Dynamic characteristic analysis of crank connecting rod mechanism in star-type air compressor

Abstract

[Objectives] Compared with other types of air compressor, reciprocating compressors can obtain compressed air with a higher pressure, exerting more stress on the crank connecting rod mechanism. [Methods] This paper analyzes the inertia force and torque characteristics of the three structural forms of the star-type reciprocating air compressor. It then concludes that the air compressor has a good self-balance ability of inertial force while also reducing inertial torque to a certain extent at the same time. A virtual prototype of a crank connecting rod mechanism is built. The derivation of the force on the piston is acquired in order to construct a SPLINE curve, which is loaded on the centroid of the piston. With a flexible crankshaft, the contact force model of the IMPACT function is added between the crank pin and connecting rod. [Results] The dynamic simulation results show that the air compressor can self-balance second-order inertial force. Clearance will decrease the vibration of the air compressor to a certain extent, but will greatly broaden the excitation frequency band. [Conclusions] The findings of this paper can provide valuable references for the design of air compressors.

Keywords

• air compressor
• crank connecting rod
• ADAMS virtual prototype
• dynamic balance
• clearance motion pair