Engee documentation

Variable Translational Damper

Progressive viscous damper with variable damping coefficient.

variable translational damper

Description

The Variable Translational Damper block is a progressive viscous damper with a variable damping factor. The value of the variable damping coefficient is input to input port B. The magnitude of the damping force is equal to the product of the value at port B and the relative linear velocity between the two non-directional ports. A minimum damping factor value prevents non-physical negative damping factor values.

The reciprocating damping force satisfies the following expression:

where

  • - the force transmitted through the translational damper between two non-directional ports of translational motion;

  • - is the viscous damping coefficient;

  • - minimum permissible damping coefficient;

  • - relative translational velocity measured between the two non-directional ports;

  • - port translational velocity R;

  • - port translational velocity C.

The unit applies equal opposite damping forces to the two non-directional ports. The sign of the damping force acting on port R is equal to the sign of the relative translational velocity. A positive velocity corresponds to a positive damping force acting on port R and a negative damping force of the same magnitude acting on port C.

Assumptions and limitations

  • The block represents viscous damping only.

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

Ports

Conserving

# R — non-directional progressive port
translational mechanics

Details

Non-directional progressive port.

Program usage name

rod_flange

# C — non-directional progressive port
translational mechanics

Details

Non-directional progressive port.

Program usage name

case_flange

Input

# B — variable damping factor
scalar

Details

Variable damping factor.

Data types

Float64.
Complex numbers support

No

Parameters

Parameters

# Minimum damping coefficient — minimum damping factor
kg/s | N*s/m | N/(m/s) | lbf/(ft/s) | lbf/(in/s)

Details

The minimum permissible damping factor. If the value on port B is less than this value, it is equated to it. The value of this parameter must be greater than or equal to zero.

Units

kg/s | N*s/m | N/(m/s) | lbf/(ft/s) | lbf/(in/s)
Default value

0.0 N*s/m
Program usage name

C_min
Evaluatable

Yes