Accession Number : ADA130476

Title :   Aeroelastic Response of an Aircraft Wing to Random Loads (Reponse Aeroelastique d'une Aile D'Aeronef a des Charges Aleatoires).

Descriptive Note : Aeronautical rept.,

Corporate Author : NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO) HIGH SPEED AERODYNAMICS LAB

Personal Author(s) : Lee,B H K

PDF Url : ADA130476

Report Date : Apr 1983

Pagination or Media Count : 60

Abstract : A method for the prediction of the response of an elastic wing to random loads at flight conditions using rigid model wind tunnel pressure fluctuation measurements is presented. The wing is divided into panels or elements, and the load is computed from measured pressure fluctuations at the centre of each panel. A series representation with terms of the correlated noise type is used to curve fit the experimentally determined pressure power spectra. Two methods are used to calculate the random load spectrum: a constant correlation approximation, and an exponential spatially decaying cross-power spectrum model for the pressure. The coupling between the structural dynamics and aerodynamics of a vibrating wing is taken into consideration using the doublet-lattice method for computing the unsteady aerodynamic forces. The acceleration and displacement response spectra have been computed for the F-4E aircraft for various Mach numbers, dynamic pressures and flight altitudes. The importance of the unsteady aerodynamic loads induced by the vibration of the wing and input load representation is illustrated by comparing the theoretical predictions with results from flight tests. (Author)

Descriptors :   *Aeroelasticity, *Supercritical wings, *Elastic properties, Aerodynamic forces, Aerodynamic loading, Vibration, Predictions, Methodology, Numerical methods and procedures, Wind tunnel models, Wind tunnel tests, Foreign technology, Canada

Subject Categories : Aerodynamics
      Numerical Mathematics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE