Development of an advanced inspection system for weathering steel bridges based on digital image recognition

2008 ◽  
Author(s):  
S Goto ◽  
T Aso ◽  
A Miyamoto
Keyword(s):  
Image Recognition ◽  
Digital Image ◽  
Steel Bridges ◽  
Inspection System ◽  
Weathering Steel

scholarly journals Evaluation of Digital Image Recognition Methods for Mass Spectrometry Imaging Data Analysis

2018 ◽  
Vol 29 (12) ◽  
pp. 2467-2470 ◽  
Author(s):  
Måns Ekelöf ◽  
Kenneth P. Garrard ◽  
Rika Judd ◽  
Elias P. Rosen ◽  
De-Yu Xie ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Data Analysis ◽  
Image Recognition ◽  
Digital Image ◽  
Mass Spectrometry Imaging ◽  
Imaging Data

scholarly journals Thickness of Corrosion Layers on Typical Surfaces of Weathering Steel Bridges

2016 ◽  
Vol 142 ◽  
pp. 56-62 ◽  
Author(s):  
Vít Křivý ◽  
Viktor Urban ◽  
Monika Kubzová
Keyword(s):  
Steel Bridges ◽  
Weathering Steel

scholarly journals Development of a Structural Integrity Non-destructive Inspection System for Bridges Made of Weathering Steel

2019 ◽  
Vol 278 ◽  
pp. 03006
Author(s):  
Björn Torsten Salmen ◽  
Marina Knyazeva ◽  
Frank Walther
Keyword(s):  
Structural Steel ◽  
Crack Detection ◽  
Structural Integrity ◽  
Test Methods ◽  
Point Of View ◽  
Inspection System ◽  
Weathering Steel ◽  
Steel Bridge ◽  
Electro Magnetic ◽  
Non Destructive

Due to the increasing volume of traffic, bridges are exposed to higher loads as it was considered during the planning phase. Therefore, a regular inspection is necessary in order to detect cracks at very early stages. The use of weathering structural steel in bridges, as well as in composite bridge constructions is an alternative to conventional bridges, not only from an economic but also from an ecological point of view, since it is not necessary to apply a corrosion protection layer and renew it during the lifetime of the bridge. Unfortunately, conventional visual inspection or magnetic particle inspection on the weathering steel bridge are hindered by the protective patina and requires development of new test methods. Within the framework of this project, a combined crack detection technique using non-destructive inspection by means of Active Thermography and by Electro-Magnetic Acoustic Transducer (EMAT) were evaluated in laboratory environments and in real conditions on bridge structures made of weathering structural steel.

Development of Cable Inspection System Based on Image Processing

2014 ◽  
Vol 602-605 ◽  
pp. 2199-2204
Author(s):  
Huan Liu ◽  
Chao Tao Liu
Keyword(s):  
Image Processing ◽  
Feature Extraction ◽  
Image Segmentation ◽  
Image Enhancement ◽  
Image Recognition ◽  
Host Computer ◽  
Inspection System ◽  
Energy Distributions ◽  
Single Motor ◽  
Image Acquisition System

A stayed cable inspection system was developed which consists of robot, host computer, cameras and image acquisition system. The robot was driven with single motor and could climb cables of various and variable diameters. Pictures of the cables’ were taken by the robot, and the defects and mars were identified automatically with image recognition. The steps of image recognition includes image de-noising, image enhancement, image segmentation, feature extraction, and recognition with the features of the images’ histogram grayscale distributions and energy distributions.

VERIFICATION OF REPAIR PAINTING EFFECT OF CORRODED WEATHERING STEEL BY EXPOSURE TEST

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Yuka Sugiyama ◽  
Toshihiko Aso ◽  
Atsumi Imai ◽  
Hiroaki Matsumoto
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Steel Surface ◽  
Steel Bridges ◽  
The Other ◽  
Weathering Steel ◽  
Water Leakage ◽  
Exposure Test ◽  
Repair Technique ◽  
Organic Zinc

Weathering steel generates dense protective rust on the steel surface. Since this protective rust would reduce corrosion speed, weathering steel can be used without any painting. Furthermore, the Life Cycle Cost of unpainted steel bridges would be lower than ordinary painted steel bridges. Due to these advantages, many weathering steel bridges have been constructed in recent years. Unfortunately, the generation of anomalous rust has been reported in some bridges, cause of water leakage or deicer. It is necessary to repair these bridges, but the repair technique for corroded weathering steel has never been established yet. This study aims to clarify the effect of various repair painting for corroded weathering steel by performing an exposure test. The exposure test has been carried out from September 2015 to Okinawa and Yamaguchi. Test in Okinawa is supplied airborne salt, and the test in Yamaguchi is not supplied airborne salt. Specimens, which produced anomalous rust, were repaired by 19 methods and exposed. As a result, it is effective to repair by organic zinc-rich paint in the area with airborne salt. On the other hand, it is appropriate to remove rust and salt on the steel surface by blasting in the area which is not supplied airborne salt.

Improved Algorithm for Wavelet Threshold Denoising and Application in Crack Image Recognition

2014 ◽  
Vol 945-949 ◽  
pp. 1846-1850
Author(s):  
Hai Biao Li ◽  
Xin Xia
Keyword(s):  
Image Recognition ◽  
Digital Image ◽  
Signal To Noise Ratio ◽  
Threshold Value ◽  
Image Noise ◽  
Threshold Function ◽  
Determination Method ◽  
Signal To Noise ◽  
Visual Effects ◽  
Edge Preservation

In crack image recognition, Donoho’s universal wavelet threshold de-noising method appears "over-kill" phenomenon due to the lack of self-adaptability of threshold value; hence the image may lose its edge details. To handle this problem, the Donoho’s universal threshold and threshold function are improved and an adaptive determination method of threshold coefficient is introduced in this paper. Experimental results shows that the proposed method can effectively remove digital image noise and achieve a better edge protection, higher edge preservation index, better visual effects and higher peak signal-to-noise ratio.

Experimental Corrosion Tests on Weathering Steel Bridges

2015 ◽  
Vol 227 ◽  
pp. 537-540 ◽  
Author(s):  
Vit Krivy ◽  
Katerina Kreislova ◽  
Viktor Urban
Keyword(s):  
Czech Republic ◽  
Experimental Testing ◽  
Steel Grade ◽  
Steel Bridges ◽  
Weathering Steel ◽  
Salt Solutions ◽  
The Czech Republic ◽  
Corrosion Tests ◽  
Corrosion Rates

The paper introduces the experimental corrosion tests that are carried out on the existing weathering steel bridges in the Czech Republic. The influence of the position and location of the surface in the structure on the resulting corrosion rates can be evaluated using this experimental testing. Typical surfaces of steel bridges are tested, e.g. webs of main girders, upper and lower surfaces of flanges, surfaces affected by leaking salt solutions. The corrosion tests to study the relation between steel grade (weathering steels S355J2WP and S355J2W) and corrosion rates are introduced in this paper as well.

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