<rss version="2.0" xmlns:atom="https://www.w3.org/2005/Atom">
  <channel>
    <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>A novel portable integrated hybrid active–passive heave compensator for offshore lifting operations: Design, simulation and validation</title>
      <link>https://trid.trb.org/View/2710038</link>
      <description><![CDATA[Offshore lifting operations are highly sensitive to vessel heave motion and the heave compensation system is essential for ensuring operational safety and extending the weather window. A novel portable integrated hybrid active–passive heave compensator (PI-HAHC) is developed, which adopts the dual-piston accumulator to combine the passive and active heave compensation system. The simplified dynamic model of PI-HAHC is given and a numerical model based on the AMESim platform is established. The mechanical parameters of the device are optimized based on the particle swarm optimization algorithm and the numerical simulations are performed to evaluate the performance under different sea states. Different control strategies are implemented to investigate the effect of active heave compensation. The experimental tests are conducted to validate the dynamic performance and compensation efficiency of the proposed PI-HAHC system, with heave compensation efficiency reaching up to 98.38% in the prototype experiments.]]></description>
      <pubDate>Wed, 10 Jun 2026 16:38:52 GMT</pubDate>
      <guid>https://trid.trb.org/View/2710038</guid>
    </item>
    <item>
      <title>Research on double pendulum anti-swing of cable-driven multi-point collaborative lifting for shipboard boom crane based on tension optimization</title>
      <link>https://trid.trb.org/View/2625528</link>
      <description><![CDATA[The variable and unpredictable marine environment will not only inevitably cause the double pendulum phenomenon of shipboard boom crane lifting system, but also directly threaten the safe and efficient lifting operation. In this paper, in view of the above problems, firstly, the mathematical model of ocean random wind is established, and the mathematical model of wave is established by using the Pierson-Moskowitz (PM) method, so as to obtain an environmental disturbance model of the shipboard boom crane in this way. Then, the Lagrange equation is used to establish the dynamic equation of the double pendulum for the multi-point collaborative lifting of shipboard boom crane under the influence of roll, pitch, and environmental disturbance. After that, a fractional-order PID (FOPID) constant tension optimization control (CTOC) method based on the particle swarm optimization (PSO) algorithm is proposed, which is used to optimize the anti-swing cable tension. At the same time, a nonlinear hierarchical sliding mode controller (HSMC) with CTOC is designed, and the stability of the HSMC with CTOC is proved by the Lyapunov stability theorem and Barbalat’s lemma. Finally, the experimental results show that the FOPID can reduce the tension fluctuation range of the anti-swing cables by more than 63.5%, and the HSMC with CTOC method can reduce the out-of-plane angle swing of the hook and payload by more than 85.5% and 87.3%, respectively, as well as the in-plane angle swing by more than 80.9% and 91.8%, respectively.]]></description>
      <pubDate>Mon, 27 Apr 2026 14:59:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2625528</guid>
    </item>
    <item>
      <title>Recovery of potential energy in the lifting system of a battery electric catering lift truck</title>
      <link>https://trid.trb.org/View/2652093</link>
      <description><![CDATA[Following the principle of energy conservation, this investigation aims to reduce consumption and enhance the energy efficiency of the lifting system of a battery electric catering lift truck through the recovery of potential energy. During operation, the truck elevates the catering container to the door height of the aircraft being serviced. When the container is lowered, its potential gravitational energy is released as heat, thus becoming unavailable to the system. The feasibility of recovering this energy is analysed in two different configurations of the lifting system; the first represents the current system consisting of a hydraulic circuit driven by the truck's main electric motor, while an alternative configuration suggests the use of a mechanical helical band actuator in place of the hydraulic circuit, powered by its own electric motor. Using Matlab/Simulink, both system configurations are simulated and evaluated for energy efficiency and energy saving for various load speeds and weights.]]></description>
      <pubDate>Thu, 26 Feb 2026 17:01:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/2652093</guid>
    </item>
    <item>
      <title>What drives the effective integration of lift assists in automotive assembly? Perspectives from operators, ergonomists, and manufacturers</title>
      <link>https://trid.trb.org/View/2640992</link>
      <description><![CDATA[Automotive assembly workers experience elevated risks of work-related musculoskeletal disorders due to frequent material handling. Lift assists (LAs) can reduce these risks by offsetting payload weights. However, integrating LAs into complex workflows can be challenging, and workers may choose not to use LAs to achieve other objectives. We interviewed 16 operators, nine ergonomists, and six LA manufacturers to capture diverse viewpoints. Content analysis revealed perspectives on LA usability, design, implementation, and operational concerns. Operators noted physical demands in initiating, turning, or stopping LAs, and emphasized lightweight designs, simplified controls, and structured training. Ergonomists reported retrofitting LAs into workflows not designed for LAs, creating integration challenges. LA manufacturers described balancing ergonomic goals with operational demands and evolving requirements, emphasizing the need for better design feedback. Our findings suggest that heavy equipment, complex controls, and limited training hinder successful LA implementation; we offer recommendations to improve future LA design and implementation.]]></description>
