NonlinearSpring:

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   Right-hand-side of a nonlinear spring dynamics model.

   Since version 9.
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   Form:
   dX = NonlinearSpring( x, t, d )
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   ------
   Inputs
   ------
   x		(4,1)  State
   t   (1,1)  Time
   d   (1,1)  Input data structure

   -------
   Outputs
   -------
   dX	(4,1)  State derivative

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   References: Demetriou, M. A. and M. M. Polycarpou. "Incipient Fault
               Diagnosis of Dynamical Systems Using Online Approximators."
               IEEE Trans. Automatic Control, Vol. 43, No. 11, Nov. 1998,
               pp. 1612-1616.
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Children:

Math: FDIR/NonlinearSpringFault