Analysis of influence of piston secondary motion on vibration and noise of non-road high pressure common rail diesel engine

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (11) : 193-200.

WU Limin1, BI Yuhua1, WU Biao1, LEI Jilin1, SHEN Lizhong1, LIU Kang2

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Abstract

Piston slap is the main vibration and noise source of diesel engine. The main reason is that the piston performs the second-order movement of the lateral and yaw in the gap between the piston and the cylinder liner. The influence of the piston design parameters on the second-order movement of the piston is researched, and the piston dynamics is optimized. The optimization of the piston dynamics characteristic is of great significance for engine vibration and noise reduction. Taking the off-road four-cylinder high-pressure common rail diesel engine as the research object, the piston dynamics calculation model and the multi-body dynamics calculation model of the whole engine are established. The accuracy of the finite element model is verified by the modal test of the body and crankshaft. The analysis method is used to study the influence of the piston pin offset, the position skirt profile, the clearance between the piston and cylinder,which are the three main factors influencing on the dynamics and the vibration of the whole engine. The research results show that the clearance between the piston and cylinder has the greatest influence on kinetic energy of piston, the piston impact force and the moment due to contact force of piston; sensitivity analysis of engine vibration and noise shows that the piston pin offset is a key factor affecting engine vibration and noise performance.

Key words

diesel engine;orthogonal design method / Piston design parameters;vibration and noise / Sensitivity

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WU Limin1, BI Yuhua1, WU Biao1, LEI Jilin1, SHEN Lizhong1, LIU Kang2. Analysis of influence of piston secondary motion on vibration and noise of non-road high pressure common rail diesel engine[J]. Journal of Vibration and Shock, 2020, 39(11): 193-200

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