Automated endurance testing of a Brayton power conversion system
Computer controlled durability test of 50,000 hour life Brayton power conversion system for space applications
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Computer controlled durability test of 50,000 hour life Brayton power conversion system for space applications
Design, development, and performance of 35 to 150 kilowatt Brayton power conversion module and application to nuclear reactor powered system
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Automated endurance testing of 2-15 kWe Brayton power conversion system, using rotating unit, heat exchanger, electronic voltage regulator, parasitic speed control
Brayton cycle power conversion system using He-Xe gas mixture, discussing compressor net engine and turbine static efficiencies
Electrical subsystem of 2-15 kW Brayton power conversion system consisting of speed controller, alternator voltage regulator, DC power supply, etc
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The Brayton rotating unit (BRU), consisting of a turbine, an alternator, and a compressor, was tested as part of a Brayton cycle power conversion system over a side range of steady state operating conditions. The working fluid in the system was a mixture of helium-xenon gases. Turbine inlet temperature was varied from 1200 to 1600 F, compressor inlet temperature from 60 to 120 F, compressor discharge pressure from 20 to 45 psia, rotative speed from 32 400 to 39 600 rpm, and alternator liquid-coolant flow rate from 0.01 to 0.27 pound per second. Test results indicated that the BRU internal temperatures were highly sensitive to alternator coolant flow below the design value of 0.12 pound per second but much less so at higher values. The armature winding temperature was not influenced significantly by turbine inlet temperature, but was sensitive, up to 20 F per kVA alternator output, to varying alternator output. When only the rotational speed was changed (+ or - 10% of rated value), the BRU internal temperatures varied directly with the speed.
Zero- and third-order digital-to-analog conversion techniques are described, and the theoretical error performances are compared. The design equations and procedures for constructing a third-order digital-to-analog converter by using analog design elements are presented. Both a zero- and a third-order digital-to-analog converter were built, and the performances are compared with various signal inputs.
Performance characteristics of electrical subsystem for 2 to 15 kilowatt Brayton power conversion system
A system has been developed which permits the determination of dose in real time or near real time directly from the pulse-height output of a radiation spectrometer. The technique involves the use of the resolution matrix of a spectrometer, the radiation energy-to-dose conversion function, and the geometrical factors, although the order of matrix operations is reversed. The new technique yields a result which is mathematically identical to the standard method while requiring no matrix manipulations or resolution matrix storage in the remote computer. It utilizes only a single function for each type dose required and each geometric factor involved.