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Spacecraft thruster control allocation problems
IEEE Transactions on Automatic Control, 2005We consider the control allocation problem in a spacecraft thruster configuration. It consists on the determination of the force command to be sent to each thruster in order to point the total torque and/or thrust vectors. Here, we state four possible practical problems and propose a control allocation algorithm based on a subgradient optimization ...
Pablo A. Servidia +1 more
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A reconfigurable Direct Control Allocation method
2013 European Control Conference (ECC), 2013In the event of failure of actuators in an overactuated system a reconfigurable law is required to redistribute and coordinate the control effort among the remaining healthy actuators. In this paper, a modified lookup table based Direct Control Allocation method is proposed for reconfiguration of actuator command, for a single actuator fault, without ...
Asim Kumar Naskar +2 more
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Safe and High-Performance Control Allocation
IEEE Transactions on Automatic Control, 2022This paper focuses on the control of nonlinear systems with redundant actuation, where the number of actuators is higher than the controllable degrees of freedom. To effectively handle actuation redundancy, we propose a control allocation (CA) approach that combines numerical optimization methods with control Lyapunov and control barrier functions. The
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Controlled trials: allocation concealment, random allocation, and blinding
BMJ, 2015The efficacy of nicotine patches in pregnant women who smoke was investigated using a randomised placebo controlled trial. The intervention was the administration of 16 hour nicotine patches until the time of delivery. Participants were 402 pregnant women older than 18 years who smoked at least five cigarettes a day and whose babies were between 12 and
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Guidance, Navigation, and Control Conference and Exhibit, 1998
The control allocation problem is defined in terms of solving or approximately solving a system of linear equations subject to constraints for redundant actuator control variable commands. There is one equation for each controlled axis. The constraints arise from actuation rate and position limits.
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The control allocation problem is defined in terms of solving or approximately solving a system of linear equations subject to constraints for redundant actuator control variable commands. There is one equation for each controlled axis. The constraints arise from actuation rate and position limits.
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Observer-based nonlinear control allocation
Proceedings of the 2010 American Control Conference, 2010In this paper, a Lyapunov-based approach is proposed for control allocation problem based on output feedback and model reference control. A nonlinear observer design approach for a general class of nonlinear systems is used to estimate the unmeasurable system states.
Fang Liao, Kai-Yew Lum, Jian Liang Wang
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A hierarchical control architecture for resource allocation
2012 12th International Conference on Control Automation Robotics & Vision (ICARCV), 2012Complex systems consist of a large number of entities with their independent local rules and goals, along with their interactions. In the operations of complex system, such as naval ship, proper decisions and controls are required to keep the system working functionally and effectively.
Yongchang Li, Dimitri Mavris
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Constrained control allocation
Astrodynamics Conference, 1992This paper addresses the problem of the allocation of several airplane flight controls to the generation of specified body-axis moments. The number of controls is greater than the number of moments being controlled, and the ranges of the controls are constrained to certain limits.
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A nonlinear programming approach for control allocation
Proceedings of the 2004 American Control Conference, 2004A novel nonlinear programming based control allocation scheme is developed. The performance of this nonlinear control allocation algorithm is compared with that of other control allocation approaches, including a mixed optimization scheme, a redistributed pseudo-inverse approach, and a direct allocation (geometric) method.
Vishnu L. Poonamallee +3 more
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Control allocation-based adaptive control for greenhouse climate
International Journal of Systems Science, 2018ABSTRACTThis paper presents an adaptive approach to greenhouse climate control, as part of an integrated control and management system for greenhouse production.
Yuanping Su, Lihong Xu, Erik D. Goodman
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