基于功率流方法的再生复合轨枕减振机理研究

Research on Vibration Reduction Mechanism of Cyclic Composite Sleeper Based on Power Flow Method

复合轨枕通过自身的弹性变形,从轨枕本身增加了轨道结构弹性,为研究复合轨枕的减振机理,本文首先说明复合轨枕变形特点,并测试其相关参数,通过建立力学模型,基于功率流方法,揭示复合轨枕减振机理,复合轨枕功率流垂向分布特性。研究表明:压缩弹性模量是影响复合轨枕减振性能的关键参数,经测试可知其压缩弹性模量平均值为900 MPa,损耗因子为0.093;复合轨枕振动过程中内部消耗的能量大于Ⅲ型混凝土轨枕,减小向下传递的功率流,减小了道床的振动;复合轨枕承轨槽处振动较大,应引起重视;从轨道结构振动能量角度考虑,建议再生复合轨枕弹性模量取值为900~1500 MPa。

The composite sleeper increases the elasticity of the track structure through its own elastic deformation.In order to study the vibration reduction mechanism of the composite sleeper,the deformation characteristics of the composite sleeper were explained and its related parameters were tested.A mechanical model was established and the power flow method was used to reveal the vibration reduction mechanism of the composite sleeper,and the vertical distribution of the power flow of the composite sleeper.The results show that the compressive elastic modulus is a key parameter that affects the vibration damping performance of the composite sleeper.The average value of the compressive elastic modulus is 900 MPa with the loss factor of 0.093.The energy consumed during the vibration of the the composite sleeper is greater than that of typeⅢconcrete sleeper,which reduces the transmitted power flow and the vibration of the track bed.The vibration at the rail seat of the composite sleeper is relatively large and should receive attention.Considering the vibration energy of the track structure,the elastic modulus of the composite sleeper is recommended to be 900~1500 MPa.