摆式调谐质量阻尼器频率调节新方法

发布时间：2018-01-06 20:36

本文关键词：摆式调谐质量阻尼器频率调节新方法　出处：《振动工程学报》2016年06期 　论文类型：期刊论文

【摘要】：针对大型摆式调谐质量阻尼器(PTMD)频率调节较难的问题,提出了一种基于永磁体作用力的频率调节新方法,即在PTMD上附加安装永磁体刚度调节装置,通过调整永磁体产生附加刚度的正负与大小,改变PTMD的等效刚度,继而实现PTMD频率的双向调节。基于拉格朗日方程建立了PTMD与永磁体刚度调节装置耦合系统的运动微分方程,阐述了该频率调节方法的可行性,以及PTMD振动频率随幅值的定性变化规律,最后开展模型试验进一步验证与明确了永磁体作用力对PTMD频率的调节机理。理论分析与试验结果表明:当摆式PTMD质量块两侧均布置相吸永磁体时,PTMD频率降低;当布置相斥永磁体时,PTMD频率增大;PTMD频率调节初步设计时,永磁体作用力的附加刚度理论计算值宜适当折减后作为实际等效刚度,该折减系数可偏保守的取为0.5。
[Abstract]:A new frequency regulation method based on permanent magnet force is proposed to solve the problem that it is difficult to adjust the frequency of large swing tuned mass damper (PTMD). That is, the permanent magnet stiffness adjusting device is installed on the PTMD, and the equivalent stiffness of the permanent magnet is changed by adjusting the positive and negative additional stiffness and the size of the permanent magnet. Based on Lagrange equation, the motion differential equation of coupling system between PTMD and permanent magnet stiffness regulator is established, and the feasibility of this method is expounded. And the qualitative variation of PTMD vibration frequency with amplitude. Finally, the model test was carried out to further verify and clarify the mechanism of the permanent magnet force on the PTMD frequency. The theoretical analysis and experimental results show that: when the pendulum PTMD mass block is arranged to absorb the permanent magnet on both sides. PTMD frequency decreased; The frequency of PTMD increases when the mutually exclusive permanent magnets are arranged. In the preliminary design of PTMD frequency regulation, the theoretical calculation value of the additional stiffness of the permanent magnet force should be properly reduced as the actual equivalent stiffness, and the reduction coefficient can be taken as 0.5.
【作者单位】：华北水利水电大学土木与交通学院;
【基金】：国家自然科学基金资助项目(51308214) 河南省高等学校青年骨干教师资助计划(2015GGJS-104) 河南省教育厅科学技术研究重点项目(13A560711) 华北水利水电大学青年科技创新人才项目(2014)
【分类号】：TU352.1
【正文快照】： 引言调谐质量阻尼器(TMD)对风敏感结构振动控制效果突出,已在高耸建筑与大跨度桥梁结构得到广泛应用[1-3]。TMD主要由质量块、调谐频率的弹性元件与耗散结构振动能量的阻尼元件三大组件构成。适用于超高层建筑、高耸电视塔等结构风致振动控制的TMD主要是采用摆式结构作为弹性

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