Linearize Implicit Nonlinear ODE System in Simulink
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Hello,
what I basically want to do is to linearize my 6 Degree of Freedom Aircraft Model. I have the model built in Simulink and also have written a Trim Routine as a Matlab Script to find the stationary points of the Simulink model.
Now i want to linearize around this stationary points, with another Malab script. I know Matlab has linearization functions like linmod,..., but I'm not fully satisfied with them as they assume the ODE System in the form of
- x_DOT = fct(x, u)
I rather want to treat the more general case of
- 0 = fct(x_DOT, x, u)
as some aerodynamic derivatives like the lift also are dependent on these DOT States.
As of now i used commands like
y = feval(Model_Name,0, xB, uB, 'outputs');
to calculate the matrices A, B, C, D. But these executions of some particular phase of a Simulink Model do not give the possibility to specify different State Dots.
Does anyone know how to access these? Or is this just no possible?
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