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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 theoretical analysis of periodic dynamic response of steel rail, a Timoshenko beam with double-layered spring-damped support was adopted as the track’s mechanical model. The stiffness of rail cushion, the mass of sleeper, the rigidity of sleeper cushion, Rail cushion damping, damping of sleeper cushion and spacing of sleepers on dynamic response of rail points.With the decrease of rail cushion stiffness and stiffness of sleeper cushion, the vibration response of rail increases.With the increase of sleeper mass, The vibration response of the rail decreases with the decrease of the sleeper distance. The vibration response of most of the frequency bands decreases and the vibration response of the small frequency band increases. The vibration response of rail cushion damping and rail cushion damping to the rail is basically not Have an impact.