Structral Research And Analysis Of MPV Body-in-white Based On Modal Testing

CAE technology, representatively FEA method, plays a more and more important role in the design of modern car products along with the development of computer technology and numerical calculation theory. Adopting the FEA technology to investigate the mechanical performance of the MPV body is prevailing in modern design of car body, which catches people's attention more and more and has great achievements in the domain domestically and oversea. Based on the investigation of the related domestic and overseas research in this field, the finite element model of a MPV body-in-white is established, static stiffness and modal analysis were carried on. Accordingly the static stiffness and modal testing had been finished. Results comparison between the testing and analysis revealed the structral capabilites and verified the finite model's correctness. In this paper, the establishment principle of mode experiment model and establishment method of test system was illuminated trough studying the body-in-white of a MPV. And mode parameter identification was carried out to the data connected. Configuration dynamic feature of this white body was seized. The bending, torsion and mode experiments of this white body were carried on. And the theory analysis was verified to make sure the accuracy of the theory analysis.In this paper, the analysis of experiment results indicated that the establishment of the test system met the demand of precision and the result of parameter identification was efficient and credible. This was very useful for the sensitivity analysis and structure dynamical updating.