Parameter Optimization And Failure Analysis Of The Suspension System Of DGTC80? Rail Flaw Detection Vehicle

Rail is an important part of railway line,which is used to guide the wheels of railway vehicle to advance,bears the huge pressure of the wheels,and transfer it to the sleeper.Railhead internal transverse fatigue crack(commonly known as nuclear injury)has caused a lot of rail accidents.Rail flaw detection vehicle,as a professional equipment of rail flaw detection,can find the rail internal defects.The flaw detection equipment is installed on the rail flaw detection vehicle,and the running stability of the flaw detection vehicle directly affects the flaw detection rate.Improving the riding smoothness of the flaw detection vehicle,we must start with dynamics.To improve the design quality and reduce the risk of design,it is necessary to carry out the dynamics simulation of rail flaw detection vehicle.This paper introduced the composition,function and characteristic of the bogie and explained the bogies of the DGTC80? rail flaw detection car.By introducing the orbital disturbance and track spectrum and according to the simplification principle of vehicle dynamic model,simplistically treat the model of DGTC80? rail flaw detection car and build its SIMPACK simulation model.The dynamic model of DGTC80? rail flaw detection car mainly includes car body,two frames,four wheel set and eight axle boxes and so on.It introduces the evaluation standard and calculation principle of vehicle dynamics performance,the analysis method of vehicle critical speed,the calculation method of the stability index when vehicle is on straight line,and the calculation method of safety index when the vehicle passes curve.Through the model to conduct the simulative analysis of DGTC80? rail flaw detection vehicle,obtain the nonlinear critical speed,the stability index of different speeds,and the safety index when passing different curves.By optimizing the longitudinal positioning stiffness,the lateral positioning stiffness and spring vertical stiffness of the axle box,the damping coefficient of the first vertical vibration damper,the vertical stiffness and lateral stiffness of the second suspension spring,and the damping coefficient of the anti-snake vibration damper,the optimized suspension parameters are obtained.Finally,conduct the analysis&calculation of the dynamic performance of the secondary lateral vibration damper under failure condition,the dynamic performance of the metro vehicle system when the equivalent slope of tread is 0.35 and the curve passing safety when the adhesion coefficient of wheel-rail is 0.5,which verifies the rationality and safety of the design.