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    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
    <description></description>
    <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>
    </image>
    <item>
      <title>Engineering Practice of Sealing Design and Testing Technology for the Solar Array Drive Assembly of Tianhe Core Module</title>
      <link>https://trid.trb.org/View/2742592</link>
      <description><![CDATA[The Core Module of the space station is the first module of China’s Space Station, responsible for controlling the key parameters such as orbit, speed, and pressure of the entire space station, and serving as the control center of the assembly. The Solar Array Drive Assembly is a part of the Core Module. It needs to participate in the functional requirements of the whole cabin sealing of the cabin body, so it adopts the design scheme of semi-sealed. By adjusting the compression ratio and volume fraction of the sealing ring, and the roughness of the sealing surface, the overall sealing performance is improved. A small cavity leak detection hole is added to realize the sealing effect of detecting the second-layer seal separately. The real leakage rate of the drive mechanism is detected effectively by using multiple calibration schemes in the leak detection process, and the semi-sealing technology of the Solar Array Drive Assembly is verified, which has guidance and reference significance for the subsequent spacecraft design requiring a sealing function.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:53 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742592</guid>
    </item>
    <item>
      <title>Research on Sealing and Vibration Reduction Performance of Large Sized Packaging Box</title>
      <link>https://trid.trb.org/View/2742571</link>
      <description><![CDATA[With the continuous development of large precision equipment, the reliability requirement for long-distance transportation is also constantly increasing. Large packaging box with sealing and vibration reduction performance is crucial during transportation. This article introduces the sealing measures for large-sized packaging box, as well as the sealing structure design methods for key parts, vibration reduction measures and the selection and design of vibration dampers. The designed packaging box has been used for long-distance transportation of various types of equipment and the reliability of sealing and vibration reduction performance has been verified in practical applications, providing reference for the design of similar packaging boxes.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742571</guid>
    </item>
    <item>
      <title>Effects of Arrangement Patterns on Static Stability and Leakage Characteristics in Hybrid Labyrinth-Honeycomb Seals</title>
      <link>https://trid.trb.org/View/2742541</link>
      <description><![CDATA[In this work, three-dimensional models of axial hole labyrinth-honeycomb seals (AHLHS) and circumferential hole labyrinth-honeycomb seals (CHLHS) were established by CFD to investigate the influence of different arrangement patterns on the static stability and leakage characteristics of two seals under choked and unchoked flow conditions and various eccentricities with different values. The results show that the two configurations have different advantageous ranges, and the hole arrangement pattern will not significantly change the pressure difference distribution between the two seals. Under most studied conditions, AHLHS maintains lower absolute values of stiffness coefficients, pressure difference groove, and negative cross-coupled stiffness coefficients, resulting in higher stability.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742541</guid>
    </item>
    <item>
      <title>Evaluating Volume and Hardness change in Fluorocarbon and Ethylene Propylene
     Rubber Elastomers: Effects of Fluid Aging</title>
      <link>https://trid.trb.org/View/2712142</link>
      <description><![CDATA[Abstract:  This research paper investigates the performance of FKM (Fluorocarbon) seal material when exposed to a 50:50 ethylene glycol-water mixture. The study aims to determine the volume change percentage and Hardness change of FKM elastomers under standardized testing conditions. The experimental approach follows ASTM D471 and ASTM 2240 guidelines, focusing on weight and hardness measurements of the test samples to establish a success criterion. The results provide critical insights into the chemical compatibility and durability of FKM elastomers in Aerospace and industrial applications where ethylene glycol-water mixtures are commonly used. The findings contribute to enhanced material selection and design considerations for sealing applications subjected to glycol-based fluids. Samples of FKM material were immersed in the fluid at controlled temperatures and durations, simulating real-world operational conditions. The primary metric of interest, volume change percentage and Hardness change, were assessed through precision measurement techniques. Weight changes before and after immersion were also recorded to correlate material absorption characteristics with the success criteria. Success thresholds were established based on industry requirements for seal integrity and operational reliability. Preliminary results indicate that FKM exhibits minimal volume expansion and hardness change under specified conditions, aligning with the acceptance criteria. These findings support the suitability of FKM seals for long-term use in coolant systems, with implications for material selection and design in demanding applications. This research contributes to the development of durable sealing solutions, ensuring reliability and safety in systems utilizing ethylene glycol-based coolants.  Keywords:  FKM, Volume Expansion, ASTM D471]]></description>
