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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" />
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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>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>Design and Analysis of a Lightweight Offshore Gangway</title>
      <link>https://trid.trb.org/View/2742647</link>
      <description><![CDATA[During offshore wind power operation and maintenance activities, personnel transfer and boarding procedures involve numerous safety risks. is a highly effective solution for enhancing safety during ship transfers at sea. This paper designs a compact active motion-compensating lightweight gangway capable of compensating for multi-degree-of-freedom motions induced by sea waves, including roll, pitch, yaw, and heave. The structural design is first established, and based on this configuration, the output forces of the rotary electric cylinder, roll electric cylinder, and pitch electric cylinder are analyzed. A finite element method was employed to conduct a static analysis of the gangway under extreme loading conditions. Analysis of the first six modal orders revealed that the first natural frequency of the designed gangway is significantly higher than the wave frequency, thereby effectively preventing resonance phenomena. The forward transformation matrix of the gangway was simulated using the Denavit-Hartenberg (DH) method. Simulation results indicate that the working space of the lightweight gangway meets the preset motion range requirements, thereby validating the design’s feasibility. The designed compact passageway features simple operational control, high cost-effectiveness, minimal installation footprint, and low installation and control complexity, demonstrating high practicality.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:42:12 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742647</guid>
    </item>
    <item>
      <title>Design and Analysis of Offshore Wind Power Operation and Maintenance Shipborne Pitch Compensation Trestle Structure</title>
      <link>https://trid.trb.org/View/2742618</link>
      <description><![CDATA[In light of the significant roll/pitch experienced by traditional shipboard trestles due to wave action during the transfer of maintenance personnel from the operation and maintenance vessel to the offshore wind turbine base, an analysis of ship motion states was conducted under various sea conditions and ship manufacturing parameters. The kinematic capabilities and characteristics of the actuator were defined, and the mapping relationship between the wave compensation capability of the active wave compensation trestle and key design parameters, such as actuator power, was established. Consequently, an active wave compensation trestle executive mechanism was developed, incorporating lightweight research into its design. A prototype of the active wave compensation trestle was constructed and subjected to motion compensation testing. The results indicate that the prototype can effectively maintain stability between the ship and the offshore facility, thereby enhancing the safety of transferring personnel and improving maintenance efficiency.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:42:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742618</guid>
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    <item>
      <title>Desulfurization and Acid Resistance of Multifunctional Protective Coatings in Severe Environment</title>
      <link>https://trid.trb.org/View/2742616</link>
      <description><![CDATA[Desulfurization equipment in electric power industry is in a multi-field coupled corrosion environment with high temperature, high humidity, strong acid and solid-containing slurry. The annual direct economic loss of corrosion exceeds 5 billion yuan, and the equipment replacement cycle is only 1.5-2 years. Traditional protective coatings are difficult to meet the needs. The concept of “bionic barrier-intelligent response-in-situ purification” is proposed to construct multifunctional protective coatings: The Langmuir-Blodgett technique was used to alternately assemble MXene nanosheets and polysilazane. Ti-O-Si covalent bonds enhanced the interface bonding, resulting in a coating hardness of 4H and an elongation of 200%. After 1500 hours of extreme environment test, the coating has low weight loss rate, high self-repair and antibacterial rate, and its service life is extended by 8 times. The engineering application makes the maintenance period of desulfurization tower of a 660MW unit extended from 8 months to 6 years, saving 1.2 million yuan annually, and increasing 200,000 yuan annually by recovering H ˇ SO 2. It provides a cross-scale scheme for electric power corrosion protection.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:53 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742616</guid>
    </item>
    <item>
      <title>Research on Data-Driven Intelligent Monitoring and Prediction System for Fatigue Damage in Metallurgical Cranes</title>
