Reply To: Toolbox features

Home Forums FOMCON toolbox: Support forum Toolbox features Reply To: Toolbox features



This is indeed a valid concern. Roughly speaking, the difference is due to some constraints of the current implementation of the Gr├╝nwald-Letnikov algorithm, which is a fixed-step method. For instance, try lowering simulation step size choosing a time range of about 10-20 seconds—you can easily do this in fotf_gui, i.e. compare results with t=[0:0.01:10] and t=[0:0.001:10]. You will see that the damping ratio of the fractional-order system obtained from the undamped integer-order one will decrease with computation step size.

I will look into this problem soon.