| During the running of the train,the wheels and rails will produce i MPact,which will cause vibration shock and noise.Vibration will spread between tracks,tunnels,and ground structures,which will cause corresponding vibration to the surrounding environment,and also cause very adverse effects.In order to reduce the vibration and noise generated by urban rail transit to the surrounding environment,vibration reduction and noise reduction measures to control vibration noise appear to be very important.At present,a variety of rail vibration damping measures and equipment have been applied to urban rail transit.Among them,rail vibration damping fasteners are simple and practical,with obvious vibration and noise reduction effects,low cost,and simple construction.A series of rail fastener products with vibration reduction and noise reduction functions have been introduced on the market.Among the many vibration reduction fastener products,the detachable double-layer vibration reduction fastener achieves two-layer elastic body vibration reduction to achieve higher.The vibration damping effect can be easily dismantled and replaced,so it has received a lot of applications and is favored by the market.However,at present,such products in China have problems such as high cost,easy failure of embedded cannula,and high installation height.Based on the current status of domestic research on medium vibration damping fasteners,and based on the design concept of a double-layer non-linear vibration damping fastener,a new model of medium vibration damping fasteners is designed.The finite element analysis software was used to analyze the strength of the pull-out force and lateral force resistance of the load-bearing studs,embedded bushings,anchor bolts,and insulation glands in the main components of the new medium-damped fasteners.The free modal and constrained modal analysis of the load-bearing spin column in the new medium-damped fastener is carried out,and the vertical static stiffness of the entire fastener system is simulated.On this basis,in order to reduce costs,the size structure of the new type of fasteners is improved.The dimensions of the outer boss,height,hole depth,and hole inner diameter of the upper boss of the new type of load-bearing spinner were studied as factors,and the trend of the lateral force resistance under different sizes was analyzed.In order to study the factors that affect the stiffness of the new type of fasteners,the thickness of the rubber pad of the new type of fasteners,the cone angle of the convex circular table,and the diameter of the convex circular table are studied,and the change trend of the stiffness with the size of the rubber cushion is obtained.The optimization of fasteners provides a theoretical basis. |
