Application And Study On CAE For Working Equipment Of Hydraulic Excavator

As important engineering machine, hydraulic excavator is widely used in earthwork construction and mine exploitation. Because of complicated and varied loads, reliability of production is concerned. In tradition, designers assumed several probable dangerous poses according to experience, and then analyzed strength of production manually. But this approach is not fit for requirement of development and design of production again. Nowadays, with rapid development in computer technology, Computer Aided Engineering (CAE) technology is more perfect and efficient. CAE is replacing status of traditional method and become the most important approach in development and design of production.In this dissertation, the author uses CAE simulation technology to ascertain the most dangerous pose of hydraulic excavator's working equipment by means of parameterization analysis approach, and then calculate structure strength. Compared with traditional method, this approach gains more accurate results. It benefits rationality of structure design. The content of dissertation can be summarized as follow.At first, the dissertations presents basic theory of the Virtual Prototype and the Finite Element Analysis, and the significance and development of VP and FEA technology in China and aboard are also related in this part.Then, completing computer simulation among the several platforms through general interface technology.Using modeling software UG to create three-dimensional model of excavator's working equipment.In general dynamics simulation software ADAMS, parameterzing the excavator model. During simulation, using cylinders length to create variables, creating relation of digging resistive force and digging poses, driving model, and then ascertaining the most dangerous pose from the work field, acquiring load of each joint. After comparison with traditional method, the simulation is proved more accurate to locate dangerous pose.Finally, in finite element analysis software MSC.PATRAN/NASTRAN, creatingloads/boundary constraints of boom and arm according to simulation results from ADAMS, and then completing FEA of them. The final results indicate that structure design is secure and reliable.