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Wind and Structures
  Volume 32, Number 4, April 2021 , pages 341-354
DOI: https://doi.org/10.12989/was.2021.32.4.341
 


Aerodynamic and hydrodynamic force simulation for the dynamics of double-pendulum articulated offshore tower
Mohd Moonis Zaheer and Nazrul Islam

 
Abstract
    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.
 
Key Words
    multi-point wind field; dynamic analysis; double pendulum articulated tower; wind-induced response; offshore
 
Address
Mohd Moonis Zaheer:Department of Civil Engineering, Zakir Hussain College of Engineering and Technology, AMU Aligarh-202002, India

Nazrul Islam:Department of Civil Engineering, Jamia Millia Islamia, New Delhi, India
 

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