Wind and Structures

  • 제32권4호
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  • Pages.341-354
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  • 2021
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

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Aerodynamic and hydrodynamic force simulation for the dynamics of double-pendulum articulated offshore tower

  • Zaheer, Mohd Moonis (Department of Civil Engineering, Zakir Hussain College of Engineering and Technology) ;
  • Islam, Nazrul (Department of Civil Engineering, Jamia Millia Islamia)
  • 투고 : 2020.09.09
  • 심사 : 2021.03.07
  • 발행 : 2021.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Articulated towers are one of the class of compliant offshore structures that freely oscillates with wind and waves, as they are designed to have low natural frequency than ocean waves. The present study deals with the dynamic response of a double-pendulum articulated tower under hydrodynamic and aerodynamic loads. The wind field is simulated by two approaches, namely, single-point and multiple-point. Nonlinearities such as instantaneous tower orientation, variable added mass, fluctuating buoyancy, and geometrical nonlinearities are duly considered in the analysis. Hamilton's principle is used to derive the nonlinear equations of motion (EOM). The EOM is solved in the time domain by using the Wilson-θ method. The maximum, minimum, mean, and standard deviation and salient power spectral density functions (PSDF) of deck displacement, bending moment, and central hinge shear are drawn for high and moderate sea states. The outcome of the analyses shows that tower response under multiple-point wind-field simulation results in lower responses when compared to that of single-point simulation.

키워드

참고문헌

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