基于SD（smooth and discontinuous）振子几何非线性理论，根据城市轨道交通实际载荷条件和隔振需求，对钢弹簧浮置板隔振器的非线性刚度曲线及其浮置板轨道系统的动态性能进行优化设计，研发了一种浮置板用几何非线性隔振器，其同时具有良好的低频隔振性能和振动位移控制能力。对非线性隔振器进行了理论分析、结构参数设计、仿真分析及试验验证，研究表明：非线性隔振器对浮置板的振动位移具有较好的控制能力和低频隔振效果，单隔振器试验表明，相对传统的钢弹簧隔振器，非线性隔振器后浮置板的振动位移可以降低40%以上；隔振器支反力在4 Hz,6 Hz,8 Hz,11 Hz,15 Hz和20 Hz分别有3.25%,15.47%,18.77%,25.18%,31.27%和37.60%的振动衰减量。
Abstract
Based on the geometrically nonlinear theory of smooth and discontinuous (SD) oscillator, according to the actual load conditions and vibration isolation requirements of urban rail transit, nonlinear stiffness curve of steel spring floating slab isolator and dynamic performance of floating slab rail system were optimized to develop a geometrically nonlinear isolator for floating slab, it has both good low-frequency vibration isolation performance and vibration displacement control ability. Here, theoretical analysis, structural parametric design, simulation analysis and test verification of the nonlinear vibration isolator were conducted. The results showed that the nonlinear vibration isolator has better control ability and low-frequency vibration isolation effect on vibration displacement of floating slab; the single vibration isolator tests reveal compared with the traditional steel spring vibration isolator, vibration displacement of rear floating slab of the nonlinear vibration isolator can be reduced by more than 40%; at frequencies of 4 Hz, 6 Hz, 8 Hz, 11 Hz, 15 Hz and 20 Hz, vibration attenuation values of the isolator’s bearing reaction force are 3.25%, 15.47%, 18.77%, 25.18%, 31.27% and 37.60%, respectively.
关键词
SD振子 /
几何非线性 /
非线性隔振器 /
高静低动刚度 /
浮置板
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Key words
SD oscillator /
geometrically nonlinear /
nonlinear isolator /
high-static and low-dynamic stiffness /
floating slab
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