      <link>https://trid.trb.org/View/2742583</link>
      <description><![CDATA[Metallurgical cranes have a high risk of structural fatigue damage and failure under complex working conditions such as high temperature, heavy load, and strong electromagnetic interference. This article proposes a data-driven structural fatigue damage health monitoring system. This system integrates fiber Bragg grating sensing technology, rigid flexible coupling multi-body dynamics simulation, and big data analysis methods to construct a sensor optimization layout strategy based on rigid flexible coupling virtual prototype simulation, achieving real-time perception of stress states in key parts such as the mid span and end beam corners of the main beam. Develop a visualization system that integrates health monitoring, damage diagnosis, and life prediction. This system can dynamically evaluate the structural health status of metallurgical cranes and predict the remaining life of the structure based on a nonlinear cumulative damage model. On site engineering applications have shown that the monitoring and prediction visualization system can effectively improve the intelligent and safe operation and maintenance level of metallurgical cranes, providing a data foundation and possibility for their predictive maintenance.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742583</guid>
    </item>
    <item>
      <title>Advancing Reliability Centered Maintenance: A Robust Statistical Approach for MTBF Estimation in Aero-Engine Fleets via Subgrouping Strategy and Dual Weibull Modeling</title>
      <link>https://trid.trb.org/View/2742568</link>
      <description><![CDATA[Fleet heterogeneity, from manufacturing variations and diverse operating conditions, complicates reliability analysis by obscuring true failure patterns in aero-engines. This is a critical challenge in an industry as inaccurate Mean Time Between Failures (MTBF) estimates threaten safety and inflate operational costs, by forcing a choice between inefficiently conservative maintenance or the risk of in-service failures. Conventional analysis often fails by pooling all fleet data. To address this, our paper presents an analytical framework that improves predictive accuracy by filtering, rather than aggregating statistical noise. The methodology uses a Randomized Block Design (RBD) and ANOVA hypothesis test to screen a diverse dataset and isolate statistically homogeneous subgroups. This filtration identifies a core fleet with a consistent failure signature, providing a purified dataset for modeling. This refined data is then modeled using both Weibull and the Exponentiated Inverse Weibull distributions to ensure the results are robust and not model-dependent.Applying this framework to a 25-engine dataset that experienced 66 failures, we isolated a stable failure pattern, yielding a primary MTBF of 171.16 hours and a cross-validated MTBF of 176.35 hours. The close 3% convergence between these models validates our approach. By providing a dependable MTBF, this work establishes a stronger foundation for data-driven Reliability Centered Maintenance (RCM). It empowers maintenance planners to move toward evidence-based intervals, safely extending engine time-on-wing, optimizing spare parts inventory, and significantly reducing direct operational costs for airlines.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742568</guid>
    </item>
    <item>
      <title>Development and Performance Validation of a Maintenance Platform for 10kV Switchgear Trolleys</title>
      <link>https://trid.trb.org/View/2742567</link>
      <description><![CDATA[With the development of the power industry, 10kV switchgear (circuit breaker switches) are increasingly widely applied in power grids. When performing power-off maintenance or testing on 10kV switchgear (circuit breaker switches) at substations, maintenance personnel require transport carts to move the equipment to suitable locations for operation. Traditional transfer carts suffer from structural design flaws and significant shortcomings. These include difficulty operating in the confined spaces of switchgear cabinets, high risks associated with manual handling, low efficiency in secondary transfers, and poor adaptability across multiple workstations. These issues collectively pose safety hazards during power-off maintenance or testing. When operating in a 3m×5m high-voltage room, traditional maintenance carts achieve less than 0.5 units transported per hour, with equipment damage rates reaching 3% annually due to drops, resulting in low work efficiency. To address these challenges, a 10kV switch cart maintenance platform has been developed. This standardized equipment facilitates 10kV switch cart maintenance, supporting the intelligent upgrade of power grid operation and maintenance.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742567</guid>
    </item>
    <item>
      <title>Design and Analysis of a Large Hydraulic Cylinder Maintenance Device</title>
