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DYNAMIC ANALYSIS OF A HELICOPTER ROTOR BY DYMORE PROGRAM

  • Vedat Doğan
  • Mesut Kırca
Conference paper
  • 1.3k Downloads
Part of the Springer Proceedings in Physics book series (SPPHY, volume 111)

Abstract

The dynamic behavior of hingeless and bearingless blades of a light commercial helicopter which has been under design process at ITU (İstanbul Technical University, Rotorcraft Research and Development Centre) is investigated. Since the helicopter rotor consists of several parts connected to each other by joints and hinges; rotors in general can be considered as an assembly of the rigid and elastic parts. Dynamics of rotor system in rotation is complicated due to coupling of elastic forces (bending, torsion and tension), inertial forces, control and aerodynamic forces on the rotor blades. In this study, the dynamic behavior of the rotor for a real helicopter design project is analyzed by using DYMORE. Blades are modeled as elastic beams, hub as a rigid body, torque tubes as rigid bodies, control links as rigid bodies plus springs and several joints. Geometric and material cross-sectional properties of blades (Stiffness-Matrix and Mass-Matrix) are calculated by using VABS programs on a CATIA model. Natural frequencies and natural modes of the rotating (and non-rotating) blades are obtained by using DYMORE. Fan-Plots which show the variation of the natural frequencies for different modes (Lead-Lag, Flapping, Feathering, etc.) vs. rotor RPM are presented.

Keywords

Rigid Body Rotor System Rotor Blade Aerodynamic Force CATIA Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bauchaou O. A. DYMORE: User's Manual and Theory Manual.Google Scholar
  2. Chopra, Inderjit. Helicopter Dynamics, University of Maryland, Center for Rotorcraft Education and Research.Google Scholar
  3. Hanson T. F. (1998) Designer Friendly Handbook of Helicopter Rotor Hubs.Google Scholar
  4. Mil M. L., et al. (1967) Helicopter Calculation and Design, Volume 2- Vibrations and Dynamic Stability, Moscow.Google Scholar
  5. Schindler R., Pfisterer. Impacts of Rotor Hub Design Criteria on the Operational Capabilities of Rotorcraft, AGARD-CP-354.Google Scholar

Copyright information

© Springer 2006

Authors and Affiliations

  • Vedat Doğan
    • 1
  • Mesut Kırca
    • 1
  1. 1.Faculty of Aeronautics and Astronautics, Rotorcraft Research and Development Centreİstanbul Technical UniversityİstanbulTurkey

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