基于主动阻尼的屈曲梁准零刚度隔振技术研究

准零刚度(QZS)隔振系统具有高静刚度-低动刚度的特性,能够对低频振动进行有效抑制,而主动阻尼能够显著降低系统的共振峰值同时保持系统高频传递特性不变。因此,将准零刚度隔振系统与主动阻尼相结合,可以有效提升系统的超低频隔振性能。以屈曲梁准零刚度隔振器为研究对象,基于系统动力学模型,引入主动阻尼控制策略,通过理论分析研究了主动阻尼对屈曲梁准零刚度隔振系统传递率的影响,并利用SIMULINK工具开展扫频、正弦和随机扰动条件下的屈曲梁准零刚度-主动阻尼隔振系统仿真研究。仿真结果表明:在超低频段(≤0.1 Hz)该系统能够产生8~32 dB的隔振效果;在高频段(≥10 Hz)隔振效率不低于36 dB,且对随机扰动响应的隔振效率为36 dB。

A study on vibration isolation based on a buckled beam quasi-zero-stiffness isolator and active damping

The quasi-zero-stiffness(QZS)isolator has character of high-static-low-dynamic-stiffness,and can be employed to suppress low-frequency vibration.Active damping control can reduce the resonance peak with keeping the transmissibility in high frequency band unchanged.It is effective to improve the performance of a QZS isolator by employing active damping control.In this paper,a buckled beam QZS isolator was adopted,and based on its dynamic model the active damping control was engaged to build an active-damping-QZS isolation system.The relationship between the isolation system transmissibility and active damping was studied by a theoretical method.Dynamic simulation was carried out in the SIMULINK software to study the performance of the isolation system in three conditions of sweep frequency disturbance,sinusoidal disturbance,and random disturbance.Simulation results indicate that in low-frequency-region(≤0.1 Hz)the amplitude of vibration was suppressed 8-32 dB,while in the high-frequency-region(≥10 Hz)the effect of vibration vilation was not less than 36 dB.In the random base disturbance condition,the vibration RMS was reduced 36 dB.