      <pubDate>Tue, 23 Jun 2026 13:36:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2712142</guid>
    </item>
    <item>
      <title>Bridging Simulation and Reality: Incorporating Seal Contact Detachment Into Stick–Slip Prediction</title>
      <link>https://trid.trb.org/View/2717301</link>
      <description><![CDATA[Noise phenomena in automobiles caused by the stick-slip effect are increasingly among the most frequent reasons for customer complaints and therefore represent a critical vehicle quality attribute. To proactively address such issues, stick-slip testing of contacting material pairs is commonly applied during development. However, the predictive capability of current stick-slip test methods remains limited, particularly when highly flexible materials and realistic, stochastic excitation conditions are involved. The flexibility of sealing systems often allows the actual relative motion at the contact interface to be accommodated through adhesion and elastic deformation, thereby delaying or even preventing sliding. To date, this effect has not been represented by any characteristic parameter in conventional stick-slip testing. Instead, existing evaluations focus exclusively on the analysis of occurring stick-slip oscillations. For the initiation of stick-slip phenomena, however, not only the mean displacement between two stick-slip oscillations during the sliding phase is relevant, but also the relative displacement required to initiate the first slip event of the sealing contact.With the algorithm developed in this work, which reproducibly determines the distance to first slip based on changes in the friction force slope, this methodological gap is now closed. The displacement to first slip depends on numerous influencing factors, including profile geometry, normal load, sliding velocity, excitation profile, and environmental conditions, and was previously inaccessible by both experimental and numerical approaches. In particular, the onset of slip in sealing contacts can now be determined under stochastic excitation of the friction pairing, thereby closely reflecting real operating conditions. As a result, the prevention of noise phenomena can be significantly strengthened at an early stage of vehicle development.]]></description>
      <pubDate>Tue, 23 Jun 2026 10:30:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/2717301</guid>
    </item>
    <item>
      <title>A Comprehensive Analysis of Sealing Methods for EV Battery Packs - Trends and Insights</title>
      <link>https://trid.trb.org/View/2712080</link>
      <description><![CDATA[The widespread adoption of electric vehicles (EVs) has introduced distinct engineering challenges, particularly in the design of battery packs, which are crucial for vehicle performance, safety, and longevity. A critical requirement is maintaining ingress protection (IP) ratings of IP67 or higher to protect the high voltage battery packs against water and dust exposure. These ratings are crucial for ensuring compliance with homologation standards and meeting the demands of diverse terrains and operating conditions. Consequently, achieving effective sealing of EV battery packs is a fundamental aspect of their design and engineering.This study presents a comprehensive analysis of sealing technologies employed in EV battery packs, focusing on four primary types: adhesive-based sealants, Formed-In-Place Gaskets, foam cut seals, and rubber gaskets. Benchmarking data collected from over 100 vehicle models across more than 50 brands provides insights into adoption trends, historical shifts, and the evolution of sealing technologies within the EV industry. The study examines potential reasons driving the choice of specific sealing methods, considering factors such as material properties, manufacturing costs, ease of application, and design considerations. While the analysis is based on industry trends and technical knowledge, it acknowledges that inferred strategies and preferences may differ slightly from the actual intentions or proprietary decisions of original equipment manufacturers (OEMs). Ultimately, this paper serves as a benchmark resource for researchers and industry professionals, offering critical insights into trends, challenges, and innovations in achieving optimal sealing performance for EV battery systems.]]></description>
      <pubDate>Wed, 10 Jun 2026 17:05:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2712080</guid>
    </item>
    <item>
      <title>A Vehicle-Integrated Validation Method for Weather-Strip Sealing Performance in Automotive Closure Systems</title>
      <link>https://trid.trb.org/View/2691955</link>
