Research On Vibration-Magnetic Effect Of 25CrMo4 Material

As the running speed of high-speed railway trains continues to increase,and the load capacity continues to increase,long-term operation makes the working environment of train wheels become more and more severe.When the train is running at high speed,a series of external factors such as the impact of the wheel-rail system and track irregularities cause longterm violent vibration of the train wheelset,which intensifies the dynamic force of the wheel and rail,and accelerates the fatigue accumulation and damage inside the wheelset.Which posing a safety hazard to the actual working of the train.Therefore,it is extremely important to accurately detect the failure of the train wheelset and deal with it in time to ensure the safety working of the train.Based on the metal magnetic memory detection technology,this subject conducts systematic vibration simulation and experimental research on the 25 CrMo4 alloy structural steel of the high-speed train wheel set of "Harmony",which provides important reference value in the safety detection of the train wheel set.The main study content of this paper are as follows:(1)Use SIMPACK software to model CRH3 EMU,obtain the vibration characteristics of train wheelsets under different road conditions,and provide data support for the following simulation and test analysis.(2)Through ANSYS software,the 25 CrMo4 material plate was simulated and analyzed under different vibration conditions,and the corresponding relationship between the surface magnetic memory signal of the plate and the vibration characteristics was obtained.(3)Carry out the vibration test under different working conditions on the 25 CrMo4material standard test board,analyze the magnetic signal characteristics under different vibration conditions,and compare the ANSYS simulation results.Found that the experiment coincides with the simulation.(4)With the help of ridge estimation to expand the relationship between magnetic memory signal and vibration characteristics,a mathematical model of position-vibration-magnetic field strength is constructed,and the magnetic signal distribution characteristics under arbitrary vibration characteristics are obtained.The vibration characteristics can also be deduced according to the distribution characteristics of magnetic signals.And the specific location.Through the above research conclusions,the dependability of the metal magnetic memory detection technology in the early fault detection of high-speed rail wheels is verified,and the development of this test technology in the field of rail transport security inspection is promoted.