Hydraulic actuator with analogue position controller¶
This example shows how the Physical Modelling libraries can be used to build systems covering the fields of electricity, mechanics and isothermal fluids. In the model, a hydraulic system implemented using elements of the Isothermal Fluids Library adjusts the position of a mechanical load in response to a voltage. If the control voltage is zero, the displacement of the hydraulic actuator (and load) is also zero, and if it is +5 volts, the displacement is 100 mm.
The actuator control subsystem is implemented using operational amplifiers with the final stage configured as a current source.
A model with this level of fidelity is well suited to support the design and testing of a servo drive controller. It includes electromechanical high frequency modes as well as nonlinear fluid flow effects.
Schematic of the model:¶
Subsystem Schematics:¶
Drive control subsystem:
Distribution valve:
Hydraulic actuator:
Simulation results:¶
Mass displacement in millimetres:
Actuator cylinder pressures:
