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Rotational Damper

Viscous damper in mechanical rotational systems


Mechanical Rotational Elements

  • Rotational Damper block


The Rotational Damper block represents an ideal mechanical rotational viscous damper described with the following equations:




TTorque transmitted through the damper
DDamping (viscous friction) coefficient
ωRelative angular velocity
ωR, ωCAbsolute angular velocities of terminals R and C, respectively

The block positive direction is from port R to port C. This means that the torque is positive if it acts in the direction from R to C.


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.


Damping coefficient

Damping coefficient, defined by viscous friction. The default value is 0.001 N*m/(rad/s).


The block has the following ports:


Mechanical rotational conserving port.


Mechanical rotational conserving port.

Extended Capabilities

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

Version History

Introduced in R2007a