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Question: Why my friction curve is discontinuous?

Question:Why my friction curve is discontinuous?

zhong chen 50 MapleSim 4
October 06 2010
3

I want to simulate the model as show in Fig.1 

Fig. 1

Its equation of movement is 

eq

and its mathematical solution can be caculate as Fig. 2

Fig. 2

I created a model (Fig. 3) to simulate it

Fig. 3

and the component of the friction was definited as

ff1

However, the result is  discontinuous (Fig. 4)

simulation result

Could you please to explain the reason of discontinuous?

think you very much.

 

Here is the .msim file

 

cj-??-????rff.msim
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