Hydraulic Actuator with Digital Position Controller

This example shows a two-way valve acting in a closed-loop circuit together with a double-acting cylinder implemented in the isothermal liquid domain. The controller is represented as a continuous-time transfer function plus a transport delay. The delay allows for the computational time (one discrete time period) plus the zero-order hold (half a discrete time period) when implemented in discrete time. The model is configured for linearization so that a frequency response can be generated. To configure for faster desktop simulation, comment through the transport delay and increase the solver maximum step size.

Model

Hydraulic Actuator Subsystem

Hydraulic Cylinder Subsystem

Simulation Results from Scopes

Simulation Results from Simscape Logging

Frequency Response