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Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-068
...- ants. The case of constant temperature is considered in this paper so the temperature dependences are not analysed. Under constant stresses, thed-,a, t£ parameters are also cons- tant so the equation (6) is integrated and resulted in the fo~ h'i = a. (i /( (- ilh (7) According to (6) and (7), the t=tf...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-016
... probability distribution with thick tails (high kurtosis) If the equations of motion were quasi-static, the high kurtosis of the exciting force would pass unabated into the response. When the dynamics is taken into account, it is found that the motion becomes more Gaussian. This is beneficial in terms...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-060
... formulation of the problem is justi- fied. Let us suppose that the wavelength of ice cover flexure is much greater than the thickness of ice. In this case the change of strain energy of ice in process of crack growth, e.g. the energy needed for fracture, may be calculated by means of flexure equation...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-006
... bi-frequency domain sum frequency frequency monochromatic wave mooring system equation upstream oil & gas surge response experiment dual wave subsea system coefficient drift force drift motion wave drift amplitude surge drift motion prediction excitation slow drift motion...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-051
... system upstream oil & gas equation conductor system overpressure PllILeedll1gs Ihe FII ,I (1990) ElIIopean Off,hOle MeLhann, SymposIUm TlOndhelm, NO! way, 20-22 Augu'l 1990 CopYlIghl © 1990 hy The InteinallOnal Souely aJOjj\hO/e and Palm Engll1eel' ISBN 0-9626104-4-5 BUCKLING CALCULATION...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-047
... is to introduce a consistent procedure for the introduction of both elastic and plastic multi-axial stress-strain effects into the design process. allowable hoop stress plasticity axial stress calculation equation equivalent strain upheaval hoop stress submarine pipeline specification thickness...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-032
...) In order to reduce the amount of computational effort involved in computing the kinematics at the displaced position of the platform at each instant of time, the direct FFT of 71(0, t) is performed only once and the summations in equations (12) to (16) are done directly at each time step. The equations...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-059
... the amount of the reduction of the dynamic tension amplification obtained can then be incorporated within a consistent optimization procedure (Mavrakos et al, 1989c). triantafyuou numerical result papazoglou equation mavrako configuration elasticity buoy subsea system procedure similitude...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-054
... are free to slip, there will not be any interference between wire layers which could increase bending stiffness. PART II - DEGRADATION MODEL This part includes discussions of the equation for wire slip during pipe bending, the criteria for the onset of slip, and public-domain wear data that will be used...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-018
... is based on the Morison equation and/or two-dimensional potential flow theory, and global structural analysis IS executed by using spatial framework model, e.g., see [Akita et al , 1978). Recent remarkable progress of electronic computers, however, has enabled three-dimensional diffraction/radiation...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-063
.... variation interaction strength equation adhesion structure building intensity ice strength granulated ice strength variation spray cone method air temperature calculation foundation ice building ice structure cross-section experimental result show upstream oil & gas P, oceedmgs...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-008
... with constant panel methods and HOB EMs that are employed in conjunction with the hybrid boundary integral equation procedure, for a variety of structural configurations. It was concluded from the study that HOB EM has several important features: it uses many fewer boundary elements and much less computer time...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-019
... Theoretical Background The equilibrium equation is derived from the principle of virtual velocities: (1) where Eext is the rate of external work done on the shell and Emt is the rate of internal energy in the shell. 154 For s~ells crushed by a thin flat transverse punch load, as shown in Figure 1, the rate...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-004
... of solving for all the values of x which give a known set of y is not immediately n u possible. It can however be ach1eved by transforming the signals into the frequency domain such that the above equation becomes: Y(w) H(w)X(w) (2) The sequence xn can then be retrieved by inverse Fourier transformation. wN...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-005
... in linear springs, large discrepancies have been observed between model test results and numerical simulations. This paper presents a numerical model where the equations of motion are simulated in the time domain in 6 degrees of freedom. Wave excitation forces and moments are modeled to second order, while...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-015
... assumption denote noise approximation stochastic linearization mssl standard method stochastic linearization method extreme response response level artificial intelligence deviation measure prediction procedure accurate estimate offshore structure exceedance probability equation...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-055
... technique for simulating the dynamics of such a system, based on simplifications of the governing equations which retain the relevant motions and the accuracy of the solution. The ARGO/JASON system at the Woods Hole Oceanographic Institution is used as a case example, verification of some numerical...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-061
... an dy (A3) To satisfy moment equilibrium on the element, VTbdl+1f od-Y)dY] (A4) Substituting for an and 'tnt from equations (AI) and (A2) into equilibrium equations (A3) and (A4) and equating the two expressions gives a formula which upon back substitution into either equilibrium equation gives...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-065
... the structure. In the following analysis, we further simplify this scenario by assuming a uniaxial state of stress within ice. microcrack grain boundary material property continuum damage wave propagation ice force ice-structure interaction ice bar damage evolution equation characteristic...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-017
... Abstract This paper concerns an investigation of the effects of nonlinearity of drag loading on offshore structures excited by 2D wave fields, where the nonlinear term in the Morison equation is replaced by an equivalent cubic expansion. The equivalent cubic expansion coefficients...

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