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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
      <url>https://trid.trb.org/Images/PageHeader-wTitle.jpg</url>
      <link>https://trid.trb.org/</link>
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    <item>
      <title>PROPAGATION OF NUMERICAL ERRORS IN HYDRODYNAMIC COEFFICIENTS TO THE RESPONSE OF FLOATING STRUCTURES</title>
      <link>https://trid.trb.org/View/480285</link>
      <description><![CDATA[Error propagation from hydrodynamic coefficients to the response of floating structures is discussed.  Error propagation functions for one and two degrees of linear oscillation systems are proposed.  The influences of the errors in dimensionless parameters of the hydrodynamic coefficients are discussed by studying the properties of the error propagation functions.  The influence of asymmetry of the coefficient matrices is also investigated.  High rate of error propagation is seen at around natural frequencies of motions.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/480285</guid>
    </item>
    <item>
      <title>A STUDY ON THE EFFECT OF MEASUREMENT POINTS UPON REDUCED ADDED MASS MATRIX</title>
      <link>https://trid.trb.org/View/480534</link>
      <description><![CDATA[A new method of combination analysis using experimental modal analysis and BEM was developed by the authors.  To use this new method, the effect of arrangement of the measurement points upon the solution of the modal-BEM combinational analysis must be explained.  In this paper, the effect is explained by some concrete parametric calculations on an ellipsoid of revolution.  As the result of analysis on the calculations, 21 points distribution at regular intervals is enough for the number of the observation points to apply the method to the vertical bending vibration mode even below 4 node. Then the effect of rotation vector is analyzed, it is explained that the accuracy of the solution without considering the rotation vector cannot be better than on higher vibration mode, if many observation points are set.  This is verified by comparison with experiments in deep water and shallow water.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/480534</guid>
    </item>
    <item>
      <title>HYDRODYNAMICS OF A BODY MOVING OVER A MUD LAYER - PART II: ADDED-MASS AND DAMPING COEFFICIENTS</title>
      <link>https://trid.trb.org/View/467534</link>
      <description><![CDATA[A ship cross section undergoes periodic oscillations in a finite water layer, overlaying a mud layer.  The upper fluid is considered to be inviscid, and the mud is modelled as a Newtonian liquid.  The section contour is replaced by a distribution of wave sources with unknown strength, satisfying a corresponding boundary integral equation.  Its kernel is expressed through a newly derived Green function.  The numerical solution of the integral equation allows evaluation of the added-mass and damping coefficients.  Specific computations pertaining to Lewis forms show a drastic dependence of the added-mass and damping coefficients on the mud thickness and density.]]></description>
      <pubDate>Mon, 04 Nov 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/467534</guid>
    </item>
    <item>
      <title>THE CONCEPTS OF ADDED MASS AND INERTIA FORCES AND THEIR USE IN STRUCTURAL DYNAMICS</title>
      <link>https://trid.trb.org/View/455162</link>
      <description><![CDATA[A discussion on the concepts of added mass and inertia forces is provided combined with illustrative examples. The paper relates to submerged circular cylinders - single or in groups - only, and from an assessment of measured forces and analytical developments it is advocated that the added mass values determined from potential flow theory are adequate also for real flows. A procedure for determining the added mass coefficients for single cylinders and groups of cylinders has been developed and results are given for 4 different configurations.]]></description>
      <pubDate>Wed, 28 Feb 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/455162</guid>
    </item>
    <item>
      <title>ESTIMATION OF ADDED-MASS AND DAMPING COEFFICIENTS OF A TETHERED SPHERICAL FLOAT USING POTENTIAL FLOW THEORY</title>
      <link>https://trid.trb.org/View/455209</link>
