Research Article
Adaptive PID and Model Reference Adaptive Control Switch Controller for Nonlinear Hydraulic Actuator
Table 1
Variable description.
| Variable | Variable 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 |
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