High speed computation of optimum controls. MATSUOKA, H. (Tokyo, University, Tokyo, Japan) IN: International Council o-f the Aeronautical Sciences, Congress, 14th, Toulouse, France, September 9-14, 1984, Proceedings. Volume? 1 (A84-44926 22-01). New York, American Institute of Aeronautics and Astronautics, 1984, p. 126-136. Language: English . Country o-f Origin: Japan. Country of Publication: United States Document Type: CONFERENCE PAPER Most documents available from AIAA Technical Library Journal Announcement: IAA8422 An optimal control process based on the Pontryagin maximum principle was shown by Neustadt (1963) to be solvable by an iterative procedure in the case of digital hybrid computers. The state space of the system is described by a linear system of ordinary differential equations. Optimization involves transferring the initial state to a target state, with the constraints of minimal transfer time and control effort. Ten different gain control techniques are examined for convergence acceleration in the case of a digital differential analyzer interfacing with a general purpose computer. The feasibility of rapid convergence for 2nd and 3rd order systems is demonstrated, although energy considerations are necessary for 2nd order systems. (M.S.K.) Source of Abstract (Subfile): AIAA/TIS Keywords: *DIFFERENTIAL ANALYZERS; ♦HYBRID COMPUTERS; ♦ITERATIVE SOLUTION; ♦OPTIMAL CONTROL; ♦PONTRYAGIN PRINCIPLE; ♦RUN TIME (COMPUTERS); ALGORITHMS; BOUNDARY VALUE PROBLEMS; CONVERGENCE; FEEDBACK CONTROL; REAL TIME OPERATION; STATE VECTORS Subject Classification: 7563 Cybernetics (1975-) GaAs IMPATT diodes for 60 GHz. ADLERSTEIN, M. G.; CHU, S. L. G. (Raytheon Co., Research Div., Lexington, MA) IEEE Electron Device Letters (ISSN 0741-3106), vol. EDL-5, March 1984, p. 97, 98. 6 Refs. Contract No.: F33615-81-C-1470 Language: English. Country of Origin: United States. Country of Publication: United States Document Type: JOURNAL ARTICLE Most documents available from AIAA Technical Library Journal Announcement: IAA8421 High-performance GaAs double-drift Read IMPATT diodes have been demonstrated at 60 GHz. 1.24-W CW output power at 11.4-percent de to RF conversion efficiency was obtained with a junction temperature rise of 225 C. The doping profiles and test circuits have not yet been optimized and we expect that still higher power and efficiency should be achievable. (Author ) Source of Abstract (Subfile): AIAA/TIS Keywords: ♦AVALANCHE DIODES; ♦ELECTRICAL IMPEDANCE; ♦ENERGY CONVERSION EFFICIENCY; ♦GALLIUM ARSENIDES; ♦MICROWAVE CIRCUITS; ADDITIVES; HEAT SINKS; MASS SPECTROMETERS; MOLECULAR BEAM EPITAXY
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