      <description><![CDATA[Added-mass (alpha) and damping coefficients (beta) of a tethered spherical float, undergoing oscillatory motion in sinusoidal waves, have been derived from the motion generated velocity potential for one degree-of-freedom (surge) using potential flow theory.  Variations of added-mass and damping coefficients with respect to water depth, wave period and float size have been obtained.  Variations of added-mass and damping coefficients with wave period show that these hydrodynamic coefficients are frequency dependent, and this is because motion generated velocity potential is associated with the generation of surface gravity waves by the oscillating float.  The added-mass and damping coefficients are unaffected by water depth, but increase with size of the float.  Natural and resonant frequencies of the tethered float are computed for a wide range of wave periods using alpha and beta values.  Theoretical values of natural period of oscillation of the float agree closely with the experimental values.]]></description>
      <pubDate>Wed, 28 Feb 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/455209</guid>
    </item>
    <item>
      <title>COUPLING VIBRATION OF SHIP HULL AND SUPERSTRUCTURE FOR COMPOSITE MODEL OF MEMBRANE ELEMENT AND BEAM ELEMENT</title>
      <link>https://trid.trb.org/View/430993</link>
      <description><![CDATA[This paper presents a composite mechanical model of membrane element and beam element for a ship's hull and superstructure. Water added mass and model synthesis for the substructure are included in the method, which provides a suitable technique for detail-design in shipyards.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/430993</guid>
    </item>
    <item>
      <title>ON THE EFFECT OF FACET DISCRETISATION ON THE CALCULATED HEAVE ADDED MASSES FOR A SUBMERGED PONTOON</title>
      <link>https://trid.trb.org/View/431521</link>
      <description><![CDATA[The effects of facet discretisation on the calculated heave added masses for a submerged pontoon are investigated by using the three-dimensional and two-dimensional calculation methods. The results show that: when the number of facets approximating the model shape is small, a 10% difference in the calculated added masses may arise when compared with the results obtained by using a large number of facets.  The approximation at the corner part of the pontoon is particularly effective.  When estimating the heave added masses of a semisubmersible offshore structure by the singularity distribution method, the number of facets for the lower hull part should be carefully chosen.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/431521</guid>
    </item>
    <item>
      <title>A SIMPLE SCHEME FOR CALCULATING THE ADDED MASS OF HYDRAULIC GATES</title>
      <link>https://trid.trb.org/View/432241</link>
      <description><![CDATA[In gate research and design, added mass calculations serve to establish resonance frequencies, vibration modes and the magnitude of flow-induced self-excitation and damping.  The fluid boundary geometries vary strongly with gate position and water level variation.  A relatively simple and versatile computation scheme is presented which is based on 2-D potential flow without wave radiation.  Only small amplitude vibrations are considered. A square mesh grid is used, and the potential flow problem is solved by use of finite differences and the classical pointwise Gauss-Seidel iteration (relaxation) method.  When the spread-sheet type calculation is used, boundary conditions and boundary locations can easily be varied; this makes it suitable for demonstration purposes.  Presented are the boundary conditions, and how they are introduced in the computation scheme.  The accuracy of the results is discussed for some cases for which analytical solutions exist: the vibrating strip and the vibrating wall.  The number of relaxations needed, the use of over-relaxation and the introduction of an automatic stop of the calculation are outlined.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/432241</guid>
    </item>
    <item>
      <title>AN EFFICIENT SURFACE PANEL METHOD FOR THE CALCULATION OF ADDED MASS MATRICES FOR DISCRETISED STRUCTURES</title>
      <link>https://trid.trb.org/View/434242</link>
      <description><![CDATA[The prediction of the dynamic structural response of submerged marine structures necessarily includes the effect of the fluid on the structure. In the general case, the fluid/structure interaction leads to a complex coupled boundary value problem which is often of infinite extent. If our interest is confined to the low frequency elastic response of the structure, the interaction can often be reduces to frequency independent added mass and damping terms in the structural dynamic equilibrium equations.  This paper discusses an efficient surface panel method for the calculation of the fluid mass matrices using only the fluid/structure interface geometry. In conjunction with a general purpose finite element analysis system, the method has proven very effective for the prediction of dynamic structural response.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/434242</guid>
    </item>
    <item>
