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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>Research on prediction and optimization of low-frequency noise in loader cabs</title>
      <link>https://trid.trb.org/View/2437606</link>
      <description><![CDATA[Low-frequency noise caused by structural vibration has a significant impact on the comfort of wheel loader drivers. To reduce the adverse effects of vibration noise on drivers and improve their comfort, this study proposes a low-noise structural optimization method based on an approximate model. To accurately obtain the vibration noise data of the wheel loader’s driver cab, a designed experiment was conducted to collect vibration and internal noise data under specific working conditions. The frequency response method and panel acoustic contribution analysis method were used to analyze the structural vibration characteristics and acoustic response characteristics of the driver cab, respectively. The panels that have a significant impact on the vibration noise of the driver cab were identified, and their thicknesses were defined as design variables to establish an optimization model. Meanwhile, a response surface method was used to construct an approximate model, and the NSGA-II algorithm (Non-dominated Sorting Genetic Algorithm-II) was used to solve the optimization model and obtain the optimized driver cab structure. The results show that the maximum noise peak (117 Hz) of the loader cab was successfully reduced by 2.9 dB after optimization. This result demonstrates the effectiveness and feasibility of the proposed method.]]></description>
      <pubDate>Thu, 05 Dec 2024 09:38:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/2437606</guid>
    </item>
    <item>
      <title>Low Noise Cabin Design for Construction Equipment</title>
      <link>https://trid.trb.org/View/1828738</link>
      <description><![CDATA[Recently, the noise regulations are being reinforced to restrict the noise levels in the workplace and to protect the operator on the construction equipment. So, the cabin noise level is one of the crucial barometers determining the quality of construction equipment.         In this paper, numerical and experimental studies for the identification of noise sources and noise transmission paths were carried out for the cabin noise control of construction equipment. First of all, measurements of sound absorption, transmission and radiation noise were performed using cabin assembly models. Noise contribution factors of cabin components were obtained through these measurements. Using these results, cabin noise levels were re-analyzed. The calculated noise levels for cabin model were confirmed to agree well with measurement results within 3dB [1]. Furthermore, acoustic resonance can be avoided at the design stage to control the booming noise.         The established method was applied to wheel loader for prediction and control of cabin noise. It is expected to be very helpful in the design stage for low noise construction equipment.]]></description>
      <pubDate>Thu, 09 Dec 2021 10:36:53 GMT</pubDate>
      <guid>https://trid.trb.org/View/1828738</guid>
    </item>
    <item>
      <title>Correlating Noise Sources Identified by Beamforming with Sound Power Measurements</title>
      <link>https://trid.trb.org/View/1804544</link>
      <description><![CDATA[Farfield beamforming is a powerful tool for identifying spatially distributed noise sources. The technique yields an image of the relative sound levels within the measurement aperture. The latest version of the beamforming software is now able to estimate the total power within its measurement aperture. In this work, the noise sources on three types of construction equipment are imaged with a beamforming array, while simultaneously the radiated sound powers are determined by a six-microphone hemisphere per ISO 6393 or ISO 6395. Of particular interest are: noise induced by turbulent flow at the exit of an exhaust stack, the effect of a noise reduction package in the engine compartment, and crawler track noise during motion. The absolute levels of the mapped source regions are compared with the total radiated sound power.]]></description>
      <pubDate>Thu, 09 Dec 2021 10:26:15 GMT</pubDate>
      <guid>https://trid.trb.org/View/1804544</guid>
    </item>
    <item>
      <title>Sound Quality Target Development Process for Agricultural and Construction Machinery</title>
      <link>https://trid.trb.org/View/1785397</link>
      <description><![CDATA[Sound quality has become an important factor in determining customer perception of overall vehicle quality and value in the automotive industry [1]. Recently, in the agricultural and construction machinery industry, the concept of sound quality has gained merit as a possible vehicle for delivering quieter products to customers [2]. This paper studies the application of sound quality methodology for agricultural and construction machinery. Accordingly, the state of agricultural and construction machinery sound quality in the market place is evaluated and sound quality metrics that correlate well with the customers' subjective preferences are identified. The relevance of the chosen sound quality metrics is established by combining the results of the listening-jury evaluation and the requirements for product noise control as driven by competition and regulations. The process of cascading the overall product sound quality targets to the subsystem targets to facilitate sound quality improvements through necessary design changes is also addressed.]]></description>
      <pubDate>Thu, 09 Dec 2021 10:17:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/1785397</guid>
    </item>
    <item>
      <title>The control of noise pollution in road construction plant</title>
      <link>https://trid.trb.org/View/1206824</link>
      <description><![CDATA[As a result of pressure exerted by NAASRA, other authorities and the concerned buying public most manufacturers and suppliers are taking positive steps to reduce the noise emission in road construction plant used in South Australia.  It is becoming realised that the noise problem must be engineered out at the design and manufacturing stage to ensure that noise levels at the construction site will not adversely affect the operators and bystanders hearing.]]></description>
      <pubDate>Fri, 24 Aug 2012 21:57:39 GMT</pubDate>
      <guid>https://trid.trb.org/View/1206824</guid>
    </item>
    <item>
      <title>High idle as a predictor of noise exposure</title>
      <link>https://trid.trb.org/View/1181398</link>
      <description><![CDATA[]]></description>
      <pubDate>Fri, 24 Aug 2012 03:24:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/1181398</guid>
    </item>
    <item>
      <title>SMART CONSTRUCTION : USING CUTTING-EDGE TECHNOLOGY TO MAXIMIZE PUBLIC INVESTMENT IN AMERICA'S TRANSPORTATION NETWORK</title>
      <link>https://trid.trb.org/View/682796</link>
