非线性能量阱对飞轮振动抑制效果的实验研究

Experimental Research on Vibration Suppression for a Flywheel Based on Nonlinear Energy Sink

利用薄片金属梁作为非线性刚度元件,构建一种非线性能量阱。为了验证非线性能量阱对飞轮振动特性的抑制效果,搭建地面飞轮测试系统。分别采用力锤敲击和飞轮以恒定转速运行的方法施加不同载荷,对安装非线性能量阱前后测试系统各典型位置的振动响应进行对比研究。利用实测数据,采用傅里叶变换方法将动态响应信息分别在时间域和频率域内展开。研究表明:力锤敲击产生的冲击载荷和飞轮以恒定转速运行产生的稳态载荷均可以激发非线性能量阱定向能量传输;受非线性能量阱的影响,柔性支架设备安装面和飞轮安装面振动响应得到有效抑制。但是,由于非线性能量阱阻尼和吸振子质量较小,不同程度削弱了其振动抑制效果。

A nonlinear energy sink（NES） with a thin metal beam as its nonlinear stiffness element is provided in this paper. In order to verify the effectiveness of the nonlinear energy sink,a test rig of a flywheel system is constructed.Compared with the vibrational responses from the different typical parts in the test rig with and without the NES,the effectiveness of the NES is verified under the different excitations from the impact hammer and the rotating flywheel. The dynamic responses data are transferred to time-domain and frequency-domain respectively by using the Fourier transform.According to the experimental results,it can be concluded that the performance of the directional energy transfer of the NES is excited from the transient excitation and steady state loading respectively. In addition,the responses of the device position and flywheel position in the flexible bracket are suppressed due to the influence from the NES. However,its effectiveness is restricted for the lumped mass and the damping coefficient of the NES are all too small.