| 程志伟.发动机前端异响的诊断分析和改善[J].声学技术,2018,37(2):151~156 |
| 发动机前端异响的诊断分析和改善 |
| Diagnostic analysis and improvement of abnormal noise from engine front end |
| 投稿时间：2017-05-13 修订日期：2017-07-20 |
| DOI：10.16300/j.cnki.1000-3630.2018.02.010 |
| 中文关键词: 发动机前端异响 附件皮带 正时罩 正时链条 |
| 英文关键词: abnormal noise from the engine front-end accessory belt timing cover timing chain |
| 基金项目:国家自然科学基金资助项目（11574089） |
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| 中文摘要: |
| 针对设计开发初期某发动机前端在怠速和加速工况下都存在比较严重的异响问题，通过在整机台架上对附件皮带进行近场噪声测试，结合带段频率计算和噪声频谱诊断分析，得出了附件皮带是产生怠速异响的主要原因。同时对发动机正时罩进行结构改进，减小了加速工况下正时罩这类薄壁件的共振噪声；对正时链条进行优化设计，减小了正时链系统产生的阶次噪声。实测结果表明：控制好发动机前端异响的主要途径有三个方面，附件皮带的张紧力、正时罩壳体结构表面的动刚度和正时链条系统的振动冲击作用。 |
| 英文摘要: |
| Aiming at the problem about that the abnormal noise appears at the engine front end in the idle and accelerated states,which usually happens in initial design and development stage,the near field noise measurements on full engine test bench are conducted.Through the frequency calculation of different sections of accessory belt and the diagnostic analysis of noise spectrum,it can be seen that the main factor of generating idle noise is the effect of the tension of accessory belt.Moreover,both the resonance noise generated by thin-walled structure and the order noise generated by timing chain system in the accelerated state can be reduced after improving the structural dynamic stiffness of the engine timing cover and performing the optimal design of the timing chain respectively.The experimental results show that there are three main ways to control the abnormal noise at engine front end:the tension of the accessory belt,the dynamic stiffness of the shell structure surface of timing cover and the vibration impact of the timing chain system. |
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