Research On Analysis Method For Complex Mechanical System Based On Its Simplified Model

Along with the development of manufacturing technique, modern manufacturing companies set a higher demand for the performance of machine tool, which is a complex mechanism composed by many parts. In the design, the analysis results from individual parts can't fully reflect the overall performance of machine tool. Therefore, in order to make accurate prediction of the performance, the whole mechanism must be analyzed. With advantages of its own, FEA technology has become an effective method to analyze the complex mechanism.For a whole machine tool which has a large size, the scale of its FEA model is also very huge. So the finite element analysis needs lots of computing resources and time. As a result, in the analysis of the complex mechanical system, the focal point is placed on how to simplify the model reasonably without losing the important information.The focus of this research is the simplified method of the complex mechanical system, in its mode simulation. In this paper, the simplified methods of some kinds of typical parts are elaborated, such as panel/shell-parts, shaft-parts, disk-parts, cylindric parts, bearings and so on. Moreover, some familiar part features, such as holes and rib plates, are introduced. On this basis, a holistic simplified scheme which adapts to most of complex mechanisms is put forward. At last, a natural mode simulation is operated on the simplified model of the sprocket-chain box, by using the softwares including HyperMesh and Nastran.The research results in this paper are of great guiding significance for the reasonable reduction of the modal scale and the effective improvement of the working efficiency in FEA. Simultaneously, an achievable way is explored for the FEA of the complex mechanical system.