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基于ANSYS Workbench的四缸发动机曲轴模态分析(英文)

来源:欧得旅游网
282 Journal of Measurement Science and Instrumentation Vo1.6 No.3,Sept.2015 Modal analysis of 4-cylinder engine crankshaft based on ANSYS Workbench LI Xue-min,CUI Zhi—qin (College of Mechatronic Engineering,North University of China, 猢 030051,China) Abstract:CATIA VSR20 software was utilized to build up 3 three-dimensional solid model of inline four-cylinder gasoline en— gine crankshaft.The free modal analysis of the first six orders from the whole crankshaft model was carried out based on TGrid algorithm by using ANSYS Workbenchl4.0 software and the natural frequency and vibration modes were obtainedThe relia— .bility of the finite element model was verified by comparing with modal test resultThis provides a reference for further design .and optimization of the crankshaft. Key words:ANSYS workbench;model analysis;natural frequency:vibration mode CLD number:TK44 Document code:A Article ID:1674—8042(2015)03—0282—04 doi:10.3969/j.issn.1674—8042.2015.03.014 shaft and overall performance improvement of the in— 0 Introduction The crankshaft,which is one of the most impor— tant part of an internal combustion engine,carries ternaI combustion engine/ 一 . This paper uses three--dimensional modeling soft—— ware CATIA V5R20 to establish the physicaI model of an inline four-cylinder gasoline engine crankshaft and then takes advantage of finite element software ANSYS Workbench1 4.0 to carry out free modal a- nalysis,aiming at obtaining the lower order natural the heaviest load.The crankshaft in operation is mainly affected by gas pressure,reciprocating force and rotating inertia force,which produce alternating bending stress and torsion stress to the crank— shaftE 一 .These torsion and bending stresses resuIt in severe fatigue damage,which is disastrous for in— frequencies and vibration modes of the crankshaft. put checking equipment(ICE).Therefore,we need to obtain more accurate crankshaft stress,deforma— tion,natural frequency and vibration mode since they have very great significance to design of the crank— Establishment of crankshaft model The main dimensions of the inline four-cylinder gasoline engine crankshaft model are shown in Table 1. Table 1 Main dimensions of crankshaft model 1.1 Simplification of crankshaft The structure of crankshaft contains many small are considered in the process of crankshaft modeling, it not only makes the mesh of the finite element very dense,but also greatly increases the number of nodes equation.Moreover,it needs more time for data fillets,chamfers and fine oil holes.If these factors Received date:2015~06—07 Corresponding author:LI Xue-min(xueming666@163.corn) 

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