Design and dynamic performance research of MR hydro-pneumatic spring based on multi-physics coupling model

Abstract

Aiming at the problem that the damping coefficient of the traditional hydropneumatic spring cannot be adjusted in real-time, the magnetorheological (MR) damping technology was introduced into the traditional hydro-pneumatic spring with single gas chamber. A new shear-valve mode MR hydro-pneumatic spring was proposed. And its dynamic performance was analyzed based on multi-physical coupling simulation and mechanical property test. Firstly, a structural scheme of MR hydropneumatic suspension was proposed to ensure the original height adjustment function based on the working principle of traditional hydro-pneumatic suspension with single gas chamber. Secondly, based on the design requirements, the parameter of MR hydropneumatic spring damping structure was designed by using MR damper design method. Thirdly, the multi-physical coupling dynamic performance of the MR hydro-pneumatic spring damping structure was analyzed based on the electromagnetic field analysis theory, flow field analysis theory and thermal field analysis theory. The analysis results showed that the designed MR hydro-pneumatic spring has reasonable magnetic circuit structure and excellent working performance. Then, the mechanical properties of MR hydro-pneumatic spring were tested. The results showed that the maximum damping force can reach 20kN, and the dynamic adjustable multiple can reach 6.4 times. It has good controllability and meets the design requirements. Finally, a nonlinear model of MR hydro-pneumatic spring was established based on the elastic force calculation model of the gas and the Bouc-Wen model. The simulation results of the established model agree well with the experimental results, which can accurately describe the dynamic properties of the hydro-pneumatic spring. The proposed design and modeling method of the MR hydro-pneumatic spring can provide a theoretical basis for the related vibration damping devices.

Multi-Physics Simulation and Experimental Verification of Magnetorheological Damper with Additional Stiffness

“…In addition, to realize the coupling analysis between electromagnetism and fluid mechanics, an expression describing the relationship between the applied magnetic field and the apparent viscosity of the MRF needs to be established. In order to solve the problem of discontinuity in the description of viscosity due to the traditional Bingham model and consequently the non-convergence in simulation calculations, a modified Bingham model [26,36,37] is used to define the viscosity of MRF in simulations.…”

Simulation and Experimental Study on Sealing Characteristics of Hydro-Pneumatic Spring GS Seal Rings

“…Hydro-pneumatic suspension is widely used in military vehicles, mining trucks, and construction machinery vehicles due to its nonlinear variable stiffness characteristics and nonlinear damping characteristics [1,2]. The hydro-pneumatic spring is the core component of hydro-pneumatic suspension; it uses inert gas as the elastic medium, with oil to transmit pressure, and through the compressibility of elastic gas and the damping characteristics of hydraulic oil, adapting to the various use conditions of the vehicle [3][4][5][6], the reciprocating linear movement of hydro-pneumatic springs and high-pressure impact imposes higher requirements on the sealing structure. The sealing form of a hydro-pneumatic spring is mainly divided into static and dynamic seals: the static seal is composed of an O-ring and retaining ring, located between the end cover and the cylinder barrel; the dynamic seal consists of a GS sealing ring, which is located between the end cap and the piston rod.…”