Variable Translational Damper

R2026b

Translational viscous damper with variable damping coefficient

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Variable Translational Damper block

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Libraries:
Simscape / Driveline / Couplings & Drives / Springs & Dampers

Description

The Variable Translational Damper block represents a translational viscous damper with variable damping coefficient. A physical signal input port provides the magnitude of the translational damping coefficient. The magnitude of the damping force is equal to the product of the physical signal input and the relative linear velocity between the two translational conserving ports.

The block finds the damping force, such that:

$$F=\{\begin{array}{cc}B.v,& B\ge B_{\min }\\ B_{\min }\cdot v,& B<B_{\min }\end{array}$$

where:

• F is the force transmitted through the translational damper between the two translational conserving ports.

• B is the viscous damping coefficient, specified at port B.

• B_min is the minimum allowed damping coefficient, specified by the Minimum damping coefficient parameter. The block saturates inputs that are below this value.

• v is the relative linear velocity measured between the two translational conserving ports.

• v_R is the linear velocity of port R.

• v_C is the linear velocity of port C.

The block applies equal and opposite damping forces on the two translational conserving ports. The sign of the damping force acting on port R is equal to the sign of the relative linear velocity. A positive linear velocity corresponds to a positive damping force acting on port R, and a negative damping force of equal magnitude acting on port C.

Assumptions and Limitations

• The block represents strictly viscous damping.

• The value of the damping coefficient must be greater than or equal to zero.

Ports

Input

B — Damping coefficient, N/(m/s)

physical signal

Physical signal input port representing the variable translational damping coefficient, in N/(m/s).

Programmatic Use

Port: B

Conserving

R — Rod

mechanical translational

Mechanical translational conserving port associated with the damper rod.

Programmatic Use

Port: R

C — Case

mechanical translational

Mechanical translational conserving port associated with the damper case.

Programmatic Use

Port: C

Parameters

Minimum damping coefficient — Lower bound on damping coefficient

0 N/(m/s) (default) | nonnegative scalar

Minimum value allowed for the variable damping coefficient. The physical signal input saturates below the specified value. The value must be greater than or equal to zero.

Programmatic Use

Parameter: Bmin

Extended Capabilities

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

Version History

Introduced in R2013a