MTS Landmark TWX - Manual (Page 56)

Description Item
Controlling Element 2
Controlled Element 3
Command 4
The controlling element is the computer, the digital controller, and the MTS Station Manager application.
The controlling element produces a control signal (Command) that represents the direction and amount
of force the actuator should apply to the specimen. The controlled element comprises the servovalve, the
hydraulic actuator, and the specimen itself. The controlled element applies the required forces (Command)
to the specimen and the specimen reacts to it. The Feedback is the response from one of various sensors
that indicates how the controlled element has responded.
Closed Loop Control Step-by-Step
The following closed-loop diagram illustrates how the system operates when you use the Manual Control
panel in the Station Manager application to apply a compressive force to the specimen. Assume that the
system is in Force Control.
56 | MTS Landmark Test System Operation
Key Concepts