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Development of Hole Expansion Test for Sheet Materials Using Pattern-Recognition technique

TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS A 2013年第2期37卷 161-168页

作者： Jang, Seung Hyun Kim, Chan Il Yang, Seung Han Kim, Young Suk Kyungpook Natl Univ Dept Mech Engn Daegu South Korea Kyungpook Natl Univ Inst Mech Engn Technol Daegu South Korea

Nowadays, one of the most interested area of automobile industry is the production of vehicle which has collision safety and ability to produce less amount of CO2. The achievement of such a dual performance is done by choosing the materials like dual phase steel, ferrite bainite steel, etc. These steels have been used in automotive chassis and body parts, and also used to be formed by hole flanging to meet the goal of strength and design requirement. The formability of sheet material was experimented by hole expansion test and the judgement relies on human eye and his experience. This manual judgement involves many errors and large deviation. This paper develops the automatic crack recognition system which finds a crack based on CCD image to complement the problem of the current method depending on human's sense.

关键词： Pattern Recognition technique image processing technique Hole Expansion Test Hole Expansion Ratio(HER)

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Measurement for the Thickness of Water Droplets/Film on a Curved Surface with Digital image Projection (DIP) technique

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SENSORS 2020年第8期20卷 2409-2409页

作者： Zeng, Lingwei Wang, Hanfeng Li, Ying He, Xuhui Cent South Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China Cent South Univ Natl Engn Lab High Speed Railway Construct Changsha 410075 Hunan Peoples R China Hong Kong Polytech Univ Dept Mech Engn Hung Hom Kowloon Hong Kong 999077 Peoples R China

Digital image projection (DIP) with traditional vertical calibration cannot be used for measuring the water droplets/film on a curved surface, because significant systematic error will be introduced. An improved DIP technique with normal calibration is proposed in the present paper, including the principles, operation procedures and analysis of systematic errors, which was successfully applied to measuring the water droplets/film on a curved surface. By comparing the results of laser profiler, traditional DIP, improved DIP and theoretical analysis, advantages of the present improved DIP technique are highlighted.

关键词： water droplets film curved surface digital image projection DIP image processing technique

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A study on observation and growth behavior of small surface cracks by remote measurement system

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KSME JOURNAL 1996年第4期10卷 396-404页

作者： Nahm, SH Lee, HM Suh, CM KYUNGPOOK NATL UNIV POOK KUTAEGU 702701SOUTH KOREA

A new experimental system using remote measurement system(RMS) and image processing technique was applied for studying the growth behavior of small surface fatigue cracks in 1Cr -1Mo-0.25V steel at room temperature. The system includes a long distance focusing microscope, a CCD camera, a light source, a 3-axis controller, a monitor, a personal computer and a data translation card. The measurement error of the system appeared to be 0.8%. It is possible for this system to measure down to 30 mu m of surface fatigue crack length. The length of surface fatigue crack could be successfully measured by the RMS during testing as well as after the test. The growth rate of small cracks on smooth specimens was represented in terms of stress intensity factor and J-integral. At equivalent elastic stress intensity factor levels, the growth rate of small surface cracks was not consistent and faster than that of long crack of CT specimen.

关键词： surface fatigue crack small crack 1Cr-1Mo-0.25V steel remote measurement system stress intensity factor J-integral image processing technique

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Performance evaluation of Si/Fe3O4 nanoparticles in water-based mud in presence of different Mg²⁺, K⁺, Na⁺ salts: experimental and stability visualization study

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CHEMICAL PAPERS 2024年第15期78卷 8379-8396页

作者： Lalji, Shaine Mohammadali Ali, Syed Imran Lashari, Zeeshan Ali Panjwani, Suresh Kumar Burney, Muneeb NED Univ Engn & Technol Dept Petr Engn Karachi Pakistan Dawood Univ Engn & Technol Dept Petr & Gas Engn Karachi Pakistan MOL Pakistan Oil & Gas Co Ltd BV Islamabad Pakistan

The revolutionized field of nanotechnology emerged in the oil and gas sector to enhance drilling fluid performance. This technology increases the success rate of drilling operations in different environments. However, their performance in presence of various salts has not been entirely discovered up till now. In this research, three different salt mud systems that include KCl, NaCl and MgCl2 were prepared and coated with silica iron oxide nanoparticles. The rheological and filtration characteristics of all the samples with the joint interaction of salt and nanoparticles were analyzed. Additionally, the stability of the mud samples after the interaction between the two entities was investigated using a visualization tool. This unique application will be useful in observing the changes in the mud system during nonproductive time events (NPT). The result of the study reveals that all the fluids in the presence of these entities showed shear thinning behavior with flow index <1. Reduction in shear stresses in the salt systems was observed mainly because of the neutralization of the negative charges associated with the base mud system. However, this behavior was weaker in monovalent cations as compared with divalent. KCL/(Si/Fe3O4) demonstrates the most stable mud system when investigated through intensity profile plots. Minimum segregation and maximum dispersion were the key parameters that demonstrated its stability. Moreover, all three cations in the presence of Si/Fe3O4 nanoparticles reduce the filtrate loss volume and provide a thin and smooth mud cake. The Si/Fe(3)O(4 )because of its spherical bead shape plugs the pore spacing of the filter paper while blocking of microsize spacing was done with the help of cations.

