Problems associated with derivative blocks in simulink

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Zi Huang
Zi Huang 2015-11-23
I encountered a problem with simulink derivative block when I was doing a simulation where third order derivatives of the input is required! However, I could not use three consecutive derivative blocks in simulink since I would get a huge number at t=0 resulted from numerical differentiation. This can be shown as follows
Instead of getting a smooth -cos(x) single I get
Is there a way to get rid of this problem?

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