摘要
曲轴的扭振严重影响发动机寿命及NVH性能,目前,工程上普遍采用单一的集总参数法对曲轴进行扭振分析,由于缺少相关的验证过程,所得的仿真结果置信度存疑,只能依赖台架试验结果来证明,费时费力,不利于CAE分析改进。本研究提出一种校核修正方法来建立具有较高置信度的发动机曲轴系统仿真模型进行扭振分析,详细讨论了集中模型中各个自由度转动惯量、刚度的确定方法,通过对比验证提高惯量、刚度的准确性;增加轴系三维和一维多级模态对比分析来修正和检验一维当量模型的准确性,提升一维当量模型的置信度。最后通过台架试验对所建立的仿真模型进行置信度验证,结果表明,采用校核修正方法的模型,仿真结果和发动机的实际工作状态具有更好的一致性。
The torsional vibration of crankshaft severely affects the lifetime and NVH performance of engine.A single lumped parameter method was commonly used in engineering to analyze the torsional vibration of crankshaft.But the confidence of obtained simulation results was doubtful due to the lack of relevant verification procedures,so the analysis results can only be verified by test results,which is cost and time consuming and is bad for CAE analysis improvement.Therefore the verification and correction method was put forward to establish a simulation model of engine crankshaft system with a higher confidence for torsional vibration analysis.The method of determining the moment of inertia and stiffness of each degree of freedom in the lumped parameter model was discussed in detail,and their accuracy improved through comparison and verification.The confidence of the one-dimensional equivalent model improved by modifying and verifying the model accuracy based on the comparison and analysis of three-dimensional and one-dimensional multi-level modal of crankshaft.The confidence level of established model was finally verified through bench tests.The results showed that the simulation analysis and experimental test had better consistency by using the verification and correction method.
作者
彭宇明
马健
刘磊
罗振
甘金科
PENG Yuming;MA Jian;LIU Lei;LUO Zhen;GAN Jinke(Engineering Research Center of Advanced Driving Energy-saving Technology Ministry of Education,Chengdu 610031,China;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Dongfeng Commercial Vehicle Technology Center,Wuhan 430056,China;Liu Zhou Long Jie Auto Parts Co.,Ltd.,Liuzhou 545006,China;Chong Qing Chang An Automobile Co.,Ltd.,Chongqing 400000,China)
出处
《车用发动机》
北大核心
2021年第3期14-19,共6页
Vehicle Engine
基金
国家自然科学基金“基于目标规划的汽车NVH界面动态分析设计理论与方法研究”(51775451)。
关键词
扭振分析
集中质量模型
模态分析
曲轴
torsional vibration analysis
lumped mass model
modal analysis
crankshaft
