Hydro-Pneumatic Suspension System Hybrid Reliability Modeling Considering the Temperature Influence

Abstract

Hydro-pneumatic suspension systems have been widely used in many fields for their variable stiffness characteristics that effectively improve the comfort and operation stability of a vehicle. However, due to poor environmental conditions, hydro-pneumatic suspension is frequently subjected to the influence of transient impact and environmental temperature changes, which results in sealing failure and gas leakage problems and reduces the reliability of the system. In this paper, a method combining parametric modeling and probability analysis is adopted to establish the reliability model of a hydro-pneumatic suspension system considering the influence of temperature variations. First, the working principle and failure mode of the hydro-pneumatic suspension system are analyzed, and then the reliability of the hydro-pneumatic suspension system is defined. On this basis, for the key failure modes of the hydro-pneumatic suspension system, a reliability model based on the allowable height and a reliability model based on the allowable stiffness are established. The system reliability model of the hydro-pneumatic suspension system is obtained synthetically. Finally, the single-chamber hydro-pneumatic suspension system is selected as the experimental object. Comparative tests of different design parameters of the hydro-pneumatic suspension system under temperature effect are conducted. The accuracy is verified for the failure mode analysis and reliability model of the hydro-pneumatic suspension system.