[scilab-Users] System Identification with frfit()

[Michael J. McCann]

John,
         The elastic belt will give a compliance and a means of 
storing energy hence an increase in the order of the system. I see 
the inertia of the motor, the stretch of the belt and the inertia of 
the load  as energy storage elements, maybe an inductance in the 
motor. Each will be a second order component dx/dt and x(t), though 
maybe the belt can be considered a spring of zero inertia. The 
backlash in the gears will create another non-linearity and a 
potential for trouble when you try to get it under control. We could 
always do a simulation and a time domain solution (Scicos).
Mike.
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At 12:48 2008-05-06, you wrote:
>Hi Mike,
>Thanks for the suggestion; I'll give it a go. The system should be simple,
>it's a DC motor driving a solid load via gears and belts. I think that the
>complexity comes from stretching in the belts, lost motion in the gears and
>nonlinear effects in the motor, which is why I was looking to identify it
>empirically.
>Regards, John