Study On The Lightweight Of Electic Locomotive Car Body Based On Hyperworks

Because the modern main line of locomotive power gradually increased, weight is gradually increasing, and the locomotive weight directly affects the running speed of railway vehicles. To lighten the vehicle weight can reduce the raw material cost, effectively improve the running speed of vehicles, reduce vibration and noise, prolong the service life of the vehicle and the track, save the transportation cost. The locomotive body is the main body of the whole locomotive, and the main part of the whole locomotive to lighten, the lightweight study is very necessary. Locomotive from production to scrap, the various parts of the body are subject to loads from different degrees and different direction, so ensuring the body with enough strength and rigidity is the premise of the design of body lightweight.Base on the above background, the purpose of this paper to choose a suitable platform and method for the optimization of locomotive car-body, through the reasonable optimization design of electric locomotive, reach the purpose of lightweight car body.Firstly, we compare the adaptive response surface method in the HyperStudy and feasible direction method in the OptiStruct through a locomotive underframe structure to lighten example, and compared the characteristics of two kinds of optimization methods. The results show that when there are too many design variables and constraints, the feasible direction method in the OptiStruct needs fewer iteration times and lightweight effect is more apparent, and be suitable for using in the large complex structures as locomotive body. Then, checking the strength of an electric power locomotive body found that although the vehicle stress meet the requirements, the stress of the local structure has great redundancy to design and a larger lightweight space. Based on the vibration mode theory and finite element method to study the removable roof structure the influence of stress, deformation and the first order vertical bending frequency for vehicle body. The results show that, from the perspective of stress, removable roof structure has a great influence on the local installation interface part and a little influence on the whole vehicle body; From the perspective of vertical deformation, removable roof of the vehicle has a little influence on deformation; From the perspective of modal, the first order vertical bending frequency of no roof structure is smaller than the first order vertical bending frequency of the original structure 0.38 Hz, but removable roof structure has great influence on the first-order torsional frequency. Finally, a removable roof is connected to the side wall of the up cantilever as a concentrate mass. The final design variables are determined by sensitivity analysis. This paper establishes the reasonable optimization model of body structure to optimize, and checks the optimized vehicle body structure strength and modal. Optimization results show that the total weight of vehicle body decreased from 26.854 t to 21.604 t, lightweight effect is obvious. According to the results of stress, the optimized body can satisfy the requirement of strength, and the optimized body first-order vertical bending natural frequency is 9.937 Hz, which can satisfy the body modal requirements.The studies in this paper show that select the appropriate platform and optimization method can effectively achieve the locomotive car body lightweight design, while ensuring optimized body structure to meet the strength and stiffness requirements.