Structure Strength Analysis And Optimal Design For The Housing Of Automotive Gearbox

With the rapid development of automobile industry and the increasingly serious energy problems, energy saving and emission reduction in the automotive industry is get more and more attention. Vehicle Lighting is one of the most important ways to achieve energy saving, so the vehicle lighting has a great value and practical significance.This paper make a study on "load spectrum based on topology optimization of automobile transmission box integration technology research and product development" ,which project is supported by Science and Technology Bureau of Changchun City, for the issues of the quality of a light truck transmission box is too large, uneven distribution of structural stress and so on .So we focuses on the transmission box's structure strength in the condition of static and dynamic loading, and based on the result of structural strength analysis of the box made a topology optimization ,and achieving the purpose of the gearbox lightweight .In the first part of this thesis, a brief description of the vehicle lightweight structural optimization research status of the home and abroad and the knowledge of design theory is presented .On the basis of that proposed the finite element analysis and dynamic simulation technology combined design ideas. Using the finite element analysis software HyperMesh for modeling the gearbox and impose the proper boundary conditions. On this basis, the calculation of the transmission box modal analysis and experimental validation, the results showed that the eight-order mode shape is consistent, and the consistent mode's relative error is less than 5%, verifying the model of transmission box is reasonable.Then, analyzed the structural strength of the model and study the cabinet stress distribution under static and dynamic load. Taking into account the conditions I file and reverse file gear box stalls and suffered the maximum load, so only made mechanical analysis to these two conditions. On this basis, the analysis of dynamic load of the box excited by the structural strength, using the combined methods of finite element structural analysis and dynamics simulation, make use of ADAMS / Car and Hyper Mesh software to establish a flexible coupling dynamics model of a light goods vehicle, progressed the dynamic simulation analysis, collecting load spectrum at the connection point to the gear box. Using ABAQUS software simplified the load spectrum and acting on the box corresponding position, implemented the dynamic load analysis of structural strength.Finally, the design of topology optimization is based on the results of the strength analysis. In the case of ensuring that improved structural performance has little difference between the original one, the topology optimization using density method defines the material flow pattern, and selecting the each density cell of the gear box finite element model as the design variable. It takes the quality of the box as objective function and constraints the displacement of the shaft. Optimization results show when the stiffness of the box keep constant and strength and vibration keep the same the quality of transmission box reduces 8% after improved. That meets the requirements.In this paper by using finite element analysis and simulation tools, in the finite element modeling and experimental verification, based on the dynamic load is established based on analysis of the structural stiffness and strength processes, the use of topology optimization method, carried out using a lightweight structure for the purpose of optimizing design. In the product design and development stage, achieved the prediction for cabinet and other key components of the transmission structure optimization design and the structure under dynamic loading stiffness and strength, designed to improve the transmission of technical maturity, shortening the product development cycle.