基于磁化电流法的双稳态非线性能量阱抑振性能研究

RESEARCH ON VIBRATION SUPPRESSION PERFORMANCE OF BNES BASED ON MAGNETIZING CURRENT METHOD

为在宽频内实现对主系统的振动控制,设计了一种双稳态非线性能量阱(Bistable-Nonlinear Energy Sink,BNES),基于磁化电流理论对悬臂梁结构系统的空间磁力进行分析,研究磁间距大小及悬臂梁长度对BNES稳定点的影响。建立主系统耦合BNES的动力学方程,研究不同激励强度时BNES瞬态工作性能的稳定性。通过幅频特性研究磁间距对BNES的稳态减振性能影响,并分别研究了在0.5倍、1倍、1.5倍共振激振频率下,随激励强度变化,BNES工作性能的稳定性。分析结果表明,提出的BNES具有良好瞬态及稳态减振性能,且鲁棒性较好。

A bistable-nonlinear energy sink(BNES)is designed to control the vibration of the main system in a wide frequency range.The spatial magnetic force of cantilever structure system is analyzed based on the magnetizing current theory,and the influences of magnetic spacing and cantilever length on stability point of BNES are studied.The dynamic equations of main system coupling BNES are established to study the stability of transient performance of BNES under different excitation intensities.The effect of magnetic spacing on the steady-state vibration reduction performance of the BNES is studied through the amplitude frequency characteristics,and the stability performance of the BNES with the change of excitation intensity at 0.5 times,1 times and 1.5 times resonant excitation frequency is studied.The analysis results show that the proposed BNES has good transient and steady-state vibration reduction performance and good robustness.