scholarly journals Modeling the operation of road pavement during the thawing of soil in the subgrade of highways

2018 ◽  
Vol 239 ◽  
pp. 05001 ◽  
Author(s):  
Aleksandr Isakov ◽  
Denis Razuvaev ◽  
Irina Gudkova ◽  
Michael Chakhlov
Keyword(s):  
Structural Strength ◽  
Layer By Layer ◽  
Software Complex ◽  
The Road ◽  
Road Pavement ◽  
Thermophysical Modeling

The solution for modeling the operation of road pavement during the thawing of soil in the subgrade of highways is proposed in this work. A model for layer-by-layer thawing of soil in the subgrade of highways was developed and illustrated, including the stage of modeling the change in the strength of the road structure during the thawing of soil, determining the dependence of the structural strength on the depth of soil thawing, thermophysical modeling of the process of freezing/thawing of soil in the subgrade using a software complex “Freeze-1” developed by the SSTU with determination of the dependence of the structural strength on time.

scholarly journals Modeling the operation of road pavement during the thawing of soil in the subgrade of highways

2018 ◽  
Vol 239 ◽  
pp. 05008
Author(s):  
Aleksandr Isakov ◽  
Denis Razuvaev ◽  
Irina Gudkova ◽  
Michael Chakhlov
Keyword(s):  
Structural Strength ◽  
Layer By Layer ◽  
Software Complex ◽  
The Road ◽  
Road Pavement ◽  
Thermophysical Modeling

The solution for modeling the operation of road pavement during the thawing of soil in the subgrade of highways is proposed in this work. A model for layer-by-layer thawing of soil in the subgrade of highways was developed and illustrated, including the stage of modeling the change in the strength of the road structure during the thawing of soil, determining the dependence of the structural strength on the depth of soil thawing, thermophysical modeling of the process of freezing/thawing of soil in the subgrade using a software complex “Freeze-1” developed by the SSTU with determination of the dependence of the structural strength on time.

scholarly journals DETERMINATION OF ADDITIONAL HEALTH RISK DUE TO POLLUTANTS IN AMBIENT AIR DURING OPERATION OF ROAD-VEHICLES COMPLEX

2018 ◽  
Vol 97 (12) ◽  
pp. 1171-1178 ◽  
Author(s):  
Yu. A. Rakhmanin ◽  
A. V. Levanchuk ◽  
Olga I. Kopytenkova ◽  
N. M. Frolova ◽  
A. M. Sazonova
Keyword(s):  
Air Pollution ◽  
Health Risk ◽  
Population Health ◽  
Air Pollutants ◽  
Ambient Air ◽  
Residential Areas ◽  
Road Vehicles ◽  
The Road ◽  
Road Pavement

Introduction. According to the materials of the World Health Organization, air pollutants are one of the most significant factors affecting the health of the population. The main urban air pollution source is road transport. The determination of air pollutants amount during the operation of the road-vehicles complex (RVC) with suspended substances is an important procedure for monitoring the risk to human health, planning, and evaluation of measures for the protection of residential areas ambient air. The existing methodical documents and regulations do not fully regulate important aspects of air pollution monitoring and assessment by-products caused by exhaust gases of the vehicle and emissions associated with the operation of the RVC. Thus, the purpose of this study is to determine the additional population health risks due to pollutants reaching the air of residential areas during the RVC operation. Material and methods. The method of emissions measurement reaching the air during the operation of the RVC is based on existing methodical documents and regulations. To assess the pollution, the data of observations of the intensity of traffic flow in different time periods in the experimental territories are used. The calculation of pollutants amount released into the air during the operational wear of the RVC is determined separately for the tire treads, brake system, and road pavement. Results. Guided by the constructed nomogram, taking into account distribution zone of the air pollution, it is possible to determine population health risk during the RVC operation in the city based on the calculation of the hazard coefficient. Discussion. On the basis of the calculations, data on the number of pollutants reaching the air during the RVC operation (wear of tire treads, brake system, road pavement) and from vehicles of various types for 1 year are presented. The data on the pollutants quantities generating on the road on a per 1 km car run basis, reaching the ambient air for various periods of time (hours, days) with the aim of the derivation of the spatial-temporal characteristics of the pollutants. On the basis of the obtained data, approximate calculations of the number of pollutants reaching the air during the operation of the RVC from all vehicles registered by St. Petersburg traffic police at the moment and the forecast for the period 2020 were carried out. Сonclusions. The given data on the hazard coefficient calculation of suspended solids emissions of RVC allow summarizing the risk from all the compartmental RVC sources. On the basis of the distance from the road to residential buildings presented in the nomogram, it is possible to determine an additional population health risk due to pollutants reaching the air during the RVC operation using a mathematical model of dispersion.

