Analysis of Modal Behavior at Frequency Cross-Over.

Abstract

The existence of the mode crossing condition is detected and analyzed in the Active Control of Space Structures Model 4 (ACOSS4). The condition is studied for its contribution to the inability of previous algorithms to successfully optimize the structure and converge to a feasible solution. A new algorithm is developed to detect and correct for mode crossings. The existence of the mode crossing condition is verified in ACOSS4 and found not to have appreciably affected the solution. The structure is then successfully optimized using new analytic methods based on modal expansion. An unrelated error in the optimization algorithm previously used is verified and corrected, thereby equipping the optimization algorithm with a second analytic method for eigenvector differentiation based on Nelson's Method. The second structure is the Control of Flexible Structures (COFS). The COFS structure is successfully reproduced and an initial eigenanalysis completed.

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Document Details

Document Type
Technical Report
Publication Date
Nov 28, 1994
Accession Number
ADA289304

Entities

People

  • Robert N. Costa Jr

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Sensors
  • Space

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  • Artificial Satellites
  • Computational Science
  • Computer Programming
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  • Control Systems Engineering
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  • Linear Programming
  • Literature Surveys
  • Mathematical Models
  • Mechanics
  • Multiobjective Optimization
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  • Space Systems
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Approximation Theory.
  • Robotics and Automation.
  • Theoretical Analysis.

Technology Areas

  • Space
  • Space - Spacecraft Maneuvers