Research Article

Adaptive PID and Model Reference Adaptive Control Switch Controller for Nonlinear Hydraulic Actuator

Table 1

Variable description.

VariableVariable description

Supply pressure of open chamber
Piston displacement
Piston area
Valve stem area
Sea water density
Spring elastic coefficient
Inner diameter of guide hole
Length of guide hole
Working water depth
Spring precompression
Piston rod area
Mass of piston
Control fluid viscosity
Gravity acceleration
Resistance in operating process
Resistance coefficient