高层结构附加轨道非线性能量阱减振性能研究

Track nonlinear energy sink attached to a high-rise building for response mitigation

轨道非线性能量阱(Track Nonlinear Sink,轨道NES)是一类被动减振控制装置,通过附加质量块沿轨道运动提供非线性回复力,以达到降低主体结构响应的目的。对轨道NES的回复力和控制系统的运动方程进行了理论分析和公式推导。对附加于32自由度主体结构的轨道NES进行了参数优化,优化后的轨道NES减振性能良好,并对装置刚度的变化具有较高的鲁棒性,但对装置阻尼变化较敏感。基于此问题,提出了单边碰振轨道非线性能量阱(Single-sided Vibro-impact Track Nonlinear Energy Sink,SSVI轨道NES),并考察了SSVI轨道NES装置刚度和阻尼同时发生变化时的减振性能。结果表明SSVI轨道NES能够有效降低结构响应,并同时具有良好的NES刚度和阻尼鲁棒性。

Track nonlinear energy sinks(track NESs)are a type of passive structural control devices that can mitigate the vibration of a primary structure with a nonlinear restoring force.This nonlinearity is generated by the motion of the NES mass on a specially designed track.The nonlinear restoring force of track NESs and the equations of motion for control systems were analytically constructed.Parameters optimization was carry out for the track NES when attached to a 32 degrees of freedom primary structure.The optimized track NES performs effectively in response reduction and demonstrates better robustness against the changes of the device stiffness than the conventional TMD.The track NES is,however,sensitive to the changes of the device damping.To address this issue,single-sided vibro-impact track energy sinks(SSVI track NESs)were proposed.The control performance of the SSVI track NES was investigated in consideration of the effects of device stiffness and damping.The results show the SSVI track NES is able to effectively mitigate structural responses with improved robustness against the changes of device stiffness and damping.