Implicit and explicit model-following helicopter flight controllers

Author(s):  
Zohreh Mirfakhraie ◽  
William Garrard
Author(s):  
Natalia Dmitrenko ◽  
Anastasiia Petrova ◽  
Olena Podzygun

The article is dedicated to the problem of using learning strategies in the process of ESP acquisition of intending educators. The authors analyzed the methodological literature on the research topic, on the basis of which the definitions and main characteristics of learning strategies, as well as the implicit and explicit ways of using the strategies in the process of ESP acquisition of intending educators, are presented. R. Oxford’s explicit model of using the instruction-based learning strategies is considered in detail: an algorithm for its use is presented, as well as the basic rules that should be followed in the process of using the model. During the experimental teaching of ESP of intending teachers, R. Oxford’s explicit model of using the instruction-based learning strategies was tested. At the beginning and the end of the experimental training, the questionnaires were conducted to establish the level of proficiency in the learning strategies, as well as the control testing was performed to define the level of ESP acquisition of intending educators. The results of the research confirmed the effectiveness of the used model, which showed an increase in the level of proficiency in the strategies: effective memorization, mental processes, compensatory ability, organization of education and its assessment, management of emotions and collaboration with other students. In turn, the increase in the level of proficiency in the learning strategies was positively reflected in the level of ESP acquisition of intending educators. 


2020 ◽  
Vol 65 (3) ◽  
pp. 1-16
Author(s):  
Umberto Saetti ◽  
Joseph F. Horn ◽  
Sagar Lakhmani ◽  
Constantino Lagoa ◽  
Tom F. Berger

The objectives of this paper are to advance dynamic inversion (DI) and explicit model following (EMF) flight control laws for quadrotor unmanned aerial systems (UAS) and to develop an efficient strategy to compute the stability and performance robustness statistics of such control laws given parametric model uncertainty. For this purpose, a parametric model of a quadrotor is identified from flight-test data. The identified model is validated both in frequency and time domains. Next, DI and EMF flight control laws are designed for both inner attitude and outer velocity loops. Finally, a novel approach based on an unscented transform is used to evaluate the statistics of the controller's performance based on the statistics of the uncertain model parameters.


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