基于非线性压缩变换的纤维增强复合薄板非线性阻尼的时域测试方法

Time-domain test method for nonlinear damping of fiber reinforced composite thin plate based on nonlinear squeezing transform

提出了基于非线性压缩变换的纤维增强复合薄板非线性阻尼的时域测试方法。基于非线性压缩变换构造了理论分析信号,并推导获得了复合结构系统非线性阻尼的表达式,明确了从时域测试角度获取非线性阻尼参数的理论原理。编写了Matlab算法,并用数值算例证明了该算法的正确性。总结并概括出一套合理、规范的测试流程,并对TC500碳纤维/树脂基复合薄板进行了实际测试。实践证明,利用所提出的方法可以有效获得复合薄板在不同衰减时刻对应的阻尼参数,该方法可以用来定量评价不同振动幅值及频率下复合结构的非线性阻尼特性。

A time-domain test method for nonlinear damping of fiber reinforced composite thin plate based on nonlinear squeezing transform was proposed.The analytic signal was constructed based on the nonlinear squeezing transform,and the expression of nonlinear damping of the composite structure system was derived,so that the theoretical principles of acquiring the nonlinear damping parameters from the time-domain test view could be clarified.Then,the Matlab algorithm was written and numerical example was used to prove the correctness of the algorithm.The reasonable and standard test procedures were summarized and applied to real measurement of TC500 carbon fiber/resin composite thin plate.It was proved that the proposed method can effectively obtain its damping parameters in different decay time,thus it can be used to quantitatively evaluate nonlinear damping characteristic of composite structure under different excitation amplitudes and frequencies.