Wind and Structures

  • 제24권5호
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  • Pages.481-500
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  • 2017
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A 3-DOF forced vibration system for time-domain aeroelastic parameter identification

  • Sauder, Heather Scot (CPP Wind Engineering) ;
  • Sarkar, Partha P. (Department of Aerospace Engineering, Iowa State University)
  • 투고 : 2016.11.20
  • 심사 : 2017.05.07
  • 발행 : 2017.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

A novel three-degree-of-freedom (DOF) forced vibration system has been developed for identification of aeroelastic (self-excited) load parameters used in time-domain response analysis of wind-excited flexible structures. This system is capable of forcing sinusoidal motions on a section model of a structure that is used in wind tunnel aeroelastic studies along all three degrees of freedom - along-wind, cross-wind, and torsional - simultaneously or in any combination thereof. It utilizes three linear actuators to force vibrations at a consistent frequency but varying amplitudes between the three. This system was designed to identify all the parameters, namely, aeroelastic- damping and stiffness that appear in self-excited (motion-dependent) load formulation either in time-domain (rational functions) or frequency-domain (flutter derivatives). Relatively large displacements (at low frequencies) can be generated by the system, if required. Results from three experiments, airfoil, streamlined bridge deck and a bluff-shaped bridge deck, are presented to demonstrate the functionality and robustness of the system and its applicability to multiple cross-section types. The system will allow routine identification of aeroelastic parameters through wind tunnel tests that can be used to predict response of flexible structures in extreme and transient wind conditions.

키워드

과제정보

연구 과제 주관 기관 : U.S. National Science Foundation

참고문헌

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피인용 문헌

  1. Nonparametric modeling of self-excited forces based on relations between flutter derivatives vol.31, pp.6, 2017, https://doi.org/10.12989/was.2020.31.6.561