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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>
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      <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>SEA-LINE LAYING IN DEEP WATERS</title>
      <link>https://trid.trb.org/View/66738</link>
      <description><![CDATA[In the mathematical model of the laying in deep waters neither the large deformations nor the large displacements can be neglected.  Therefore, the equilibrium configuration is the solution of a nonlinear integrodifferential equation with idoneous boundary conditions.  The resolutive technique of this equation has involved a reformulation of the problem, namely finally the solution of a nonlinear integral equations system.  The presence of currents involves a deflection of the elastic line from the laying vertical plane and then the calculation of its tridimensional equilibrium configuration.  In practical cases, the traction applied by tensioner contains the deflection between small values with respect to the launching span length. Therefore, it has been obvious to construct the tridimensional mathematical model by properly combining the previous model in large deformations for vertical projection with a small deformations model for the horizontal projection of the elastic line.  Meteorological and environmental conditions can require the carrying cut of abandonment operations (and subsequent recovery) of the sea line.]]></description>
      <pubDate>Wed, 23 Feb 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66738</guid>
    </item>
    <item>
      <title>DESIGN CONSIDERATIONS FOR DYNAMICALLY POSITIONED UTILITY VESSELS</title>
      <link>https://trid.trb.org/View/66744</link>
      <description><![CDATA[Automatic stationkeeping alongside an offshore stucture represents a particularly demanding requirement for a dynamically positioned utility vessel.  The adequacy of existing conventional position determination methods is reviewed and the potential of new, but unproven, radar-ranging techniques is discussed.  The effects of utility vessel drag, mass, and propulsion characteristics on stationkeeping performance are described and compared to "ballpark" requirements anticipated for positioning alongside both stationary and floating platforms.]]></description>
      <pubDate>Wed, 23 Feb 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66744</guid>
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    <item>
      <title>JETFOIL--A POTENTIAL HIGH SPEED MARINE OFFSHORE SUPPORT VEHICLE</title>
      <link>https://trid.trb.org/View/66759</link>
      <description><![CDATA[In 1975 the Jetfoil was introduced into scheduled passenger service in Hawaii and Hong Kong.  It is a fully submerged foil hydrofoil that employs turbine powered waterjet propulsion and automatic stabilization and control to enable high speed operations in rough seas.  Configuration, performance and economic information are presented.  Key technical features, results of tests and presented operations are discussed.]]></description>
      <pubDate>Wed, 23 Feb 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66759</guid>
    </item>
    <item>
      <title>COMPUTATION OF RELATIVE MOTION EFFECTS IN OFFSHORE SUPPLY OPERATIONS</title>
      <link>https://trid.trb.org/View/66760</link>
      <description><![CDATA[Using currently available computer programs for computing the wave induced motion of ships and stable platforms it is now possible to make good predictions of vessel absolute and relative motion in both regular and random waves.  It remains only to combine these computations for typical supply boats and semi-submersibles to determine the relative vertical motion between say the platform crane boom and the after deck of the supply boat.  The computation then provides a good basis for answering several design and operational questions such as: Optimum size of supply vessel.  Limiting sea states.  Comparisons of conventional vs. semi-submersible supply vessels.  Some results are given of parametric studies of supply vessel size and proportions in various sea states.]]></description>
      <pubDate>Wed, 23 Feb 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66760</guid>
    </item>
    <item>
      <title>ANOMALIES IN THE RESPONSE OF SEMISUBMERSIBLES</title>
      <link>https://trid.trb.org/View/66067</link>
      <description><![CDATA[This paper describes how two model basins, testing the same semisubmersible design, produced different motion response results.  Subsequent testing revealed the phenomena that the heave response of the model is extremely sensitive to small changes in wave period.  Calculations show that over- simplification of the heave response can produce significant overestimates of actual heave values, and, hence an overestimate of weather downtime that a drilling vessel will experience.  It can be concluded that detailed model tests are very important for the accurate determination of vessel performance.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66067</guid>
    </item>
    <item>
      <title>CERTIFICATION OF CONCRETE GRAVITY PLATFORMS IN THE NORTH SEA</title>
      <link>https://trid.trb.org/View/66068</link>
      <description><![CDATA[The Certification of a concrete platform requires an independent examination of the design and construction of an offshore structure.  This paper confines itself to some aspects of the structural and foundation analysis of the Frigg CDPI platform carried out by Lloyd's Register of Shipping.  Originally the platform was designed to serve as a booster station on the Frigg to Peterhead pipeline. However, due to unforseen circumstances, it was decided to use the platform for drilling and production in the Frigg Field itself.  This anlaysis emphasizes foundation studies, including a detailed site investigation, laboratory testing of soil samples, finite element analysis and centrifugal model testing.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66068</guid>
    </item>
    <item>
      <title>CLOSED-FORM EXPRESSIONS FOR DETERMINING THE FATIGUE DAMAGE OF STRUCTURES DUE TO OCEAN WAVES</title>
      <link>https://trid.trb.org/View/66069</link>
      <description><![CDATA[Closed-form mathematical expressions are derived for the fatigue damage of structures due to ocean waves.  The expressions incorporate relationships between wave height and stress range, between stress range and number of cycles to failure (i.e. a fatigue curve), and the probability distribution for the occurrence of wave heights.  The expressions can be utilized to predict the fatigue damage resulting from a single sea state, from a storm, or during the service life of a structure.  In addition, the fatigue life of a structural element can be determined directly from the stress range resulting from the design wave, or conversely, an "allowable stress range" can be determined for the design wave which will insure a specified fatigue life.  Example applications are given for areas having wave climates similar to the North Sea and similar to the Gulf of Mexico.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66069</guid>