      <link>https://trid.trb.org/View/2742563</link>
      <description><![CDATA[Addressing the challenges in maintaining large hydraulic cylinders and the lack of specialized equipment, this study presents a dedicated maintenance system developed through a case study of a large hydraulic lifting cylinder. Through a comprehensive analysis of maintenance requirements, we developed a six-component maintenance system comprising a foundation base, a mounting bracket, a cylinder support frame, a piston rod bracket, a drive cylinder bracket, and hydraulic components. The paper systematically explains the structural configurations and functional specifications of each component, details the operational workflow of the maintenance system, and conducts theoretical design and strength verification for critical load-bearing brackets using principles from theoretical mechanics and structural mechanics. A static analysis module from ANSYS Workbench finite element software was employed to validate the overall structure. Results demonstrate that the key components meet operational strength requirements. This innovative maintenance system proves highly feasible and serves as a valuable reference for designing similar hydraulic cylinder systems.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742563</guid>
    </item>
    <item>
      <title>Design and Control of a Target Plate Fastener Assembly and Disassembly Actuator for Divertor Maintenance in Fusion Reactors</title>
      <link>https://trid.trb.org/View/2742555</link>
      <description><![CDATA[With the development of controlled nuclear fusion technology, the tokamak device, as the most promising magnetic confinement fusion reactor for advanced engineering applications, requires remote maintenance of its internal components, which has become a key factor affecting both operational efficiency and safety. As a critical component directly exposed to high-temperature plasma, the divertor target plate needs to be periodically replaced and carefully maintained to ensure stable and reliable reactor operation. However, this region is subject to extreme conditions, including high temperature, high vacuum, and intense radiation, making conventional manual maintenance infeasible. This necessitates the development of intelligent and automated teleoperation systems. To address the automated assembly and disassembly requirements of divertor target plates, this study designs an integrated target plate actuator comprising key functional units: a positioning module, a screwing module, a quick-change module, and a passive compliance structure. The actuator achieves rapid and precise alignment with target plate holes, accommodates bolts of different specifications, and exhibits excellent impact resistance. Furthermore, stiffness and mechanical analyses, supported by finite element simulations, verify the actuator’s safety and reliability under high loads and impact forces. To further enhance operational performance, a segmented disassembly and assembly control strategy based on reinforcement learning is proposed, enabling the actuator to adaptively handle torque variations and ensure precise and stable bolt operations. The results demonstrate that the proposed actuator and control strategy significantly improve the accuracy, stability, and efficiency of target plate operations under complex working conditions, providing a reliable solution for automated divertor maintenance in tokamak devices.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:36:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742555</guid>
    </item>
    <item>
      <title>Design and Application of Simulation-Based Lifting Tool for Fabric Truck Roller Replacement</title>
      <link>https://trid.trb.org/View/2742515</link>
      <description><![CDATA[In the process of replacing the rollers of the fabric cart of the tobacco storage cabinet, in order to solve the problems of low replacement efficiency and high safety risk.This article proposes a specialized lifting tool for fabric cart rollers with a self-locking and adopts the screw lifting structure, which facilitates roller maintenance operations, and conducts SolidWorks Simulation calculations and dynamic simulation methods. Jinan Cigarette Factory fine cigarettes special line leaf silk temporary storage cabinet fabric car roller replacement, for example, the results show that: the average operating personnel reduced by 50%, the replacement time from 6.7h to 1.2h, efficiency increased by 458%, This innovation significantly reduces the labor intensity of maintenance personnel and ensures a safe and reliable replacement process.]]></description>
      <pubDate>Mon, 03 Aug 2026 15:15:59 GMT</pubDate>
      <guid>https://trid.trb.org/View/2742515</guid>
    </item>
    <item>
      <title>Fractal-dimension-based metric for seismic resilience of urban rail networks: integrating real-world data and accounting for spatial service capacity</title>
      <link>https://trid.trb.org/View/2687097</link>
