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    <title>Transport Research International Documentation (TRID)</title>
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    <language>en-us</language>
    <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>SUPERCONDUCTING ELECTROMAGNETIC THRUSTER; PATENT</title>
      <link>https://trid.trb.org/View/412500</link>
      <description><![CDATA[An electromagnetic thruster for marine vehicles using a jet of water driven by the interaction of a mutually perpendicular intensified magnetic field and an intensified electric field is disclosed. The intensified magnetic field is produced by superconducting coils cooled by a coolant such as liquid helium. An intensified electric field is produced by passing high amperage current across the seawater jet. These interacting fields produce a Lorentz force perpendicular to mutually perpendicular electric and magnetic field vectors which is used to drive the seawater jet. In some embodiments, the force may also be used to draw water into the jet from the boundary layer flow around the vehicle thereby reducing boundary layer turbulence and associated radiated noise.]]></description>
      <pubDate>Tue, 04 Apr 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/412500</guid>
    </item>
    <item>
      <title>MAGNETOHYDRODYNAMIC BOUNDARY LAYER CONTROL SYSTEM; PATENT</title>
      <link>https://trid.trb.org/View/405968</link>
      <description><![CDATA[An active boundary layer control system for marine vehicles is disclosed. The boundary layer control system comprises a plurality of magnets and seawater electrodes placed in circumferential rows around the beam of the hull. The magnets and electrodes are positioned so that a Lorentz force generated by the interacting magnetic and electric fields will drive the boundary layer flow in an axial direction toward the aft end of the hull. The boundary control system reduces turbulence and may relaminarize boundary layer flow, thereby reducing radiated noise.]]></description>
      <pubDate>Mon, 03 Oct 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/405968</guid>
    </item>
    <item>
      <title>FLOATING FLOORS FOR NOISE REDUCTION IN SHIPS</title>
      <link>https://trid.trb.org/View/73463</link>
      <description><![CDATA[A mathematical model to be used for calculating the velocity level difference between the deck and floating floor, is described.  The frequency dependence of the velocity level difference is found to be 25--40 dB/decade, depending on the ratio of the wave number and loss factor in the two plates. Laboratory measurements of velocity level differences, radiation ratios and sound reduction indices are described. The experimentally obtained results are compared with theory, and good agreement found.]]></description>
      <pubDate>Wed, 28 Jun 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/73463</guid>
    </item>
    <item>
      <title>NOISE DUE TO THE INTERACTION OF BOUNDARY LAYER TURBULENCE WITH A MARINE PROPULSOR OR AN AIRCRAFT COMPRESSOR</title>
      <link>https://trid.trb.org/View/56374</link>
      <description><![CDATA[The sound generated by the interaction of inlet boundary layer turbulence with a rotating blade row is investigated. To experimentally study this radiated sound, an existing aeroacoustic facility was modified to produce the inflows desired. The rotor was operated in air with different blade space-to-chord ratios, different flow coefficients and different anisotropic, nonhomogeneous turbulent inflows. The inflows ingested are: (1) natural boundary layer on hub and annulus wall, (2) a tripped boundary layer on the hub, and (3) a fully developed boundary layer on the hub. The turbulence intensities and length scales were altered by placing a grid at the inlet. The sound pressure level is found to be directly proportional to the turbulence intensity squared and inversely proportional to the ratio of axial length scale to blade spacing.]]></description>
      <pubDate>Tue, 20 Sep 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/56374</guid>
    </item>
    <item>
      <title>PRELIMINARY RESULTS ON SEAMOUNT AND CONTINENTAL SLOPE REFLECTION ENHANCEMENT OF SHIPPING NOISE</title>
      <link>https://trid.trb.org/View/43238</link>
      <description><![CDATA[Measurements of ambient noise levels made during a time period when a supertanker passed the observation site clearly show such vessels to be a strong acoustic source. The tonals associated with the propeller blade rate and its frequency harmonics were clearly observed on single, omni-directional hydrophones for ranges out to 240 nautical miles.  The received signals from the radiated noise from this vessel increased in level by as much as 10 dB when it was in the vicinity of a seamount and the continental slope, suggesting a reflection enhancement. The magnitude of this observed reflection enhancement varies inversely with hydrophone depth being the largest for the shallowest depth. (Author)]]></description>
      <pubDate>Mon, 23 Aug 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/43238</guid>
    </item>
    <item>
      <title>TIME-DEPENDENT THRUST GENERATED BY A PROPELLER OPERATING IN A TURBULENT INFLOW</title>
      <link>https://trid.trb.org/View/31308</link>
      <description><![CDATA[The broadband radiated sound of a propulsor can be related to the time-dependent thrust generated by the propulsor due to operation in a randomly varying turbulent velocity field. In order to understand better the radiated sound phenomenon. An experimental and theoretical investigation of the time-dependent thrust response of a propeller due to operation in turbulent inflows having various characteristic parameters was conducted.  The experimental investigations employ an unsteady thrust balance mounted in the drive shaft of a 5-bladed free-stream propeller.  Measurements of the time-dependent thrust generated by the propeller were made for turbulent inflows having a range of characteristics length scales and a range of turbulent intensity.]]></description>
      <pubDate>Thu, 29 May 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/31308</guid>
    </item>
    <item>
      <title>MEASUREMENTS OF RADIATED NOISE FROM CAVITATING HYDROFOILS</title>
      <link>https://trid.trb.org/View/13910</link>
      <description><![CDATA[The present program of noise measurements is being conducted in the High Speed Water Tunnel at the California Institute of Technology.  It is the intent of this program to measure the noise spectrum from hydrofoil models in the 2-D working section of the water tunnel and to determine the noise dependence upon cavitation number and flow velocity. Noise from several types of cavitation is being studied. The cavity generated on the leading edge of a hydrofoil at an angle of attack has been studied extensively.  The cavity at the base of a wedge-shaped "supercavitating" hydrofoil has also been studied.  A model is under construction for the measurement of noise from a tip vortex cavity.]]></description>
      <pubDate>Thu, 24 Jan 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/13910</guid>
    </item>
    <item>
      <title>PROPELLER CAVITATION IN SOLUTIONS OF POLYETHYLENE OXIDE</title>
      <link>https://trid.trb.org/View/4483</link>
      <description><![CDATA[The inception and formation rates of bubble cavitation on a 14.8-cm diameter, two-bladed propeller were measured in homogeneous aqueous solution of polyethylene oxide.  If the results can be extended to full size propellers, ships can increase their propeller rotation rate while producing the same amount of cavitation noise.  Measurements of the radiated noise spectra of bubble collapses showed how the higher frequency components are somewhat attenuated in polyethylene-oxide solutions.]]></description>
      <pubDate>Wed, 27 Sep 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/4483</guid>
    </item>
    <item>
      <title>ENGINEERING GUIDE AND COMPUTER PROGRAMS FOR DETERMINING TURBULENCE-INDUCED VIBRATION AND RADIATION OF PLATES</title>
      <link>https://trid.trb.org/View/2130</link>
      <description><![CDATA[The report is an engineering guide to the use of the Dyer method of manual computation and to several computer programs for determining turbulence-induced vibration and radiation of finite plates in air and in water.  Both simple and clamped boundary conditions are treated.  The Dyer method and the computer programs are presented in a series of appendixes:  Bolt Beranek and Newman manual method; Boeing program I; Electric Boat program; Underwater Sound Laboratory program; Boeing program II--finite element.  The documentation is intended to facilitate the performance of flow-induced vibroacoustic computations as well as to furnish the groundwork for future research.  (Author)]]></description>
      <pubDate>Fri, 04 Feb 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2130</guid>
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