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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>Modal Identification of Aircraft Wing Coupled Heave-Pitch Modes Using Wavelet Packet Decomposition and Logarithmic Decrement</title>
      <link>https://trid.trb.org/View/1901742</link>
      <description><![CDATA[Low frequency bending mode (heave) and high frequency twisting mode (pitch) are the two typical modes of motion that exist in an aircraft wing. Coupling of these modes produce flutter effect, which can severely distort the wing without warning. To avoid such distortions, flutter speed must be identified accurately by using modal parameters, so that necessary decision could be taken. This paper focuses on using an effective method for the modal testing of an aircraft wing to estimate the modal parameters of coupled heave-pitch modes. The method includes Wavelet Packet Decomposition (WPD) to uncouple a complex signal, followed by Logarithmic Decrement Method to estimate the modal parameters. Simulation is done to validate the effectiveness of the method. Finally the method is applied on the 2-DOF model (NACA 0012 aerofoil wing model) under free vibration test to estimate coupled heave-pitch modal parameters.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901742</guid>
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    <item>
      <title>Time Domain Flutter Speed Analysis of Cable Stayed Bridge</title>
      <link>https://trid.trb.org/View/1901701</link>
      <description><![CDATA[Modelling of cable stayed bridges subjected to wind loading is considered in this paper. A geometrically nonlinear static analysis is performed, based on which cable pretensions and system mass and stiffness matrices are obtained. The extended Scanlan-Tomko relations that include vertical, torsional, and lateral degrees of freedom are considered for the self-excited forces. The rational function approach is used for obtaining flutter derivatives from available experimental data. A time domain approach is adopted, which yields modified mass, stiffness and damping modal matrices and also augmented (aerodynamic) states. The modal state-space equations are thus obtained, and the eigenvalue problem solved to find the flutter speed and mode.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901701</guid>
    </item>
    <item>
      <title>Dealing with Noise and Vibration in Automotive Industry</title>
      <link>https://trid.trb.org/View/1901671</link>
      <description><![CDATA[The present day automotive industry looks for every option to attract the customers with products which will be generating lower noise, consume lesser fuel but also be equally powerful. This unique requirement drives the motivation for building each and every aspect of a dynamical system to be represented in the math model. The product should be durable, less noisy, powerful, as well as elegant. The most challenging factor among these requirements is system noise and vibration, because better comfort means less noisy as perceived by the customers. Few years before almost all the major automotive industry were relaying with FEM and BEM based approach for building the model for addressing low and mid frequency issues (up to 3000Hz). The aim of this paper is to provide a review of literature on the analysis techniques and validation methods used to address NVH issue in power-train systems, and also it covers the analysis procedures on present and future trends]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901671</guid>
    </item>
    <item>
      <title>Experimental Research on Identification of Ground-borne Noise from Subway Lines Based on Partial Coherence Analysis</title>
      <link>https://trid.trb.org/View/1901657</link>
      <description><![CDATA[The definition of how ground-borne noise is radiated into rooms in surrounding buildings due to underground subway lines is diverse in different countries, especially in the dominant frequency range. In the present paper, a set of field tests were carried out in Suzhou city, China to obtain ground vibration induced by subway vehicles and radiated noise in buildings. Preliminary analysis of frequency range is 1-300Hz based on the strength of frequency domain analysis of the ground-borne vibration and noise and attenuation of vibration along propagation path. Furthermore, the ground-borne noise is recognized from the measured data by partial coherence function. Based on this theory, the contributions of different vibration sources to the noise are distinguished. The analyzed result shows that the recognized dominant frequency range of the ground-borne noise is between 20∼310Hz. This research also indicates a difference of A-weighted sound levels between the tested result and contrasting criterions.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901657</guid>
    </item>
    <item>
      <title>Velocity Jumps in Road-Vehicle Dynamics</title>
      <link>https://trid.trb.org/View/1901638</link>
      <description><![CDATA[Vehicles on roads are excited to vertical vibrations and velocity fluctuations as the consequence of the random up and down of road surfaces. For resonant car vibrations in case of critical velocities effected by the constant driving force, the one-modular velocity density bifurcates into bi-modular distributions with two peaks; i.e. the car velocity is fluctuating around two mean values with permanent jumps between both. These effects are derived by means of quarter car models and second order stochastic roads which are non-linearly coupled to the along and across dynamics of the vehicle.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901638</guid>
    </item>
    <item>
      <title>Dynamics Analysis of Wheel Rail Contact Using FEA</title>
      <link>https://trid.trb.org/View/1901654</link>
