| Author Name | Affiliation | Postcode | | Xin Liu* | School of Mechanical Engineering,Changshu Institute of Technology,Suzhou | 215000 | | Mingwei Lu | Department of Virtual Simulation,Suzhou Sonavox Electronics Co,Ltd,Suzhou | 215100 | | Yang Zhou | Department of Virtual Simulation,Suzhou Sonavox Electronics Co,Ltd,Suzhou | 215100 | | Yuanyuan Zhang | Department of Virtual Simulation,Suzhou Sonavox Electronics Co,Ltd,Suzhou | 215100 | | Jiju Guan | School of Mechanical Engineering,Changshu Institute of Technology,Suzhou | 215000 |
|
| Abstract: |
| Nonlinear behavior is important in the vibration test of engineering structures. In this study 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 constant one in the test. Then the measured frequency response function (FRF) is obtained. The equivalent stiffness or damping is estimated by FRFs for 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 the fitting results combined with HBM with first-order expansion. Constant response vibration test is illustrated by 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. |
| Key words: non-linearity identification sinusoidal sweep modal test constant response frequency response function |
| DOI：10.11916/j.issn.1005-9113.23058 |
| Clc Number:O322 |
| Fund: |
