Modeling and Analysis of Helicopter Ground Resonance Utilizing Symbolic Processing and Dynamic Simulation Software

Abstract

This thesis develops a technique for formulating the full nonlinear equations of motion for a coupled rotor-fuselage system utilizing the symbolic processing software MAPLE(registered). The symbolic software is further utilized to automatically convert the equations of motion into C, Fortran or MATLAB(registered) source code formatted specifically for numerical integration. The compiled source code can be accessed and numerically integrated by the dynamic simulation software SIMULINK(registered). SIMULINK(registered) is utilized to generate time history plots of blade and fuselage motion. These time traces can be used to explore the effects of damping nonlinearities, structural nonlinearities, active control, individual blade control, and damper failure on ground resonance. In addition, a MATLAB(registered) program was developed to apply the Moving Block Technique for determining modal damping of the rotor-fuselage system from the time marching solutions.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1997
Accession Number
ADA331773

Entities

People

  • Christopher S. Robinson

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Aircrafts
  • Airframes
  • Algorithms
  • Computational Science
  • Computer Programming
  • Computer Programs
  • Differential Equations
  • Equations
  • Equations Of Motion
  • Fuselages
  • Helicopters
  • Mathematical Programming
  • Numerical Integration
  • Power Spectra
  • Rotary Wing Aircraft
  • Simulations

Fields of Study

  • Engineering
  • Physics

Readers

  • Aerodynamics.
  • Computational Modeling and Simulation
  • Control Systems Engineering.