Finite Element Analysis And Structure Optimization Design Of Dump Truck’s Lifting Mechanism

In modern vehicle industry, the status of the CAD/CAE technology is increasingly outstanding in our country, especially in auto industry, it has been widely applied and combines a variety of methods and techniques, advancing in shortening product development cycle, reducing production cost, improving the quality of product design and the ability of meeting the demand from the customer and market. It is a kind of the important direction to improve the design quality and efficiency of the automobile products with advanced technology.This paper uses the T type lifting mechanism in a light dump truck as the object and carries on the optimization design research. First of all, it analyses the status of the structural topology optimization design both in the domestic and abroad companies; then it expounds the main theory of finite element method and the basic introduction to the basic of CAE software as well. Secondly combining motion simulation and finite element method, it creates the geometric model of the lifting mechanism and the auxiliary frame and carries on the static characteristic and dynamic characteristic analysis. Besides,multi-body analysis function based on ABAQUS is applied to determine the maximum stroke and the lifting time of the oil cylinder. In the meantime, mechanics analysis is carried on the lifting triangle to discuss the factor which affects the strength of the lifting mechanism. Lastly, according to the analysis and calculation results and it also provides the basis for structure optimization design of the lifting mechanism at the same time.Based on multi-objective topology optimization method, optimization design is carried on the lifting triangle. Firstly the basic theory of topology optimization is introduced in the paper, and then the strength, volume and hydraulic cylinder fluctuation coefficient of the lifting triangle is considered as the optimization objective function. Then according to the topological iterative results calculating, the triangle is rebuilt to meet the requirements of the practical engineering production. Lastly, performance analysis is carried on the whole lifting mechanism after topology optimization.The results show that under the condition of lightweight, the overall working performance of the new lifting mechanism is improved considerably. After the static and dynamic analysis carried on the new structure, the results finally reach the lightweight target and show that the topology optimization theory is appropriate for the structure optimization about weight or volume.