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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>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>Comparing results of a power prediction tool with measured data from a series of 35 boats</title>
      <link>https://trid.trb.org/View/1595386</link>
      <description><![CDATA[Power prediction is one of the major steps when it comes to design a military boat. Having a fast running and reliable tool to select the appropriate couple engine/propulsion permits to explore more hull's possibilities.This study is built on a comparison made between a predictive tool and a series of 35 hard chine planing boats, constructed to be identical. The different theories used to program the Power Prediction Tool (PPT) will be cited as reference but will not be developed.In this article, the authors present the influence of the different parameters and the validity of their tool.]]></description>
      <pubDate>Thu, 28 Mar 2019 13:23:57 GMT</pubDate>
      <guid>https://trid.trb.org/View/1595386</guid>
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      <title>PREDICTION OF PROPULSIVE POWER FOR SHIPS WITH HOMOGENEOUS HULL AND HIGH SPEED</title>
      <link>https://trid.trb.org/View/479812</link>
      <description><![CDATA[The paper describes a method for the prediction of the propulsive power of high speed ships with homogeneous hulls.  A validated computation for a comparison of the estimation with the measurement of propulsive power for a series of ship models showed that the prediction method is satisfactory and can be applied for the optimization of ship hull lines.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/479812</guid>
    </item>
    <item>
      <title>REVISED SPEED-DEPENDENT POWERING PREDICTIONS FOR HIGH-SPEED TRANSOM STERN HULL FORMS</title>
      <link>https://trid.trb.org/View/479791</link>
      <description><![CDATA[Despite significant efforts during the past three decades devoted to the development of powering prediction tools for semi-planing hulls, limitations inherent in these tools have restricted their applicability to ships similar in size to patrol boats.  This study represents an attempt to overcome some of these limitations.  It is an extension of the authors' earlier work on speed/power predictions for transom-stern ships using regression analysis.  The earlier work used speed-independent statistical models to compute residuary resistance, and satisfactory results were achieved.  However, due to the statistical distribution of the resistance database and the nature of speed-independent regression models, the predicted speed/power curves exhibited discontinuities in certain cases.  Therefore, the current study employs a speed-dependent regression model for which in-depth analyses have been performed.  The findings from this study are promising and should provide naval architects with a useful powering prediction tool for ship types ranging from high- speed, round-bilge patrol boats to large, transom-stern displacement hull forms.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/479791</guid>
    </item>
    <item>
      <title>ALTERNATIVE PROPELLER CONCEPTS FOR HIGH SPEED PLANING HULL CATAMARANS</title>
      <link>https://trid.trb.org/View/480018</link>
      <description><![CDATA[This paper examines the first part of the propulsion investigations performed for a hard chine catamaran hull Series '89. The propulsive power was determined with subcavitating propellers behind a deadwood, on oblique shafts or in tunnels of two different heights.  The effects of the form parameters and different propeller concepts on the powering performance and the hull-propeller interaction factors are discussed.  The power requirements of three different propeller arrangements are compared with each other and they are also compared with those of waterjets tested at two hull variants of the Series '89.  A simple and reliable power prediction method which is based on the specific power is described.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/480018</guid>
    </item>
    <item>
      <title>PROPULSION, AN IMPORTANT PART OF VESSEL DESIGN?</title>
      <link>https://trid.trb.org/View/480934</link>
      <description><![CDATA[It is evident that not all the passenger ships and ferries are being built in accordance with the best experience and knowledge. Surprisingly large differences can be found in performance capabilities between similar newbuildings.  A difference of 15% in the required power for the same speed is very common, the biggest difference met up till now being 30%.  It can be concluded that most ro-pax, ferry and passengers vessels are being built with excessive engine power, requiring higher investment and running costs than necessary, with corresponding negative environmental effects.  The article gives an example of speed-power predictions by different model basins and yards for the same projects.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/480934</guid>
    </item>
    <item>
      <title>LARGE SES CALM WATER AND HEAD SEA PERFORMANCE - A COMPARISON BETWEEN MODEL BASIN TEST RESULTS AND ESTIMATES USING PERF SOFTWARE</title>
      <link>https://trid.trb.org/View/480022</link>
      <description><![CDATA[Extensive resistance and waterjet self propulsion tests have been carried out with a model of a large Surface Effect Ship (SES). The towing force and dynamic trim and sinkage of the model as well as pressures and flow rates in the air supply system and the plenum were measured.  Various pressures were monitored in the waterjet systems during the propulsion tests in order to derive the thrust.  The test conditions included the variation of lift/weight ratio, LCG position, waterjet pump speed and ship speed.  The results of these tests are compared with theoretical calculations performed with the power prediction software PERF.  The PERF mathematical model has been extended in order to account for a two fan air supply system. Validation of PERF using a larger scale SES model shows that PERF is a useful tool for the design and detailed performance prediction of SES.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/480022</guid>
    </item>
    <item>
      <title>ESTIMATE OF MAIN ENGINE POWER FOR PANAMA SHIPS</title>
      <link>https://trid.trb.org/View/480390</link>
      <description><![CDATA[The feasibility and the accuracy of the traditional Holtrop's method and the newly published Titov's method are discussed for calculating the main engine power of Panama ships.  An approximate estimate of the main engine power is given for a bulk carrier and a container ship at the preliminary design stage.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/480390</guid>
    </item>
    <item>
      <title>NEW GENERATION OF 135,000 M3 LNG-CARRIERS: DETAILS OF A HYDRODYNAMICAL OPTIMISATION PROCESS</title>
      <link>https://trid.trb.org/View/467170</link>