      <pubDate>Tue, 17 Feb 2026 13:12:50 GMT</pubDate>
      <guid>https://trid.trb.org/View/2640992</guid>
    </item>
    <item>
      <title>Research on active suspension-based anti-rollover control strategy for side-unloading dump trucks during lifting operations</title>
      <link>https://trid.trb.org/View/2573106</link>
      <description><![CDATA[Aiming at the problem of poor stability of side-unloading dump trucks under lifting conditions, an anti-rollover control strategy combining active suspension and fuzzy sliding mode control (SMC) is proposed. Considering the changes in the mass and spatial position of the cargo during lateral unloading, a four-degree-of-freedom side-unloading dump truck nonlinear model was established, and the model's accuracy was validated using MATLAB/Simulink. The adjustment of SMC parameters was realized through fuzzy logic, and the fuzzy-sliding mode controller (FSMC) was used to obtain the anti-roll moment that suppresses suspension deformation. A rollover warning controller was designed using the ratio of the right wheel load to the total vehicle weight as the rollover evaluation index. Simulation was conducted using ordinary SMC and without any control for comparison. The results indicate that this strategy enhances the lateral stability of side-unloading dump trucks under lifting operations, effectively preventing rollover incidents.]]></description>
      <pubDate>Wed, 19 Nov 2025 17:09:40 GMT</pubDate>
      <guid>https://trid.trb.org/View/2573106</guid>
    </item>
    <item>
      <title>Investigation of the optimised control strategy of the loader boom lifting system</title>
      <link>https://trid.trb.org/View/2582202</link>
      <description><![CDATA[This paper studied the optimized control strategy to solve the problems of delayed start and end impact of loader boom lifting. Based on the analysis of the basic principle of the boom lifting system, a simulation model of the hydraulic coupling system was established using AMEsim. An optimized control strategy was proposed by analyzing the working characteristics, and a comparative analysis was conducted between the control strategies before and after optimization. The simulation results showed that the proposed optimized control strategy can reduce the delay time of loader lifting startup by 43.32% and improve the stability of startup by 32.6%, respectively, compared to the original strategy. Meanwhile, it was not affected by changes in oil temperature and working device load. Otherwise, automatic buffering of the boom at the lifting end was achieved, which improved the automation level of the loader.]]></description>
      <pubDate>Fri, 24 Oct 2025 14:25:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582202</guid>
    </item>
    <item>
      <title>Analysis of occupational accidents on board fishing vessels – What scope of regulations to prevent accidents involving deck machinery?</title>
      <link>https://trid.trb.org/View/2578410</link>
      <description><![CDATA[Sea fishing is one of the most dangerous occupations and various studies show that deck machinery is often involved in the most serious accidents. In terms of health and safety, European and French regulations provide design requirements for these devices and for the layout of workstations on board fishing vessels. The aim of this article is to analyze accidents involving hauling and hoisting gear on board French fishing vessels between 2016 and 2023 and to examine the impact of the regulations that aim to prevent them. To this end, mixed methods research was carried out. It combines quantitative and qualitative analyses. The quantitative analysis is based on a statistical approach (Chi2 calculations) of data contained in forms describing the circumstances of the accidents. To better understand the causal factors of these accidents, a qualitative method of three accidents was undertaken, using the causal tree method (CTM). The quantitative analysis shows that out of 5649 accidents, 262 were caused by hauling or hoisting gear. There is a highly significant relationship between the involvement of this element and the severity of the accident, the accidental process and the operation performed. The qualitative analysis highlights the role of organizational and especially technical factors related to the design of fishing vessels and gear. For both levels of analysis, results highlight the limited impact of regulations in terms of both enforcement and effectiveness. They also question the ability of regulations to be a resource for prevention and lead to proposals for different courses of action.]]></description>
      <pubDate>Tue, 19 Aug 2025 15:29:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/2578410</guid>
    </item>
    <item>
      <title>Research on dynamic modeling and control strategy of four anti-swing cable system for ship-mounted cranes</title>
      <link>https://trid.trb.org/View/2550961</link>
