MR阻尼器的半主动风振响应控制研究

Study on Semi-Active Control of MR Dampers with Wind Induced Response

利用MR阻尼器阻尼力可以调节的特性能实现对结构响应的半主动控制,直接根据结构的响应对MR阻尼器实施状态跳跃控制。本文对在风荷载作用下的MR阻尼器状态跳跃控制效果进行研究,通过单自由度和四自由度的两个数值算例进行研究,对比分析中采用了位移、速度、加速度等不同类型的控制参数、不同大小的控制参数以及不同峰值的输入脉动风压等多个相关参数,从计算结果可以发现,实施状态跳跃控制可以减少结构的风振响应,采用速度响应作为状态跳跃控制变量对于减少结构的加速度响应是有利的,可根据试算结果确定控制参数的最优值。这些结论与地震作用下的情况基本相同。

The semi-active control for structures can be realized by utilizing the characteristics of adjust￣able damping force of MR dampers. The state jump control can be implemented using the measured structural response. The state jump control of MR dampers was researched on structural response under wind load. By using two numerical examples of SDOF and 4DOF system, different type of parameter as displacement, velocity and acceleration, different value of control parameter and different peak value of input wind load were studied here. It is found that the wind induced response is reduced by implementing state jump control and the velocity response is benefit to be used as the state jump control parameter for reducing absolute acceleration, and the optimal value of the control parameter can be determined by trial method. The main conclusions are similar to the condition of seismic excitations.