Optimum Design Of Engineering Vehicle Body Based On Finite Element Method

Railway engineering vehicles are mainly used as engineering vehicles for routine line maintenance and emergency rescue,with the development of China's railway transportation in recent years,improving performance requirements for engineering vehicle line construction,maintenance and line rescue.On the one hand: Due to the complicated operation of rail engineering vehicles,often need to carry a lot of equipment.To make rail vehicles too conservative in order to satisfy rigidity and strength of rail vehicle,resulting in too heavy a body structure.On the other hand: Under the background of energy saving,emission reduction and lightweight,reducing body weight is very important.This article mainly studies the car body structure of the new rail engineering vehicle,establishes the car body model by carefully analyzing the car body structure drawings,uses the finite element software to analyze the car body static strength and modal,and judges whether the analysis result is satisfied based on the static strength related standards Claim.Under the condition that the car body modal and static strength satisfy the relevant standards,the rail car body structure is further optimized by lightweight design,so that the optimized car body structure meets the strength and modal requirements while reducing weight significantly.The following are the main tasks:(1)After careful study of the structure and related data of the engineering vehicle body,Reasonably simplify the car body structure,Using 3D design software SolidWorks to build geometric model.According to the TB1335-1996 standard and "Interim Regulations for Strength Design and Test Appraisal of Railway Vehicles with Speeds of 200 km / h and Above",The static strength analysis of the car body structure was carried out by referring to the static strength test method of the car body of the workshop engineering vehicle to determine nine load conditions.(2)Use the finite element software Hypermesh to build a finite element model of the car body,analyze the static strength of the car body structure under nine load conditions,and use the fourth strength theory as the standard for evaluating the static strength of the car body.The result analysis shows that the static strength of the car body conforms to the standard,but the local stress of the car body structure is high,and the cause of stress concentration is analyzed.The local structure of the car body was improved,and it was found that the stress was significantly reduced after the local structure was improved.(3)On the basis of explaining the theory of modal analysis,the finite element software is used to analyze the free modal of the car body,extract the first 10 natural frequencies and analyze the modal vibration mode.Finally,referring to the relevant standards for evaluation,itis found that the natural frequency of the car body is relatively large,which can effectively avoid resonance with the bogie.(4)After the above analysis is completed,the vehicle body is designed to be lightweight to reduce weight by 8.98%.The static strength check and modal analysis of the optimized car body structure were performed.The check found that the car body structure met the relevant requirements,indicating that the car body structure was partially improved and the lightweight design was reasonable.The improvement of the local structure of the car body and the lightweight design provide an idea for the design of the car body structure.