Hydrodynamic damped pitch motion of tension leg platforms

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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

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