    </item>
    <item>
      <title>COMPARISON OF FULL-SCALE PERFORMANCE MEASUREMENTS OF AKER H-3 WITH THEORETICAL PREDICTIONS</title>
      <link>https://trid.trb.org/View/66070</link>
      <description><![CDATA[This paper reviews measurements of wave induced motions and stress carried out on "Deep Sea Driller", the first Aker H-3 semisubmersible drilling rig operating in the North Sea.  The measurements were performed regularly from February 1974 until January 1975 with the exception of the summer period June-September.  All recorded data were analysed employing standard statistical methods. Comparisons with experimental data derived from model tests and theoretical computations using advanced computer programs, were carried out for a wide range of wave conditions.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66070</guid>
    </item>
    <item>
      <title>DEEP WATER MAT-SUPPORTED JACK-UP DRILLING UNIT WITH TUBULAR TELESCOPING COLUMNS AND INTERMEDIATE COLUMN FRAME</title>
      <link>https://trid.trb.org/View/66071</link>
      <description><![CDATA[Basic features of a mat-supported jack-up mobile drilling unit are described in this paper.  Important new components are the telescoping columns, a column frame attached to the lower end of the upper columns, and a jacking system wholly contained in the upper platform which actuates both the lower (inner) and upper (outer) columns.  The telescoping columns and an intermediate column frame are not new concepts in themselves.  However, the way in which these features are integrated into the overall design is unique and allowed the development of a single jacking system to perform all jacking functions.  Drawings and tabulated information show the general arrangement, size, capacities, and particular capabilities of the first rig designed utilizing this configuration and concept.  Arrangement of the jacking system is shown and operation of the jacks described.  Floating stability and column stress due to dynamic motion is discussed.  Wave forces and moments are compared with other column configurations.  Weight of the rig is also compared with other mat jack-up rigs.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66071</guid>
    </item>
    <item>
      <title>EFFECTS OF CURRENT ON DYNAMIC RESPONSE OF OFFSHORE PLATFORMS</title>
      <link>https://trid.trb.org/View/66072</link>
      <description><![CDATA[The stochastic dynamic responses of offshore platforms, with and without the presence of current, are studied and discussed.  The formulation derived in the paper can be used to determine the statistics of platform response with proper consideration of the nonlinear effect caused by current.  The phenomenon of wave-current interactions is known to change wave characteristics; its effect on structural responses is also examined.  Five deepwater platforms are analyzed under different wind wave and current loading conditions.  Numerical results showing the effect of current, the contribution of current when the wind waves become stronger, and the effect of wave-current interactions on the dynamic response are presented.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66072</guid>
    </item>
    <item>
      <title>IN-LINE AND TRANVERSE FORCES ON CYLINDERS IN OSCILLATORY FLOW AT HIGH REYNOLDS NUMBERS</title>
      <link>https://trid.trb.org/View/66076</link>
      <description><![CDATA[The design of structures for the marine environment requires the prediction of the forces generated by waves and currents.  This paper presents the results of an extensive experimental investigation of the in-line and transverse forces acting on smooth and rough circular cylinders placed in oscillatory flow at Reynolds numbers up to 700,000, Keulegan-Carpenter numbers up to 150, and relative roughness from 0.002 to 0.02.  The drag and inertia coefficients have been determined through the use of the Fourier analysis and the least squares method.  The transverse force (lift) has been analyzed in terms of its maximum, semi peak-to-pe and root-mean-square values.  In addition, the frequency of vortex shedding and the Strouhal number have been determined.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66076</guid>
    </item>
    <item>
      <title>MULTI-STAGE DECISION APPROACH TO PRIORITIZED AUTOMATIC ACQUISITION</title>
      <link>https://trid.trb.org/View/66078</link>
      <description><![CDATA[The automatic acquisition of radar targets is the major aspect of the IBM Maritime Applications/Bridge System discussed in this paper.  The Collision Assessment module searches an operator specified portion of the radar field. Targets of interest are acquired and placed in a priority tracking structure according to the degree of threat they pose.  The Collision Assessment module solves the problem of false targets arising from sea clutter and surrounding land masses by screening out false targets in a unique fashion involving a high degree of software control. Results drawn from experience with an automatic acquisition installation on an English Channel ferry are discussed.  A logical extension is to offshore platforms, particularly those located adjacent to principal access routes to ports.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66078</guid>
    </item>
    <item>
      <title>OFFSHORE PLATFORM DISPLACEMENT WITH AN INERTIAL REFERENCE SYSTEM</title>
      <link>https://trid.trb.org/View/66079</link>
      <description><![CDATA[Platform displacement measurements are useful in evaluating analytical techniques, basic assumptions, and conditions related to platform dynamics.  Light portable equipment using an inertial reference to measure platform motion is described.  Amplitudes in the range of a few thousandths of an inch to a foot or more over a frequency band of one twentieth of a Hertz to several Hertz can be measured. Examples of calibration runs and actual platform tests are given.  Methods of presenting data are illustrated including strip chart recording, horizontal plane platform motion plots, displacement spectrum plots and extended time multiple spectra plots.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66079</guid>
    </item>
    <item>
      <title>PIPELAY/DERRICK BARGE DESIGNED FOR ROUGH SEAS</title>
      <link>https://trid.trb.org/View/66080</link>
      <description><![CDATA[SEMAC I, a large semisubmersible pipelay/derrick barge designed specifically for use in rough-sea areas, is now under construction and scheduled for completion in 1976. The barge will be capable of installing large diameter pipelines in water depths exceeding 1200 ft.  Modifications can be made to the barge for installing pipelines in even greater water depths when the need arises.  This paper describes the barge and discusses reasoning behind selection of the hull and equipment on it.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66080</guid>
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