Research on Nonlinear Stiffness Characteristics of Hydro-Pneumatic Spring
A kind of hydro-pneumatic spring with adjustable stiffness was designed. The two-level stiffness converse each other when oil pressure reach a certain value. A complex nonlinear mathematic model of hydro-pneumatic spring was set up on the basis of comprehensive analysis of it s working principle and structure. Simulation results comparison and theoretical analysis with the test data of bench test showed that the mathematic model is authentic.
J. W. Zhang et al., "Research on Nonlinear Stiffness Characteristics of Hydro-Pneumatic Spring", Applied Mechanics and Materials, Vols. 128-129, pp. 421-425, 2012