摘要
柴油皮卡4档75%以上油门加速或3~5档匀速行驶,当发动机转速为1400~1500 r/min时,车内存在较明显轰鸣声。利用传递路径分析法建立NVH传导模型,并运用CAE辅助找到故障产生原因,结果表明,后桥激励导致货箱前围板和乘员舱后围板共振产生轰鸣。通过补焊型材改变货箱前围板模态避免共振,通过贴阻尼垫减少乘员舱后围板振幅,并增加隔音棉,有效解决了轰鸣带来的影响。
When a diesel pickup truck was on over 75%acceleration under the fourth gear or moved at a constant speed under the 3-5th gear,there was an obvious roaring sound inside it with the engine speed reaching the range of 1400~1500 r/min.The NVH conduction model was established by transfer path analysis method and CAE was used to help find the cause of the fault.It was found that the rear axle excitation caused the resonance roaring of the front coaming of the container and the rear coaming of the crew compartment.The modal of the front coaming of the container was changed by welding section bar to avoid resonance.The amplitude of the rear coaming of the crew compartment was reduced by attaching damping pad,and sound insulation cotton was added.These measures can effectively deal with the impact of the roar.
作者
白杨
徐登洲
李艳明
BAI Yang;XU Deng-zhou;LI Yan-ming(Jiangling Motors Co.,Ltd.,Nanchang 330001,China;Nanchang Yihui Plastics Industry Co.,Ltd.,Nanchang 330096,China)
出处
《失效分析与预防》
2020年第6期398-403,共6页
Failure Analysis and Prevention
关键词
轰鸣
共振
模态
传递路径分析法
激励
roar
resonance
modal
transfer path analysis
excitation
