Sliding mode control simulink

2022 11 29
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Hello!
Herewith my simulation and example from Book 'sliding mode control and observation'(Yuri Shtessel)
I try to get similar pic, but i do not know where is my problem.
I set fixed-step as 0.0001 for reaching phase. scope shows zero always.
thank you for your any suggestions.

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Paul
Paul 2022-11-29

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Hi KAI,
Do any of the integrators have a non-zero initial condition?
Also, might want to consider using a variable step solver, which will do a better job of catching the sign changes in the input to the Sign block.

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KAI DONG
KAI DONG 2022-11-29
actually, from pic attached, I can see X1(0)=0.5. but i tried, I did not get the right pic. so sad. thank you for your kind help
KAI DONG
KAI DONG 2022-11-29
Thank you. I found my problem. many thanks

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