会造成疲劳试验机的输出幅值衰减;对电液何服振动台由于油的可压缩性对输出参数的影响与工作频率的活塞自激频率有关。与减小油的可压缩性带来的输出幅值的变化,要提高油柱的刚度系数。惯性负载要减少不必要的负载质量。粘性及弹件负载应减少不必要的负载力.图1幅,表1。
This paper analyzes the compressibility of oil on the electro-hydraulic servo vibration table and electro-hydraulic servo fatigue testing machine output characteristics (amplitude). And the actuator of the system (actuator) of this part of the derivation of the hydraulic fluid compression caused by the output amplitude attenuation of the transmission relationship formula. According to the load characteristics and set the boundary conditions, the formula has been simplified. Put the simplified calculation formula in Table 1. In engineering calculation can be calculated according to the specific situation from the table directly using the standard curve. The three main loads listed in Table 1, namely, the inertial load elastic load and the viscous load are discussed separately. And the theoretical frequency response of the vibration table and the actual frequency response are compared to give the maximum value of the upper limit of the operating frequency point of the electro-hydraulic servo fatigue testing machine and electro-hydraulic vibration exciter load, the compressibility of the oil causes the output Amplitude decreases. For other load cases can be analogized. Conclusion: Because of the compressibility of oil, the output amplitude of fatigue testing machine will decay. The influence of electro-hydraulic shaking table on the output parameters due to compressibility of oil is related to the self-excited frequency of piston. And to reduce the compressibility of the oil caused by the output amplitude changes, to increase the stiffness coefficient of the oil column. Inertial load to reduce unnecessary load quality. Viscous and elastic load should reduce unnecessary load force.