圆平板挤压膜实验及其参数识别

完成了简谐激励下水中平行圆板的挤压膜振动实验．用最小二乘法识别出非线性粘性挤压膜力模型中的４个系数．不同挤压膜厚、不同频率和不同振幅情况的数值模拟结果与实验值吻合较好．研究结果表明，所用模型可较好地描述粘性挤压膜运动，识别出的系数在一定范围内给出良好精度的数值模拟．

Experiment on the Squeeze film for a circular Plate in Water

Experiments on the squeeze film for a circular plate in water under sinusoidal excitation are performed. The four coefficients in the nonlinear theoretical model for the squeeze film are identified by using least square fitting. Numerical simulation for the response of the plate with the coefficients identified are compared with the experimental measurement, and good agreement is found for different combinations of experimental parameters (thickness of the squeeze film, excitation frequency and amplitude). It justifies the validity of the theoretical model for the squeeze film.