Abstract
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 t...
Highlights
We find that the storage stiffness curves shift along the frequency axis for different c2Q values, and the shape remains almost invariable
The force (F) provided by the dual-chamber hydro-pneumatic (DCHP) suspension consists of frictional force (Ff), damping force (c Á X1 cos u) and spring force (k Á X1 sin u)
The predictions for equivalent damping show some discrepancies with the experimental measurements for the low-frequency ranges, the behavior of the DCHP suspension is accurately predicted for the whole frequency range using the models based on both nonlinear vibration theory and fractional calculus theory
Summary
Due to their nonlinear stiffness, pneumatic vibration isolators have been widely used for vibration isolation in many engineering structures such as vehicle suspensions, high-precision manufacturing equipment, and seat suspensions, which were gradually improved.[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]. The linear model is unable to describe the effect of the nonlinearity of a restoring force on the equivalent stiffness, damping coefficient, and isolation performance for a DCHP suspension. The quartic term in the simplified storing force model means that the DCHP suspension is a hardening isolation system in the direction of the compression, but a softening isolation system in the direction of the extension. Overall, it is a hardening system in a complete isolation cycle, which is one of the advanced properties of a hydro-pneumatic suspension. The bias terms Z0 and D0 refer to the static equilibrium positions, and there is a phase difference u between the displacement solution z and the dynamic deformation d: Substituting the approximate solutions into equation (10) and equating the coefficients of sin (vt) and cos (vt) yields the following equations
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