Strength Research And Structure Design Of Heavy-Haul Electric Locomotive Car-Body

With the rapid development of national economy, railway transportation has already cannot meet the requirement. Therefore, it is necessary to develop heavy haul transport. The research of high-power and heavy-haul locomotive becomes the primary topic.The high-power and heavy-haul locomotive can effectively improve the train traction effort and achieve heavy-haul traction by increasing the axle load or the number of axes, adopting AC power technology and high-power asynchronous motor. The longitudinal force heavy-haul locomotive bears is much larger than the normal locomotive, so the car-body steel structure needs to be designed reasonably to making full use of material properties.In this article, the research and analysis of the existing heavy-haul locomotive body structures have been performed, besides, the demonstration analysis and design optimization for design principle of car-body main bearing components structural have been focused on, putting forward car-body structure design methods; combined with the design of the main components, the analysis of the welded joint design has been given, bringing forward rational design of weld position and form of welded joints. On the basis of this, the holistic bearing car-body has been adopted for a certain type of heavy-duty electric locomotive car-body, which is welded by cab, sidewalls, underframe and other components; the front-end of the car-body is the cab, and the other end is the tail wall. The car-body roof uses small knock-down roof structure, and the cab adopts multi-planar and micro streamlined structure; the car-body has central corridor, the underframe adopts run-through center longeron type main load-bearing structure, which is composed of main cross girder, head stock, and transformer beam, and the traction type uses both ends of traction, ln order to improve the strength and torsional rigidity of the entire structure of the car-body, grid structure with tilt winding has been used for the sidewall.According to EN12663-1, combined with the use of existing domestic locomotive, the main load of the heavy-haul locomotive body has been determined, and on this basis, car-body static strength calculation load cases and fatigue load conditions are developed. After that, static strength and fatigue strength assessment have been performed according to EN12663-1and DVS1612. By using the finite element model of the body structure established in ANSYS, calculated static strength and fatigue strength of the body structure. And visualized the static strength and fatigue strength result of car-body with the secondary development language(APDL) of ANSYS, the calculation results showing that the static strength and fatigue strength of the locomotive body structure meet the requirements, and the structural design being reasonable.