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Computer-aided design of control systems to meet many requirementsA method is described for using nonlinear programing in the computer-aided design of airplane control systems. It is assumed that the quality of such systems depends on many criteria. These criteria are included in the constraints vector (instead of attempting to combine them into a single scalar criterion, as is usually done), and the design proceeds through a sequence of nonlinear programing solutions in which the designer varies the specification of sets of requirements levels. The method is applied to design of a lateral stability augmentation system (SAS) for a fighter airplane, in which the requirements vector is chosen from the official handling qualities specifications. Results are shown for several simple SAS configurations designed to obtain desirable handling qualities over all design flight conditions with minimum feedback gains. The choice of the final design for each case is not unique but depends on the designer's decision as to which achievable set of requirements levels represents the best for that system. Results indicate that it may be possible to design constant parameter SAS which can satisfy the most stringent handling qualities requirements for fighter airplanes in all flight conditions. The role of the designer as a decision maker, interacting with the computer program, is discussed. Advantages of this type of designer-computer interaction are emphasized. Desirable extensions of the method are indicated.
Document ID
19740023321
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Schy, A. A.
(NASA Langley Research Center Hampton, VA, United States)
Adams, W. M., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Johnson, K. G.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 7, 2013
Publication Date
May 1, 1974
Publication Information
Publication: AGARD Advan. in Control Systems
Subject Category
Aircraft
Accession Number
74N31434
Distribution Limits
Public
Copyright
Other
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