Results 71 to 80 of about 1,769,252 (349)

Computer Simulation Models for Consideration of Seasonal Trends Influence on the Structural Dynamics of Bridges

Communications, 2019
Elimination of seasonality temperature trends in a structural health monitoring of bridges is considered in the article. On example of a beam bridge, eigenfrequencies are plotted against seasonal fluctuations of environmental temperature.
Taisiya V. Shepitko, Elena S. Shepitko, Vladimir S. Afanasev   +2 more
doaj   +1 more source

Design of Railway Track Model with Three-Dimensional Alignment Based on Extended Industry Foundation Classes

Applied Sciences, 2020
Building information modeling (BIM) has been widely applied in conjunction with the industry foundation class (IFC) for buildings and infrastructure such as railways.
T. Kwon, Sang I. Park, Young-Hoon Jang, Sang-Ho Lee   +3 more
semanticscholar   +1 more source

Critical expansion points: Mechanical signs of surrounding rock instability

Deep Underground Science and Engineering, EarlyView.
This study proposes the Rock Bearing‐Expansion Model (RockBEM) with critical expansion points (CEPs) to quantify post‐peak damage stages in deep‐buried rock masses via plane strain compression test (PSCT). CEP hysteresis&interval ratios reveal bearing performance dynamics and failure severity, advancing mechanistic insights into deep underground rock ...
Jiaqi Wen, Chang Deng, Haijun Wang, Lei Tang, Jihong Yu   +4 more
wiley   +1 more source

The railway superstructure monitoring in bratislava tunnel no. 1 – section of ballastless track and its transition areas

MATEC Web of Conferences, 2017
The requirements for the quality of the railway track with emphasis on its long service life, low maintenance costs and the required parameters of the track geometry have led railway infrastructure manager on the territory of the Slovak Republic ...
Izvolt Libor, Sestakova Janka, Smalo Michal   +2 more
doaj   +1 more source

Contribution to the Methodology of the Determination of the Thermal Conductivity Coefficients Λ of Materials Applied in the Railway Subbase Structure

Communications, 2013
The paper focuses on the methodology of determination of thermal conductivity coefficients λ of the construction materials of railway subbase. The determination of the thermal conductivity coefficients λ depends on the determination of the specific heat ...
Libor Izvolt, Peter Dobes, Martin Mecar
doaj   +1 more source

Experimental Monitoring of Transition Zones in Railway Tunnels

Civil and Environmental Engineering, 2023
The expert research activity of transition zones of tunnels is one part of the overall set of these places on the railway line. Typical places where the stiffness of the railway changes are the portals of tunnels, where undesirable deformations occur ...
Hodas Stanislav, Pultznerova Alzbeta, Vrchovsky Erik   +2 more
doaj   +1 more source

Motion planning and control of an installation robot for attitude adjustment of arc parts in underground shield tunneling

Deep Underground Science and Engineering, EarlyView.
Inspired by spiders, the multilegged walk‐through assembling robot for arc parts achieves high‐precision synchronous control under heavy loads through dual‐layer hydraulic pose dynamics modeling and hierarchical pressure optimization, significantly enhancing shield tunneling assembly efficiency and precision.
Quan Xiao, Guofei Xiang, Liang Liao, Lai Wei, Hongli Wang, Songyi Dian   +5 more
wiley   +1 more source

Analysis of Results of Monitoring and Prediction of Quality Development of Ballasted and Ballastless Track Superstructure and its Transition Areas

Communications, 2016
Securing durability of parameter quality of track alignment design and track geometry is a goal of each railway infrastructure manager. To accomplish this goal, various methods and procedures are applied, but they are all based on regular diagnostics ...
Libor Izvolt, Janka Sestakova, Michal Smalo   +2 more
doaj   +1 more source

Real Time Identification of Railway Track Surface Faults using Canny Edge Detector and 2D Discrete Wavelet Transform

, 2020
Usually, railway accidents are caused by train derailment, the mechanical failure of tracks, such as broken rails often caused by lack of railway condition monitoring.
A. Shah, B. S. Chowdhry, T. Memon, I. H. Kalwar, J. A. Ware   +4 more
semanticscholar   +1 more source

Prediction of railway track geometry defects: a case study

Structure and Infrastructure Engineering, 2020
The aim of this study has been to develop a data-driven analytical methodology for prediction of isolated track geometry defects, based on the measurement data obtained from a field study.
I. Soleimanmeigouni, A. Ahmadi, A. Nissen, Xun Xiao   +3 more
semanticscholar   +1 more source