Experimental Study on Dynamic Characteristics of Gas Spring Resonant System

Abstract Gas springs applied to compressors or Stirling generators is an effective way to improve the reliability of engines. It is important to clarify its dynamic characteristics while applying in the power machine. However, there is a lack of methods that can accurately describe the dynamic characteristics of gas springs. In this paper, rotation vector decomposition method and system resonance method to test the equivalent stiffness of a gas spring system are introduced and two methods are experimentally compared. The results show that rotation vector decomposition method is basically consistent with the resonance method, which maximum difference is no more than 10%. In addition, the effects of initial pressure and amplitude on the stiffness and damping characteristics of the gas spring system are analysed, it was found that initial pressure is proportional to the stiffness of the gas spring and damping component of the gas force, while piston amplitude has little effect. The study provides a reference for the structural design of gas springs.