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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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    <item>
      <title>HYDRODYNAMIC CHARACTERISTICS OF FLAPPED RUDDERS</title>
      <link>https://trid.trb.org/View/161704</link>
      <description><![CDATA[Water-tunnel experiments were performed to determine the free-stream characteristics of a series of 12 rudders with systematic variations in the amount of flap area and flap balance.  The results include lift, drag, rudder moment and flap moment coefficients for a range of angles of attack and flap deflections.  A comparison is made of the effectiveness of all-movable rudders, rudders with a fixed skeg and movable flap, and rudders with movable skegs and flaps.  The latter were found to be by far the most effective.  Rudders with fixed skegs are inferior to all-movable rudders unless the proportion of flap is very large.  Flap balance does not appear desirable.  Maximum flap moments, even with zero balance, are generally less than or comparable to the maximum moment of an ideally balanced all-movable rudder.]]></description>
      <pubDate>Wed, 19 Nov 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/161704</guid>
    </item>
    <item>
      <title>VIBRATORY FORCES ON A SIMULATED HULL SURFACE PRODUCED BY TRANSIENT PROPELLER CAVITATION</title>
      <link>https://trid.trb.org/View/74164</link>
      <description><![CDATA[An experimental setup is described for the measurement of propeller-induced vibratory force on a simulated segment of hull surface located above a model propeller operating in a water tunnel.  Measurements are made of the influence of transient cavitation induced by a wake screen on the vibratory force.  These experiments confirm recent observations that, in many cases, hull vibratory excitation is completely dominated by transient propeller cavitation.]]></description>
      <pubDate>Sat, 29 Jul 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/74164</guid>
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      <title>HYDRODYNAMIC DRAG OF THREE-DIMENSIONAL BODIES BY MEANS OF A LASER DOPPLER WAKE SURVEY</title>
      <link>https://trid.trb.org/View/71664</link>
      <description><![CDATA[An investigation of the application of Laser Doppler Anemometry to the determination of hydrodynamic drag by means of a wake survey is described.  The experimental study, which was limited to viscous drag, is discussed.  The particular objects studied were a MIT Series of yacht keels, with the without turbulence stimulation, at varying angles of attack, and varying Reynolds number.  A discussion is given of the theory relating to the calculation of drag from a wake velocity survey.  A series of guidelines are given for the use of the Laser Doppler Anemometer System for future studied in the MIT Water Tunnel facility.  Graphs and tabulated results of the calculated drag coefficients versus Reynolds number are given, along with a commentary on the particular results.]]></description>
      <pubDate>Wed, 03 May 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/71664</guid>
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      <title>A NOTE ON THE DETERMINATION OF CAVITATION NUCLEI DISTRIBUTIONS BY HOLOGRAPHY</title>
      <link>https://trid.trb.org/View/72726</link>
      <description><![CDATA[The purpose of this brief note is to describe the holographic technique and the equipment used to determine nuclei distribution in a water tunnel.  Some of the resulting distributions are presented and compared with those of other investigations.]]></description>
      <pubDate>Wed, 03 May 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/72726</guid>
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    <item>
      <title>FLOW VISUALIZATION (A BIBLIOGRAPHY WITH ABSTRACTS)</title>
      <link>https://trid.trb.org/View/43288</link>
      <description><![CDATA[Citations of Federally-funded research cover all major studies concerning flow visualization for wind and water tunnel testing. The visualization methods described include those using smoke, water vapor, electron beams, dyes, oils, bubbles, and particles. While many of these studies cover the use of flow visualization techniques to solve specific problems, they have been included because they could be applicable to other areas of research. Schlieren and shadowgraph, as well as holographic techniques are excluded. (This updated bibliography contains 171 abstracts, 61 of which are new entries to the previous edition.) See also NTIS/PS-76/0338, Holographic Flow Visualization.]]></description>
      <pubDate>Sat, 04 Sep 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/43288</guid>
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    <item>
      <title>PROGRESS REPORT FOR FY 73-74 FOR THE NSRD/ARL COOPERATIVE HYDROFOIL RESEARCH PROGRAM</title>
      <link>https://trid.trb.org/View/31302</link>
      <description><![CDATA[Items discussed are design of three component balance system, modification of planar motion mechanism, analysis of gas distribution system and water tunnel circuit dynamics, unsteady supercavitating flow theory and tests at Langley Field.]]></description>
      <pubDate>Thu, 29 May 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/31302</guid>
    </item>
    <item>
      <title>DEVELOPMENT OF A PROCEDURE TO MEASURE UNSTEADY PROPELLER FORCES</title>
