基于隔振器荷载特征的浮置板轨道定频隔振器设计研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (10) : 230-239.

论文

杜香刚1,2，朱光楠3，刘韦1,4，曹庆杰3，陈予恕3

作者信息 +

The study of designing methods for floating slab constant frequency isolator based on the load characteristics of isolator

DU Xianggang1,2,ZHU Guangnan3,LIU Wei1,4,CAO Qingjie3,CHEN Yushu3

Author information +

文章历史 +

摘要

本文旨在保证车辆在浮置板减振轨道的铺设区域具有尽可能强的行驶平稳性，基于非线性隔振理论设计了具有任意准静态载荷位置附近具有固有频率恒定特征的非线性浮置板轨道隔振器刚度曲线以及与其适配的最优化非线性阻尼曲线。首先通过对浮置板轨道用隔振器载荷特征识别，确定浮置板隔振系统的隔振需求；其次基于变质量隔振系统动态特征，设计在任意准静态载荷位置附近具有相同固有频率的定频非线性隔振系统（以下简称定频系统）刚度曲线；然后基于定频系统刚度曲线特征以及阻尼系数对非线性系统隔振性能的影响机理，对针对定频系统进行最优化非线性阻尼设计；最后基于车辆-浮置板轨道-隧道系统一体化仿真分析模型，针对最优化的定频系统进行仿真验证分析。结论表明：相比采用既有线性钢弹簧隔振器的浮置板减振轨道系统（以下简称线性系统），采用定频非线性隔振器的浮置板减振轨道系统可有效控制轨道板动态位移，轨道板动态位移可降低约8%；非线性系统可显著降低轨道板的振动加速度响应，振动加速度有效值可降低约46.24%；非线性系统在全频段都具有较好的衰减效果，Z振级插入损失约6.26dB。

Abstract

In this paper, a nonlinear floating-slab vibration isolator and its optimal nonlinear damper with constant natural frequency is proposed, based upon the nonlinear vibration theory, to ensure operating stability of the train in the laying area of the floating-slab track. Firstly, the vibration isolation requirements of the floating slab vibration isolation system are determined, through the identification of the load characteristics of the vibration isolator for the floating slab track; Secondly, the stiffness curve of constant frequency nonlinear vibration isolation system (also called constant frequency system) with the constant natural frequency near any quasi-static load position is designed, based on the dynamic characteristics of variable mass vibration isolation system; Then, the optimal nonlinear damping design for the constant frequency system is carried out, based on the characteristics of the stiffness curve of the constant frequency system and the influence mechanism of the damping coefficient on the vibration isolation performance of the nonlinear system; Finally, the optimal fixed frequency system is simulated and verified, based on the integrated simulation analysis model of vehicle floating slab track tunnel system. The theoretical study shows that, compared with traditional floating slab system which adopt linear steel spring isolator (also called linear system), the constant frequency system has a better displacement control capacity, the dynamic displacement response of the slab can be reduced by about 8%; the constant frequency system can significantly reduce the acceleration response of floating slab, vibration acceleration effective value can be reduced about 46.24%; the constant frequency system has a better vibration attenuation effect in all frequency band, vibration level (Z weighting) decreases by about 6.26 dB.

导出引用

杜香刚1,2，朱光楠3，刘韦1,4，曹庆杰3，陈予恕3. 基于隔振器荷载特征的浮置板轨道定频隔振器设计研究[J]. 振动与冲击, 2023, 42(10): 230-239

DU Xianggang1,2,ZHU Guangnan3,LIU Wei1,4,CAO Qingjie3,CHEN Yushu3. The study of designing methods for floating slab constant frequency isolator based on the load characteristics of isolator[J]. Journal of Vibration and Shock, 2023, 42(10): 230-239

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