The Sigma-8 Tension is a Drag
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Tension (geology)
Sigma
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Dynamic tensions of mooring lines may be ignored in the estimation of wave frequency motions of a floating structure, but for slow drift oscillations hydrodynamic forces acting on mooring lines are important, because drag forces acting on mooring lines act as the damping force and have a great effect on the slow drift oscillation.When dynamic tensions of mooring lines are calculated in full consideration of added mass forces and drag forces acting on mooring lines, a numerical calculation such as Lumped Mass Method is usually used. The numerical calculation needs prohibitively long computer time and it is not practical in the early stage of the design of a floating structure. The authors had developed an Approximate Method for calculating the dynamic tension taking the added mass force and drag force into consideration. A remarkable feature of this calculation method is its short computation time, and the accuracy of the approximate method has been confirmed by comparing calculated results with experiments. The original form of the Approximate Method was applicable to the only frequency domain problem and therefore it was impossible to apply the calculation method to the problem in irregular waves.In this paper a Modified Approximate Method extended to the time domain problem is presented. The calculated results of the slow drift oscillation of a floating structure and dynamic tensions of mooring lines obtained by using the extended approximate method are compared with the experimental ones. The calculated results are in good agreements with experimental ones.
Mooring
Oscillation (cell signaling)
Added mass
Tension (geology)
Line (geometry)
Morison equation
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Tension (geology)
Sigma
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Mooring
Oscillation (cell signaling)
Tension (geology)
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For predicting the motion and structural responses of tension leg platforms(TLPs) in regular waves, a numerical scheme is introduced. The numerical approach in this paper is based on a combination of the three dimensional source distribution method and the finite element method. The hydrodynamic interactions among TLP members, such as columns and pontoons, are included in the motion and structural response analysis. The drag forces on the submerged slender members, which are proportional to the square of relative velocity, are newly included in order to estimate the responses of members with better accuracy. Comparisons with other's results verifies the works in this paper.
Tension (geology)
Square (algebra)
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Tension (geology)
Sigma
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Herein, a theoretical method based on the catenary model Is applied to obtain the tension and drag forces acting on the trash curtain which is deployed at river for the prevention of floating debris inflow into the ocean. Under the assumption that fluid drag is perpendicular to the trash curtain, the tension and drag forces are uniform along the trash curtain. As a numerical model, the trash curtain is moored both symmetrically and asymmetrically with respect to the flow. The tension and drag forces on the trash curtain are investigated according to the change of Bap ratio and inclined angle of the trash curtain. Numerical results show that tension parameter is increased as the gap ratio is increased. It is found that tension parameter is reduced as the inclined angle is increased in the case of asymmetric deployment. The numerical model is applied to the specific problem for the trash curtain (200m) deployed at the Tancheon on the Han river. The maximum inflow velocity that anchor system can endure is 2m/sec.
Tension (geology)
Inflow
Catenary
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The yarn breakage in ring spinning depends mainly on the balancing relationship between the yarn tension and the yarn strength. The spinning tension is determined by the dynamic equilibrium of ring-traveller and of yarn balloon. Researchers studied the balloon tension without considering the air-drag and!Coriolis force. The effects of air-drag and Coriolis force on the balloon tension are discussed. Results show that the air-drag and Coriolis force should not be neglected with the increase of spinning speed and the higher requirements on yarn quality.
Tension (geology)
Breakage
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