      <description><![CDATA[Weather-strip sealing systems are critical to automotive closure performance, influencing water- and dust-tightness, aerodynamic noise control, and overall NVH quality. Conventional validation often relies on flat or straight JIG-based tests that inadequately represent the curved, angled, and non-uniform geometries of real closures such as doors, tailgates, hoods, roofs, and fixed or movable glass. This disparity limits the predictive accuracy of sealing performance in actual vehicles.This study proposes a vehicle-integrated validation framework that mirrors true geometric and contact conditions. The methodology combines finite element analysis (FEA) of both flat JIG and full-vehicle CAD geometries with experimental JIG tests, establishing a baseline for pressure distribution, compression load, and sealing contact behavior. A comparative analysis highlights significant deviations between flat-section predictions and vehicle-specific closure profiles. Results demonstrate that the integrated method more accurately reflects sealing efficiency, sound transmission loss, and long-term deformation, offering improved reliability for early-stage NVH optimization and product qualification. The findings recommend incorporating vehicle-profile-based validation into standard development practice for automotive weather-strips.]]></description>
      <pubDate>Thu, 30 Apr 2026 16:39:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/2691955</guid>
    </item>
    <item>
      <title> CFD-Based Investigation of Fuel Tank Sloshing: Crash Safety and Noise Concerns</title>
      <link>https://trid.trb.org/View/2692131</link>
      <description><![CDATA[A computational study using the Volume of Fluid (VOF) method in SimericsMP+ was conducted to investigate fuel sloshing in automotive fuel tanks under both crash and sudden stop conditions. The SEALs method was employed to rapidly generate the fuel tank mesh, enabling efficient simulation setup. At the outset, a benchmark sloshing case was simulated and compared against experimental data, showing excellent agreement to validate the simulation method. This simulation method was then applied to the fuel tank sloshing scenarios mimicking crash and sudden stop conditions. The study initially focused on a crash scenario in which fuel waves impact valves, pumps, and other internal structures. Capturing these localized impact forces is critical for evaluating the risk of component failure and potential leakage. A baffle-equipped tank was simulated and compared with sensor data. Results show that the computed shock forces on valves and baffles closely matched the measurements, demonstrating the high accuracy of the CFD method in predicting crash safety performance and confirming the effectiveness of baffles in reducing fuel wave impacts. The validated framework was then applied to four new unbaffled tank designs to assess NVH performance during low-speed sudden stop maneuvers. Pressure fluctuations on tank walls, which are directly linked to cabin noise, were analyzed and compared against reference pressure measurements from physical tests to ensure compliance with NVH standards. Simulations revealed significant pressure peaks in certain designs, indicating sub-optimal acoustic performance and highlighting how the absence of internal columns or baffles amplifies wave propagation and surface loading. The computational strategy presented in this study provides a powerful tool for evaluating both crash safety and NVH behavior early in the design process. By delivering accurate predictions before physical prototypes are built, it helps guide fuel tank design development, reduces reliance on costly testing, and minimizes the risk of late-stage design failures.]]></description>
      <pubDate>Tue, 14 Apr 2026 15:11:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/2692131</guid>
    </item>
    <item>
      <title>Power Loss Evaluation in 4WD Axle &amp; Correlation with Testing Results</title>
      <link>https://trid.trb.org/View/2663570</link>
      <description><![CDATA[In tractors, efficiency is predominantly influenced by the transmission system, with transmission elements being the major contributors to power losses. Enhancing efficiency necessitates monitoring these power loss areas. Transmission power loss refers to the reduction in power from the engine to the final drive elements. Various parameters and factors affect these losses, and analyzing these conditions helps identify and improve the components that contribute most to driveline efficiency. This study correlates analytically calculated power loss with losses measured during testing under different load conditions. Additionally, critical parameters contributing to power loss in gears, bearings & in seals have been identified, and theoretical relationships have been established.]]></description>
      <pubDate>Mon, 02 Feb 2026 16:36:57 GMT</pubDate>
      <guid>https://trid.trb.org/View/2663570</guid>
    </item>
    <item>
      <title>Analysis of Door Seal Compression and its Influence on NVH Performance in Heavy-Duty Vehicle</title>
      <link>https://trid.trb.org/View/2663524</link>
