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Frequency domain analysis of Froude-Krylov and diffraction forces on TLP Ebrahim Malayjerdy, Mohammad Reza Tabeshpour Ocean Systems Engineering منبع دانلود Tabeshpour_Frequency-domain-analysis-of-Frude-Krylov.pdf

Hydrodynamic damped pitch motion of tension leg platforms 1M. R. Tabeshpour; 2B. Ataie Ashtiani; 3M. S. Seif; 2A. A. Golafshani 1 Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles, Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran 2 Civil Engineering Department, Sharif University of Technology, Tehran, Iran 3 Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran Received 5 February 2013; revised 2 March 2013; accepted 27 March 2013 ABSTRACT: Because of fluctuation in leg tension, pitch motion is very effective fatigue and life safety of leg elements in tension leg structures (TLSs). In this paper an exact solution for pitch vibration of a TLS interacting with ocean wave is presented. The legs of TLP are considered as elastic springs. The flow is assumed to be irrotational and single-valued velocity potentials are defined. The effects of radiation and scattering are considered in the boundary value problem. Because of linear behavior of legs during wave excitation, ignoring coupling effects with other degrees of freedom, the analytical solution of pitch response has good agreement with the real behavior of the structure. Keywords:Hydrodynamic; Tension Leg Structure (TLS); Pitch; Wave; Radiation; Scattering دانلود Tabeshpour_..._Hydrodynamic-damped_2013.pdf