Model Validation and Performance Evaluation for the Multi-Tethered Aerostat Subsystem of the Large Adaptive Reflector

Chapter

Abstract

The Canadian design for the Square Kilometre Array radio telescope includes a large multi-tethered aerostat to support the telescope’s receiver. To validate this design concept, two parallel tracks have been undertaken: a numerical simulation of the multi-tethered aerostat system has been assembled, and a one-third scale prototype of the system has been constructed. This paper describes the experimental facility, presents results from initial tests of the uncontrolled system and compares these results to the predictions of the computer model of the system. Generally, the results compare very favourably. Using the simulation, we arrive at two important design philosophies to be used in the design of the full-scale system: (a) perturbations on the confluence point should be minimized, and (b) the system stiffness should be maximized to ensure minimum response to disturbances.

Keywords

SKA radio telescope tethered aerostat feed positioning 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bonev, I.: 2004, ‘Parallemic-The Parallel Mechanisms Information Center web site’, http://www.parallemic.org/WhosWho/CompSims.html.Google Scholar
  2. Fitzsimmons, J.T., Veidt, B. and Dewdney, P.: 2000, Proc. SPIE 4015, 476–487.ADSCrossRefGoogle Scholar
  3. Govardhan, R. and Williamson, C.: 1997, J. Wind Eng. Ind. Aerodyn. 69-71, 375–385.CrossRefGoogle Scholar
  4. Lambert, C. and Nahon, M.: 2003, AIAA J. Aircraft 40, 705–715.CrossRefGoogle Scholar
  5. Lambert, C., Saunders, A., Crawford, C. and Nahon, M.: 2003, ‘Design of a One-Third Scale Multi-Tethered Aerostat System for Precise Positioning of a Radio Telescope Receiver’, in CASI Flight Mechanics and Operations Symposium, Montreal, Canada.Google Scholar
  6. Massey, B.: 1989, Mechanics of Fluids, 6th Edn., Van Nostrand Reinhold, London.Google Scholar
  7. Nahon, M., Gilardi, G. and Lambert, C.: 2002, AIAA J. Guid. Control Dyn. 25, 1107–1115.CrossRefGoogle Scholar
  8. Press, W.H., Teukolsky, S.A., Vetterling, W.T. and Flannery, B.P.: 1992, Numerical Recipes in C: The Art of Scientific Computing, Cambridge University Press, New York.Google Scholar

Copyright information

© Springer 2005

Authors and Affiliations

  • Meyer Nahon
    • 1
  • Casey Lambert
    • 1
  • Dean Chalmers
    • 1
  • Wen Bo
    • 1
  1. 1.Department of Mechanical EngineeringMcGill UniversityMontrealCanada

Personalised recommendations