      <description><![CDATA[A rail wheel contact mechanism has been a keen interest area for railway engineers. The present study focuses on the influence of interacting wheel and rail profile topology. A standard rail UIC 60 and standard wheel profile, as per the standards of Indian railways, were taken for different rail profile radii, wheel profile radii and wheel profile tapers. The mathematical and numerical studies were done by using Quasi–Hertz and FE analysis to analyze the impact of the interacting wheel and rail profiles on the distribution of contact zones and stresses. Moreover, the effect of contact forces and contact stresses on the deformation of rolling wheels and rails were also evaluated. The effect of lateral movement in the evaluation of frictional forces was found using Kalker theory.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901654</guid>
    </item>
    <item>
      <title>Progressive Collapse of a Cable Stayed Bridge</title>
      <link>https://trid.trb.org/View/1901596</link>
      <description><![CDATA[Progressive collapse is a persistent spread and enlargement of initial local failure of structures characterized by a discrepancy between the initial failure and its resulting extensive collapse. Although great efforts have been contributed to the progressive collapse of building structures, comparably small attention has been paid to the bridge structures, especially the cable-stayed bridges. This study demonstrates modelling and analysis of a typical cable stayed bridge through a nonlinear dynamic procedure. Furthermore, the response of the structural model is discussed for multiple types of critical cable loss cases. The results indicated a decrease in the possibility of failure progression of the cable stayed model when the location of the failed cables was closer to the pylon. A definite progressive collapse pattern was also identified along this procedure.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901596</guid>
    </item>
    <item>
      <title>Dynamic Characterization of Connections in Plane Frames Using SFFEM</title>
      <link>https://trid.trb.org/View/1901586</link>
      <description><![CDATA[In the construction of civil engineering structures, two or more members are often rigidly connected to increase the structural integrity. These rigid joints are often designed with bolts, rivets and welding. The actions of in-service loading and environmental effects, or fabrication errors make these joints semirigid, which ultimately reduces the structural reliability. Realistic dynamic analysis of these structures requires accurate modelling of rigidity of joints. Dynamic analysis of plane frames can be accomplished by combining spectrally formulated Rod and Euler-Bernoulli Beam element. In this study, a six parameter spectral plane frame joint element is formulated using linear and rotational springs to account for semi-rigidity of joints. Methodology and experimental set up for evaluation of dynamic characteristics of connections is discussed in this paper.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901586</guid>
    </item>
    <item>
      <title>Implementation of Taguchi Method for Robust Suspension Design</title>
      <link>https://trid.trb.org/View/1901578</link>
      <description><![CDATA[In this paper, Taguchi method of robust optimization has been adapted along with Design of Experiments methodology and ANOVA to reduce the variability in the Ride comfort of a vehicle with respect to sprung mass of vehicle. It aims to find a combination of tyre pressure, spring stiffness and damping coefficient which gives a constant and targeted comfort value with reduced variance. The analysis suggests that the tyre pressure of 35psi with the spring stiffness of 26,000N/m and damper of damping coefficient 418 N-s/m, maximize the SN ratio and reduce the deviation in RC due to mass, hence resulting into a robust design.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901578</guid>
    </item>
    <item>
      <title>Conditions of Visibility of Bridge Natural Frequency in Vehicle Vertical Acceleration</title>
      <link>https://trid.trb.org/View/1901563</link>
      <description><![CDATA[For structural health monitoring, selected bridges are generally instrumented and recorded data are utilized to obtain the natural frequency. However, this method is expensive and cannot cover all the bridges. Hence an alternative way for finding the bridge natural frequency is to utilize the vertical acceleration of moving vehicle. In the present paper spectrogram of vehicle vertical acceleration obtained theoretically has been analyzed to determine the conditions for which fundamental or higher mode bridge frequencies are visible. A flexible vehicle model moving along a simply supported bridge has been analyzed. Effect of vehicle / bridge mass ratio and surface roughness conditions on the visibility of bridge natural frequency have been investigated.]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901563</guid>
    </item>
    <item>
      <title>Advances in Aero Structures</title>
      <link>https://trid.trb.org/View/1901562</link>
      <description><![CDATA[With the advent of high performance computing the approximate engineering approach of 20th century has given way to Science to Engineering approach directly from 17th century to 21st century. The concept of simultaneous design and optimization that began with Science Revolution with Brachistochrone Problem has helped in achieving optimum designs from the concept particularly in complex aeronautical structures. This paper describes through some examples the way in which aircraft structural designs can be produced in a short period of time using SBES approach through HPC. Concept design of an aircraft wing given the loads and the airfoil shape from CFD Achieving a composite structure through optimization principles Impact analysis from bird hits Fluid Structure Interaction and flutter analysis Engine-Wing integrated structure analysis attempts]]></description>
