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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>Comparison and validation of numerical methods to assess hydrodynamic loads on mechanical coupling of multiple bodies</title>
      <link>https://trid.trb.org/View/1575368</link>
      <description><![CDATA[In the design of articulated systems, accurate prediction of loads on mechanical couplings is important for the dimensioning of the coupling, as well as an assessment of local and global structural loads. The paper studies a twofold pushing convoy in shallow water. Several numerical approaches for the prediction of articulation loads are compared with each other and with model tests. Kinematic constraints are applied to couple the bodies at articulation points to model hinge and rigid mechanical couplings. For comparison, contact elements are also used to simulate hinges. Depending on the articulation model numerical computations are conducted in frequency or time domain. Comparison between different numerical methods and with model experiments shows that the proposed methods can predict articulation loads with sufficient accuracy for design purposes. The frequency domain approach with kinematic constraints seems more suitable to compute the hinge coupling forces than time-domain simulations with contact elements.]]></description>
      <pubDate>Tue, 26 Feb 2019 09:41:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/1575368</guid>
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    <item>
      <title>Comparison of piston and tangential pneumatic flexible shaft couplings in terms of high flexibility</title>
      <link>https://trid.trb.org/View/1567363</link>
      <description><![CDATA[The optimal tuning of mechanical systems in terms of torsional vibration magnitude is a very important function in flexible shaft couplings. Therefore, a flexible coupling with suitable dynamic properties, particularly dynamic torsional stiffness, has to be carefully chosen for each specific application. The current trend in the field of flexible shaft couplings, and the most noticeable in the automotive industry, is the development and utilization of highly flexible couplings, which means flexible couplings with a very low value of relative torsional stiffness. The aim of this article is to introduce a new type of flexible shaft coupling: a piston pneumatic flexible shaft coupling. This coupling was developed to improve the properties of pneumatic flexible couplings, especially the maximum angle of twist, in order to create a highly flexible pneumatic coupling. For illustration purposes, the piston pneumatic coupling is compared with the tangential pneumatic flexible shaft coupling of Type 3-1/110-T-C in terms of high flexibility characteristics, whereby the characteristic dimensions of both couplings are the same. Given that the piston pneumatic coupling has not been manufactured to date, only a computational model of this coupling was used. The results show that the design of the piston pneumatic flexible shaft coupling combines the advantages of a highly flexible and pneumatic shaft coupling.]]></description>
      <pubDate>Thu, 27 Dec 2018 10:59:22 GMT</pubDate>
      <guid>https://trid.trb.org/View/1567363</guid>
    </item>
    <item>
      <title>Contribution and perspectives of new flexible shaft coupling types – pneumatic couplings</title>
      <link>https://trid.trb.org/View/1567065</link>
      <description><![CDATA[The contribution briefly approaches the author’s profile in the field of scientific research during his work at TU in Košice. More precisely, it presents a selected, specific area of torsional oscillation of mechanical systems concerning the characteristics, research and application of new elements, i.e., so-called pneumatic tuners of torsional oscillation (pneumatic couplings), a field that the author has long been devoted to. In the process, the article informs the reader about the development of new types of flexible shaft couplings, i.e., tangential and differential pneumatic couplings (also with autoregulation), presents the results of static and dynamic measurements made on certain couplings with the interconnection of pneumatic flexible elements and draws attention to the conditions involved in the application of these coupling types in torsionally oscillating mechanical systems.]]></description>
      <pubDate>Thu, 27 Dec 2018 10:59:22 GMT</pubDate>
      <guid>https://trid.trb.org/View/1567065</guid>
    </item>
    <item>
      <title>Stress-strain state of pneumatic flexible shaft coupling for ball mill drives</title>
      <link>https://trid.trb.org/View/1567296</link>
      <description><![CDATA[The article explores the stress-strain state of the pneumatic flexible shaft coupling of the tumbling mill drive using a software of finite element analysis. The study has revealed that the stress-strain state of the pneumatic flexible shaft coupling is characterized by an uneven general and local distribution of stresses. Areas of maximum stress and strain in the pneumatic flexible shaft coupling have been defined. The study allowed for changing the geometry and reducing the mass of the disc of the pneumatic flexible shaft coupling with a slight change in stresses and strains. The results of the study can be applied to the design of pneumatic flexible shaft couplings and serve as a basis for further research.]]></description>
      <pubDate>Mon, 26 Nov 2018 10:05:56 GMT</pubDate>
      <guid>https://trid.trb.org/View/1567296</guid>
    </item>
    <item>
      <title>Effect of Local Stiffness Coupling on the Modes of a Subframe-Bushing System</title>
      <link>https://trid.trb.org/View/1433238</link>
