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    • Dynamic Characteristic Analysis and Multi- Objective Optimization Design of Piston Ring Set of A Diesel Engine
    DOI：10.13949/j.cnki.nrjgc.2023.02.010
    Key Words:diesel engine  gas blow- by  lubricating oil consumption  piston ring set parameter  orthogonal experimental design  support vector machine（SVM）  Pareto multi- objective optimization
    Author NameAffiliationE-mail
    TANG Jiatao* Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China tang@stu.kust.edu.cn 
    LEI Jilin* Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China leijilin@kust.edu.cn 
    LEI Qiming Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    DENG Xiwen Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    WEN Jun Chengdu Galaxy Power Co.， Ltd.， Chengdu 610505， China  
    JIANG Xiangsen Chengdu Galaxy Power Co.， Ltd.， Chengdu 610505， China  
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    Abstract:Taking an off- road diesel engine as the research object， combined with the measured piston temperature field， the dynamic simulation model of piston ring set was established， and the accuracy of the model was verified by the test study of gas blow- by and lubricating oil consumption. Through the analysis of orthogonal experimental design， the top ring opening gap， the second ring side clearance， and the tangential elasticity of the top ring and the second ring were selected as the decision variables. The Pareto multi- objective optimization algorithm of the support vector machine was introduced， with the optimization goal of reducing the gas blow- by and lubricating oil consumption of the diesel engine， and the K-means clustering algorithm obtained three optimization schemes. Compared with the original machine， the gas blow- by of scheme A was reduced by 3.69 L/min， with a decrease percentage of 23.50%， while the lubricating oil consumption was reduced by only 0.27 g/h. The gas blow- by and lubricating oil consumption of scheme B were reduced by 2.55 L/min and 0.49 g/h， respectively. The gas blow- by of scheme C was reduced by only 1.39 L/min， while the lubricating oil consumption was reduced by 0.44 g/h， with a decrease percentage of 12.05%. Results show that appropriately reducing the opening gap of the top ring and the side clearance of the second ring and reasonable tangential elastic force can effectively reduce the gas blow- by and lubricating oil consumption. And the optimization results can provide a theoretical basis for the design of the piston ring group of the diesel engine with high efficiency and cleanliness.
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