基于变分模态分解的多缸柴油机缸套振动差异分析

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摘要多缸柴油机缸套振动噪声响应的差异导致缸套润滑、磨损及穴蚀现象不同，引起缸套可靠性差异并缩短整机使用寿命，研究差异的产生原因有助于柴油机的维护与设计优化。内燃机振动噪声的主要来源是燃烧冲击与活塞二阶运动引起的缸套敲击，而多缸柴油机缸套振动噪声的差异主要来源于活塞敲缸。以某重型六缸柴油机为研究对象，基于变分模态分解技术对多缸振动响应差异开展了溯源分析。建立了活塞敲缸动力学计算模型并通过试验验证了参数设置的合理性，通过变分模态分解（VMD）从振动响应中提取了主要频率成分与相关模态。结果表明：多缸柴油机各缸振动幅值分布趋势一致，缸套中上部的振动最剧烈。各缸振动差异与机体模态特性有关，缸套间振动差异与机体第7阶模态振型趋势一致，体现为第6缸振动最强，第2缸振动最弱。

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	李林涛1
	曹恒超2
	朱桂香2
	李国兴1
	刘东1
	刘培毓1
	史威威1

关键词 ：柴油机, 缸套振动, 动力学模型, 变分模态分析

Abstract：The differences in the vibration and noise response of multi-cylinder diesel engine lead to differences in liner lubrication, wear and cavitation. It causes differences in liner reliability and shortens engine lifetime. Research on these differences could help to optimise the maintenance and design of diesel engines. The main source of vibration noise in internal combustion engines is the combustion shock and piston secondary motion caused by the cylinder liner knock. The main source of cylinder liner vibration noise in multi-cylinder diesel engines is the piston knock. A heavy-duty six-cylinder diesel engine is used as the research object, and a retrospective analysis of the differences in multi-cylinder vibration response is carried out based on the variational modal decomposition(VMD). A piston dynamics model was established and the rationality of the parameter settings was verified through experiments. The main frequency components and associated modes were extracted from the vibration response by VMD. The results show that all cylinders of the multi-cylinder diesel engine have the same trend of vibration amplitude distribution, with the most intense vibration in the middle and upper part of the cylinder liner. The difference in vibration between cylinders is related to the modal characteristics of the body, and the difference in vibration between cylinder liners is consistent with the trend of the 7th order modal vibration pattern of the body, which is reflected in the strongest vibration of cylinder 6 and the weakest vibration of cylinder 2.

Key words： Diesel engine liner vibration dynamics model variational modal decomposition（VMD）

收稿日期: 2023-03-17 出版日期: 2024-02-15

引用本文:

李林涛1，曹恒超2，朱桂香2，李国兴1，刘东1，刘培毓1，史威威1. 基于变分模态分解的多缸柴油机缸套振动差异分析[J]. 振动与冲击, 2024, 43(3): 233-240.
LI Lintao1, CAO Hengchao2, ZHU Guixiang2, LI Guoxing1, LIU Dong1, LIU Peiyu1, SHI Weiwei1. Difference analysis of cylinder liner vibrations in multi-cylinder diesel engine based on variational modal decomposition. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(3): 233-240.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I3/233

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