AC Machine Modeling

Author(s):  
Lingling Fan ◽  
Zhixin Miao
Keyword(s):  
2015 ◽  
Vol 43 (14) ◽  
pp. 1610-1620 ◽  
Author(s):  
Daniel Foito ◽  
José Maia ◽  
V. Fernão Pires ◽  
João F. Martins

2014 ◽  
Vol 25 (4) ◽  
pp. 481-492 ◽  
Author(s):  
Marcio L. Magri Kimpara ◽  
Ruben Barros Godoy ◽  
Pedro E. M. Justino Ribeiro ◽  
Luiz E. Borges da Silva ◽  
Babak Fahimi ◽  
...  

2021 ◽  
Vol 22 (11) ◽  
pp. 601-609
Author(s):  
A. S. Samoylova ◽  
S. A. Vorotnikov

The walking mobile robots (WMR) have recently become widely popular in robotics. They are especially useful in the extreme cases: search and rescue operations; cargo delivery over highly rough terrain; building a map. These robots also serve to explore and describe a partially or completely non-deterministic workspace, as well as to explore areas that are dangerous to human life. One of the main requirements for these WMR is the robustness of its control system. It allows WMR to maintain the operability when the characteristics of the support surface change as well as under more severe conditions, in particular, loss of controllability or damage of the supporting limb (SL). We propose to use the principles of genetic programming to create a WMR control system that allows a robot to adapt to possible changes in its kinematics, as well as to the characteristics of the support surface on which it moves. This approach does not require strong computational power or a strict formal classification of possible damage to the WMR. This article discusses two main WMR control modes: standard, which accord to a serviceable kinematics, and emergency, in which one or more SL drives are damaged or lost controllability. As an example, the structure of the control system of the WMP is proposed, the kinematics of which is partially destroyed in the process of movement. We developed a method for controlling such robot, which is based on the use of a genetic algorithm in conjunction with the Mealy machine. Modeling of modes of movement of WMR with six SL was carried out in the V-REP program for two cases of injury: absent and not functioning limb. We present the results of simulation of emergency gaits for these configurations of WMP and the effectiveness of the proposed method in the case of damage to the kinematic scheme. We also compared the performance of the genetic algorithm for the damaged WMR with the standard control algorithm.


2021 ◽  
Author(s):  
Jason Yeung

This thesis describes the design and testing of a videoconferencing system for supporting the academic and social needs of hospitalized high school students. The underlying technologies of PEBBLES (Providing Education by Bringing Learning Environments to Students) were incorporated into the High School PEBBLES Prototype (HSPP) with new functionality such as application sharing and a whiteboard. Laboratory studies were conducted with four groups of high school students in a simulated classroom/hospital environment, assigning them a storyboarding task that encouraged use of the prototype's videoconferencing and application sharing features. The results indicated that the students could work collaboratively through the HSPP, and the students were able to experience presence. Some of the critical requirements for effective presence through videoconferencing were identified. The systems development approach used in this thesis highlights the value of intelligent modeling of systems in order to meet the specific requirements of the users.


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