液压减振器动态特性研究

Study on Dynamic Characteristics of the Hydraulic Shock Absorber

针对某抗蛇行减振器,利用液压减振器试验台进行测试,动态特性试验考虑频率和幅值两种因素。通过分析不同加载频率和不同加载幅值下测试结果,给出减振器动态特性。测试结果与Maxwell减振器理论模型结果对比分析发现,Maxwell模型能够较好地模拟减振器相位角随加载频率变化的规律,但无法准确反映出减振器的动态阻尼系数和动态刚度。试验结果显示,动态阻尼系数在低频时随频率增大而增大,高频时随频率增大而减小;动态刚度在低频时随频率增大而增大,频率高于4Hz时,动态刚度趋于平稳。

For a snake-shaped shock absorber, the hydraulic shock absorber test bench is used to test. The dynamic characteristic test takes two factors into account： frequency and amplitude. The dynamic characteristics of the shock absorber are given by analyzing the test results under different loading frequencies and different loading amplitudes. Comparing the test results with the theoretical model results of Maxwell shock absorber, it is found that the Maxwell model can well simulate the law of the phase angle changing with the loading frequency, but it can not accurately reflect the dynamic damping coefficient and dynamic stiffness of the shock absorber. The experimental results show that the dynamic damping coefficient increases with the increase of frequency and decreases with the increase of frequency at low frequency, and the dynamic stiffness increases with the increase of frequency at low frequency, and when the frequency is higher than 4Hz, the dynamic stiffness tends to be stable.