轨道结构随机振动理论及其在轨道结构减振研究中的应用

Random Vibration Theory of Railtrack Structure and it's Application in the Study of Railtrack Vibration Isolation

本文提出了两个与实际情况更为接近的轨道结构动力分析力学模型。为配合该模型选定参数,提出了一个轨道结构系统非线性物理参数识别方法。采用机械阻抗原理,给出了轮轨系统随机激振力功率谱密度函数的理论计算方法。结合轨道结构,并基于复模态分析方法,提出了非比例粘性阻尼的线性与非线性系统非平稳随机振动理论分析的数学模型。 在对结构振动与轨道部件伤损的关系分析的基础上,制定了轨道结构减振设计目标函数。采用轨道结构随机振动理论分析的方法,分别对改变轨道结构刚度、阻尼、质量等不同的方案进行了比选。依据方案比选的结果提出:采用高弹性轨下垫板进行全面减振和采用设置高弹性枕下垫板的方法对接头区重点减振的合理减振方案。

In this paper, two railtrack models for dynamic analysis are given which represent more closely the rail Situation. For selecting parameters for the models, a nonlinear physical parameter identificaton method for railtrack system is put forward. A theoretical method of the PSD of random excitation force in Wheec-rail system is advanced on the principle of mechanical impedance. Based on the railtrack structure and the complex mode analyzing method, mathematical models of nonstable random vibration theory analysis for linear and nonlinear system with non-proportional sticky damping are developed.After analyzing the relationship between structure vibration and damage of railtrack parts, the object functions of railtrack shock absorption design are formulated. The schemes of changing railtrack rigidity, damping, mass etc. are respectively discussed, by using the method of analyzing railtrack structure random vibration. From the results of comparision, a more reasonable vibration absorption Scheme is advanced.