Rotational Damper (AB)
Libraries:
Simscape /
Foundation Library /
Rotational /
Elements
Description
The Rotational Damper (AB) block represents an ideal viscous damper in angle-based rotational systems. The block uses the equations
where:
t is the torque of port B acting on port F.
D is the damping coefficient, which is defined by viscous friction.
ωRel is the relative angular velocity between ports.
ωB and ωF are the angular velocities of ports B and F, respectively.
θRel is the relative angle between ports.
θB and θF are the angles of ports B and F, respectively.
B and F are angle-based rotational conserving ports. For positive relative angle, port F has a more positive angle than port B. Positive torque drives port F in the positive direction.
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.
Examples
Interpreting Angle in the Angle-Based Rotational Domain
Set up and interpret angles in angle-based rotational models. It provides background information to explain the underlying concepts. The angle-based rotational domain tracks angle, θ, and rotational velocity, ω, at every node. Use angle-based rotational blocks to model rotational systems where knowing multiple component angles is important.
Interpreting Torque in the Angle-Based Rotational Domain
Describes how to interpret torques in a Simscape™ angle-based rotational network. It outlines the key concepts for understanding the signs of logged torques. It examines rotational spring systems driven by torque sources at different ends, as well as a rotational system of inertias, to illustrate the torque behavior.
Ports
Conserving
Parameters
Extended Capabilities
Version History
Introduced in R2026a
