Investigation of the Dynamic Behavior of Servo Hydraulic Drives

The behaviour of servohydraulic drives is governed by a set of nonlinear, singularily perturbed differential equations with non differentiable right hand sides. Modern dynamic systems theory is applied to deepen qualitative insight and to derive compact quantitative information. System behavior is described sufficiently by a reduced set of equations which is obtained if oil compressibility is neglected. Solutions for this set of equations are given by explicit fomulae. In this reduced case discontinuities for the pressures can occur which become transition layers for the full equation set. Stability properties too are strongly related to oil compressibility.