National Repository of Grey Literature 2 records found  Search took 0.01 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.
Self Fine Tuning of LQ Control With Fixed Model
Belda, Květoslav
Setup of suitable weight control parameters and their tuning with respect to topical controlled system behavior is a principal issue of every control design. This contribution roposes the efficient way for setup and tuning of the control parameters of LQ controllers automatically by evaluation of a controlled system response in comparison with a mathematical model following from a physical substance of that system. The controlled systems are considered as stochastic, which corresponds to a stochastic nature of real-life applications. In this paper, there will be explained general assumptions and conditions for the implementation of the proposed way. The theoretical results will be discussed and illustrated by several examples.

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