Modeling And Dynamic Analysis Of A Novel Hydro-pneumatic Suspension System

Vibration problem is one of the key points, which affects the system performance in industrial areas, such as the mechanical engineering, construction, medical industry and automobile industry and so on. Therefore, the research of the vibration problem has become an important objective in almost every industry. The main issue in vibration research area is to choose the reasonable and efficient vibration suppression methodology to meet the industrial requirements.The basic working principle of the hydro-pneumatic damper, as one of the effective vibration suppression methods, is to transport the excitation force through the hydraulic oil and utilize the inert gas(Nitrogen) as the elastic medium. The traditional hydro-pneumatic damper is to provide the restoring and damping force through the hydraulic actuator/damper method, in which the inner gas mainly plays the role of the restoring energy.A novel compact hydro-pneumatic damper will be proposed in this dissertation. In this design, the gas chamber has been integrated into the main structure, and the restoring force generated by the gas chamber will be amplified by the hydraulic unit. Therefore, this design can provide the sufficient restoring force with small size, and the same acting force under related small charging pressure, which will be a significant benefit for the structural sealing and the strength problem.The modeling procedure, design processing, static analysis and dynamic analysis of the proposed compact hydro-pneumatic damper will be investigated in this dissertation, and the validity of this design will be verified through the established virtual prototyping, which is established based on the ADAMS. Moreover, the investigation of the stiffness and damping properties will also be presented based on the study of the static/dynamic analysis of the proposed compact hydro-pneumatic damper. It will be illustrated that(1) the larger storing force can be generated by the small size of the damper;(2) the nonlinear characteristics of the damper improve the carrying capacity and the vibration suppression property;(3) the integrated structure and the characteristic of adjusting the initial pressure and volume in the gas chamber conveniently could enlarge the installation space of the damper and make the hydro-pneumatic damper satisfy a variety of working conditions.