... of such systems. wave drift wave period coefficient oscillation otc 6138 amplitude upstream oil & gas subsea system wave height wave amplitude surge wave frequency mass coefficient tanker frequency moored tanker offshore technology conference dampi ng spring constant test run OTC...

... significant wave height natural frequency interaction mechanism spring constant stiffness storm OTe 5222 Measured Soil-Structure Interaction Properties of a Gravity Platform by N. Spidsoe and O. Skj~stad, SINTEF Copyright 1986 Offshore Technology Conference This paper was presented at tfle-18Th Annual...

... of the tensioning system (ZH =0) and the mean fleet angle (90 j. The linearized equations, A.3 and A.4, give stiffness terms (spring constants) which relate the lateral force to the relative angle between vessel and riser. The overall stiffness of the tensioning system is the sum of the contributions of each...

... top tension dynamic top tension bulk modulus riser specvib frequencydomain configuration drilling riser foot riser deepwater drilling riser upstream oil & gas riser length computer program prediction mud column time domain model mud column dynamic spring constant mud mass...

... result peak frequency subsea system displacement pile offshore platform earthquake record spring constant pipeline platform multi degree proc transfer function characteristic frequency earthquake response analysis natural period freedom model OTC 4208 Observation and Analysis...

... records include frequency components up to about 25 Hz. Pile-Head Spring Constants and Damping Coefficients Pile-head spring constants and damping coeffi- cients are important to the characterization of the SPS response as they control the responses of the pile due to pile-head loads. Under the steady...

.... This paper discusses in detail an important concept with regard to dynamic applications of synthetic lines and explains its significance to the designer: the dynamic stiffness, or apparent spring constant, is 3-4 times greater than the quasi-static spring constant which is often misapplied to dynamic...

...-frequency longitudinal surge phenomena in still water and in head waves of a VLCC and a LNG carrier moored in relatively deep water. extinction test regular wave natural frequency surge motion upstream oil & gas rad moored vessel wave drift force spring constant equation hydrodynamic...

... with an equivalent spring constant in its range of application. The nonlinear drag term is also linearized. Under these assumptions, the equations of motion can be solved in a semi-closed form solution. To verify the validity of the assumptions made, a series of wave tank tests were performed with a tower-tank...

... relationship: l~~n = 21T '" M , where K is the stiffness or the spring constant, and Mis the effective mass. __ The probe is, in effect, a cantilever and, therefore, the stiffness is given by the following relationship. K = 3EI 13 where E is the modulus of elasticity, I is the moment of inertia, and 1...

... and the motions of the moored ship below certain acceptable values? captive vessel engineer mdwt tanker moored ship lateral motion coefficient impulse-response function calculation mowt tanker moored vessel nference paper 6200 mooring system water depth spring constant ship equation...

.... SARGENT M. J. MORGAN 321 case the assumptions are made that the mooring line weight per unit length is constant and the lines do not break nor the anchors lift off or drag. * The slope of the restoring force versus displace- ment curves shown in Figure 1 -is the effective spring constant of the mooring...

... cable system equation spring constant static spring constant upstream oil & gas luency engineer coefficient cable slack oscillationtest OFFSHORE TECHNOLOGY CONFERENCE 6200 North Central Expresswgy Dallas; Texas 75206 .. THIS IS A PREPRINT SUBJECT TO CORRECTION =~ OTC 1156 Analytical...

... variation platform vector drag coefficient coefficient displacement tension leg stable platform upstream oil & gas random wave evaluation matrix spring constant equation prediction amplitude model 1 OFFSHORE TECHNOLOGY CONFERENCE 6200_North Central Expressway Dallas, Texas 75206...