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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Comparison of Nonlinear Observers for Underactuated Mechanical Systems
 Anderle, Milan ; Čelikovský, Sergej
This paper provides the comparison of nonlinear observers for underactuated mechanical systems with aplication to Acrobot walking. Namely, it aims to compare a reduced observer for the Acrobot angular velocities based on the respective angles measurements with a observer for the Acrobot angular velocity and angle based on the other angular velocity and angle measurement and then to combine this observers with the earlier developed full state feedback controllers. For the Acrobot it is not possible to measure the angle between its stance leg and the surface directly because this angle is underactuated. One possibility of measuring this angle is using laser beam sensor and then computation the stance angle from that distance. Main disadvantage of this approach is the high price of the laser beam sensor. The other observer is based on angular velocity of stance leg measurement using the digital gyroscope.
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Porovnání analytických a numerických metod v oblasti řízení Acrobota
 Anderle, M. ; Čelikovský, Sergej
This paper aims to compare the performance of various techniques for the stabilization of the error dynamics of the Acrobot’s walking like reference trajectory. Both the walking reference planning and the tracking feedback design are based on the Acrobot’s model partial exact feedback linearization of order 3. Namely, such an exact system transformation leads to an almost linear system where error dynamics along trajectory to be tracked is a 4 dimensional linear time varying system having 3 time varying entries only, the remaining entries are either zero or equal to one.
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