      <description><![CDATA[This study focuses on the effect of door seal compression prediction and its impact on structure borne NVH in trucks. Customer perception of vibrations are envisaged as quality criteria. It is necessary to determine the contribution of seal stiffness due to seal compression under closed condition of the door rather than considering stiffness of the door seal under uncompressed conditions. The dynamic stiffness of door seal is determined from analysis of non-linear type. The simulations are built using the Mooney - Rivlin model. The parameters influencing the compression of door seals in both two – dimension and three – dimension, are identified from the analysis. This involves contemplating the appropriate seal mounted boundary condition on the body and the door of the vehicle. The stiffness after compression of seal is extracted from this non-linear analysis which is further used to obtain the vibration modes for the doors in the truck cabin. As a part of next step, the compressed seal stiffness value is used to analyze the operational vibration and structure borne cabin noise. The simulated results for modal performance including the effects of seal are validated with the experimental test data and are noticed to be in good agreement. The simulated result of models that were analyzed with the use of both uncompressed seal data and compressed seal data are compared for operational vibration, operational noise respectively. It is observed that the compressed seal stiffness has an impact on the structure borne NVH performance of the truck cabin.]]></description>
      <pubDate>Mon, 02 Feb 2026 16:36:56 GMT</pubDate>
      <guid>https://trid.trb.org/View/2663524</guid>
    </item>
    <item>
      <title>Reliability of Rubber Grommets by Stochastic Analysis of Geometric Tolerances</title>
      <link>https://trid.trb.org/View/2663478</link>
      <description><![CDATA[Manufacturing tolerances play a critical role in the quality and functionality of components, particularly those made from rubber. Even slight deviations in dimensions can cause significant issues such as improper fit and reduced performance, leading to increased costs and project delays. This is especially true for rubber grommets, which are nonlinear elastic components commonly used as sealants, gaskets, and insulation covers in automotive and industrial applications. Typically manufactured from EPDM rubber with varying Shore hardness, grommets must maintain precise geometry to ensure sealing integrity and protect adjacent parts. Dimensional inaccuracies can result in failures such as buckling or misalignment, compromising both functionality and durability.This study proposes a digital simulation methodology for early-stage evaluation of grommet robustness, reducing reliance on physical prototypes. Using a stochastic design of experiments (DOE) approach, the influence of critical geometric parameters on grommet performance is assessed under variable manufacturing conditions.Buckling, identified as the primary failure mode, along with other functional metrics, is analyzed across a spectrum of dimensional tolerances. These insights support more efficient design workflows and enhance the robustness of rubber grommets in real-world applications.]]></description>
      <pubDate>Mon, 02 Feb 2026 16:36:56 GMT</pubDate>
      <guid>https://trid.trb.org/View/2663478</guid>
    </item>
    <item>
      <title>Structural Analysis and Design Optimization of Cylinder Head of Cummins Light Duty Engine for Medium Wheelbase (MWB) Pick-Up Truck</title>
      <link>https://trid.trb.org/View/2663472</link>
      <description><![CDATA[This paper presents the design, structural analysis, structural test validation and risk assessment done by Cummins to evaluate the structural integrity of Light Duty engine cylinder head for a Medium Wheelbase (MWB) pick-up truck. Initially, Cummins used the 2.5L and 3.0L (4-cylinder) engines that have standard power ratings based on existing requirements, but rising market demands for more power, fuel efficiency, lower cost and weight, and future emission compliance led to customer requirements for 15% uprate for 2.5L and 22% uprate for 3.0L from the same base engine. The increase in power requirement possesses challenges on critical components, especially cylinder heads in terms of thermal and structural limits.Multiple analysis led design iterations were performed using cutting edge CAE software such as Ansys, Dassault Systems fe-safe, and PTC Creo to ensure the structural integrity of the cylinder head under high thermal and mechanical loads, and to keep design margins within acceptable limits. A key feature identified through topology optimization was diagonal ribbing pattern on each cylinder, which is novel, and similar pattern can be applied to both new and existing engine platforms to enhance stiffness without major changes to the water jacket.The Cylinder head was subjected to a long endurance test, which comprises of high thermal and mechanical loads under extreme operating conditions. After running for specified number of hours as per inhouse test requirements, the engine was stopped for magnetic particle inspection for any signs of fatigue failure.No major cracks were observed on the 3.0L Cylinder head combustion face. However, a few cracks were observed on the 2.5L cylinder head combustion face at exhaust & intake bridges. Upon investigation, it was concluded that crack was due to high thermo-mechanical fatigue loads and hence further optimization was carried out on the cylinder head design. Furthermore, cylinder head gasket coolant orifice optimization is done to improve the coolant distribution to each cylinder. Thermal analysis showed a reduction in exhaust & intake bridge temperature within the acceptable limits. This paper captures the detailed design and structural analysis on 3.0L and 2.5 L diesel engine Cylinder head.]]></description>
      <pubDate>Mon, 02 Feb 2026 16:36:56 GMT</pubDate>
