Difference analysis of cylinder liner vibrations in multi-cylinder diesel engine based on variational modal decomposition

被引：0
|
作者：
Li L. [1 ]
Cao H. [2 ]
Zhu G. [2 ]
Li G. [1 ]
Liu D. [1 ]
Liu P. [1 ]
Shi W. [1 ]
机构：
[1] Vechicle Engineering Department, Taiyuan University of Technology, Taiyuan
[2] Weichai Power Co., Ltd., Weifang
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 03期
关键词：
decomposition (VMD); diesel engine; dynamic model; liner vibration; variational modal;
D O I：
10.13465/j.cnki.jvs.2024.03.028
中图分类号：
学科分类号：
摘要：
Differences in vibration and noise responses of cylinder liners in multi-cylinder diesel engines cause different lubrication, wear and pitting phenomena to lead to differences in cylinder liner reliability and shortening the overall service life. Studying reasons of differences is conducive to maintaining and design optimization of diesel engines. Main sources of internal combustion engine vibration noise are combustion shock and cylinder liner knocking caused by second-order piston motion, while differences in cylinder liner vibration noise in multi-cylinder diesel engines mainly come from piston knocking. Here, taking a heavy-duty 6-cylinder diesel engine as the study object, traceability analysis was performed for differences in multi-cylinder vibration responses based on variational modal decomposition (VMD) technique. Dynamic calculation model for piston knocking was established and the rationality of parametric setting was verified through tests. Main frequency components and related modes were extracted from vibration responses with VMD. The results showed that distribution trend of vibration amplitude in each cylinder of a multi-cylinder diesel engine is consistent, vibrations in middle and upper parts of cylinder liners are the most severe; vibration differences in various cylinders are related to modal characteristics of engine body, vibration differences in cylinder liners and the 7th order modal shape of engine body have consistent trend; vibration of the 6th cylinder is the strongest, vibration of the 2nd cylinder is the weakest. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：233 / 240
页数：7
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