轻型客车白车身的结构改进与 NVH 性能提升  

Structural Modification and NVH Performance Improvement of the Body-in-White of a Light Bus

作　　者：陈志勇[1,2] 邬广铭[1] 史文库[1] 郭福祥[2] 桂龙明[2] 

机构地区：[1]吉林大学,汽车仿真与控制国家重点实验室,长春130022 [2]南京依维柯汽车有限公司产品工程部,南京210028

出　　处：《汽车工程》2014年第4期491-495,共5页Automotive Engineering

摘　　要：结合白车身的模态分析,利用阶次跟踪法识别出车内异常振动和噪声的产生原因为车轮转动1阶激励频率与白车身固有频率接近而引起的车身结构共振。接着对白车身进行灵敏度分析,根据前两阶固有频率对钣金件和骨架的模态频率灵敏度和质量灵敏度,提出改进方案并进行试验验证。改进前后试验结果的对比验证了改进方案的有效性与所提出方法的合理性。Order tracking method is used, combined with modal analysis of body-in-white, to identify the cause of in-car abnormal vibration and noise, that is, the resonance of car body structures due to that the 1 st order frequency of wheel rotation is close to the natural frequency of body-in-white. Then a sensitivity analysis is carried out on body-in-white, and based on the modal frequency sensibilities and mass sensibilities of first two order frequencies to sheet metal panels and skeleton, a scheme of structure modification is proposed and verified by tests. The comparison between test results before and after modification verifies the effectiveness of modification scheme and the rationality of the method proposed.

关 键 词：白车身 灵敏度分析 结构改进 振源识别 

分 类 号：U463.82[机械工程—车辆工程]