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

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (3) : 233-240.

LI Lintao1, CAO Hengchao2, ZHU Guixiang2, LI Guoxing1, LIU Dong1, LIU Peiyu1, SHI Weiwei1

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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.

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Diesel engine / liner vibration / dynamics model / variational modal decomposition（VMD）

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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[J]. Journal of Vibration and Shock, 2024, 43(3): 233-240

References

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