Cited by 247Open Access
Shaheed Zulfiqar Ali Bhutto Institute of Science and Technology
ORCID: 0000-0001-9974-0188Publishes on Guidance and Control Systems, Adaptive Control of Nonlinear Systems, Genomics and Chromatin Dynamics. 13 papers and 275 citations.
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Many gun launched projectiles spin to maintain in-flight dynamic stability. This spinning often induces the gyroscopic phenomenon known as precession, or coning. Coning poses a problem for actively controlling the projectile. A control scheme is proposed that can compensate for the coning angle of the projectile and allow front-mounted canards to efficiently change the projectile flight path without reaching a stall condition. Closed-loop regulation and H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> control theories are employed to construct the controller.
Despinning the front end of a spinning flying munition is an important step towards flight control of said vehicle. A counter-rotation control scheme is proposed to despin and stabilize the front end of the vehicle at a definable still roll position with respect to earth. Classical and H∞ control theories are employed to construct the despin controller.
Actuator failure may severely affect the performance of mobile robots and vehicles. This study serves to evaluate how a mobile system responds under various actuator failure modes to determine appropriate methods to satisfy performance objectives. We evaluate a kinematically symmetric holonomic mobile robot while fully actuable (with no motor/wheel failures), as well as under actuator failure conditions. Closed-loop state feedback is applied to the system to observe performance and self-correction under both nominal and failure mode conditions, and resulting performance is evaluated. Observations of these conditions motivate the need to address failure modes within the controller architecture.
Abstract Ticks and the diseases they may transmit have gained attention in the last decades. Knowledge of their local distribution and the pathogens they may transmit are essential components to establish effective control measures. Concerns are raised on the proper identification of ticks, on the inappropriate method of reporting their presence, and on the consequences of using ill-founded datasets for predictive distribution and their impacts.