      <description><![CDATA[The elastomeric joints (bushings or mounts) in vehicle structural frames are usually described as uncoupled springs (only with diagonal terms) in large scale system models. The off-diagonal terms of an elastomeric joint have been previously ignored as they are often unknown since their properties cannot be measured in a uniaxial elastomer test system. This paper overcomes this deficiency via a scientific study of a laboratory frame that is designed to maintain a high fidelity with real-world vehicle body subframes in terms of natural modes under free boundaries. The steel beam construction of the laboratory frame, with four elastomeric mounts at the corners, permits the development of a highly accurate, yet simple, beam finite element model. This allows for a correlation study between the experiment and model that helps shed light upon the underlying physical phenomenon. In particular, the effect of local stiffness coupling of elastomeric bushings or mounts is demonstrated through computational modeling and experimental validation. It is seen that the joint stiffness matrices strongly influence the modal properties of a laboratory subframe-mount system. For instance, a strong correlation between the rigid body modes (r = 1 to 6) and the first three elastic modes (r = 7 to 9) is only possible when the coupling (non-diagonal) terms are included in the bushing model.       ]]></description>
      <pubDate>Mon, 23 Oct 2017 13:42:04 GMT</pubDate>
      <guid>https://trid.trb.org/View/1433238</guid>
    </item>
    <item>
      <title>Numerical simulation of fatigue behavior for cable-stayed orthotropic steel deck bridges using mixed-dimensional coupling method</title>
      <link>https://trid.trb.org/View/1480820</link>
      <description><![CDATA[Effective methods and technologies in fatigue behavior and assessment for cable-stayed orthotropic steel deck bridges are critical to ensure their safety and serviceability. In this study, a mixed-dimensional finite element coupling method is used for structural fatigue assessment. A general framework of the Mix-dimensional Coupling (MDC) method is constructed on the basis of a compromise between simplicity and efficiency as compared to conventional sub-modeling or substructure method. Fatigue details and performance at welded joints have been investigated through the MDC method. Efficiency of the MDC method is demonstrated by a comparison with the simplified Bridge-deck-system (BDS) method. Besides the benefits of the saving time, the numerical simulation also indicated that the MDC method can effectively capture the global behavior for better fatigue prediction, that be ignored in the conventional BDS method as expected. Findings suggest that the MDC method is a cost-effective alternative for fatigue behavior and fatigue assessment of large-span orthotropic steel deck bridges.]]></description>
      <pubDate>Mon, 25 Sep 2017 14:10:35 GMT</pubDate>
      <guid>https://trid.trb.org/View/1480820</guid>
    </item>
    <item>
      <title>Clevis couplings in multi vehicle combinations</title>
      <link>https://trid.trb.org/View/1477436</link>
      <description><![CDATA[This article addresses the issue of dimensioning the coupling equipment in multi vehicle combinations. Extensive measurements have been performed. The measurements are made on the clevis couplings in the combinations. Measurements are made on highways, rural forest roads as well as on test tracks.  A filtering concept that enables the separation of effects from different force generating mechanisms has been developed. Based on observation from the analyses qualitative models are set up for the force generating mechanisms.  The results show that the margin between the measured force magnitudes and the requirements calculated using the Australian rules is wide.  Further results show that there is a strong relation between speed and forces generated in the couplings. In particular this holds true for forces generated by the interaction between the longitudinal unevenness and the geometrical layout of the vehicle combination.]]></description>
      <pubDate>Tue, 25 Jul 2017 09:57:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/1477436</guid>
    </item>
    <item>
      <title>The effects of safety chains on the dynamics of truck and dog trailer combinations in the event of a coupling failure</title>
      <link>https://trid.trb.org/View/1477427</link>
      <description><![CDATA[This paper describes an investigation of the effects of safety chains on the dynamics of truck and dog trailer combinations in the event of catastrophic failure of the primary pin coupling. Safety chains on drawbar couplings are not mandatory in Australia for such combinations, but are recognised as having the potential to reduce crash risk and severity of crash outcomes. Some industry stakeholders, predominantly drivers, have expressed safety concerns regarding potential unintended effects of the chains on the dynamics of the hauling unit in the event of a coupling failure. The on-road dynamics of truck and dog trailer combinations connected only by safety chains was assessed via field tests, in which dynamic performance data was recorded using a data logging system. Through analysis of the recorded data and observations made by the driver of the vehicle and other observers, it was found that neither the truck nor the trailer demonstrated unsafe behaviour in any of the tested manoeuvres. It was determined that a truck-trailer combination can be brought safely to a stop in the event of a primary connection failure, up to the highest tested speed of 80 km/h. These findings strongly indicate that there is little potential for safety concerns to arise as the result of the fitment of safety chains to drawbar couplings of these truck configurations.]]></description>
      <pubDate>Tue, 25 Jul 2017 09:56:58 GMT</pubDate>
      <guid>https://trid.trb.org/View/1477427</guid>
    </item>
    <item>
      <title>Analysis of the impact of flexible couplings on gearbox vibrations</title>
      <link>https://trid.trb.org/View/1465326</link>
      <description><![CDATA[Dangerous vibrations of mechanical systems’ components are causes of failures and reduction in service life, as well lead to negative effects on the environment and the health of operators. In order to reduce these unwanted vibrations, it is necessary to pay attention to the proper design of components in mechanical systems. The aim of this article is based on the experimental measurements and demonstration of the effects of different types of flexible couplings on the size of vibration in a gearbox that forms part of a mechanical system.]]></description>
      <pubDate>Mon, 01 May 2017 09:45:19 GMT</pubDate>
      <guid>https://trid.trb.org/View/1465326</guid>
