Dynamic Analysis Of Motorcycle Based On CAE Technology

With the improvement of living standard, more comfortable and secure motorcycle is required. The dynamic characteristic of motorcycle is always the important property explored and studied by the researchers and makers of motorcycle. In this paper, some methods to improve dynamic characteristic are put forward by studying the motorcycle.The main research in this paper includes:1) Based on CAD model of the motorcycle, an effective motorcycle finite element model including frame is built with MSC.PATRAN.2) According to the frame finite element model, the modal analysis is carried on. In order to verify the accuracy of the finite element model, the analysis result is compared with the result through the experiment. Through these results, the dynamic characteristic of the frame can be assessed simply. And then, the design variables are selected by sensitivity analysis and the minimum frame weight optimization is finished with natural frequencies as constraints.3) According to the motorcycle finite element model, the modal analysis is carried on. And then, under the motorcycle engine excitation or road random excitation, dynamics response of the motorcycle is analyzed. The effects of several factors to the motorcycle vibration are discussed in detail; the dynamics stress of several key positions of frame is studied. Through the above analysis, some important conclusions can be obtained, which can be taken as the theoretical foundation for solving actual vibration of the motorcycle. Some weak positions of the frame can be found. Combining the analysis result, some feasible improvement schemes of the structure are proposed.4) Relying on Multi-body Dynamics theory, motorcycle's Virtual Prototype is established applying MSC.ADAMS software. The future research of motorcycle dynamic characteristics is carried on with the results of the finite element analysis.Finally, the studies of the research are concluded; the further work in the recent is pointed out.