      <description><![CDATA[This article presents an overview with case studies and examples of deploying "smart" technologies in highway construction. Examples include context sensitive design on Oahu in Hawaii, noise control techniques, permanent environmental remediation and improvements in the Boston Central Artery/Tunnel Project, using computer-assisted design for public outreach and for integrating design and construction, new pavement technologies and materials, robotic controls, GPS-guided construction, positive guidance technologies for work zone safety and traveler information/congestion management and nanotechnology and remote sensing for infrastructure monitoring and maintenance.]]></description>
      <pubDate>Wed, 03 Dec 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/682796</guid>
    </item>
    <item>
      <title>FIRST-EVER NOISE CANCELLATION SYSTEM ON FINCANTIERI CRUISESHIP</title>
      <link>https://trid.trb.org/View/479966</link>
      <description><![CDATA[See also the previous abstract.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/479966</guid>
    </item>
    <item>
      <title>ANC; NEW NOISE CONTROL TECHNOLOGY</title>
      <link>https://trid.trb.org/View/479965</link>
      <description><![CDATA[What is believed to be the first application of so-called active noise control, or ANC, has been made on a recently completed cruise liner. The technology uses fast-acting electronics, speakers and elaborate software to generate phase-shifted noise for intercepting and suppressing medium- and low-frequency noise from fans, pumps, motors and engines.  See also the following abstract.]]></description>
      <pubDate>Thu, 27 Mar 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/479965</guid>
    </item>
    <item>
      <title>NOISE GENERATION IN MARINE MOTORS</title>
      <link>https://trid.trb.org/View/466966</link>
      <description><![CDATA[High power, low speed electrical machines are proposed as drives for frigate propulsion applications.  The noise and vibration generated by such systems are discussed in this paper.  The mechanisms of noise generation in an electrical machine are identified and the effects of irregularities on the machine frame are investigated, using both theoretical and experimental analyses.  A new time domain method of calculation is used to perform these calculations, which can be conveniently linked to other computer models of large power electronics drives.  This calculation is performed for a laboratory machine fed from a quasi-square wave inverter and also for a proposed cycloconverter-induction motor drive system.  It is shown that small amplitude flux components should not be ignored as they can induce considerable vibration if they are close to one of the motor mechanical resonance frequencies.]]></description>
      <pubDate>Fri, 01 Nov 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/466966</guid>
    </item>
    <item>
      <title>NOISE PERFORMANCE OF SWATH VESSELS - AN EXPERIMENT ON A SMALL SWATH</title>
      <link>https://trid.trb.org/View/437944</link>
      <description><![CDATA[Swath vessels are an alternative to conventional monohulls for some naval roles. Among other benefits the opportunity to install most major noisy machinery items in the deck structure remote from the submerged hulls is seen as an attractive way of reducing underwater noise. The underwater noise radiation due to excitation on hull and deck structures of a small SWATH has been examined on an acoustic range using both direct and reciprocal techniques. Differences have been assessed in terms of both radiated sound transfer functions and acoustic power loss.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/437944</guid>
    </item>
    <item>
      <title>STRUCTUREBORNE NOISE CONTROL ON CRUSE SHIPS</title>
      <link>https://trid.trb.org/View/446066</link>
      <description><![CDATA[Noise control onboard ships has become a common practice, especially on cruise ships.  The supplier of the propulsion unit and gen-sets is called upon to undertake specific commitments as to noise level at his own interface.  Taking as a reference the diesel- electric propelled cruise ships, the paper illustrated the procedure followed by the authors' company to phase out the structureborne noise problem on the hull foundation, where target values are quite strict.  Each ship is powered by five gensets, three of which are engined with GMT-Sulzer 8ZAL40S and the other two with 12ZAV40S.  In each set the engine and the electric machine are rigidly mounted on a common raft, and each is connected through an elastic coupling.  The raft is resiliently mounted on two rows of inclined mounts (sandwich type).  A detailed discussion is undertaken regarding the characteristic elements.  As a results of a preliminary acoustic estimation of the ship, based on these elements, the noise level was shown to be higher than required at the middle- range frequencies, and hence the necessary improving actions are examined and a more accurate estimation of the noise level is drawn on the basis of the recorded data.  This paper reports the results recorded on the first ship which proved the validity of the estimation.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/446066</guid>
    </item>
    <item>
      <title>SOUND POWER MEASUREMENT OF NOISE SOURCE BY SOUND INTENSITY TECHNOLOGY</title>
      <link>https://trid.trb.org/View/441809</link>
      <description><![CDATA[No abstract provided.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/441809</guid>
    </item>
    <item>
      <title>STUDIES ON THE REDUCTION OF THE NOISE CAUSED BY THE COMBUSTION PROCESS IN A DIRECT INJECTION DIESEL ENGINE: PART 2 - PISTON SLAP NOISE</title>
      <link>https://trid.trb.org/View/437743</link>
      <description><![CDATA[The mechanism of the piston-liner impact responsible for the mechanical noise known as "piston slap" is shown, explaining the functional dependence between the engine bore and the level of sound pressure. Experimental results in geometrically similar singlecylinder diesel engines are reported, showing the benefits attainable through systems which can check the mechanical noise induced by piston slap.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/437743</guid>
    </item>
    <item>
      <title>GENERAL CONSIDERATIONS ON THE DIESEL ENGINE NOISE</title>
      <link>https://trid.trb.org/View/437398</link>
      <description><![CDATA[The characteristic dependence of noise generated on the geometrical functional parameters of diesel engines is defined according to fundamental theoretical formulations. The influence of different combustion systems is analysed by experimental and theoretical results. The influence of the cooling system on engine noise is examined.]]></description>
      <pubDate>Mon, 14 Aug 1995 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/437398</guid>
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