Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 10American Society of Mechanical Engineers, 1991 - Arctic regions |
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Page 507
... tether pre - tension is reduced , the wave- induced time - varying axial force becomes important in its dynamics and causes the tether to undergo parametric oscillations described by the Mathieu equation . Fortunately , in the case of a ...
... tether pre - tension is reduced , the wave- induced time - varying axial force becomes important in its dynamics and causes the tether to undergo parametric oscillations described by the Mathieu equation . Fortunately , in the case of a ...
Page 508
... tether tension reductions . Brekke and Gardner [ 1 ] analysed the tether bending stress , platform motion and tether re- tensioning by a numerical simulation when tethers experience brief tension loss . They concluded that a brief ...
... tether tension reductions . Brekke and Gardner [ 1 ] analysed the tether bending stress , platform motion and tether re- tensioning by a numerical simulation when tethers experience brief tension loss . They concluded that a brief ...
Page 511
... tether is in a slack condition , all the response amplitudes in the stable regions of the Mathieu chart become zero . Therefore , in terms of parametric oscillation , slack tethers can be undoubtedly adopted in stable regions . However ...
... tether is in a slack condition , all the response amplitudes in the stable regions of the Mathieu chart become zero . Therefore , in terms of parametric oscillation , slack tethers can be undoubtedly adopted in stable regions . However ...
Contents
CASE HISTORIES OFFSHORE STRUCTURES | 331 |
OFFSHORE TECHNOLOGY PART | 337 |
OFFSHORE STRUCTURE CONCEPTS | 361 |
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acceleration accelerometers added mass amplitude axial beam behaviour bending stiffness cable calculated Campos Basin catenary coefficient compliant tower components curvature curves cylinder damping ratio deck deformation developed diameter displacement drag drag coefficient dynamic analysis dynamic response effect Ekofisk elastic Engineering equation finite element finite element method flexible pipe fluid force free-fall lifeboat frequency domain hydrodynamic hydrodynamic damping impact in-span installation jack jacket joint launch length lift force linear load Mathieu Mathieu equation measured Mechanics meters method mode mode shape motion natural frequency nodal nodes nonlinear obtained Offshore Structures OMAE operation oscillation parameters phase pile platform pressure rotation seabed semi-rigid shear shown in Figure skin friction soil solution SPUS static analysis stiffness matrix submarine subsea support point tension tether torque transverse values vector velocity vertical vessel vibration Volume I-B water depth