Translational Velocity Actuator (PB)

Ideal velocity actuator, with length, that maintains velocity proportional to the input signal

Since R2024b

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Libraries:
Simscape / Foundation Library / Translational / Sources

Description

The Translational Velocity Actuator (PB) block represents an ideal velocity actuator, with length, that maintains a specified relative velocity regardless of the load at the connected ports.

Connections B and F are position-based mechanical translational conserving ports. The physical signal at port S specifies the relative velocity between the ports B and F. A positive signal at port S indicates that the velocity at port F is greater than at port B.

The block logs these variables:

• f — force that port B applies to port F. A positive logged force indicates that the actuator acts to separate the ports when length is positive, that is, the actuator is in a state of compression. A negative logged force indicates that the actuator acts to bring the ports closer together when length is positive, that is, the actuator is in a state of tension.

• v — relative velocity between ports, specified by the signal at port S, $$v=v_F-v_B$$

For more information, see Data Logging.

The actuator length is $$length=x_F-x_B$$.

The block has no parameters. You specify the actuator length as an initial variable target.

Variables

To set the priority and initial target values for the block variables prior to simulation, use the Initial Targets section in the block dialog box or Property Inspector. For more information, see Set Priority and Initial Target for Block Variables.

Nominal values provide a way to specify the expected magnitude of a variable in a model. Using system scaling based on nominal values increases the simulation robustness. Nominal values can come from different sources, one of which is the Nominal Values section in the block dialog box or Property Inspector. For more information, see Modify Nominal Values for a Block Variable.

Ports

Input

S — Control signal that specifies relative velocity between the ports, m/s

physical signal

Physical signal input port for the control signal that drives the source. A positive signal at this port indicates that the velocity at port F is greater than at port B.

Conserving

B — Base port

position-based mechanical translational

Position-based mechanical translational conserving port that represents the base connection.

F — Follower port

position-based mechanical translational

Position-based mechanical translational conserving port that represents the follower connection. For positive length, port F has a more positive position than port B.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2024b