      <description><![CDATA[Ship-mounted cranes are becoming increasingly essential to modern ocean shipping. However, due to the continuous influence of waves, currents, and winds, achieving accurate and fast lifting is difficult because of the large payload swing during the lifting operation. Therefore, this study proposes a Four Anti-swing Cable System (FASCS) for ship-mounted cranes. Firstly, a dynamic model of the FASCS was established by using Robotics and Newton method, and a tension control method (TCM) is designed to reduce the swing angle of the payload. Concurrently, a sliding mode variable structure controller with improved reaching law (SMVSC-IRL) is designed to control the cooperative movement of the anti-swing cables and prevent the occurrence of snap. The dynamic characteristic analysis by MATLAB/Simulink shows that the swing angle suppression effect reaches 89.3% on average, and the projected area of the payload trajectory was reduced by 60%, which can significantly improve the efficiency of ship-mounted cranes lifting operations. In addition, the length and speed of cables in errors can approach 0 within 7 s, and the strong robustness of the designed SMVSC to control the cooperative motion of the anti-swing cables is proved. The results of this study contribute to the in-depth optimization and engineering verification of the FASCS for ship-mounted cranes.]]></description>
      <pubDate>Thu, 26 Jun 2025 16:12:29 GMT</pubDate>
      <guid>https://trid.trb.org/View/2550961</guid>
    </item>
    <item>
      <title>BAE Systems Jacksonville Ship Repair—Shiplift Dry-Docking Complex</title>
      <link>https://trid.trb.org/View/2559521</link>
      <description><![CDATA[Currently, under final construction, the BAE Systems (BAE) Jacksonville Ship Repair (BAEJSR) is poised to revolutionize ship docking in Florida and globally with its groundbreaking ship lift system, one of the world’s largest, boasting a remarkable lifting capacity. Amidst an ambitious expansion initiative totaling over $200 million, BAE’s latest endeavor involves the establishment of a state-of-the-art vertical ship lift and dry-docking complex. This cutting-edge infrastructure enhancement aims to bolster the industrial capacity vital for national security and the sustained growth of the US and international maritime sectors.]]></description>
      <pubDate>Tue, 24 Jun 2025 15:24:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/2559521</guid>
    </item>
    <item>
      <title>Selection of the Kinematic Scheme of the Rotation Mechanism of the Spreader Gripping Frame</title>
      <link>https://trid.trb.org/View/2408089</link>
      <description><![CDATA[Statistical data indicate a dynamic growth of container cargo transportation in the world cargo turnover, both in percentage and in absolute terms. The expansion of the container transportation industry is ensured, including the development of warehouse lifting equipment and cargo processing technologies. Technical improvement of lifting machines and lifting devices contributes to the improvement of their technical and operational indicators, improves the quality of logistics services and, as a result, has a positive economic effect. The paper analyzes the kinematic schemes of mechanisms for turning platforms (frames) of lifting and transport and construction machines, which have become practically widespread to date. A comparative assessment of the presented schemes is given, aimed at finding the optimal scheme of the rotation mechanism of the gripping frame of the spreader. The design and principle of operation of a modern suspended spreader for processing large-capacity containers is considered. The specifics of the working conditions of the spreader as a suspended unit are determined, on the basis of which the initial requirements for the mechanism of rotation of its gripping frame are formulated. A promising direction of modernization of this mechanism with the use of an electromechanical drive and an innovative spiroid gear is substantiated. The essential technical and operational advantages of the spiroid cylindrical gear over the widespread worm gear are described, which determine the possibility and necessity of its wider practical distribution in the mechanisms of lifting machines and, in particular, in the mechanisms of spreaders for processing large-capacity containers.]]></description>
      <pubDate>Fri, 21 Mar 2025 16:02:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2408089</guid>
    </item>
    <item>
      <title>Comparative Analysis of Methods for Calculating the Load Capacity of a Metal Bridge Span</title>
      <link>https://trid.trb.org/View/2407746</link>
      <description><![CDATA[Goals. To analyze the comparison of methods for calculating the load capacity of metal span structures. Research methods. Metal span structures designed for loads at the beginning of the 20th century was used as a calculation model. The results of the study. Analysis of the comparison of the assessment of the load capacity of metal bridge spans according to regulatory documents and with the help of modern software. Calculations using the example of a single span structure, it is shown that, despite the proximity of the results, some elements are estimated by the calculated method with a significant revaluation. Conclusions. The analysis revealed that the importance of an accurate assessment of the load-lifting capacity is associated with the accuracy of the assessment of the probability of failure and, consequently, with the safety of train traffic.]]></description>
      <pubDate>Wed, 19 Mar 2025 10:12:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/2407746</guid>
    </item>
    <item>
      <title>Dynamic analysis of the Cable-Driven Anti-swing System for slender payload lifting in the offshore environment</title>
      <link>https://trid.trb.org/View/2449371</link>
      <description><![CDATA[The slender payload lifting is inefficient and comes with high risk in rough sea conditions. Thus it is not easy to achieve precise assembly. This paper presents a Cable-Driven Anti-swing System (CDAS) for slender payload lifting in the offshore environment. The CDAS for offshore slender payload lifting is simplified as a constrained double-pendulum system with moving base excitations. Further, the dynamic characteristics are simulated and analysed by Matlab/Simulink. The CDAS has a good vibration suppression effect on the first stage pendulum, and it has a specific vibration suppression effect on the second stage pendulum as well under setting conditions. The experimental results show that the simulation curve of the hook and the slender payload is consistent with the experimental results, which verifies the accuracy of the dynamic model. The research results of this paper can provide a theoretical basis for the anti-swing control of the double-pendulum system like slender payload.]]></description>
