Analysis Of Vertical Dynamic Response Of 360t Capacity Well-hole Wagon

The side frame is used as the main load-bearing part of the falling hole vehicle.Its structure is huge,the span is large,and the vertical bending rigidity is low.As the high speed and light weight requirements are put forward,the side frame will appear during the operation of the falling hole car.Obvious vertical elastic vibration problem.Domestic and foreign research on the dynamic response of long-haul trucks is very rare.The data obtained mainly comes from experiments and past experience.In view of this problem,this paper analyzes the vertical displacement,dynamic deflection and dynamic stress of the side frame in the simulation test direction.This thesis mainly carries on the following research work in several respects:(1)The sideframe geometry model is carefully meshed and the finite element model is obtained.The substructure technology is used to reduce the degree of freedom,and the reduced substructure is subjected to modal analysis.The other components of the falling hole car are regarded as rigid bodies,and a complete rigid-flexible coupling model is established together with the flexible side frames.Among them,the nonlinear factors were simplified,the appropriate wheel-rail relationship was determined,and the U.S.five-level spectrum was used as the wheel-rail excitation using numerical simulation techniques.The nonlinear critical speed and derailment coefficient were determined,and the falling hole model was established.A preliminary verification was conducted.(2)The dynamic simulation of the rigid-flexible coupling model of the vehicle is established.Combined with the time and frequency domain analysis,the vertical displacement,dynamic deflection and acceleration of the side frame are considered under different running speeds and different suspension parameters.(3)Using the finite element harmonic response analysis to calculate the maximum critical response that the side frame can reach in the steady state resonance.Combined with the dynamic simulation results,a preliminary judgment was made on the vibration response of the side frame during actual operation.(4)Using the transient dynamics analysis to obtain the time history of the dynamic stress of the side frame,and the distribution statistics of the dynamic stress values and frequencies.The dynamic stress changes under different vehicle speeds and different suspension stiffnesses are discussed.The current domestic and international dynamic load coefficient calculation formulas are briefly introduced,and the dynamic load coefficients are calculated using simulation data,and compared with the existing dynamic load coefficient calculation formulas.Through the above research and analysis,the analysis of the vertical dynamic response of the 360t falling hole car side frame was completed,which provided guidance for the design and improvement of the car.