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Title: The Development of a Control System for a 5 Kilowatt Free Piston Stirling Space Convertor

Abstract

The new NASA Vision for Exploration, announced by President Bush in January 2004, proposes an ambitious program that plans to return astronauts to the moon by the 2018 time frame. A recent NASA study entitled 'Affordable Fission Surface Power Study' recommended a 40 kWe, 900 K, NaK-cooled, Stirling conversion for 2020 launch. Use of two of the nominal 5 kW converters allows the system to be dynamically balanced. A group of four dual-converter combinations that would yield 40 kWe can be tested to validate the viability of Stirling technology for space fission surface power systems. The work described in this paper deals specifically with the control system for the 5 kW convertor described in the preceding paragraph. This control system is responsible for maintaining piston stroke to a setpoint in the presence of various disturbances including electrical load variations. Pulse starting of the FSPE convertor is also an inherent part of such a control system. Finally, the ability to throttle the engine to match the required output power is discussed in terms of setpoint control. Several novel ideas have been incorporated into the piston stroke control strategy that will engender a stable response to disturbances in the presence of midpointmore » drift while providing useful data regarding the position of both the power piston and displacer.« less

Authors:
 [1];  [2]
  1. Space Research Institute, 231 Leach Center, Auburn University, Auburn University, AL, USA 36849-5320 (United States)
  2. Foster-Miller, Inc., 431 New Karner Rd., Albany, NY, USA 12205 (United States)
Publication Date:
OSTI Identifier:
21049467
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 969; Journal Issue: 1; Conference: Space Technology and Applications International Forum-STAIF 2008: 12. conference on thermophysics applications in microgravity; 1. symposium on space resource utilization; 25. symposium on space nuclear power and propulsion; 6. conference on human/robotic technology and the vision for space exploration; 6. symposium on space colonization; 5. symposium on new frontiers and future concept, Albuquerque, NM (United States), 10-14 Feb 2008; Other Information: DOI: 10.1063/1.2844988; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; CONTROL SYSTEMS; ENERGY CONVERSION; FISSION; MOON; NASA; PISTONS; POTASSIUM ALLOYS; POWER GENERATION; POWER SYSTEMS; SODIUM ALLOYS; STIRLING ENGINES

Citation Formats

Kirby, Raymond L, and Vitale, N. The Development of a Control System for a 5 Kilowatt Free Piston Stirling Space Convertor. United States: N. p., 2008. Web. doi:10.1063/1.2844988.
Kirby, Raymond L, & Vitale, N. The Development of a Control System for a 5 Kilowatt Free Piston Stirling Space Convertor. United States. https://doi.org/10.1063/1.2844988
Kirby, Raymond L, and Vitale, N. 2008. "The Development of a Control System for a 5 Kilowatt Free Piston Stirling Space Convertor". United States. https://doi.org/10.1063/1.2844988.
@article{osti_21049467,
title = {The Development of a Control System for a 5 Kilowatt Free Piston Stirling Space Convertor},
author = {Kirby, Raymond L and Vitale, N},
abstractNote = {The new NASA Vision for Exploration, announced by President Bush in January 2004, proposes an ambitious program that plans to return astronauts to the moon by the 2018 time frame. A recent NASA study entitled 'Affordable Fission Surface Power Study' recommended a 40 kWe, 900 K, NaK-cooled, Stirling conversion for 2020 launch. Use of two of the nominal 5 kW converters allows the system to be dynamically balanced. A group of four dual-converter combinations that would yield 40 kWe can be tested to validate the viability of Stirling technology for space fission surface power systems. The work described in this paper deals specifically with the control system for the 5 kW convertor described in the preceding paragraph. This control system is responsible for maintaining piston stroke to a setpoint in the presence of various disturbances including electrical load variations. Pulse starting of the FSPE convertor is also an inherent part of such a control system. Finally, the ability to throttle the engine to match the required output power is discussed in terms of setpoint control. Several novel ideas have been incorporated into the piston stroke control strategy that will engender a stable response to disturbances in the presence of midpoint drift while providing useful data regarding the position of both the power piston and displacer.},
doi = {10.1063/1.2844988},
url = {https://www.osti.gov/biblio/21049467}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 969,
place = {United States},
year = {Mon Jan 21 00:00:00 EST 2008},
month = {Mon Jan 21 00:00:00 EST 2008}
}