      <title>ON THE SIGNIFICANCE OF NEGATIVE ADDED MASS</title>
      <link>https://trid.trb.org/View/434674</link>
      <description><![CDATA[The occurrence of negative added mass is discussed and is shown to be coupled to the occurrence of a strongly peaked damping curve and appears when the  structure excites local hydrodynamic resonance in its vicinity. In the paper the added mass and damping curves are shown to correspond to the equivalent curves for a two degrees of freedom harmonic oscillator, which helps explaining the mechanism behind this peculiar behaviour. The case when there is more than one mode of motion involved is briefly discussed in connection with a TLP in transit condition before deck mating.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/434674</guid>
    </item>
    <item>
      <title>HYDRODYNAMIC FORCES AND RESULTING MOTION OF SUBSEA MODULES DURING LIFTING IN THE SPLASH ZONE</title>
      <link>https://trid.trb.org/View/434680</link>
      <description><![CDATA[The lifting of a subsea module through the splash zone is often a crucial phase during a marine crane operation. In the paper an approximate calculation model for the forces and motion of the module is presented. This is a fairly simple method based on the use of hydrodynamic coefficients.However, to account for the non-linearities, position dependent coefficients are used.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/434680</guid>
    </item>
    <item>
      <title>WAVE RADIATION BY TRUNCATED ELLIPTICAL CYLINDER</title>
      <link>https://trid.trb.org/View/435244</link>
      <description><![CDATA[The radiation of small-amplitude water waves by an oscillating submerged elliptical cylinder is investigated analytically. The cylinder may either be totally submerged and resting on the seabed (case I) or partially immersed in the free surface (case II). The structure and an exterior region extending to infinity in the horizontal plane. Expressing the boundary-value problem in elliptical coordinates, analytical expressions for the velocity potentials satisfying the governing equation and boundary conditions in each region may be written in terms of infinite series involving Mathieu and modified Mathieu functions. The unknown coefficients in these series are determined by imposing continuity of mass and momentum fluxes at the fluid interface between the two regions. Utilising this solution, numerical results are presented that illustrate the variation of the added mass and radiation damping coefficients with oscillation frequency for several example structures.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/435244</guid>
    </item>
    <item>
      <title>ADDED MASS INCREASE DUE TO WAVES FOR SLOW DRIFT OSCILLATION OF A MOORED SEMI-SUBMERSIBLE</title>
      <link>https://trid.trb.org/View/437230</link>
      <description><![CDATA[An added mass increase due to waves for a slow drift oscillation of a moored semisubmersible was determined by slow motion forced oscillation tests in waves. Its effects on both free oscillation in waves and slow drift oscillation in irregular waves are discussed. Little attention has been given to this. The added mass increase is significant for a semisubmersible, but less so for a barge or a tanker.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/437230</guid>
    </item>
    <item>
      <title>WATER EXIT OF SLENDER AND NON-SLENDER BODIES</title>
      <link>https://trid.trb.org/View/437435</link>
      <description><![CDATA[No abstract provided.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/437435</guid>
    </item>
    <item>
      <title>DRAG AND ADDED MASS STUDY ON ARBITRARY OSCILLATING MARINE BODIES</title>
      <link>https://trid.trb.org/View/437830</link>
      <description><![CDATA[An original applied study has been developed, concerning the analysis and the prediction of the hydrodynamic forces which act upon arbitrarily oscillating bodies in the sea. The Morison formulations have been applied also for the case of constant drag and mass coefficients, when the wake velocities which are produced by the body motions in all the past histories are corrected. Wake velocities have also been computed on the basis of the unsteady turbulence theory, which is available from the existing literature. The predicted results have been compared with experimental ones from many laboratory pendulum tests. The said tests have been performed both on single and coupled cylinders, with particular care for the overall configuration cases and possibilities. Starting from the 1st case of square cylinders, the study has been generalised to the case of circular cylinders.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/437830</guid>
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