With the rapid development of China's economy, the international competition faced by domestic automobile manufacturers is also becoming more and more fierce. The design trend of automobile body structures is dominated by safety, fuel economy, and comfort. Therefore, the strength and stiffness of the vehicle body structure are analyzed by finite element method. , can provide the basis for structural improvement. With the development of computer technology, the finite element method is increasingly applied to the automotive industry, and manufacturers are increasingly aware of the importance of finite element analysis in the product design and manufacturing process. In this paper, the use of MSC.PATRAN for finite element analysis of a bus body structure has important implications for reducing product costs and increasing market competitiveness. The establishment of a complete vehicle finite element model Based on the CATIA geometry model, as well as the frame and vehicle structure inspected on site, a complete vehicle finite element model was established. Because the frame structure is often made up of parts with irregular cross-sections, it is difficult to fully simulate the beam elements, and the analysis accuracy is difficult to guarantee. Therefore, the shell unit is used for simulation, and the other parts of the vehicle are simulated using beam elements. The model ignores some of the decorative parts, craft pieces, skin and glass structures. Body Structure Strength Analysis, Bending Condition The full load bending condition simulates the condition of the entire vehicle running on a flat road under full load conditions to examine the strength of the body frame. Through the analysis and processing of the MSC.PATRAN software, the stress cloud diagram of the body frame beam unit under the bending condition and the stress of the frame unit under the bending condition are obtained. After analysis, under the full load bending conditions, the maximum stress occurs in the right door column, the stress size is 55.4MPa, the maximum displacement occurs at the passenger door, the displacement size is 4.25mm. Statistics, and make the pie chart to visually display the stress The proportion of bars under the level of the total number of bars. Torque conditions (single-wheel suspension condition) Full-load bending conditions are simulated when the vehicle is under full load to simulate rough roads at low speeds. This is used to check the strength of the vehicle when it is twisted. Happening.
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