Dynamic analysis of 3W2 high pressure compressor mechanism and research on crankshaft fatigue

HENG Pan pan1, GUAN Renwei2, ZHANG Qiu ju2

(1.School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China;
2.Jiangsu Province Key Laboratory of Advanced Food Manufacturing Equipment and 
Technology, Wuxi 214122, China)

Abstract: 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 distribution 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.

Key words: compressor; crankshaft; static strength; fatigue strength; stress amplitude