Static and Coulomb friction coefficient vector

Question

yanshu 2023-5-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1972364-static-and-coulomb-friction-coefficient-vector

编辑： yanshu 2023-6-1

I'm now using the disc brake block form Simulink, and I want to know how to set the Static and Coulomb friction coefficient vector about the block. I only know the mean value of static friction coefficient and I want to know how to chang it into vector form, and how to get the Coulomb friction coefficient.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Abhijeet 2023-5-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1972364-static-and-coulomb-friction-coefficient-vector#answer_1247514

Hi,

Given the value of static friction, it is not possible to obtain the static friction coefficient vector and Coulomb friction coefficient with certaininty.

However, we can assume the values for the static friction coefficient. However we can not precisely determine its exact values as it may vary in different directions of the contact plane.

You can get the estimated value of static friction coefficient by using the formula:

μ_s = μ_s * [1 1 1]

For example if the mean value of static friction coefficient is 0.3 then the static friction coefficient vector will be: μ_s = [0.3 0.3 0.3]

The Coulomb friction coefficient is the ratio between the maximum force of friction required to maintain that motion and the normal force between the two surfaces. The Coulomb friction coefficient can be estimated to be the same as the static friction coefficient, assuming that the block is already in motion with a constant speed. However, if the block's speed changes, the frictional force required may no longer be proportional to the normal force, and the Coulomb friction coefficient may change.

Thanks