挤压油膜阻尼器油膜阻尼系数识别及分析

为了进行挤压油膜阻尼器油膜阻尼系数识别的实验研究，首先,利用信号发生器和功率放大器对双向激励实验器进行激振；然后，借助阻抗头获得激励和响应数据；最后，基于机械阻抗原理，通过最小二乘法拟合，得到挤压油膜阻尼器的油膜阻尼系数。通过改变油膜宽度和油膜间隙，研究不同挤压油膜阻尼器参数对油膜阻尼的影响。研究结果表明，随着油膜宽度的线性增大，油膜阻尼呈现非线性增大的趋势。可以通过增大油膜宽度和油膜阻尼，来提高阻尼器的减振性能。随着油膜间隙的线性增大，油膜阻尼呈现非线性减小的趋势，减振性能下降。

Damping Coefficient Identification and Analysis for Squeeze Film Dampers

In order to identify damping coefficients of SFD, the experimental tests were researched. Firstly, the bidirection excitation rig was excited by signal generator and power amplifier. Then the excitation and response data were obtained by impedance head. Lastly, damping coefficients of SFD were obtained by the least squares fit based on the principles of mechanical impedance. The influence of SFD parameters on damping coefficients was researched by changing oil width and clearance. The experimental tests show that the oil damping presents a trend of nonlinear increase with the increase of oil width. Oil damping can be increased by increasing the oil width, then the damping performance of the damper is improved. With the increase of the oil film gap, oil damping presents a trend of nonlinear decrease, and damping performance is declined.