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Title: Control method for physical systems and devices

A control method for stabilizing systems or devices that are outside the control domain of a linear controller is provided. When applied to nonlinear systems, the effectiveness of this method depends upon the size of the domain of stability that is produced for the stabilized equilibrium. If this domain is small compared to the accuracy of measurements or the size of disturbances within the system, then the linear controller is likely to fail within a short period. Failure of the system or device can be catastrophic: the system or device can wander far from the desired equilibrium. The method of the invention presents a general procedure to recapture the stability of a linear controller, when the trajectory of a system or device leaves its region of stability. By using a hybrid strategy based upon discrete switching events within the state space of the system or device, the system or device will return from a much larger domain to the region of stability utilized by the linear controller. The control procedure is robust and remains effective under large classes of perturbations of a given underlying system or device.
Inventors:
 [1]
  1. (Ithaca, NY)
Issue Date:
OSTI Identifier:
871065
Assignee:
Cornell Research Foundation, Inc. (Ithaca, NY) CHO
Patent Number(s):
US 5650927
Contract Number:
FG02-93ER25164
Research Org:
CORNELL UNIVERSITY
Country of Publication:
United States
Language:
English
Subject:
control; method; physical; systems; devices; stabilizing; outside; domain; linear; controller; provided; applied; nonlinear; effectiveness; depends; size; stability; produced; stabilized; equilibrium; compared; accuracy; measurements; disturbances; fail; period; failure; device; catastrophic; wander; desired; procedure; recapture; trajectory; leaves; region; hybrid; strategy; based; discrete; switching; events; space; return; larger; utilized; robust; remains; effective; perturbations; underlying; physical systems; control method; discrete switching; nonlinear systems; /700/

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