MODEL REFERENCE ADAPTIVE CONTROL (MIT RULE) OF A
SUSPENDED COMPOUND PENDULUM
MIT rule predicts the controller parameters as given in the below equation:
,
where γ is design parameter (It is going to be
called "gamma" for the rest of this tutorial), e is the error between the
output of the plant and the output of the reference model, and finally the
last term (It is going to be called "sens" for the rest of the tutorial) is
called the sensitivity derivative. MIT rule predicts the controller
parameters by comparing the output of the plant and a reference model whose
behavior MIT rule is imposing on the plant. The
output of the plant, suspended pendulum is taken as the linear combination
of the angular position and velocity. Hence
MIT rule of Model reference adaptive control implies
where k1, k2, and k3 are controller
parameters that are going to be predicted by the MRAC MIT rule. k1
is the gain on the command, k2 and k3 are the output
feedback gains.
The equations of motion of the suspended compound pendulum is:
This gives us the following equation:
Applying the MRAC (MIT rule) to the system given by the above equation, following is obtained:
k1, k2 and k3 must be adapted with the following equation:
.
For questions, please feel free to contact vefa@drexel.edu.