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  • Other Sources  (8)
  • 1990-1994  (6)
  • 1970-1974  (2)
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  • 1
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    Methods for utilizing maximum power from a solar array (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: A preliminary study of maximum power utilization methods was performed for an outer planet spacecraft using an ion thruster propulsion system and a solar array as the primary energy source. The problems which arise from operating the array at or near the maximum power point of its 1-V characteristic are discussed. Two closed loop system configurations which use extremum regulators to track the array's maximum power point are presented. Three open loop systems are presented that either: (1) measure the maximum power of each array section and compute the total array power, (2) utilize a reference array to predict the characteristics of the solar array, or (3) utilize impedance measurements to predict the maximum power utilization. The advantages and disadvantages of each system are discussed and recommendations for further development are made.
    Keywords: AUXILIARY SYSTEMS
    Type: JPL Quarterly Tech. Rev., Vol. 2, No. 1; p 37-48
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Collaborative engineering-design support system (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Designing engineering objects requires many engineers' knowledge from different domains. There needs to be cooperative work among engineering designers to complete a design. Revisions of a design are time consuming, especially if designers work at a distance and with different design description formats. In order to reduce the design cycle, there needs to be a sharable design describing the engineering community, which can be electronically transportable. Design is a process of integrating that is not easy to define definitively. This paper presents Design Script which is a generic engineering design knowledge representation scheme that can be applied in any engineering domain. The Design Script is developed through encapsulation of common design activities and basic design components based on problem decomposition. It is implemented using CLIPS with a Windows NT graphical user interface. The physical relationships between engineering objects and their subparts can be constructed in a hierarchical manner. The same design process is repeatedly applied at each given level of hierarchy and recursively into lower levels of the hierarchy. Each class of the structure can be represented using the Design Script.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Johnson Space Center, Third CLIPS Conference Proceedings, Volume 2; p 285-295
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Multichip MMIC Package for X and Ka-bands (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: This package provides space for mounting up to five MMIC chips and has three RF and five DC feed-throughs.
    Type: IEEE, International Microwave Interconnect and Packaging Technology Symposium; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Operation of high power converters in parallel (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Three different unequal power sharing approaches for parallel operation of converters - droop, master-slave, and proportional adjustment - are discussed. The approaches have been incorporated in the breadboard dc-dc converter units used in the space station power management and distribution dc test bed at the Lewis Research Center, where the system operation has been verified.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 6 (A93-25851 09-44); p. 6.49-6.53.
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Operation of high power converters in parallel (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: High power converters that are used in space power subsystems are limited in power handling capability due to component and thermal limitations. For applications, such as Space Station Freedom, where multi-kilowatts of power must be delivered to user loads, parallel operation of converters becomes an attractive option when considering overall power subsystem topologies. TRW developed three different unequal power sharing approaches for parallel operation of converters. These approaches, known as droop, master-slave, and proportional adjustment, are discussed and test results are presented.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-191096 , E-7685 , NAS 1.26:191096
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Multikilowatt power electronics development for spacecraft (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Attention is given to several multikilowatt power electronic components developed by TRW for the Space Station Power Management and Distribution test bed at NASA Lewis Research Center. These components include a 12.5-kW DC-DC converter, a 6.25-kW battery charge/discharge regulator, an 82-channel sequential shunt unit, a 10-A remote power controllers, and three different types of 1-kW load converters. TRW is also monitoring the development of 120-V fuses for space applications. The authors discuss these developments and provide steady-state and dynamic performance parameters.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Modeling polar cap F-region patches using time varying convection (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Creation of polar cap F-region patches are simulated for the first time using two independent physical models of the high latitude ionosphere. The patch formation is achieved by temporally varying the magnetospheric electric field (ionospheric convection) input to the models. The imposed convection variations are comparable to changes in the convection that result from changes in the B(y) IMF component for southward IMF. Solar maximum-winter simulations show that simple changes in the convection pattern lead to significant changes in the polar cap plasma structuring. Specifically, in winter, as enhanced dayside plasma convects into the polar cap to form the classic tongue-of-ionization the convection changes produce density structures that are indistinguishable from the observed patches.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 20; 17; p. 1783-1786.
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    AC impedance of silicon solar cells. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The equivalent source impedance of a solar array is an important parameter in the design and analysis of solar array power conditioning equipment. Laboratory impedance tests have been performed on individual silicon solar cells and the test results have been correlated with P-N junction theory as developed by Shockley. The impedance has been broken into resistive and reactive components. The impedance has been expressed as a function of DC operating point and frequency. A practical application of the individual cell characteristics is presented in a solar array simulator design.
    Keywords: AUXILIARY SYSTEMS
    Type: Intersociety Energy Conversion Engineering Conference; Energy 70; Sep 21, 1970 - Sep 25, 1970; Las Vegas, NV
    Format: text
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    NASA TECHNICAL REPORTS
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