轨下基础参数对钢轨动力响应的影响

Effect Analysis of Sub-Rail Parameter to the Dynamic Response of Rail

以钢轨动力响应周期解析法为理论基础,采用双层弹簧阻尼支承的Timoshenko梁为轨道的力学模型,从时域和频域两方面计算分析了钢轨垫层刚度、轨枕质量、轨枕垫层刚度、钢轨垫层阻尼、轨枕垫层阻尼及轨枕间距对钢轨点动力响应的影响.随着钢轨垫层刚度和轨枕垫层刚度的减小,钢轨的振动响应增大;随着轨枕质量的增大,钢轨的振动响应减小;随着轨枕间距的减小,大部分频段内的振动响应减小,小频段内的振动响应值增加;钢轨垫层阻尼、轨枕垫层阻尼对钢轨的振动响应基本不产生影响.

Based on the periodicity analysis to the dynamic response of rail, a two layers periodic supported Timoshenko beam is adopted as the model of the rail. In time and frequency domain, the effect of sub-rail parameters to the dynamic response of rail are given out and analyzed. With the decrease of the railpad stiffness and sleeperpad stiffness, the dynamic response of the rail increases; with the increase of the sleeper mass, the dynamic response of the rail decreases; with the decrease of the sleeper space distance, the dynamic response of the rail decreases in large scale frequency; and the railpad damp and sleeper damp have no effect on the dynamic response.