Study On Performance Of Fastening And Elevated Railway Train With Rail Corrugation

China's rail transit industry has developed rapidly in recent years.Vehicle performance parameters,operating line environment,orbit and sub-basic forms have been diversified.The interaction between rail vehicles and the lower base of the track is also extremely complicated.China's research on high-speed trains and heavy-duty freight vehicles has been deepened,and research on urban rail transit systems is still in its infancy.Based on the actual urban rail line and operating environment,the interaction response and behavior between the vehicle and the lower base of the track are studied.It is revealed that the response,load and life of key components such as vehicles and spring bars are very difficult under fault conditions.Important and of certain value and significance.The main research work has been carried out:1.Investigate the research and research results and research status of rail transit vehicle dynamics,rail wave wear diseases and elastic strip performance at home and abroad,and clarify the text research direction and main research contents.2.With the fastener spring as the research object,the accurate three-dimensional model of the elastic bar was established,and the finite element model of the elastic bar was established by using ABAQUS software.The model contains the main components of the fastener spring system,and the actual working conditions of the spring strip are simulated by the three-dimensional real contact form.The model is used to study the bolt pressure value when the elastic strip is correctly installed;the spring strip stress and its distribution after the elastic strip is correctly installed;the elastic strip buckle pressure under different mounting pressure of the elastic strip;the stiffness of the elastic strip under different installation pressure,Finally,the accuracy of the model is verified by actual measurements.Through this research and analysis,the basis for numerical simulation is provided for subsequent research.Based on multi-rigid dynamics theory,the vehicle-line-bridge coupling dynamics model is established by SIMPACK software and ABAQUS software joint simulation.The nonlinear instability rate of the vehicle and the vibration response of each component are obtained through simulation calculation.The accuracy of the model is verified by comparison with the measured parameters of the literature.4.The two main parameters of the rail wave wear are discussed in detail.The wavelength and wave depth of the wave wear affect the dynamic response of the vehicle.Through the wheel load shedding rate and the vertical and horizontal forces of the wheel and rail,the grinding depth of the grinding depth is determined under different wave grinding wavelengths.The wave grinding depth of the wave type wear should not exceed 0.2mm.The wave wavelength can be identified by analyzing the characteristic frequency of the continuous power spectral density map of the wheelset box position.At the same time,the wave depth can be identified using time domain and frequency domain statistical indicators.5.Using the dynamic load calculated by the coupled dynamics,calculate and study the spring life of the spring.The wave wavelength and depth of the wave have a very large impact on the life of the spring.When the wavelength is less than 400 mm,the life of the spring is less than 40% of the original design life.When the wave depth is greater than 0.1mm,the life of the spring is reduced to the original design.Less than 30% of life.Through the research in this paper,the dynamic response and life analysis of urban rail vehicles and fastener springs are obtained under the fault of wave grinding.The orbital grinding limit and the life expectancy of the springs are analyzed,and the maintenance of the key components for the operating units is obtained.And theoretical support for maintenance.