Virtual Simulation Research Of The Structural System Of Wheel Loader

Wheel loader is a kind of construction machinery used to load material to transport equipment, which always worked in the large-scale construction sites or open mine. The working location is always capricious and the working environment is terrible and the structural system itself is comparatively complex. So it can be easily damaged. The structural system of wheel loader is the major loaded members, including working device, front frame, rear frame and auxiliary frame. Currently, virtual simulation research of the structure system of wheel loader, mainly in the multi-body dynamics analysis on working device and finite element analysis on the key components. Both of them is individually analyzed. Based on the theory of multi-body dynamics and finite element, kinematics, dynamics and finite element analysis were done in this paper, by means of Pro/E, ANSYS and ADAMS. The structure of the key components was improved based on the results of the virtual simulation. This paper provides a basis for theoretical research and new product development of wheel loader.Firstly, the basic theory used in this paper was introduced. On the basis of describes the virtual prototyping technology, digitized functional prototype and dynamic simulation of mechanical systems was introduced. The theory of joint virtual simulation technology and rigid-flexible coupling dynamics was elaborated, and the data interface of Pro/E, ANSYS and ADAMS was introduced. Secondly, work process of wheel loader was analyzed and a typical work cycle was gained. The method of generating the flexible body, the process of redundant constraint, the definition of driven, and the application of load was researched. The building process of rigid-flexible virtual prototype was elaborated, and the maximum uninstall height and corresponding uninstall distance, the rotation angle of bucket, the transmission angle of linkage, and the power gain of revolving mechanism was obtained from the kinematic simulation of structure system. The dynamic performance of the bucket and arm was analyzed emphatically. The course curve of major loaded hinge point was obtained in the two working conditions being load-midst and load-bias from the dynamics simulation. The results of kinematic simulation used to provide guidance for the design, and the results of dynamic simulation used to provide rest for the analysis of working conditions and the application of load. The most dangerous conditions of the major loaded members were discussed based on the results of multi-body dynamics analysis. The key technologies of finite element modeling were introduced, including selection of unit, mesh, application of constraints and loads. Static analysis of key parts were done based on the most dangerous conditions, and the results provide a basis for structural improvements. Last, Irrational structures identified in the virtual simulation results were improved. The improved structure is significantly better than the former structure. The more reliable design was obtained.In this paper the virtual prototype of the structural system of wheel loader was established using the method of combination of multi-body dynamics and finite element. And kinematic and dynamic analysis were done. Its results provide a basis for the analysis of working conditions and the application of load. Finite element analysis of the key components were done and its results provide a basis for structural improvements. Irrational structures identified in the virtual simulation results were improved. Closed-loop research ideas was formed. This paper provides a reference for virtual simulation and structural improvements of construction machinery.