      <link>https://trid.trb.org/View/4797</link>
      <description><![CDATA[The procedure developed involves measuring the unsteady propeller forces derived from operating in a circumferentially non-uniform inflow.  This involves wake generation and survey, force measurement, and data analysis. The study was undertaken to expand the capability of the M.I.T.  Variable Pressure Water tunnel to measure the six components (a force and moment in three dimensions) of unsteady propeller force.  This is accomplished by foil and semiconductor strain gages applied to the stiff driveshaft on which the propeller is mounted.  These signals are amplified, signal averaged, and computer analyzed for harmonic content.  Strain gage waterproofing and electrical wiring problems encountered resulted in a limiting of the effective to partial dynamometer operation. This necessitated a more detailed description of the apparatus than usual, so that future experimenters may use component capability.]]></description>
      <pubDate>Sat, 29 Sep 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/4797</guid>
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      <title>CAVITATION ON HEMISPHERICAL NOSED TEFLON BODIES</title>
      <link>https://trid.trb.org/View/12171</link>
      <description><![CDATA[In a high speed water tunnel, incipient and desinent cavitation are investigated on a series of hemispherical nosed teflon bodies.  The results are compared with those measured previously on a series of stainless steel bodies. The experiments cover a wide range of flow velocities and air contents of water.  Large differences, both in cavitation appearance and in desinence and inception values are found between the teflon and stainless steel bodies. While desinent cavitation on the stainless steel bodies was probably caused by stream nuclei, it is shown that cavitation on the teflon bodies is produced by surface nuclei.]]></description>
      <pubDate>Fri, 04 May 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/12171</guid>
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      <title>LASER DOPPLER ANEMOMETER FOR WATER TUNNEL APPLICATIONS</title>
      <link>https://trid.trb.org/View/12147</link>
      <description><![CDATA[A laser Doppler anemometer for three-dimensional velocity measurement in liquids and gases under a wide range of laboratory conditions has been developed.  The instrument is particularly well suited for water tunnel applications.  It is portable, easily aligned, and inexpensive (excluding electronic units).  It operates in backscatter or forward scatter mode.  In both cases all optical components, including laser and photomultiplier, remain on a common base.  The system has built-in traversing capability and an aiming device for visualizing the focal (test) point. Design details and representative velocity measurements are given.]]></description>
      <pubDate>Fri, 13 Apr 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/12147</guid>
    </item>
    <item>
      <title>CAVITATION NUCLEI SIZE DISTRIBUTION IN HIGH-SPEED WATER TUNNEL UNDER CAVITATION AND NON-CAVITATION CONDITIONS</title>
      <link>https://trid.trb.org/View/4550</link>
      <description><![CDATA[Gas nuclei spectra measurements obtained with our modified Coulter Counter system in cavitating and non-cavitating conditions in our High Speed Water Tunnel are reported. These show the strong diminution with time of nuclei population during runs of several days, presumably as the gas is continually forced into solution.  Total gas content during these runs is held approximately constant.  The general shape of the spectra curves then remains approximately constant with time, although strongly diminishing in amplitude.  It can be predicted by a quasi-theoretical expression which does not include any empirical constants.  Hence its applicability to tunnel flows may be quite general.  The effect of cavitation to the same tunnel velocity is to reduce nuclei content more rapidly than in its absence, even though mean tunnel pressure is less in the cavitating case.]]></description>
      <pubDate>Fri, 29 Sep 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/4550</guid>
    </item>
    <item>
      <title>COMPARISON OF SHIP-MODEL TESTS IN SLOTTED-WALL CHANNEL AND IN A TOWING TANK</title>
      <link>https://trid.trb.org/View/1517</link>
      <description><![CDATA[Previous small-scale experiments on ship models held in a water channel with slotted walls were extended by fitting a drag balance.  Models with blockage ratios of about 1 1/2 and 5 percent were used with several slot widths.  Even with the larger model, satisfactory observations of resistance and wave profiles were made which differed only slightly from those obtained when the models and balance were transferred to a large towing tank.  Part of the discrepancy was evidently caused by the stationary waves that appear spontaneously at stream Froude numbers exceding about 0.45 in a channel preceded by a contraction.  The addition of a small ridge across the bed of the contraction almost annulled these waves over a small range of stream velocity, and then the observations in the channel and in the tank were nearly identical.]]></description>
      <pubDate>Fri, 07 May 1971 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/1517</guid>
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