自调频TMD及其减振效果的数值模拟

The Semi-adaptive Tuned Mass Damper and the Numerical Simulation of its Effect on Controlling Vibration

利用可调节水量的水箱代替TMD的质量块,加速度传感器和单片机电路板组成伺服控制系统,在特定的外界激励作用下,自发地启动驱动装置改变TMD质量块质量以调节TMD频率至控制结构频率附近,形成自调频TMD。建立单自由度体系在TMD控制下的动力学方程,利用Matlab的Simulink模块模拟变频率调节过程,及其在脉冲激励和不同频率的正弦激励下的结构响应,结果表明:自调频TMD在TMD频率偏离结构自振频率情况下,能调节自身频率至控制结构频率附近,降低结构加速度响应峰值,提高结构阻尼比。

The adaptive tuned mass damper was generated by a water tank instead of solid mass, a servo control system consists of acceleration sensors and a single chip microcomputer system which could start the drive to change TMD＇ s mass spontaneously to change TMD＇ s frequency to main structure near the natural frequency of vibration, under the special excitation. A dynamic equation of a single degree of freedom system under controlling of the TMD was set to simulate the adaptive adjustment and the system＇ s response under the pulse excitation and sine excitations with different frequency, using the Matlab Simulation module. It is shown that when the TMD＇ s frequency has deviated from the frequency of the structure, the semi-adaptive TMD can change its frequency to main structure＇ s. And it can reduce the structural acceleration response peak value and improve the structural damping ratio.