scholarly journals The estimation of stereovision precision in road inspection

2014 ◽  
Vol 13 (4) ◽  
pp. 259-266
Author(s):  
Marcin Staniek
Keyword(s):  
Stereo Vision ◽  
Input Data ◽  
Spatial Representation ◽  
Spatial Description ◽  
The Road ◽  
Road Pavement ◽  
Precise Evaluation ◽  
Road Inspection ◽  
Proper Analysis

The estimation of stereovision precision in road inspection was determined by the analysis of the distribution of differences between measurements: the stereo vision method and the method of direct measurement with the use of laser distance meter. The carried out analysis is aimed at verifying the type of mapping error of a road surface. The input data was obtained from 160 measurement sections which feature both a different type and a different condition of road pavement. The estimated method of road inspection is based on the stereo vision method of surface representation. Spatial representation of the road is obtained from the images recorded through taking stereo sequences of images by the measurement vehicle moving along the studied section of the road. The proper analysis of the image-based data and the application of mathematical transformations allow for determination of technical and functional parameters of the road. Spatial description allows for a precise evaluation of the state of a road pavement, which in traditional methods of image processing, without information about the depth, is difficult to be achieved and often burdened with errors of qualification of road distresses.

Mechanical effects and paradoxical phenomena in the thermoelastic stress of the road pavement structures

2018 ◽  
pp. 128-145
Author(s):  
Volodynyr Mozghovyi ◽  
◽  
Viktor Gaidaichuk ◽  
Yurii Zaiets ◽  
Liudmyla Shevchuk ◽  
...  
Keyword(s):  
Thermoelastic Stress ◽  
The Road ◽  
Mechanical Effects ◽  
Road Pavement ◽  
Pavement Structures

METHOD FOR ESTIMATING ERRORS IN MEASURING INSTRUMENTS BY THE SPACE CATALOGUE ORBITS

2018 ◽  
pp. 76-84
Author(s):  
K. V. Sorokin ◽  
E. A. Sunarchina
Keyword(s):  
Dynamic Model ◽  
New Method ◽  
Measuring Instruments ◽  
Measuring Instrument ◽  
Software Complex

Improvement of orbits precision is one of the most important tasks of space surveillance catalogue maintenance. The solution of this problem is directly related to an adequate consideration of the errors of the coordinate information from the measuring instruments. The article consideresd a new method for estimating the precision of measuring instruments on the catalog orbits. To carry out such analysis, in PJSC «VIMPEL» special technological program was created. Main results of a study of radar errors with orbits of space surveillance catalogue was presented. Also, the results were compared with data of measuring instrument's calibration software complex. This software complex provides determination of satellite's position with errors less than 10 m. A new dynamic model of measuring instrument errors is proposed.

scholarly journals The use of cement concrete pavements for roads, depending on climatic conditions

2019 ◽  
Vol 13 (3) ◽  
pp. 235-240
Author(s):  
Iryna Solonenko
Keyword(s):  
European Union ◽  
Statistical Models ◽  
Road Network ◽  
The European Union ◽  
Rational Selection ◽  
Cement Concrete ◽  
The Road ◽  
Road Pavement ◽  
Operational Characteristics ◽  
Selection Of

The development of road network infrastructure is an important component of the economic development of the European Union. Updating of the road network contributes to the integration of the economies of countries into a coherent whole. The road network provides the free movement of citizens, the movement of goods and the effective implementation of various services. The increase in the length of the road network leads to an increase in the financial and material costs necessary to ensure its maintenance and repair. One of the ways to reduce costs is by strengthening the physic-mechanical and operational characteristics of the pavement due to the widespread use of cement concrete. The quality of the pavement of cement concrete depends largely on the rational selection of its composition. This allows a significant increase in the durability of road pavement. The purpose of the research was: the development of recommendations for the rational selection of the composition of the road pavement material of cement concrete, aimed at upgrading longevity, and taking into account its frost resistance grade. According to the goal, the following tasks were developed: the analyses of the climatic zones in which the road network of the European Union is located; the development of a research plan, a selection of the response function and influence factors; the study of physico-mechanical and operational characteristics of the researched material of road pavement; on the basis of the obtained data, the calculation of the complex of experimental-statistical models, which describe the physico-mechanical and operational characteristics of the road pavement material; on the basis of experimental statistical models, a method was proposed for selecting the rational compositions of the cement concrete pavement road material depending on the conditions of its application. The results presented in the article can be used in engineering and scientific practice for the selection of road pavement from cement concrete for highways.

