摘要
本文中针对某商用车定置工况发动机怠速转速附近驾驶室轰鸣问题进行了仿真和实验研究。首先通过主观评价初步判定问题工况,而发动机等部位的振动和驾驶室内轰鸣噪声信号测量结果发现,怠速转速附近(810-950r/min)驾驶室存在明显的轰鸣噪声。接着利用阶次分析法和模态分析法分析可知,发动机振动经悬置传递到驾驶室引起共振,进而引发轰鸣噪声。最后通过对比优化方案,采用遗传算法对悬置进行了优化。结果表明,优化后悬置振动传递率降低了46.25%,驾驶室轰鸣噪声降低了8.79d B。
In this paper,the simulation and experimental study on the cab booming noise of a commercial vehicle under stationary condition near engine idle speed are carried out. Firstly the problematic condition is preliminarily determined using subjective evaluation,and the measurement results of the vibrations of engine and other locations and the cab booming noise signals find that there is obvious booming noise in the cab when engine works near idle speed( 810 r/min-950 r/min). Then it is revealed by order analysis and modal analysis that the vibration of engine transmits through engine mounts to the cab,causing resonance and hence booming noise. Finally based on optimization schemes comparison,the engine mounts are optimized using genetic algorithm. The results show that after optimization the vibration transmissibility of engine mounts reduces by 46. 25%,and the cab booming noise is lowers by 8. 79 d B.
出处
《汽车工程》
EI
CSCD
北大核心
2018年第2期214-220,共7页
Automotive Engineering
基金
国家自然科学基金(51205158)和中国博士后科学基金(2013M541294)资助.
关键词
轰鸣噪声
阶次分析
模态分析
悬置优化
booming noise
order analysis
modal analysis
mount optimization