NonlinearSpringFault:

Path: Math/FDIR

% Nonlinear spring fault. 
   Generates a cubic spring force that grows
   with the function (1 - exp(d.a*dT)) where dT is the time since the
   fault. Prior to the fault, the force is zero.

   Since version 9.
--------------------------------------------------------------------------
   Form:
   f = NonlinearSpringFault( x, t, d )
--------------------------------------------------------------------------

   ------
   Inputs
   ------
   x		(2,1)  State
   t       (1,1)  Time
   d       (1,1)  Input data structure

   -------
   Outputs
   -------
   f    	(1,1)  Force due to fault

--------------------------------------------------------------------------
   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.
--------------------------------------------------------------------------

Back to the Math Module page