      <pubDate>Mon, 24 Jan 2022 17:24:23 GMT</pubDate>
      <guid>https://trid.trb.org/View/1901562</guid>
    </item>
    <item>
      <title>Resistance Calculation and Motions Simulation for Free Surface Ship Based on CFD</title>
      <link>https://trid.trb.org/View/1747901</link>
      <description><![CDATA[An unsteady Reynolds averaged Navier–Stokes method is developed to account for sinkage and trim effects in the calculation of steadily advancing surface ship. Volume of fluid method (VOF) is devised for the treatment of free surface. The sinkage and trim were predicted by using dynamic mesh technology, and the motion of ship is controlled by six degrees of freedom (6DOF) code. Predicted results for sinkage and trim and resistance at seven Froude numbers (from Fn= 0.15 to Fn= 0.45) were compared against experimental data, showing good agreement. A plenty of numerical simulations for resistance of ship model under different running attitudes are carried out. On these bases, the results of numerical simulation and the factors which affect ship resistance are analyzed, and the formulas for calculating the ship resistance under different drafts and longitudinal trims and arbitrary drift-trim coupled running attitudes are deduced and validated.]]></description>
      <pubDate>Sat, 07 Nov 2020 16:20:12 GMT</pubDate>
      <guid>https://trid.trb.org/View/1747901</guid>
    </item>
    <item>
      <title>Collaborative Optimization of Container Ship on Static and Dynamic Responses</title>
      <link>https://trid.trb.org/View/1748043</link>
      <description><![CDATA[A new improved collaborative optimization (CO) model is used to optimize a container ship structure on static and dynamic responses. The new CO model provides solution capabilities for multiobjective multidisciplinary optimization problems. The system level objective function is advised to minimize relative value between the global optimal solution and the single disciplinary optimal solution. The subsystem level objective function is advised that includes the disciplinary objective function and the modified consistency constraint. The discrete design variable sets including the thickness of plate and the model number of beam are depicted with matrix. The objective functions are how to get the minimum structural mass in the static analysis and how to minimize the maximum acceleration of structure in the dynamic analysis. The proposed model was demonstrated with an optimization problem of stiffness plate under static and seismic loading. Then the model was used to optimize a container ship structure. The optimal design obtained indicates the great potential of decreasing structural mass and vibration level and increasing natural frequency reserve under the strength and stiffness requirements. The analysis progress and results show that the model is feasible and well-suited for using in actual optimization problems of ship design.]]></description>
      <pubDate>Sat, 07 Nov 2020 16:20:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/1748043</guid>
    </item>
    <item>
      <title>Modal Analysis of a Cable-stayed Bridge</title>
      <link>https://trid.trb.org/View/1747987</link>
      <description><![CDATA[The project involved in this paper is a single-tower double-cable-plane bridge, and the gulf nearby the bridge is in a typical typhoon-affected zone. Therefore, modal analysis of the cable-stayed bridge should be carried out. In this paper, based on the structural vibration theory and the theory of finite element method (FEM), the space FEM model of the cable-stayed bridge is established with APDL — ANSYS Parametric Design Language. Vibration mode and its frequency can be concluded by the calculating of the cable-stayed bridge's FEM model.]]></description>
      <pubDate>Sat, 07 Nov 2020 16:20:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/1747987</guid>
    </item>
    <item>
      <title>Design and Implementation of Remote Health Monitoring System for 3D Visual Bridge</title>
      <link>https://trid.trb.org/View/1742480</link>
      <description><![CDATA[With the growing concern about the safety, durability and normal use function of large and important bridge, the research and development of bridge health monitoring system is developed. The purpose of this paper is to realize the system of real-time monitoring and security analysis results show the three-dimensional visualization, this paper studies the three-dimensional visual model of the bridge real-time security monitoring system. According to the functional requirements, the system is divided into three parts, such as 3D graphics engine, 2D graphics engine, database interface and so on. According to the idea of modern software engineering, a complete set of system architecture is designed, which makes the above modules work with high cohesion and low coupling. The system to the system development methods of the modern software engineering based, to all kinds of design patterns as a skeleton, integrated use of 3D modeling and rendering technology and GDI + and SQL database technology on the MFC platform is a great progress of the combination of computer software technology and monitoring system. At the same time, the success of the system development, the trial prove greatly improves the efficiency of the monitoring system of bridge, to predict bridge safety hidden trouble, ensuring the safe operation of the bridge to the very important role to promote the bridge monitoring technology development.]]></description>
      <pubDate>Tue, 27 Oct 2020 12:25:40 GMT</pubDate>
      <guid>https://trid.trb.org/View/1742480</guid>
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