摘要
基于黏弹性材料动态恢复力由非线性弹性恢复力和非线性阻尼力叠加而成的理论基础,运用理论与动态试验相结合的方法,提出一种钢轨扣件减振橡胶动态恢复力模型,着重揭示一阶、三阶和五阶动刚度对激励频率和振幅的依赖性。运用最小二乘拟合法确定各阶动刚度中所含未知参数,并利用理论模型重构恢复力-位移回线,最终将其与试验曲线相比较。研究结果表明:钢轨扣件减振橡胶具有明显的非线性特性,其动态刚度与振幅和频率之间呈复杂的曲面关系;本文所建动态力学模型可为钢轨扣件减振橡胶的动态分析和优化设计提供了一定的理论支持。
A non-linear dynamic mechanical model of rubber absorber in railway fastening was proposed,which was based on a superposition of non-linear elastic restoring force and non-linear damping force.This calculation model emphasized the first-order,the third-order and the fifth-order dynamic stiffness coefficients dependence on amplitude and frequency.A procedure to determine the unknown parameters of mathematical model was also described.The calculated results finally show good agreement with the measurement results after comparative analysis.The present model should therefore be trustworthy in the field of railway fastenings rubber absorber dynamics analysis and simulation.A conclusion comes after intense and close analysis that the relationship between amplitude,frequency and the dynamic stiffness coefficients are of a complicated relative surface rather than a simplified curve.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第9期2875-2881,共7页
Journal of Central South University:Science and Technology
基金
国家科技支撑重大专项(2009BAG11B02)
关键词
钢轨扣件
减振橡胶
动态特性
动刚度
参数识别
rail fastening
rubber absorber
dynamic characteristic
dynamic stiffness
parameter identification
