基于CATIA与ANSYS workbench的四缸发动机曲轴有限元分析

Finite Element Analysis of Four-cylinder Engine Crankshaft Based on CATIA and ANSYS Workbench

曲轴是发动机的重要组成部件,其结构性能(强度、刚度)直接影响到发动机的动力输出和安全寿命。利用三维建模软件CATIA V5R20建立四缸发动机曲轴的实体模型,并基于有限元分析软件ANSYS workbench完成曲轴的静态性能分析和模态分析。结果表明,曲轴挤压工况的最高应力为82.525MPa,受拉工况最大应力9.7548MPa,均出现在主轴颈-曲拐过渡圆角处,该处为应力较大危险区域。当曲轴通过11阶模态分析时,振动频率高达839.28Hz,最大变形为16.126mm,振动和变形最为严重,可用滚压强化、表面淬火等方法处理。分析结果为曲轴优化设计提供了科学依据,可有效降低曲轴设计与制造成本。

Crankshaft is an important component of engine,its structural performance(strength,stiffness)directly affects the engine power output and safety life.Three-dimensional modeling software CATIA V5R20 was used to establish the solid model of four-cylinder engine crankshaft,and the static performance analysis and modal analysis of the crankshaft were completed based on the finite element analysis software ANSYS workbench in this paper.The results show that the maximum stress in the crankshaft extrusion condition is 82.525mpa,and the maximum stress in the tension condition is 9.7548mpa,both of which appear at the corner of the transition between the spindle neck and the crankshaft,which is a dangerous area with high stress.When the crankshaft passes the modal analysis of the 11th order,the vibration frequency is up to 839.28hz,the maximum deformation is 16.126mm.Both the vibration and deformation are the most serious,which can be treated by rolling strengthening,surface quenching and other methods.The analysis results provide scientific basis for crankshaft optimization design and can effectively reduce the cost of crankshaft design and manufacturing.