      <description><![CDATA[This study establishes a new seismic resilience assessment metric and method for urban rail transit networks (URTN) based on fractal dimension. It achieves a comprehensive simulation of the real world by embedding passenger flow information and physical characteristic component models into the topological network structure. In terms of the topological network structure, actual passenger flow data are integrated into a weighted network to construct the topological model. Fractal dimension theory is then used to quantitatively analyze its resilience. In terms of component models, the elliptical intensity attenuation model and the seismic fragility model are embedded to reflect the true physical characteristics of components in disaster scenarios. Finally, through a case study, the resilience triangle theory is used to calculate the changes in the resilience metric over time for the Shanghai URTN. A comparative analysis of two different repair strategies is also conducted. The results indicate that fractal dimension is a reasonable and effective metric for assessing the seismic resilience of URTN. The assessment method based on it provides a high-resolution depiction of URTN seismic resilience. The fundamental measure to reduce resilience loss is to increase investment in repair resources, while the auxiliary measure is to choose appropriate repair strategies.]]></description>
      <pubDate>Fri, 31 Jul 2026 09:23:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/2687097</guid>
    </item>
    <item>
      <title>Quantitative Determination for the Rejuvenator Content in Calcium Alginate Capsules for Self-Healing Asphalt</title>
      <link>https://trid.trb.org/View/2689382</link>
      <description><![CDATA[Calcium alginate capsules encapsulating bitumen rejuvenator represent an extrinsic asphalt self-healing system characterized by high encapsulation efficiency and the capability for multiple, time-dependent releases of rejuvenator. The core rejuvenator content within these capsules is a critical determinant of their self-healing performance. This study determined and compared the rejuvenator content in calcium alginate capsules using three analytical techniques: solvent extraction, thermogravimetric analysis (TGA), and X-ray computed tomography (X-CT). Capsules were fabricated with various rejuvenator types and shell compositions. The efficiency and accuracy of these methods were systematically evaluated, and an improved TGA-based protocol was developed to address systematic errors present in conventional approaches. Results indicated that both the type of rejuvenator and the shell material density significantly influence core content. The solvent extraction method measured rejuvenator contents of 52.24 % in oil capsules, 27.34 % in aromatic rejuvenator capsules, and 47.61 % in oil capsules with nano-Fe₃O₄. The improved TGA method demonstrated superior accuracy and minimal error, whereas the X-CT method showed substantial discrepancies. Importantly, our findings establish that the improved TGA method is not only more user-friendly and less material-intensive than the extraction method, but also offers a more reliable and practical approach for quantitative assessment of capsule core content, outperforming the other techniques evaluated.]]></description>
      <pubDate>Fri, 31 Jul 2026 09:23:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2689382</guid>
    </item>
    <item>
      <title>Optimal Repair Time for Failure Units of Complex Natural Gas Pipeline Network System Based on Cost and System Supply Reliability</title>
      <link>https://trid.trb.org/View/2695136</link>
      <description><![CDATA[The repair time for failure unit is treated as a static parameter in researches on enhancing the supply security of natural gas pipeline network system, while its dynamic impact on system supply capacity is overlooked. To address this gap, a unit optimal repair time determination method based on cost and system supply reliability is proposed. The costs within unit repair time are analyzed. The total unit cost curve is analyzed. The characteristic of unit state transition is captured by Markov process, a unit reliability calculation model considering cumulative risk is proposed. The mapping relationship between unit repair time and system supply reliability is characterized. An optimization model is established with the objective of minimizing total system cost. Two system supply reliability constraint strategies and unit repair time constraints are proposed. A real pipeline network in China is employed as the application platform. Total system cost is minimized when the system supply reliability is 0.99899. The optimal repair time for compressor station units change significantly as target supply reliability increases, the optimal repair time for pipeline units change slightly. This study can reasonably allocate repair resources, providing theoretical and practical support for decision-makers to formulate scientific and efficient failure response plan.]]></description>
      <pubDate>Fri, 31 Jul 2026 09:23:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2695136</guid>
