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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>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>GEAR CHANGING BEHAVIOUR OF CAR GEARBOX SYNCHRONIZATION</title>
      <link>https://trid.trb.org/View/386816</link>
      <description><![CDATA[The investigation carried out in the context of this work gives information on the parameters causing gearbox scraping noises. Complete removal of the fault cannot always be guaranteed due to variations of the operating parameters or a slight modification of the geometry of the mass production parts, as many of the examined influences affect scraping in gearchanging in contrary ways.  The proposed new design gives instructions in principle on avoiding scraping noises in gearchanging and were able to be tested by random sampling in this work.]]></description>
      <pubDate>Tue, 26 Apr 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/386816</guid>
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      <title>MARINE GEARING</title>
      <link>https://trid.trb.org/View/151657</link>
      <description><![CDATA[This book outlines the many advances which have taken place in the development of modern marine gearing and updates gear design, construction, installation and operation. Comprehensive treatment is given to gear hobbing and gear grinding machines; tooth loading and distribution corrections; results of tests and experience with material combinations; single and double-helical gears; gearing configurations; types of epicyclic gears; applications to single and multiple diesel engines; reversing with steam turbines, diesel engines and gas turbines; reversing with epicyclic gearing; SSS clutches; MAAG synchronous clutch coupling; gear couplings; lubrication systems; adjustable bearing housings; journal, main wheel and thrust bearings; vibration; kinematics of tooth meshing; oil/material combinations; pitting and tooth breakage; gear damage; noise.]]></description>
      <pubDate>Wed, 08 Oct 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/151657</guid>
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      <title>NOISE EXPOSURE AND CONTROL ON FIXED MARINE STRUCTURES</title>
      <link>https://trid.trb.org/View/60692</link>
      <description><![CDATA[Machinery noise sources on drilling and producing platforms include engines, turbines, gears, generators, pumps and compressors.  Noise transmission is both structureborne and airborne.  Exposure evaluation requires consideration of work shifts ranging up to 12 hours per day, seven days in a row.  Exposure time is not limited to the work shift for those who must live on the structure.  The design problem is to avoid or eliminate excessive noise levels.  If this is not feasible, noise levels are minimized both as to intensity and the physical area affected by use of quite machinery.  Enclosure and/or other acoustical treatment is then used to bring exposure within acceptable limits. Examples of noise sources and control measures are illustrated by case histories.]]></description>
      <pubDate>Wed, 29 Mar 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/60692</guid>
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      <title>TRUCK NOISE IV-A: PROJECT SUMMARY - THE REDUCTION OF NOISE LEVELS ON THE INTERNATIONAL HARVESTER QUIETED TRUCK</title>
      <link>https://trid.trb.org/View/63464</link>
      <description><![CDATA[Truck noise is a complex interaction of many noise sources which can be isolated and studied on an individual basis. Significant reductions in diesel truck noise can be achieved with the current state-of-the-art by using a systematic approach on each major source of noise. Cooling system noise was reduced through a series of modifications which permitted a reduction in fan speed with no sacrifice in cooling ability. Exhaust system noise was reduced by using improved, large volume mufflers and muffler wraps. Intake system noise was reduced by adding a silencer between the air cleaner and the engine together with changing the type of rain cap. Engine noise was reduced by acoustical shielding in the form of either close-fitting covers or a partial enclosure. These modifications were accompanied by increases in weight and length of the truck, along with increases in initial cost and maintenance cost. In the long run, a portion of these cost increases can be recovered by improved fuel economy resulting from lower cooling fan horsepower. Future development efforts should be directed toward improved ways of reducing the engine noise, improved mufflers having reduced weight, methods of reducing pipe shell noise and improved exhaust joints.]]></description>
      <pubDate>Wed, 16 Feb 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/63464</guid>
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      <title>TRUCK NOISE IV-B IDENTIFYING THE SOURCES OF NOISE ON A HEAVY DUTY, DIESEL TRUCK</title>
      <link>https://trid.trb.org/View/29134</link>
