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Modelování chodicích robotů s pasivní dynamikou
Cvik, Dominik ; Hrabec, Jakub (oponent) ; Grepl, Robert (vedoucí práce)
The presented bachelor's thesis deals with the creation of a model for a passive dynamic walking robot. The research part of the thesis describes the classification of two-dimensional robot designs with passive dynamics, along with a description of selected existing physical implementations of such designs. Equations of motion for the synthetic wheel design are derived analytically in the next chapter. These derived equations of motion are used to obtain initial values of variables, which will later be substituted in the simulation of the same model in Simscape Multibody. These obtained initial values are also substituted into the solution of the equations of motion. A comparison of the state variable time progressions obtained from the simulation and the analytical calculation shows a high agreement between these approaches, with only minor deviations, which are explained by the simplifying assumptions used in the analytical calculation.
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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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