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논문 기본 정보

자료유형
학술저널
저자정보
Cao, Bochao (12271 Howe Hall, Department of Aerospace Engineering, Iowa State University) Sarkar, Partha P. (12271 Howe Hall, Department of Aerospace Engineering, Iowa State University)
저널정보
테크노프레스 Wind & structures Wind & structures 제16권 제6호
발행연도
2013.1
수록면
561 - 577 (17page)

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초록· 키워드

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Rational Functions are used to express the self-excited aerodynamic forces acting on a flexible structure for use in time-domain flutter analysis. The Rational Function Approximation (RFA) approach involves obtaining of these Rational Functions from the frequency-dependent flutter derivatives by using an approximation. In the past, an algorithm was developed to directly extract these Rational Functions from wind tunnel section model tests in free vibration. In this paper, an algorithm is presented for direct extraction of these Rational Functions from section model tests in forced vibration. The motivation for using forced-vibration method came from the potential use of these Rational Functions to predict aerodynamic loads and response of flexible structures at high wind speeds and in turbulent wind environment. Numerical tests were performed to verify the robustness and performance of the algorithm under different noise levels that are expected in wind tunnel data. Wind tunnel tests in one degree-of-freedom (vertical/torsional) forced vibration were performed on a streamlined bridge deck section model whose Rational Functions were compared with those obtained by free vibration for the same model.

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