      <description><![CDATA[This paper describes a wide-range R&D project for the development of a 135000 m3 LNG carrier.  The project encompassed a first phase to fix the concept and the main dimensions, a second phase involving wave making calculations and still-water model tests, and a final phase consisting of extensive model tests to study afterbody alternatives, to test energy saving devices and to assess the seakeeping performance which cannot be further improved by energy saving devices, and good seakeeping and manoeuvring properties.  The project demonstrates the modern practice of an integrated use of calculations and model tests to find design directions and to establish the actual performance.]]></description>
      <pubDate>Mon, 04 Nov 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/467170</guid>
    </item>
    <item>
      <title>EFFECT OF SPACING AND FORM OF SKEG ON THE POWERING PERFORMANCE OF TWIN-SKEG SHIPS</title>
      <link>https://trid.trb.org/View/433850</link>
      <description><![CDATA[This paper deals with the resistance and self-propulsion tests on four models of a twin-skeg passenger ship. The effects of skeg spacing, skeg inclination and hull form are investigated. According to the authors, the model tests demonstrate the superiority of inward-turning propellers in powering performance. An induced pre-swirl to the propeller was confirmed by wake survey. The influence of hull form is small when the skeg spacing is equal to half the breadth of the ship and the skeg inclination is zero.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/433850</guid>
    </item>
    <item>
      <title>RESISTANCE AND POWERING PREDICTION FOR TRANSOM STERN HULL FORMS DURING EARLY STAGE SHIP DESIGN</title>
      <link>https://trid.trb.org/View/441829</link>
      <description><![CDATA[Regression analysis has been successfully used to analyse resistance data for both random hull forms and methodical series. The success of statistically based resistance prediction programs quite often relies on the homogeneity of the database.  The applicability of such programs, therefore, is usually limited to certain types of hull forms.  However, naval architects have always experienced the situation where the hull form parameters of their designs lay outside the data range of the available resistance prediction programs.  This paper attempts to address this problem by performing regression analyses based on large databases which are comprised of numerous ship types.  Three large groups of data ranging in size from 426 to 763 test conditions per groups, have been examined to expand the range of applicability.  The findings from this study are quite promising. The resistance and powering prediction program in this paper provides readers with a broad range of coverage on speeds and hull form parameters during the early stages of ship design.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/441829</guid>
    </item>
    <item>
      <title>ON POWER PREDICTION AND MODEL TESTING METHODS</title>
      <link>https://trid.trb.org/View/443887</link>
      <description><![CDATA[In 1978, the International Towing Tank Conference (ITTC) power prediction method was adopted as a standard method at the 15th ITTC.  It needs three kinds of model tests, i.e. the hull resistance test, the propeller open-water test and the self-propulsion test.  Recently, several researchers presented new methods which do not always require these three tests.  The paper briefly outlines these methods including the ITTC 1978 method and shows comparisons of delivered horse power and rate of revolutions predicted by the methods applied to the two small (Lpp=2.50m) Series -60(Cb-0.60) and GBT-25 (Cb-0.834) models tested at Kyushu University.  Predicted results agree with each other within the range of empirical corrections.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/443887</guid>
    </item>
    <item>
      <title>SHIP POWER PROGNOSIS USING EXPERIMENTAL DATA BASE</title>
      <link>https://trid.trb.org/View/434097</link>
      <description><![CDATA[A new technique for propulsion power prognosis of ships is presented, based on using an experimental database. The kind of data to be stored in the database in order to fit the demands is discussed. The procedure of using these data is described, including necessary corrections. The paper is limited to model-scale data and does not deal with scale effects.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/434097</guid>
    </item>
    <item>
      <title>REGRESSION ANALYSIS APPLIED TO MODEL TESTING</title>
      <link>https://trid.trb.org/View/443681</link>
      <description><![CDATA[A new method of analysing model test data is proposed.  The method involves the use of a regression analysis to reduce the errors inherent in model testing, it is further suggested that this regression analysis should be performed on a crossplot of model resistance against model weight at constant speeds.  In this way it is possible to express the model resistance as a function of model weight and model speed.  With this information at hand the resistance and effective power for any ship side and displacement within the range of the model test may easily be found.  The theory is tested out on results from an actual model test.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/443681</guid>
    </item>
    <item>
      <title>STATEMENTS FOR THE ANALYSIS AND EVALUATION OF THE PROPULSIVE POWER OF SHIPS</title>
      <link>https://trid.trb.org/View/440676</link>
      <description><![CDATA[The paper deals with a new approach to the estimation of power and of the main dimensions of ships by using reduced model equations.  The estimation of power is founded on the analysis and modelling of energy losses for ship hull and propulsion complex and on concentration of all losses in only one balance equation.  Formulas for main dimensions with power requirements near the optimum for given values of service speed and displacement for single screw ships with Froude numbers Fn<0,3 are given.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/440676</guid>
    </item>
    <item>
      <title>POWER PREDICTION OF FULL SCALE SWATH SHIPS</title>
      <link>https://trid.trb.org/View/442532</link>
      <description><![CDATA[A computational tool to estimate the power of the full scale SWATH ship is described and compared with the full scale test results of two SWATH ships, showing an excellent correlation between the two results.  The tool is used to find an optimum SWATH configuration with regard to resistance at higher speeds, showing that the hull forms of the presently existing SWATH ships at seas can be improved to achieve speeds higher than the present levels by one to two knots or more with little cost of seakeeping performance.  The resistance characteristics of a twin strut SWATH model and a single strut SWATH model with regard to resistance are also assessed.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/442532</guid>
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