      <pubDate>Thu, 21 Nov 2024 09:28:03 GMT</pubDate>
      <guid>https://trid.trb.org/View/2449371</guid>
    </item>
    <item>
      <title>Structural Safety Assessment of Lift Apparatus on Jack-Up Barge for Eco-Friendly Offshore Installation</title>
      <link>https://trid.trb.org/View/1974337</link>
      <description><![CDATA[Jack-up barge, one of the representative special vessels for installation and maintenance of offshore structures such as offshore plants, offshore facilities, and offshore renewable energy systems, secures the work stability of barge using mechanical holding force developed from leg or spud which is mounted on seabed. Lifting apparatus for jacket-up barge is the key equipment to maintain the holding force as well as to mount and to move the spud on the seabed under an extreme marine environment. Typical lifting apparatus types for offshore installation and maintenance are known as hydraulic pin type and rack-pinion. Recently, a new type of structural design has been devised to improve the holding power of lifting apparatus. Design uncertainty can exist in case that the evaluation of structural performance of such new type of lifting apparatus is carried out only by standard design guidance such as classification rules. In this study, structural safety assessment was performed for a new concept multi-ball holding clamp type lifting apparatus with 900 ton class holding capacity which was developed to improve the holding power. The evaluation of the structural strength performance was carried out by using the loading conditions which combine the mechanical loads of the operating cylinders with design load conditions for the deck lifting device of the mobile offshore structure specified by the classification rule. A three-dimensional finite element analysis (FEA) model was generated, and the analysis results of the structural stress and deformation were compared to the allowable stresses recommended by the classification rule.]]></description>
      <pubDate>Fri, 23 Aug 2024 16:53:41 GMT</pubDate>
      <guid>https://trid.trb.org/View/1974337</guid>
    </item>
    <item>
      <title>Validation of a Novel Lifting-Line Method for Propeller Design and Analysis</title>
      <link>https://trid.trb.org/View/1974254</link>
      <description><![CDATA[A novel formulation of the lifting-line theory for marine propellers, based on adaptations from the wing lifting-line theory, is reviewed; the formulation is capable of simulating skewed and raked propellers and incorporates the influence of viscosity on thrust and torque through a nonlinear scheme that changes the location of the control points iteratively. Several convergence studies were previously conducted, assessing the different aspects of the numerical tool; the results indicated convergence for propellers of the Kaplan, KCA, and B-Troost series, which generally cannot be satisfactorily simulated by the classical lifting-line alone. However, no validation process was presented, meaning that the solutions obtained had not yet been shown to agree with experimental or numerical data. Thus, four validation cases are presented in this work, evidencing the advantages and limitations of the proposed model.]]></description>
      <pubDate>Mon, 20 May 2024 14:02:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/1974254</guid>
    </item>
    <item>
      <title>Mathematical modeling energy losses and dynamic loads during operation of the crane lifting mechanism</title>
      <link>https://trid.trb.org/View/2319217</link>
      <description><![CDATA[A mathematical model of an overhead crane has been developed to calculate energy losses and dynamic loads during the operation of the lifting mechanism. The mathematical model of the crane, which is presented in the form of a three-mass design scheme, takes into account all the main parameters of the electromechanical system "electric drive - metal structure – load". The reduced to the ropes force of the asynchronous electric motor of the load lifting mechanism is taken into account using non-linear speed-torque characteristics. Differential and integral equations in the mathematical model of the crane make it possible to calculate energy losses in an asynchronous motor during a transient process due to constant losses, variable losses in the stator and rotor. Using the developed multifunctional computer program (in the Delphi environment), it is possible to calculate with high accuracy the values and build dependencies of all components of energy losses, as well as displacements, velocities, and accelerations of reduced masses, loads in the crane steel structure and ropes when lifting loads in transient processes. Using the presented mathematical model, studies of energy losses in the electric drive of the lifting mechanism and dynamic loads in the steel structures and ropes of an overhead crane with a lifting capacity of 20 (t) and spans from 19.5 to 31.5 (m) were carried out. The article presents the results of studies of transient processes when lifting a load "with pickup". Three stages of lifting the load are considered: the choice of gaps in the mechanism of lifting the load and the sagging of the ropes with a stationary load; change in effort in the ropes from zero to a value equal to the gravity of the load; the movement of all three masses after the separation of the load from the base.]]></description>
      <pubDate>Fri, 05 Apr 2024 09:03:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/2319217</guid>
    </item>
  </channel>
</rss>