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Computer optimization techniques for NASA Langley's CSI evolutionary model's real-time control system

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[唯一标识符]:CDSITC.AEROSPACE.N92-19664
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:N1992-19664; Reference AN: N92-19664
[标题]:Computer optimization techniques for NASA Langley's CSI evolutionary model's real-time control system
[作者]:ELLIOTT KENNY B; UGOLETTI ROBERTO; SULLA JEFF
[文摘]:The evolution and optimization of a real-time digital control system is presented. The control system is part of a testbed used to perform focused technology research on the interactions of spacecraft platform and instrument controllers with the flexible-body dynamics of the platform and platform appendages. The control system consists of Computer Automated Measurement and Control (CAMAC) standard data acquisition equipment interfaced to a workstation computer. The goal of this work is to optimize the control system's performance to support controls research using controllers with up to 50 states and frame rates above 200 Hz. The original system could support a 16-state controller operating at a rate of 150 Hz. By using simple yet effective software improvements, Input/Output (I/O) latencies and contention problems are reduced or eliminated in the control system. The final configuration can support a 16-state controller operating at 475 Hz. Effectively the control system's performance was increased by a factor of 3. (Author)
[关键词]:AUTOMATIC CONTROL; COMPUTER TECHNIQUES; CONTROL SYSTEMS DESIGN; CONTROLLERS ; DATA ACQUISITION; NUMERICAL CONTROL; REAL TIME OPERATION; CONTROL THEORY; DIGITAL SYSTEMS; FLEXIBLE BODIES; SPACE PLATFORMS; SPACECRAFT INSTRUMENTS
[出版年份]:1992
[专业领域]:STRUCTURAL MECHANICS
[文献类型]:科技报告
[标题]:Development of Fixed Two-Way Restrictor Valves for Use on Military Aircraft.
[作者]:vick,ralph l.
[机构]:Wright Air Development Center Wright-Patterson AFB Oh
[关键词]:hydraulic valves,aircraft equipment,orifices,incompressible flow,hydraulic fluid filters,particles,dynamic pressure,viscosity,restrictor valves,ntisdodxa
[出版年份]:1980
[报告号]:Rept no. WADC-TR-52-153
[报告时间]:Jul 52,
[页码]:63p
[馆藏索取号]:AD-A075983
[总页数]:62


[唯一标识符]:CDSITC.AEROSPACE.A97-22059
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:A1997-22059; Reference AN: A97-22059
[标题]:Small scale intermittency and the renormalization group
[作者]:Kuz'min G A
[书名]:IN: Advances in turbulence VI; Proceedings of the 6th European Turbulence Conference, Lausanne, Switzerland, July 2-5, 1996 (A97-22001 05-34), Dordrecht, Netherlands, Kluwer Academic Publishers (Fluid Mechanics and Its Applications. Vol. 36), 1996, p. 243
[文摘]:Consideration is given to the scaling hypothesis for nonintermittent multiplicative noise and an application of the renormalization group technique to obtain statistics on it. In the present model, the motion is excited by the parametric noise. In the zeroth approximation the viscous term is balanced by the parametric term. (AIAA)
[关键词]:TURBULENT FLOW; RENORMALIZATION GROUP METHODS; SCALING LAWS; KOLMOGOROV THEORY; LANGEVIN FORMULA; VISCOUS FLOW; SPATIAL DISTRIBUTION; NONLINEAR EQUATIONS
[出版年份]:1996
[专业领域]:FLUID MECHANICS AND HEAT TRANSFER