Mathematical Problems in Engineering / 2014 / Article / Tab 1

Research Article

Internal Leakage Fault Detection and Tolerant Control of Single-Rod Hydraulic Actuators

Table 1

Nominal equivalent parameters of the considered hydraulic system.

Symbol ParameterNominal value

The total mass of the load40 kg
The ram area of the cylinder  m2
The ram area of the cylinder  m2
The coefficient of the viscous friction45 N·s/m
The Coulomb friction52 N
The stiction friction78 N
The Stribeck velocity0.013 m/s
The empirical parameter of the Stribeck effect2
The bulk modulus of the oil in the cylinder200 Mpa
The original total control volume of the cylinder  m3
The original total control volume of the cylinder  m3
The normal coefficient of the internal leakage  m5/Ns
The flow gain of the servovalve  m4/(s·A· )
The supply pressure7 Mpa
The return pressure0 Mpa
The servovalve natural frequency628 rad/s
The servovalve damping ratio0.7
The gain of the servovalve  A/V