scholarly journals The Evaluation of Experimental Variables for Sustainable Virtual Road Safety Audits

2021 ◽  
Vol 13 (11) ◽  
pp. 5899
Author(s):  
Yeonsoo Jun ◽  
Juneyoung Park ◽  
Chunho Yeom
Keyword(s):  
Road Safety ◽  
Traffic Light ◽  
Scenario Development ◽  
Driving Simulators ◽  
Traffic Condition ◽  
The Road ◽  
Road Pavement ◽  
Net Promoter ◽  
Road Safety Audits ◽  
Road Marking

This paper evaluates experimental variables for virtual road safety audits (VRSAs) through practical experiments to promote sustainable road safety. VRSAs perform road safety audits using driving simulators (DSs), and all objects in the road environment cannot be experimental variables because of realistic constraints. Therefore, the study evaluates the likelihood of recommendation of VRSA experimental variables by comparing DSs experiments and field reviews to secure sustainable road safety conditions. The net promoter score results evaluated “Tunnel”, “Bridge”, “Underpass”, “Footbridge”, “Traffic island”, “Sign”, “Lane”, “Road marking”, “Traffic light”, “Median barrier”, “Road furniture”, and “Traffic condition” as recommended variables. On the contrary, the “Road pavement”, “Drainage”, “Lighting”, “Vehicle”, “Pedestrian”, “Bicycle”, “Accident”, and “Hazard event” variables were not recommended. The study can be used for decision making in VRSA scenario development as an initial effort to evaluate its experimental variables.

scholarly journals The Limestone as a Materials Combination of Base Course on the Road Pavement

2021 ◽  
Vol 1125 (1) ◽  
pp. 012019
Author(s):  
Yosef Cahyo Setianto Poernomo ◽  
Sigit Winarto ◽  
Zendy Bima Mahardana ◽  
Dwifi Aprillia Karisma ◽  
Rekso Ajiono
Keyword(s):  
The Road ◽  
Road Pavement ◽  
Base Course ◽  
On The Road

scholarly journals Determination of the region of the limiting states occurrence in RVS-20000 with the subsidence of the external bottom contour

2018 ◽  
Vol 239 ◽  
pp. 06002
Author(s):  
P.V. Chepur ◽  
A.A. Tarasenko ◽  
A.A. Gruchenkova
Keyword(s):  
Technical Condition ◽  
Element Analysis ◽  
Metal Structures ◽  
Software Complex ◽  
Managerial Decisions ◽  
The Finite Element Analysis ◽  
Steel Tank ◽  
Intrinsic Stiffness ◽  
Bottom Contour

The problem of the limiting states occurrence in the structures of a vertical steel tank is investigated in this work. To study the SSS of the metal structures of the object, the authors created a numerical model of the RVS-20000 tank in the ANSYS software complex. The model considers the maximum number of elements with their geometry and connections affecting the tank SSS under non-axisymmetric loading, including beyond the elasticity of steel. Dependences between the parameters of intrinsic stiffness of the VST are obtained. The results of the finite element analysis made it possible to develop a technique for assessing the technical condition of the structure with the development of irregular subsidence of the external bottom contour. The proposed technique can be used by both operating and design organizations in making managerial decisions regarding the repair of RVS-20000 subjected to the base subsidence.

Theoretical progress in the H2+ molecular ion: towards electron to proton mass ratio determinationThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 103-107 ◽  
Author(s):  
J.-Ph. Karr ◽  
L. Hilico ◽  
V. I. Korobov
Keyword(s):  
High Resolution ◽  
Mass Ratio ◽  
Theoretical Determination ◽  
Atomic Systems ◽  
The Road ◽  
Theoretical Progress ◽  
Proton Mass ◽  
Accuracy Level ◽  
Ratio Determination

High resolution ro-vibrational spectroscopy of H 2+ or HD+ can lead to a significantly improved determination of the electron to proton mass ratio me/mp if the theoretical determination of transition frequencies becomes sufficiently accurate. We report on recent theoretical progress in the description of the hyperfine structure of H 2+ , as well as first steps in the evaluation of radiative corrections at order mα7. Completion of the latter calculation should allow us to reach the projected 10−10 accuracy level and open the road to mass ratio determination.

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