摘要
曲轴是发动机主要的零部件之一,对发动机的整体可靠性及寿命都有很大的影响。利用SolidWorks软件建立某六缸车用柴油发动机曲轴3D实体模型,并基于ANSYS Workbench软件对曲轴进行有限元分析。对整体曲轴进行模态响应分析,得到其固有频率和固有振型。在低频状态下,曲轴主要发生弯曲变形;在高频状态下,曲轴主要发生伸缩扭转变形。随着频率增大,曲轴连杆轴颈与曲柄臂的连接处和主轴径与曲柄臂过渡圆角连接处的伸缩扭转变形越大,为曲轴的危险区域。以模态分析结果作为参考,重点分析了每个气缸在最大拉压工况下的应力分布,并校核了其疲劳安全系数。最终结果表明,此曲轴强度满足设计要求。
The crankshaft is one of the main components of engine,and it has a great impact on the overall reliability and life of engine.The 3D solid model of a 6 cylinder vehicle diesel engine crankshaft was established by using Solid Works software,and the crankshaft was analyzed by finite element analysis based on ANSYS Workbench software. Firstly,the modal response analysis of the crankshaft was made,the inherent frequencies and vibration modes were gotten. In the low frequency condition,the crankshaft bending deformation was mainly presented;in high frequency state,the torsional and expansion deformation was mainly presented. With the increase of the frequency,the torsional deformation of the connecting rod between the connecting rod journal and the crank arm transition fillet and the spindle diameter and the crank arm transition fillet were greater. Based on the results of the modal analysis,the stress distributions of each cylinder under the maximum tension and pressure conditions were analyzed emphatically,and the fatigue safety factor were checked. It is shown that the strength of the crankshaft can meet the design requirements.
出处
《汽车零部件》
2017年第10期20-24,共5页
Automobile Parts
关键词
柴油发动机曲轴
有限元分析
模态响应
疲劳安全系数
Diesel engine crankshaft
Finite element analysis
Modal response
Fatigue safety factor
