Design method of nonlinear vibration isolator based on isolator load characteristics
DU Xianggang1,2
1.Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd., Beijing 100081, China;
2.State key Lab for Track Technology of High-speed Railway, Beijing 100081, China
Abstract:Based on nonlinear vibration theory, a nonlinear vibration isolator designing method based on load characteristics of isolator is proposed. Specifically include the followings: train-track-tunnel coupling dynamic system modeling, identification of vibration isolators loads of floating slab track, isolator nonlinear stiffness optimization design, isolator nonlinear damping optimization design and system simulation of the nonlinear vibration reduction floating slab track. 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, 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 20%; the nonlinear system can significantly reduce the acceleration response of floating slab, vibration acceleration effective value can be reduced about 62%; the nonlinear system has a better vibration attenuation effect in all frequency band, vibration level (Z weighting) decreases by about 3 dB, in the lower frequency band (≤20Hz), the maximum frequency division level insertion loss is about 12dB compared to linear system.
杜香刚1,2. 基于隔振器荷载特征的非线性隔振器设计方法研究[J]. 振动与冲击, 2021, 40(21): 290-297.
DU Xianggang1,2. Design method of nonlinear vibration isolator based on isolator load characteristics. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(21): 290-297.
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