    </item>
    <item>
      <title>Molecular and rheological assessment of crude corn oil for restoring self-healing in recycled asphalt binders</title>
      <link>https://trid.trb.org/View/2693934</link>
      <description><![CDATA[The utilization of vegetable-based oils as asphalt modifiers has gained significant attention; however, the specific mechanisms by which crude corn oil (CO) enhances self-healing properties—particularly through integrated multi-scale analysis—remain underexplored. This study investigates CO as a sustainable recycling agent intended to restore the self-healing capability of aged asphalt binders. Specifically, it examines the effect of CO on the self-healing performance of a recycled binder (CR) composed of 65% reclaimed asphalt binder (R) blended with a base PG 64–28 binder, using both experimental testing and molecular dynamics (MD) simulations. The research employed simplified viscoelastic continuum damage theory (S-VECD) and pseudo strain energy (PSE) functions to assess damage tolerance, crack generation, and self-healing properties. Damage characteristic curve (DCC) analysis showed that CO had a positive effect on binder rheology, increasing the damage tolerance of the recycled binder and bringing its S-value (a scalar parameter representing material damage evolution) closer to that of the base binder. PSE results further confirmed that CO reduced microcrack formation in the recycled binder. MD simulations were used to evaluate the physical, thermal, and rheological binder properties, and used viscosity recovery (restoration of viscosity following microcrack formation) as a proxy for self-healing performance. The results indicated that CO restored viscosity, effectively rejuvenating the atomistic structure of the recycled binder. However, discrepancies between experimental self-healing (Hexp%) and simulation-based results (Hsim%) suggest that density recovery alone may not fully capture self-healing behavior when using the General AMBER force field (GAFF). Overall, this study highlights the complementary value of experimental and simulation approaches for evaluating the effectiveness of CO in enhancing the self-healing properties of recycled binders, offering potential benefits for asphalt pavement durability.]]></description>
      <pubDate>Fri, 24 Jul 2026 08:40:26 GMT</pubDate>
      <guid>https://trid.trb.org/View/2693934</guid>
    </item>
    <item>
      <title>Human Reliability in Aircraft Maintenance Operations: A Quantitative Analysis Through Evidential Reasoning-Enhanced SPAR-H Methodology</title>
      <link>https://trid.trb.org/View/2732265</link>
      <description><![CDATA[The reliability of aviation maintenance personnel directly impacts flight safety, yet systematic methodologies for the quantitative prediction of human error probability (HEP) in this domain remain lacking. To address this gap, a novel human factors reliability analysis method for aviation maintenance is proposed, extending the SPAR-H model through Evidential Reasoning (ER). This method is implemented as follows: Maintenance tasks are decomposed into subtasks. Subsequently, the eight types of Performance Shaping Factors (PSFs) for each subtask are evaluated by domain experts according to defined PSF levels. Expert judgments are then aggregated using Evidential Reasoning theory, enabling the calculation of aggregated PSF levels. These aggregated levels are interpolated to determine the corresponding impact multipliers. Finally, the HEP for aviation maintenance operations is calculated by integrating the SPAR-H basic error probability model with task series/parallel logic rules. The proposed methodology is validated using an inspection operation case study. This study establishes a methodological framework for human factors reliability analysis in aviation maintenance, providing a theoretical foundation for developing scientifically grounded prevention and control measures to enhance aviation safety levels.]]></description>
      <pubDate>Tue, 21 Jul 2026 11:36:51 GMT</pubDate>
      <guid>https://trid.trb.org/View/2732265</guid>
    </item>
    <item>
      <title>Design and Testing of a Quasi-Zero-Stiffness Vehicle-Mounted Isolation System with Additional Inerter</title>
      <link>https://trid.trb.org/View/2732210</link>
      <description><![CDATA[Vehicle vibrations during precision instrument transport can cause damage and failure. Existing vibration isolators often lack reliability, mass production feasibility, and easy maintenance. In this paper, we design and analyze a quasi-zero-stiffness vehicle-mounted isolator with an inerter, decreasing dynamic stiffness while raising the effective mass. Theoretical, simulation, and experimental results show improved isolation performance, lower isolation frequency, and a broader isolation bandwidth.]]></description>
      <pubDate>Tue, 21 Jul 2026 11:36:51 GMT</pubDate>
      <guid>https://trid.trb.org/View/2732210</guid>
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