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
1.Railway Engineering Research Institution, China Academy of Railway Sciences Corporation Limited, Beijing 100081,China；
2.State Key Laboratory for Track Technology of High-Speed Railway, Beijing 100081,China；
3.School of Astronautics, Harbin Institute of Technology, Harbin 150001, China；
4.Zhuzhou Times New Material Technology Co., Ltd., Zhuzhou 412007, China
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.
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. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(10): 230-239.
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