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Structural Optimization of Elastic Articulation Rotor System for Dynamic Stability

[+] Author Affiliations
Jieun Ku, Daniel P. Schrage

Georgia Institute of Technology, Atlanta, GA

Paper No. ESDA2006-95416, pp. 531-540; 10 pages
  • ASME 8th Biennial Conference on Engineering Systems Design and Analysis
  • Volume 1: Advanced Energy Systems, Advanced Materials, Aerospace, Automation and Robotics, Noise Control and Acoustics, and Systems Engineering
  • Torino, Italy, July 4–7, 2006
  • ISBN: 0-7918-4248-7 | eISBN: 0-7918-3779-3
  • Copyright © 2006 by ASME


Multilevel optimization methodology is implied on Elastic Articulation (EA) rotor system to find the global and local configuration to ensure the dynamic stability with Autorotation Index (AI) consideration. EA rotor is the rotor system of generic Georgia Tech Helicopter (GTH) and it is soft-in-plane with 10% effective flapping hinge offset and forward sweep angle. Also, EA rotor has the beneficial features such as flexure beams and torque tube that eliminate dampers and hinges that lead to the its simplicity, structural safety, and reduced weight. To ensure the dynamic stability of such superior system, the methodology utilizes the high-fidelity structural beam analysis tools, DYMORE and VABS that reduce the computation time by allowing a hierarchical decomposition of the problem that separates the local (cross-sectional) sub-problem from the global optimization. The procedure is implemented using MATLAB as the overall optimizer. The results showed that the system achieved optimum values through iteration, however, sensitivity analysis is needed.

Copyright © 2006 by ASME



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