Numerical analysis of a dual-chamber hydro-pneumatic suspension using nonlinear vibration theory and fractional calculus

A dual-chamber hydro-pneumatic suspension, a modified version of the traditional hydro-pneumatic suspension, can provide enhanced isolation performance. In this article, we use two very different theories, nonlinear vibration theory and fractional calculus theory, to analyze the characteristics of a dual-chamber hydro-pneumatic suspension. We find that both the storage stiffness and damping coefficient show a strong dependency on the excitation frequency. The effect of various suspension parameters on storage stiffness and damping coefficient is discussed in detail using numerical simulation. We also performed experiments that confirm the validity of the mathematical expressions for both the storage stiffness and the damping coefficient.