Infrared-based determination of the type and condition of the road surface

2019 ◽  
pp. 360-370
Author(s):  
Lakshan Tharmakularajah ◽  
Jakob Döring ◽  
Karl-Ludwig Krieger
Keyword(s):  
Road Surface ◽  
The Road

scholarly journals DEVELOPMENT OF AN APPROACH TO DETERMINATION OF COUPLING QUALITIES OF ROAD COVERING USING WEATHER-CLIMATE FACTOR

2020 ◽  
pp. 1-7
Author(s):  
Anastasia Shevtsova ◽  
Alexander Novikov
Keyword(s):  
Road Safety ◽  
Traffic Management ◽  
Traffic Accidents ◽  
Road Surface ◽  
Climate Factor ◽  
The Road ◽  
Weather And Climate ◽  
Object Of Study

Assessing the grip of the road surface is an extremely important task both in the field of traffic management, and in the field of investigation and examination of traffic accidents. The coupling quality of the road surface is fully ensured by the grip coefficient, which is subject to constant monitoring in order to ensure road safety. There are a large number of methods for determining the magnitude of the grip coefficient. In their study, the authors propose an improved approach for determining the investigated value using the weather and climate factor. Previously, a group of researchers in the course of scientific research determined the dependence of the grip coefficient on the temperature of the road surface, as a result of mathematical analysis, the authors obtained a dependence that allows to determine the studied value by air temperature and the condition of the road surface (presence of precipitation). The performed experiment allowed us to test the obtained dependence within the framework of the object of study and to make a comparative assessment of the results obtained with the data obtained using the road laboratory.

scholarly journals Determination of Dynamic Loads from the Road Surface Acting on the Chassis by Experimental Methods

2020 ◽  
Vol 886 ◽  
pp. 012008
Author(s):  
Van Van Luong ◽  
Thanh Quang Nguyen ◽  
Hong Quan Le ◽  
Van Anh Le ◽  
Phuc Hoa Tran ◽  
...  
Keyword(s):  
Experimental Methods ◽  
Road Surface ◽  
Dynamic Loads ◽  
Surface Acting ◽  
The Road

Caster-Camber Relationship in Vehicles

2009 ◽  
Author(s):  
Reza N. Jazar ◽  
A. Khazaei ◽  
M. Mahinfalah ◽  
G. H. Nazari
Keyword(s):  
Screw Theory ◽  
Lateral Force ◽  
Road Surface ◽  
Roll Angle ◽  
The Road ◽  
Directional Stability ◽  
Camber Angle ◽  
Lean Angle

Lateral force of a tire depends on the sideslip and camber angles. Camber angle is the roll angle of a tire with respect to the road surface and may be a function of the vehicle roll angle. However, the camber angle may also be generated by a steer angle because of suspension and steering mechanisms. A steerable tire turns about a steering axis which can be determined by the caster and lean angles. The steered tire will gain a camber angle because of caster and lean angles. This camber-steering might be in favor or opposite to the direction the vehicle is supposed to turn. A few negative degrees caster angle is required for directional stability. Although the lean angle can be set to be zero, it is usually set to a few degrees positive value to help steering. Therefore, the camber angle of a steerable tire is a function of steering, caster, and lean angles in a nonlinear manner. In this investigation, we employ the screw theory to model the rotation of a tire about the steering axis kinematically. A set of equations will be found to determine the camber angle as a function of caster, lean, and steer angles. Determination of the associated camber trust due to steering would be the application of this study.

scholarly journals FEATURES OF CONDUCTING FIELD RESEARCH AT THE OBJECTS OF THE ROAD NETWORK AND LABORATORY STUDIES OF ROAD SURFACE SAMPLES DURING THE FORENSIC CONSTRUCTION AND TECHNICAL EXAMINATION AND FORENSIC EXAMINATION OF MATERIALS, SUBSTANCES AND PRODUCTS

2021 ◽  
pp. 768-785
Author(s):  
O. Posilskyi ◽  
O. Savenok ◽  
I. Chaliuk ◽  
І. Burlaka
Keyword(s):  
Asphalt Concrete ◽  
Road Network ◽  
Laboratory Tests ◽  
Water Saturation ◽  
Field Research ◽  
Average Density ◽  
Road Surface ◽  
The Road ◽  
Forensic Examination