      <description><![CDATA[Truck noise is a complex interaction of many noise sources which can be individually studied using a technique referred to as Noise Source Identification. During Source Identification, all known or suspected noise sources are artificially silenced except the one being studied. Using this technique, it was shown that the total vehicle noise of 88 dB(A) was caused primarily by the cooling system noise (86 dB(A)), the exhaust system noise (83 dB(A)) and the engine (78 dB(A)). Also identifiable were the intake system noise (74 dB(A)), the transmission noise (71 dB(A)) and all other noise sources (mostly tires at 64 dB(A)). Generally, each of the noise sources reaches its maximum noise output at a different location during the drive-by test; in fact, different sources were predominant during different portions of the drive-by. In order to achieve the program goal of 78 dB(A) for the overall truck with the use of an engine enclosure, it is necessary to reduce the noise level of each of the five major sources to approximately 71 dB(A).]]></description>
      <pubDate>Fri, 05 Nov 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/29134</guid>
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    <item>
      <title>A COMPREHENSIVE REVIEW OF HELICOPTER NOISE LITERATURE</title>
      <link>https://trid.trb.org/View/29187</link>
      <description><![CDATA[This report summarizes the state-of-the-art in helicopter noise. It includes a bibliography of reports on all components of helicopter noise including main rotor, tail rotor, engine and gearbox. Literature on helicopter noise reduction and subjective evaluation of helicopter noise were also included. Capsule summaries of important reports are included which describe the purpose of the report, summarizes the important results, compares the report with others on the same subject, and provides a critical evaluation of the work presented. It is concluded that the available prediction methodology provides a means for estimating helicopter sources on a gross basis. However, the mechanisms of noise generation are still not fully understood, although the experimental and theoretical tools are now available to conduct the definitive experiments and establish the mathematical models needed for accurate definition of helicopter noise generation mechanisms. Spectrum analyses of helicopter noise show that main rotor, tail rotor, and engine sources contribute significantly to annoyance. In cases where these sources have been heavily suppressed, gearbox noise will also appear as a significant contributor to annoyance. Therefore, quieter helicopters must include suppression of all of these components. For certification, the liter]]></description>
      <pubDate>Fri, 05 Nov 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/29187</guid>
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      <title>POWER TRANSMISSION AND AUTOMATION FOR SHIPS AND SUBMERSIBLES</title>
      <link>https://trid.trb.org/View/33877</link>
      <description><![CDATA[Describes in detail the various gear forms and transmission systems available for ship propulsion and their manufacture. In drawing upon the studies made at Annapolis and elsewhere it points the way in which new techniques, including those from the aerospace and aviation industry, can be profitably applied to the mercantile marine, as well as to naval ships. Eight chapters analyse gear design, gear arrangement concepts high ratio drives, hydrodynamic drives, common critical problems, ship automation and cargo carrying submarines.]]></description>
      <pubDate>Wed, 21 Apr 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/33877</guid>
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      <title>FIRST REPORT ON STATUS AND PROGRESS OF NOISE RESEARCH AND CONTROL PROGRAMS IN THE FEDERAL GOVERNMENT. VOLUME 1: REPORT ON STATUS AND PROGRESS</title>
      <link>https://trid.trb.org/View/29488</link>
      <description><![CDATA[Issued in compliance with Section 4(c)(3) of the Noise Control Act of 1972 (PL 92-574), this report describes Federal noise control and research activities and establishes a baseline of agency program information that may be used in subsequent years to assess progress in the Federal Government's noise control efforts. Thirty-nine Federal agencies were requested to submit information on their noise related activities to EPA. Volume I of the report contains a summary and assessment of reported activities which are described both by agency and by the following functional areas: noise standards and regulations, noise abatement, hearing conservation, technical assistance, and research.]]></description>
      <pubDate>Wed, 05 Nov 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/29488</guid>
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    <item>
      <title>SOUND GEAR QUALITY</title>
      <link>https://trid.trb.org/View/12023</link>
      <description><![CDATA[Noise and vibration in gearing are related and can be real measures of quality.  Whereas noisy gears may indicate premature wear and failure, smooth and quiet operation indicates long life.  A discussion of the designing of gears for quiet operation is presented, with emphasis on accuracy, precautions, and noise reducing materials considered, as well as possible sources of gear-system noise.]]></description>
      <pubDate>Mon, 19 Mar 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/12023</guid>
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