Mathematical Modeling of Linear and Non-Linear Aircraft Structures.
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
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The mathematical modeling of aircraft structures for instance by finite elements is used, from the very beginning of a design, to determine the flutter boundaries and the dynamics of the aircraft. Once the prototype is built, extensive vibration tests take place in order to compare the theoretical prediction with the actual natural modes and frequencies. Discrepancies then appear, especially for wing-store configurations, that must be explained and the mathematical model must be modified to fit the experimental results. The authors addressed two different aspects of the problem in their presentations at the Spring 1980 Meeting of the Structures and Materials Panel in Athens In his paper, Zimmermann proposes adjustment algorithms for improving the theoretically obtained flexibility and mass distributions of a structure by dynamic or ground resonance tests. On the other hand, De Ferrari, Chesta, Sensburg and Lotze deal with the non-linear behaviour of wing-store configurations and its analytical representation. They draw clear conclusions on the excitation amplitudes at which flutter could occur. The two papers provide a very important contribution to the understanding of some difficult aeroelastic problems and will be very useful to the NATO community.
- Military Aircraft Operations