According to the requirements of regulatory documentation, there are a large number of indicators measured for asphalt concrete. Modern expert practice shows that the forensic examination of asphalt concrete although relies on the research methods specified in GOST (National Standards of Ukraine), but requires its optimization. Carrying out field research at the objects of the road network, regulates the methodology, sequence and rules for measuring and taking samples of the road surface for laboratory tests. The main stages of research at the objects of the road network: I. Preparation for field research. II. Identification of the object on the ground. III. Inspection of the object of study in order to establish the characteristics and boundaries of the work. IV. Fixation (photo-video shooting, topography) of the performed works. V. Carrying out measurements of the volume of completed construction work. VI. Sampling. VII. Recording the results of research. VIII. Conducting laboratory tests. In turn, laboratory tests have the following main stages: I. Photo of packaging, photo of samples (center marks or cuttings). II. Numbering (marking) of research objects. III. Measuring the thickness of the center marks layers. IV. Mechanical separation of center marks or cuttings into layers. V. Washing objects and drying it to constant weight. VI. Determination of the average density of asphalt concrete. VII. Determination of water saturation. VIII. Making a pooled sample. IX. Determining the amount of astringent. X. Determination of the grain composition of the mineral part of the mixture. XI. Determination of the actual density of the mixture by pycnometric method (for RMACM). XII. Determination of residual porosity (for RMACM). XIII. Reshaping of samples (for HACM). XIV. Determination of the average density of reshaped samples. XV. Determination of water saturation of reshaped samples. XVI. Determination of compaction coefficient. XVII. Determination of compressive strength. The expert practice of the authors in this article made it possible to transform the stages of forensic examination of asphalt pavements so that the effectiveness of such examination has increased. The proposed methodology, sequence and rules of field research on the objects of the road network in terms of sampling of pavement and subsequent laboratory tests of these samples, enable experts to provide a qualitative and objective conclusion.

Tire-Road Interactions — Harmony or Conflict?

1989 ◽  
Vol 17 (1) ◽  
pp. 66-84
Author(s):  
A. R. Williams
Keyword(s):  
Rolling Resistance ◽  
Major Effect ◽  
Road Surface ◽  
Interactive Effects ◽  
Central Theme ◽  
Water Drainage ◽  
The Road ◽  
Truck Tires ◽  
Road Surfaces ◽  
Tire Wear

Abstract This is a summary of work by the author and his colleagues, as well as by others reported in the literature, that demonstrate a need for considering a vehicle, its tires, and the road surface as a system. The central theme is interaction at the footprint, especially that of truck tires. Individual and interactive effects of road and tires are considered under the major topics of road aggregate (macroscopic and microscopic properties), development of a novel road surface, safety, noise, rolling resistance, riding comfort, water drainage by both road and tire, development of tire tread compounds and a proving ground, and influence of tire wear on wet traction. A general conclusion is that road surfaces have both the major effect and the greater potential for improvement.

scholarly journals CNN-Based Road-Surface Crack Detection Model That Responds to Brightness Changes

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1402
Author(s):  
Taehee Lee ◽  
Yeohwan Yoon ◽  
Chanjun Chun ◽  
Seungki Ryu
Keyword(s):  
Surface Crack ◽  
Autonomous Vehicles ◽  
Crack Detection ◽  
Model Performance ◽  
Semantic Segmentation ◽  
Road Surface ◽  
Image Brightness ◽  
The Road ◽  
Detection Model ◽  
Artificial Intelligence Models

Poor road-surface conditions pose a significant safety risk to vehicle operation, especially in the case of autonomous vehicles. Hence, maintenance of road surfaces will become even more important in the future. With the development of deep learning-based computer image processing technology, artificial intelligence models that evaluate road conditions are being actively researched. However, as the lighting conditions of the road surface vary depending on the weather, the model performance may degrade for an image whose brightness falls outside the range of the learned image, even for the same road. In this study, a semantic segmentation model with an autoencoder structure was developed for detecting road surface along with a CNN-based image preprocessing model. This setup ensures better road-surface crack detection by adjusting the image brightness before it is input into the road-crack detection model. When the preprocessing model was applied, the road-crack segmentation model exhibited consistent performance even under varying brightness values.

scholarly journals Laboratory experiment on the nano-TiO2 photocatalytic degradation effect of road surface oil pollution

2020 ◽  
Vol 9 (1) ◽  
pp. 922-933
Author(s):  
Qing’e Wang ◽  
Kai Zheng ◽  
Huanan Yu ◽  
Luwei Zhao ◽  
Xuan Zhu ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Oil Pollution ◽  
Road Surface ◽  
Test Method ◽  
Driving Safety ◽  
The Road ◽  
Road Surfaces ◽  
The Many ◽  
The Impact ◽  
Degradation Effect

AbstractOil leak from vehicles is one of the most common pollution types of the road. The spilled oil could be retained on the surface and spread in the air voids of the road, which results in a decrease in the friction coefficient of the road, affects driving safety, and causes damage to pavement materials over time. Photocatalytic degradation through nano-TiO2 is a safe, long-lasting, and sustainable technology among the many methods for treating oil contamination on road surfaces. In this study, the nano-TiO2 photocatalytic degradation effect of road surface oil pollution was evaluated through the lab experiment. First, a glass dish was used as a substrate to determine the basic working condition of the test; then, a test method considering the impact of different oil erosion degrees was proposed to eliminate the effect of oil erosion on asphalt pavement and leakage on cement pavement, which led to the development of a lab test method for the nano-TiO2 photocatalytic degradation effect of oil pollution on different road surfaces.

scholarly journals Effects of Speeds and Weights of Travelling Vehicles on the Road Surface Temperature

2021 ◽  
pp. 100077
Author(s):  
Samim Mustafa ◽  
Hidehiko Sekiya ◽  
Aya Hamajima ◽  
Iwao Maeda ◽  
Shuichi Hirano
Keyword(s):  
Surface Temperature ◽  
Road Surface ◽  
The Road ◽  
Road Surface Temperature ◽  
On The Road

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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