Line vibration tests and load spectrum induction of traction converter of electric locomotive
LIU Wei1,2, ZHU Guangnan3, DU Xianggang1,4, XIAO Junheng5,6, YANG Jun2, JIANG Cheng1,4
1.Railway Engineering Research Institution, China Academy of Railway Sciences Corporation Limited, Beijing 100081， China；
2. Zhuzhou Times New Material Technology Co., Ltd., Zhuzhou 412007， China;
3. School of Astronautics, Harbin Institute of Technology, Harbin 150001，China；
4. State key Laboratory for Track Technology of High-speed Railway, Beijing 100081， China；
5. Department of Mechanical Engineering, Tsinghua University, Beijing 100084， China；
6. Beijing Tieke Shougang Railway-Tech Co., Ltd., Beijing 102206， China
Abstract：Based on the study of floating slab isolator loads characteristics, the isolator optimal design objective is proposed, and accoding to nonlinear vibration theory, a nonlinear stiffness curve with high-static-low-dynamic is designed and its static and dynamic characteristics are analyzed. Aiming at the defects of the designed nonlinear stiffness curve, an optimal damping curve is proposed, aiming at further improved its vibration isolation effects. By nonlinear designing of the stiffness and damping parameters, the vibration isolator floating slab system has both lower frequency vibration isolation and displacement inhibition capacity. The theoretical study shows that, the nonlinear isolator has a lower principal resonant frequency and a lower resonant peak compared with linear isolator; compared with traditional floating slab system which adopt linear steel spring isolator (also called linear system), the floating slab system which adopt nonlinear isolator (also called nonlinear system) has a better displacement control capacity, the dynamic displacement response of the slab can be reduced by about 50%; the nonlinear system can significantly reduce the acceleration response of floating slab, vibration acceleration effective value can be reduced about 46%; the nonlinear system has a better vibration attenuation effect in the lower frequency band (≤20Hz), the maximum frequency division level insertion loss is about 11.83dB compared to linear system at about 10Hz.
Key words: High-static-low-dynamic stiffness; nonlinear vibration isolation; nonlinear stiffness; nonlinear damping; floating slab track; lower frequency vibration; dynamic displacement
刘韦1，2，朱光楠3，杜香刚1,4，肖俊恒5,6，杨军2,江成1,4. 基于轮轨载荷特征的浮置板高静低动非线性刚度隔振器设计方法研究[J]. 振动与冲击, 2022, 41(15): 1-10.
LIU Wei1,2, ZHU Guangnan3, DU Xianggang1,4, XIAO Junheng5,6, YANG Jun2, JIANG Cheng1,4. Line vibration tests and load spectrum induction of traction converter of electric locomotive. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(15): 1-10.
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