Locomotive Cooling Steel Structure Strength Analysis And Optimization

Locomotive cooling steel structure is an important part which ensure locomotive normal operation.Cooling fan.cooling fan motor is suspensed in the internal of the steel structure,the top bearing radiator and the bottom is connected by bolts with locomotive plate.Which is an important structure to ensure cooling system stability.Because of locomotive speed up constantly,in under random loads,such as vibration,incentives and shock and so on,its running becomes more and more complex during locomotive running which result in operating conditions of the boarding equipment become more severe the strength,dynamic characteristics and fatigue performance of cooling system will be affected,even affect driving safety.Therefore,it must be put forward higher request to the stability of the steel structure.This study was based on steel structure three-dimensional solid model to analyze its structural features and establish the finite element model of steel structure by HyperMesh finite element software.Because of the connection between steel structure and other cooling system components with bolts,it is different from the form of welding simulation in the finite element model.In this study,mass unit is used for simulating radiator,expansion tank,cooling fan,cooling motor,while connection is simulated by flexible element.According to the standard EN61373-2010,assessing steel strength in inertial force loads and has done modal analysis.Combined with"Mechanical Design Manual"and EN 12663-2000 standard to assess yield strength.The results show that steel local maximum Von Mises stress is greater than the allowable stress 348.48MPa,which does not meet the standards.Therefore,steel structure must be optimized and re-check.Optimization results show that the maximum von mises stress is less than the allowable stress,which meets specification requirements and steel structure first natural frequency is greater than 10Hz,which also meets the requirements.It not only improves strength of the steel structure,but also guarantee ensure its natural vibration characteristics,so as to avoid resonance phenomenon between carrying equipments and steel structure,and ensure the safety of steel structure in practical application.Therefore,the research results for locomotive cooling steel structure design provide reasonable numerical simulation basis.