横梁接头形式优化及其在白车身性能提升上的应用

Form Optimization of Crossbeam Joints and its Application in Performance Improvement of Body in White

利用MSC/Nastran软件求解了某商用车白车身刚度及灵敏度,获得了关重模块如覆盖件、纵梁、横梁等对白车身弯扭刚度的贡献比,发现横梁模块对扭转刚度的贡献明显偏低,仅为0.79%.对比分析不同横梁接头形式对车身刚度性能的影响,并对接头形式进行了优化.结果表明:改变横梁接头形式对车身扭转刚度的影响明显大于弯曲刚度;采用分段式接头时白车身刚度性能最好;接头优化后横梁模块的扭转刚度贡献比得到了明显的提升,达到4.68%.以某相近车型为例,改进横梁及其接头形式,实现了刚度性能的提升与重量的降低,验证了接头优化对整车刚度性能提升的正确性及通用性,为横梁接头的结构优化设计和整车性能提升提供了较为可靠的理论依据.

The body in white （BIW） stiffness and sensitivity of a commercial vehicle were calculated by using MSC/Nastran software, and the contribution ratio of crucial module （such as closure panels, longitudinal beam, and crossbeam） to bending and torsion stiffness were obtained. The analysis result showed that the contribution ratio of the crossbeam module to torsion stiffness was obviously low, which was only 0.79%. The effect of the crossbeam joints form on the performance of BIW stiffness was analyzed, and the joints form was also optimized. The results showed that joints form had greater influence on torsion stiffness than that on bending stiffness, and the greatest BIW stiffness was obtained by using segmented joint. With the optimized joint form, the contribution ratio of crossbeam module to torsion stiffness increased obviously, which reached 4.68%. Taking a similar vehicle as an example, the improvement of crossbeam and joints form enhanced the stiffness performance and reduced its weight. This demonstrates the validity and generality of joints optimization to the performance improvement of vehicle stiffness, and provides a theoretical basis for the optimization design of crossbeam joints and the improvement of vehicle performance.