DOI QR코드

DOI QR Code

Identification of flutter derivatives of bridge decks using CFD-based discrete-time aerodynamic models

  • Zhu, Zhiwen (Center of Wind Engineering, Hunan University) ;
  • Gu, Ming (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University)
  • 투고 : 2011.04.22
  • 심사 : 2013.10.13
  • 발행 : 2014.03.25

초록

This paper presents a method to extract flutter derivatives of bridge decks based on a combination of the computational fluid dynamics (CFD), system simulations and system identifications. The incompressible solver adopts an Arbitrary Lagrangian-Eulerian (ALE) formulation with the finite volume discretization in space. The imposed sectional motion in heaving or pitching relies on exponential time series as input, with aerodynamic forces time histories acting on the section evaluated as output. System identifications are carried out to fit coefficients of the inputs and outputs of ARMA models, as to establish discrete-time aerodynamic models. System simulations of the established models are then performed as to obtain the lift and moment exerting on the sections to a sinusoidal displacement. It follows that flutter derivatives are identified. The present approaches are applied to a hexagon thin plate and a real bridge deck. The results are compared to the Theodorsen closed-form solution and those from wind tunnel tests. Satisfactory agreements are observed.

키워드

과제정보

연구 과제 주관 기관 : China Natural Science Foundation

참고문헌

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피인용 문헌

  1. Bridge deck flutter derivatives: Efficient numerical evaluation exploiting their interdependence vol.136, 2015, https://doi.org/10.1016/j.jweia.2014.11.006
  2. Examination of experimental errors in Scanlan derivatives of a closed-box bridge deck vol.26, pp.4, 2014, https://doi.org/10.12989/was.2018.26.4.231
  3. A novel long short-term memory neural-network-based self-excited force model of limit cycle oscillations of nonlinear flutter for various aerodynamic configurations vol.100, pp.3, 2014, https://doi.org/10.1007/s11071-020-05631-5