Aiming at the strength analysis of the crankshaft of the compressor core component caused by the large increase of the compressor pressure, the dynamics of the compressor mechanism and the crankshaft fatigue was analyzed. First the multi-rigid-body model of the crank connecting rod mechanism was established based on the theory of multi-rigid-body system. The kinematics and dynamics of crank connecting rod mechanism were analyzed by ADAMS. The displacement, velocity and acceleration of the piston were obtained at a certain moment. Compared with the theoretical calculation, the error of the two was within the allowable range of error was found, and that the force distribu-tion of the crank pin was mainly got. At last the static characteristics of the crankshaft of its key components were analyzed, and its static strength and fatigue strength were checked under the action of alternating load. The results indicate that the safety factor from the stress curve and the stress amplitude curve are within the allowable range and the strength meets the design requirements.%针对压缩机压力的大幅度提高所带来的压缩机核心部件曲轴的强度分析问题,对压缩机机构进行了动力学分析及曲轴疲劳研究.首先基于多刚体系统相关理论建立了曲柄连杆活塞机构多刚体模型,使用ADAMS对其进行了运动学仿真,得出了活塞某一时刻的位移、速度、加速度值,然后与活塞此刻的理论计算结果进行对比,发现两者的误差都在允许的范围内,进而对其进行了动力学仿真,得出各连杆轴颈所受到的交变载荷,为下面曲轴的疲劳分析提供基础.最后对其关键部件曲轴进行了静态特性分析,在交变载荷的作用下完成其静态强度和疲劳强度的校核.研究结果表明,从应力曲线图与应力幅值曲线图中得出其安全系数均在许用范围内,证明其强度满足设计要求.
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