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从液压阻尼器动力学模型入手,考虑油液含气量对油液压缩性的影响,建立了带定压活门的液压阻尼器动力学模型.对阻尼器在不同激振下的阻尼力及等效阻尼进行了数值仿真,仿真结果表明理论结果与实验值符合,验证了该模型的准确性.对不同含气量时阻尼器的响应进行计算,证实了油气混合会降低液压阻尼器的阻尼力和等效阻尼.将理论模型用于预估双频激振下的阻尼器等效阻尼,发现高频背景振动使低频小幅值扰动的等效阻尼严重下降,而对低频大幅值扰动等效阻尼的影响则要小得多.
Starting from the dynamic model of hydraulic damper, the dynamic model of hydraulic damper with constant pressure valve was established considering the influence of oil content on oil compressibility. The damping force of damper under different excitation and its equivalent The simulation results show that the theoretical results agree well with the experimental ones, which verifies the accuracy of the model.Calculation of the damper response at different gas contents confirms that the mixing of oil and gas will reduce the damping force of the hydraulic damper, etc. The theoretical model is used to predict the equivalent damping of dampers under dual-frequency excitation. It is found that the high-frequency background vibration seriously degrades the equivalent damping of low-frequency and small-amplitude disturbances, while the equivalent damping of large- The impact is much smaller.