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Comparison of Friction Models

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Comparison of Friction Models

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In order to get insight in the friction phenomena, a friction model should incorporate as much friction phenomena and behave as much as real friction. In the table below an overview of the different models of the 20-sim library with respect to the friction phenomena is given.

 

Coulomb model

Coulomb, viscous model

static, Coulomb, viscous model

static, Coulomb, viscous, Stribeck model

LuGre model

static friction phenomena

 

 

 

 

 

Coulomb

V

V

V

V

V

viscous

 

V

V

V

V

static

 

 

V

V

V

Stribeck

 

 

 

V

V

dynamic friction phenomena

 

 

 

 

 

pre-sliding displacement

 

 

 

 

V

varying break-away force

 

 

 

 

V

frictional lag

 

 

 

 

V

 

From this overview it can be seen that all friction phenomena are incorporated in the LuGre model. From the literature, it is known that the behavior of the LuGre model is much alike real friction.

 

For most engineering applications, a static friction model, for example a static, Coulomb, viscous friction model, is sufficient. If all friction effects should be modeled, the LuGre friction model seems best suited.