船舶柴油机柔性曲轴与机体EHD耦合下振动研究  

Vibrations of the flexible crankshaft and block of a marine diesel engine under EHD coupling

作　　者：魏立队[1] 魏海军[1] 段树林[2] 李精明[1] 杨智远[1] 刘竑[1] 

机构地区：[1]上海海事大学商船学院,上海201306 [2]大连海事大学轮机工程学院,辽宁大连116026

出　　处：《哈尔滨工程大学学报》2017年第2期181-188,共8页Journal of Harbin Engineering University

基　　金：国家高技术研究发展计划(2013AA040203)

摘　　要：为同时、准确、快速地获得船舶柴油机曲轴和机体的整体振动形态,运用模态综合法对其动态缩减,建立二者EHD耦合下的计入各非线性因素的缩减的系统动力方程,采用Newmark方法数值求解。二者间的EHD耦合则根据Reynolds方程和Greenwood/Tripp微凸峰接触理论,采用有限体积法计算获得。由此建立大型船舶柴油机柔性曲轴与柔性机体耦合下的整体振动计算模型,并通过与经典方法对比、试验测试验证了该建模方法和模型。基于该模型,能够同时快速较为准确地计算柔性曲轴和柔性机体的整体的三维振动形貌,有利于进一步揭示曲轴和机体的振动机理,为曲轴和机体优化设计提供依据。In order to obtain the overall vibration of the crankshaft and engine block of a marine diesel engine sim-ultaneously , accurately,and quickly,after dynamic reducing them with a component mode synthesis method, non-linear condensed system dynamic equations were built where they were coupled each other with EHD （elasto-hy- drodynamic lubrication） mode,and were solved numerically by Newmark method. According to the Reynolds equa-tion and Greenwoo^^^Tripp asperity theory,EHD coupling could be calculated by the finite volume method. A vibra-tion model of the crankshaft and block was set up under coupling conditions and verified by comparison with classic models and experimental results. Based on the developed model,the three-dimensional vibration performance of the flexible crankshaft and block could be easily calculated to reveal the relevant mechanism and support efforts to opti-mize marine diesel engine designs.

关 键 词：船舶柴油机 柔性机体 柔性曲轴 EHD耦合 整体振动 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]