Data processing: structural design – modeling – simulation – and em – Simulating electronic device or electrical system
Reexamination Certificate
2006-11-07
2006-11-07
Nguyen, Cuong (Department: 3661)
Data processing: structural design, modeling, simulation, and em
Simulating electronic device or electrical system
C703S003000
Reexamination Certificate
active
07133815
ABSTRACT:
In the control of spacecraft, thrusters must generate a commanded force or torque that is computed from the control algorithms in order to maintain a certain attitude or orbit. In general, there is an infinite number of solutions as to how the thrusters are fired in order to achieve the commanded value. However, additional imposed constraints on the mass flow allow only a small subset of those solutions to be feasible. By way of example, two constraints are considered in this invention: first, the mass flow of each thruster must exceed a minimum value and second, the total mass flow of all thrusters for any generated force/torque must be constant. If only a non-feasible solution is found, known methods turn it into a feasible one by reducing the commanded force/torque until the constraints are met. Reducing the commanded force/torque is, however, a disadvantage because the performance may decrease and even lead to instability of the closed loop system. This invention concerns a simple and time efficient method/system for improving an unfeasible solution in such a way that reducing the commanded force/torque can be minimised or even completely be avoided and, therefore, higher feasible generated forces/torques than those with known methods can be generated.
REFERENCES:
patent: 3917929 (1975-11-01), Reinhart
patent: 4837699 (1989-06-01), Smay et al.
patent: 5130931 (1992-07-01), Paluszek et al.
patent: 5310143 (1994-05-01), Yocum et al.
patent: 5335179 (1994-08-01), Boka et al.
patent: 5349532 (1994-09-01), Tilley et al.
patent: 5850992 (1998-12-01), Flament et al.
patent: 5884869 (1999-03-01), Fowell et al.
patent: 6141606 (2000-10-01), Reckdahl
patent: 6205387 (2001-03-01), Ochiai
patent: 6330483 (2001-12-01), Dailey
patent: 6341749 (2002-01-01), Ocampo
patent: 6347262 (2002-02-01), Smay et al.
patent: 6463365 (2002-10-01), Anagnost et al.
patent: 6786896 (2004-09-01), Madhani et al.
patent: 6937968 (2005-08-01), Carrico et al.
patent: 2 268 138 (1994-01-01), None
patent: 2268138 (1994-01-01), None
Kang et al., On compensating nonlinear distortions of an OFDM system using an efficient adaptive predistorter, IEEE Trans. on Comm. vol. 47, No. 4, Apr. 1999 (5 pages).
Mason A Peck, Control-moment gyroscopes for joint actuation: a new paradigm in space robotics, American Institute of Aeronautics and Astronatics, pp. 1-31.
Sarkar et al., Coordinated motion planning and control of autonomous underwater vehicle-manipulator systems subject to drag optimization, IEEE Jour. of Oceanic Engineering, vol. 26, No. 2, Apr. 2001.
Zentgraf, and Chapman et al., Drag-free control analysis and algorithm design for the STEP mission, ESA/ESTEC contract 15139/01/NL/HB.
Astrium Limited
Crowell & Moring LLP
Nguyen Cuong
LandOfFree
Method and system for balancing thrust demands does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for balancing thrust demands, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for balancing thrust demands will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3690091