基于焊点参数识别的白车身动态特性

BIW dynamic characteristics based on spot-welding parameter identification

推导了焊点质量、刚度矩阵修改与白车身结构动态特性之间的关系,以试验频率与振型为目标,对白车身类板壳点焊结构焊点参数进行识别,提出了利用参数识别的弹塑性梁单元方法对点焊结构进行模拟。与弹塑性梁单元焊点建模方法在动态特性分析方面进行了对比,并应用于实车白车身动态特性仿真进一步验证仿真精度。结果表明,参数识别的弹塑性梁单元焊点建模方法提高了板壳类结构动态特性分析的仿真精度,为点焊的数值模拟仿真提供了一种研究方法。

The relationship between the modifications of spot-welding mass matrices or rigidity matrices and Body in White(BIW)structural dynamic characteristics is investigated.First,the spot-welding parameters of shell structures in BIW are identified in order to describe the actual structural frequencies and vibration mode. Then,the method of Elastic-Plastic Beam with Parameter Identification(EPBPI)is employed to simulate spot-welding.Finally,the EPBPI method is compared with the universal method of elastic-plastic beam spot-welding in dynamic characteristic analysis,and it is applied to simulate of the dynamic characteristics of a real BIW to further validate the simulation accuracy.Results show that the EPBPI spot-welding simulation method can improve the accuracy of dynamic characteristic simulation of shell structure and provide a research method for spot-welding numerical simulation.