基于动力学润滑耦合的低速二冲程船用柴油机机座刚度匹配设计研究
Stiffness design of bedplate for low speed two-stroke marine diesel engine based on dynamics and lubrication analysis
投稿时间:2019-03-05  修订日期:2019-10-26
DOI:
中文关键词:  船用柴油机  刚度  主轴承  润滑  弯振
英文关键词:marine engine  stiffness  main bearing  lubrication  bending vibration
基金项目:工信部高技术船舶科研项目(CDGC01-KT0305)
作者单位E-mail
阎心怡 上海交通大学 xy_yan@sjtu.edu.cn 
崔毅 上海交通大学 ycui@sjtu.edu.cn 
付艳 上海交通大学  
成德 中船动力研究院有限公司  
董晶瑾 中船动力研究院有限公司  
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中文摘要:
      以低速二冲程船用柴油机为研究对象建立多体动力学与弹流润滑理论耦合模型,将主轴承油膜特性、摩擦损失功耗、曲轴弯曲振动特性作为柴油机主轴承安全性与经济性的评价指标,考察机座整体结构刚度改变对主轴承润滑及曲轴振动特性的影响。研究表明:原机飞轮端第7主轴承润滑性能相对较差,整机各主轴承的最小油膜厚度偏差为79.3%。机座刚度对主轴承摩擦润滑及振动性能均有明显的且不同规律的影响。通过调整优化各主轴承座刚度,使危险位置主轴承最小油膜厚度增加7.64%,最大油膜压力降低7.83%,整机主轴承总摩擦功耗和曲轴弯曲振动幅度均有所降低。
英文摘要:
      The purpose of this work is to investigate how bedplate stiffness, partial and overall, effects the safety and economy of the low speed two-stroke marine diesel engine. Main bearings lubrication model coupled with multi-body dynamic and elasodynamic lubrication theory is established with dedicated flexible engine models developed and condensed into computable form. Main bearings’ oil film characteristics, friction loss and crankshaft’s bending vibration characteristics are used as the evaluation indexes. The results show main bearings lubrication performance vary strongly (deviation of minimum oil film thickness is 79.3%) and the 7th main bearing near flywheel end is relatively poor. By means of designing stiffness at particular positions of the bedplate can achieve evaluation indexes optimized, of which minimum oil film thickness is increased by 7.64%, maximum oil film pressure is decreased by 7.83% and friction loss and bending vibration amplitude are all decreased.
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