Dynamic Analysis of Reciprocating Compressor with Crankshaft Crack

Abstract

In order to study the influence of crankshaft crack on the dynamics of reciprocating compressor, the model of crankshaft flexible body with crack was established by using finite element method, and the flexible body was activated for analysis and calculation during dynamic simulation. Through the analysis of the simulation results of the rigid body model and rigid flexible coupling model, it can be seen that the crank-shaft has a small deformation under the force of piston force. Comparing the simulation results of rigid flexible coupling model with crack and without crack when crankshaft rotates clockwise, it is found that the existence of crack increases the deformation of crankshaft. By comparing the simulation results of the rigid flexible coupling model with and without crack when the crankshaft rotates counterclockwise, the influence of crankshaft steering on the deformation of cracked crankshaft is found. The stability of the system is discussed by using phase diagram and Lyapunov exponent. The results show that the motion of the system is chaotic when the crankshaft with cracks rotates in reverse direction.