Identification of Systems Containing Nonlinear Element Using Constant Response Vibration Tests  

作　　者：Xin Liu Mingwei Lu Yang Zhou Yuanyuan Zhang Jiju Guan 

机构地区：[1]School of Mechanical Engineering,Changshu Institute of Technology,Suzhou 215000,Jiangsu,China [2]Department of Virtual Simulation,Suzhou Sonavox Electronics Co.,Ltd.,Suzhou 215100,Jiangsu,China

出　　处：《Journal of Harbin Institute of Technology(New Series)》2024年第6期49-59,共11页哈尔滨工业大学学报（英文版）

摘　　要：Nonlinear behavior is important in the vibration test of engineering structures. In this study, a constant response vibration test is proposed for nonlinear element extraction. The method is based on the principle of Harmonic Balance Method (HBM). The stiffness or damping can be regarded as constant for particular steady displacement or velocity response. The displacement or velocity is controlled as a constant in the test. Then the measured Frequency Response Function(FRF) is obtained. The equivalent stiffness or damping is estimated using FRFs for a particular vibration response level. The displacement-dependent stiffness and velocity-dependent damping are fitted to describe the unknown non-linearity. The nonlinear spring and damping force can be obtained by combining the fitting results with HBM using first-order expansion. Constant response vibration test is illustrated through experimental setup to verify its effectiveness. Experimental results show that the procedure is capable of achieving an accurate parameter identification of nonlinear damping and stiffness, which is hopeful for industrial application.

关 键 词：non-linearity identification sinusoidal sweep modal test constant response frequency response function 

分 类 号：TH113.1[机械工程—机械设计及理论]