Using Simulink     Search    Help Desk 
Coulomb and Viscous Friction

Model discontinuity at zero, with linear gain elsewhere.

Library

Nonlinear

Description

The Coulomb and Viscous Friction block models Coulomb (static) and viscous (dynamic) friction. The block models a discontinuity at zero and a linear gain otherwise. The offset corresponds to the Coulombic friction; the gain corresponds to the viscous friction. The block is implemented as

where y is the output, u is the input, and Gain and Offset are block parameters.

The block accepts one input and generates one output.

Data Type Support

A Coulomb and Viscous Friction block accepts and outputs real signals of type double.

Parameters and Dialog Box

Coulomb friction value
The offset, applied to all input values. The default is [1 3 2 0].
Coefficient of viscous friction
The signal gain at nonzero input points. The default is 1.

Characteristics

Direct Feedthrough
 Yes
Sample Time
 Inherited from driving block
Scalar Expansion
 No
Vectorized
 Yes
Zero Crossing
 Yes, at the point where the static friction is overcome


[ Previous | Help Desk | Next ]