      <guid>https://trid.trb.org/View/2663472</guid>
    </item>
    <item>
      <title>Advancement in Analytical Characterization of NBR: Py-GC-MS as an Alternative to NMR for Acrylonitrile Quantification</title>
      <link>https://trid.trb.org/View/2663449</link>
      <description><![CDATA[Nitrile Butadiene Rubber (NBR), known for its superior resistance to hydrocarbon oil, low gas permeability, and excellent thermal stability, finds extensive use in seals, O-rings, conveyor belts etc. Importantly, these performance attributes are chiefly governed by acrylonitrile content in NBR. Analytical characterization of raw NBR is relatively straightforward using conventional techniques such as elemental analysis (CHNS) and liquid state 13C NMR. In contrast, the analysis of vulcanized NBR presents considerable challenges due to its crosslinked structure, which renders it insoluble in most organic and inorganic solvents, thereby restricting direct molecular-level analysis. While solid-state 13C NMR is an established technique for structural characterization in rubber vulcanizates, its high-cost curbs routine industrial analysis. In this study, Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC-MS) technique has been explored as a robust, precise, cost-effective alternative.Quantitative determination of acrylonitrile (ACN) content in vulcanized NBR, covering a compositional range of 15% to 52% is carried out using Py-GC-MS. For sequence distribution of ACN units, liquid-state 13C NMR, is utilized exclusively for soluble, uncured NBR. The absolute ACN content values thus obtained serve as reference standards for validating the Py-GC-MS method, enabling robust quantification across both raw and cured material forms.]]></description>
      <pubDate>Mon, 02 Feb 2026 16:36:56 GMT</pubDate>
      <guid>https://trid.trb.org/View/2663449</guid>
    </item>
    <item>
      <title>Rear Wiper Motor with Nozzle Integration</title>
      <link>https://trid.trb.org/View/2663416</link>
      <description><![CDATA[In today's dynamic driving environments, reliable rear wiping functionality is essential for maintaining safe rearward visibility. This study sharing the next-generation rear wiper motor assembly that seamlessly integrates the washer nozzle, delivering improved performance alongside key benefits such as better Buzz, Squeak, and Rattle (BSR) characteristics, reduced system complexity, cost savings, and enhanced perceived quality. This integrated design simplifies the hose routing which improves the compactness and the efficiency of the design. This also enhances the spray coverage and minimizes the dry wiping unlike the traditional systems that position the washer nozzle separately.A non-return valve (NRV) is incorporated to eliminate spray delays ass it maintains consistent water flow giving cleaning effectiveness. Since this makes the nonfunctional parts completely leak proof due to the advanced sealing, it increases the durability and reliability in long run. As this proposal offers a sustainable solution, it can be considered as the new benchmark in rear wiper technology.]]></description>
      <pubDate>Mon, 02 Feb 2026 16:36:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/2663416</guid>
    </item>
    <item>
      <title>The Technological Concept of a Self-Adjusting Segmented Ceramic
                    Sealing System for a Turboshaft Engine with Isochoric Combustion</title>
      <link>https://trid.trb.org/View/2656985</link>
      <description><![CDATA[
                
                The article presents self-adjusting segmented ceramic seals designed for a novel
                    turboshaft engine operating according to the Humphrey thermodynamic cycle. The
                    sealing system is an integral part of the developed engine concept, which
                    features rotating isochoric combustion chambers. The seals utilize centrifugal
                    force as the sealing force, enabling uniform sealing regardless of thermal
                    conditions and associated deformations. The sealing consists of segments with
                    adjustable dimensions in both circumferential and transverse directions. The
                    sealing elements should be made of Si3N4 ceramic,
                    characterized by high thermal resistance (1300°C) and low thermal expansion
                        (3.2•10-6/°C). The article presents three different variants of
                    sealing systems, differing in terms of the technological possibilities of their
                    manufacturing. Special treatments must be applied to ensure high machining
                    accuracy of the sealing elements. The proposed sealing system is a critical
                    point in the design of an engine with isochoric combustion chambers. Successful
                    sealing is key to the implementation of the Humphreys thermodynamic cycle, which
                    offers higher engine efficiency compared to classical turboshaft engines
                    available on the market. The article concludes with the presentation of a model
                    for experimental investigations, along with its thermal analysis.
            ]]></description>
      <pubDate>Fri, 23 Jan 2026 16:42:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2656985</guid>
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