车辆地板异常振动的原因分析与改进

Abnormal Vibration Analysis and Improvement of Vehicle Floor

针对某新研发车型出现的地板异常振动问题,文章阐述了燃油管路中燃油的脉冲激励原理。结合局部模态控制方法,运用仿真分析手段和道路振动采集分析法逐一排查问题,从传递路径及响应角度提出三个改善方案,分别为燃油管路增加柔性壁、燃油管夹采取隔振措施及地板添加支撑梁,旨在降低燃油脉冲激励引起的强迫振动和地板局部模态引起的共振。优化方案合并实施后地板振动幅值下降一倍,问题频率段内地板振动能量明显减弱,主观评价振感消失。

The question was raised as vibration amplitude of floor panel in the new car research and development. This paper introduces the principle of fuel impulse excitation in fuel pipeline. Problems were inspected by computer simulation analysis and interior vibration test on road, with control methods of localized mode, in order to reduce the forced vibration of fuel oil impulse excitation and resonance caused by localized mode of floor panel. Three relevant optimizing solutions were put forward and carried out, namely adding rubber tube to fuel pipeline, using vibration isolation at fuel line clamp and augmenting support beam on floor panel. The test result showed that the amplitude of floor was decreased by approximately 50%, simultaneously the vibrational energy apparently was less in the corresponding frequency band, and subjective appraisal was that the vibration disappeared.