    </item>
    <item>
      <title>Distributed Power Control Evaluation of Hard-LinkType Mobility Using Velocity and Load Data</title>
      <link>https://trid.trb.org/View/1426033</link>
      <description><![CDATA[In this study, as a new form of mobility for single-seat cars, the authors realize "hard-link-type mobility" using a mechanical coupling device. This form of mobility makes it possible to connect or disconnect the vehicles as necessary. When the vehicles are coupled, the driver of the following vehicle does not need to drive because the vehicle follows the leading vehicle semi-automatically. Therefore, it is expected that this form of mobility will serve as an effective mode of transport in areas lacking in good public transport systems. For hard-link-type mobility to be effective, it is desirable that the load on the coupling device be as low as possible. Therefore, the authors have previously proposed a vehicle control system that reduces the load acting on the device. However, this system has been evaluated using only velocity data. Therefore, in this study, the system is evaluated more quantitatively using load data, which are obtained using a load cell mounted on the coupling device.]]></description>
      <pubDate>Tue, 25 Oct 2016 10:08:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1426033</guid>
    </item>
    <item>
      <title>Chemo-mechanical Modelling of Cemented Soils, from the Microscale to the Volume Element</title>
      <link>https://trid.trb.org/View/1423030</link>
      <description><![CDATA[Sensitivity of the mechanical properties of geomaterials to chemical processes is known to bring about either strengthening or weakening effects, the latter being critical for safety assessment in a number of civil and energy engineering applications. In this work, coupling of chemical and mechanical processes in bonded geomaterials is investigated by developing a micro-structure inspired model, which is then validated against a number of different chemo-mechanical experiments on calcarenite. The model is shown to provide a flexible framework for consistent interpretation of experimental loading paths, and can be readily applied to challenging boundary value problems, such as studying the stability of slopes exposed to acid rain or predicting the effectiveness of CO₂ injection in carbonate rocks. The model can be also easily extended to materials involving cementation bonds with different composition.]]></description>
      <pubDate>Mon, 19 Sep 2016 12:42:08 GMT</pubDate>
      <guid>https://trid.trb.org/View/1423030</guid>
    </item>
    <item>
      <title>Comparison of the Accuracy of Several Bridge/Rail Coupling Models with Experimental and Numerical Results</title>
      <link>https://trid.trb.org/View/1409420</link>
      <description><![CDATA[Current demand of faster, comfortable and competitive railroad infrastructure results in the removal of older jointed rails in order to replace it with continuously welded rails (CWR). These are used for their ability to create a comfortable joint-free track supporting the minimization of dynamic impact on both the substructure and the vehicle itself. Unfortunately the placement of CWR is limited for bridges due to its interaction with the supporting structure that is coupled with the rail. The scientific  data, needed for simple and reliable analysis, isn't currently sufficient, because the values vary immensely. Therefore an extensive experimental measurement was done on the railway bridge near the town of Děčín with the intention of improving the current state of knowledge of the CWR/bridge interaction. The main goal of this paper rests on performing a numerical analysis using various numerical models of the coupling interface and the subsequent comparison with the experimental and prescribed values. The complex overview with the results of the experimental evaluation, numerical model verification and data comparison is offered in this paper, including some interesting conclusions as well. The conclusions of the paper provide advice for better numerical modelling of the bridge/track interaction.]]></description>
      <pubDate>Tue, 31 May 2016 09:14:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/1409420</guid>
    </item>
    <item>
      <title>Overcoming inertia</title>
      <link>https://trid.trb.org/View/1386900</link>
      <description><![CDATA[With drive and brake systems becoming more powerful, ingenuity from couplings manufacturers is in demand. Emmanuel Mair reports.]]></description>
      <pubDate>Mon, 04 Jan 2016 15:11:36 GMT</pubDate>
      <guid>https://trid.trb.org/View/1386900</guid>
    </item>
    <item>
      <title>Looking at options : grooved mechanical piping systems are designed to last the life of the vessel</title>
      <link>https://trid.trb.org/View/1386717</link>
      <description><![CDATA[]]></description>
      <pubDate>Mon, 04 Jan 2016 15:06:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/1386717</guid>
    </item>
    <item>
      <title>Stiffness Analysis of Curvic Coupling in Tightening by Considering the Different Bolt Structures</title>
      <link>https://trid.trb.org/View/1375379</link>
      <description><![CDATA[Curvic couplings are extensively used in aerospace machinery, such as helicopter, aero-engine, or other aircrafts. The aim of this paper is to reveal new insights into the behavior of bolted joint with curvic couplings according to the bolt geometry and physical parameters by an analytical model. The different cases are focused mainly on the different geometry characters of the bolt. The analytical results show that the compression stiffness of both the curvic and the ring part of the disc has some relationship with the curvic rotation. The curvic rotation angle and the curvic compression stiffness show a slight difference during the tightening regardless of the bolt structural parameters. However, the stiffness of the other disc parts present a more obvious difference in tightening because of the various bolt structural parameters.]]></description>
      <pubDate>Tue, 24 Nov 2015 09:29:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/1375379</guid>
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