关键词： Filtration behavior image processing technique Intensity profile plots Rheological properties

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The tip point feature of pakchoi recognition and virtual plant modelling based on image processing

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IFAC-PapersOnLine 2016年第16期49卷 439-444页

作者： bo, Liu chengliang, Liu liang, Gong yuanshen, Zhao qianli, QL.Liu. Chen Department of Mechanical and Electronic Engineering Shanghai Jiao Tong University Shang-hai200240 China

image processing is one of the key technologies in virtual agriculture. In this paper, the image processing technology is combined in pakchoi virtual modeling. By extracting the contour curve, the minimum circumscribed plants and the feature of tip points of the pakchoi, a virtual two-dimensional geometric model of pakchoi was established. This modelling method is simple and the model can reflect the number of leafs, leaf relative size and the growth of plant. This study has important significance in researching the growth model of pakchoi, image feature point recognition and virtual modelling. © 2016

关键词： image processing Feature extraction Geometric modeling image feature points image processing technique image processing technology Key technologies Modelling method Pakchoi Virtual modeling

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Spiral Concentrator Interface Monitoring Through image processing: A Statistical Learning Approach

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IFAC-PapersOnLine 2017年第2期50卷 53-58页

作者： Nienaber, Ernst C. McCoy, John T. Auret, Lidia Department of Process Engineering Stellenbosch University Private Bag X1 Matieland7602 South Africa

Spiral concentrators are robust gravity separation devices that allow for concentration of slurry streams. Optimal splitter position (which determines recovery and grade) is dependent on the interface positions of the concentrate, middlings and/or tailings in the trough. Various image processing techniques have been proposed to automatically detect interface positions, which could be useful for spiral concentrator monitoring and control. Two methods are compared in this work: the first is the previously-described genetic algorithm optimization of the parameters of a traditional edge detection algorithm. The second uses logistic regression, a well-known statistical classifier. The performance of the two methods was compared on two data sets, for ilmenite and chromite concentration. The logistic regression method was shown to outperform the genetic algorithm approach, in terms of computational cost of training and successful interface detections on test data, for both the relatively easy ilmenite concentrate interface, and the more challenging chromite concentrate interface. © 2017

关键词： image processing Classification (of information) Concentration (process) Edge detection Genetic algorithms Ilmenite Learning systems Multiplexing equipment Process monitoring Regression analysis Edge detection algorithms Genetic algorithm approach Genetic algorithm optimizations image processing technique Logistic regression method Mineral processing Statistical classifier Statistical inference

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Accurate Estimation of shell position using triangulation method for calibration of RPS

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IFAC-PapersOnLine 2018年第1期51卷 225-230页

作者： Sachan, D.K. Kumar, P. Dwivedi, P.N. Bhattacharya, A. Scientist D.R.D.O. Hyderabad India

To calibrate the Radio proximity sensor (RPS), an experiment has been conducted with shell firing. Two High speed cameras have been used to track the shell. For calibration purpose, the accurate position of shell with respect to time has been estimated using triangulation method. Accurate knowledge of orientation and position of camera is very important for accurate estimation of shell's position. Pole with known marking has been used here for computing the orientation of camera. image processing technique has been used here for the computation of centroid of shell. With the help of this experiment, the accurate calibration of RPS has been achieved. © 2018

关键词： Oil field development Calibration Estimation High speed cameras image processing Shells (structures) Triangulation Accurate estimation image processing technique Shell Triangulation method

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Quantitative image Analysis of Carbon Nanostructure of Particles Produced from Combustion Process

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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2018年第3期18卷 2148-2151页

作者： Choi, Seuk-Cheun Park, Seul-Hyun Korea Inst Ind Technol KITECH Cheonan 331822 South Korea Chosun Univ Dept Mech Syst Engn Gwangju 501759 South Korea

In the present study, the soot particles produced from diffusion flames burning biodiesel fuel were thermophoretically sampled and the carbon nanostructure of soot particles were imaged using a high resolution transmission electron microscopy (HRTEM). The HRTEM images of soot particles were then quantitatively analyzed using a digital image processing algorithm developed and implemented as part of this work. The HRTEM interpretations with an aid of image processing support feasibility of use of the developed image processing technique for carbon nanostructure quantification.

关键词： Carbon Nanostructure Soot Particles image processing technique

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A novel gas-liquid contactor for chemisorption of CO₂

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SEPARATION AND PURIFICATION TECHNOLOGY 2012年 94卷 115-123页

作者： Kundu, A. Basu, J. K. Das, G. Indian Inst Technol Dept Chem Engn Kharagpur 721302 W Bengal India

Increased emission of green house gases to the atmosphere due to rapid revolution of industry is potential threat for climate change. Gas scrubbing using aqueous amine solutions is one of the most promising retrofit options for post combustion carbon dioxide capture today. This is conventionally done in spray tower, bubble column and packed column. In the invited paper, a novel contacting device has been proposed for improved chemisorption of CO2. It is based on the absorption of CO2 during its rise as axisymmetric bullet shaped Taylor bubbles through millichannel. Investigations have been made to understand the influence of DEA concentration, inlet gas composition and pipe diameter on percent absorption of CO2 and CO2 loading. The experimental results have shown that percent CO2 removal and CO2 loading increases while absorption rate decreases with decrease of pipe diameter. This information can be exploited for optimizing the input parameters to maximize efficiency of carbon dioxide removal. The present device is expected to be a starting point for the development of slug flow millireactors capable of continuous and enhanced CO2 absorption. (C) 2011 Elsevier B.V. All rights reserved.

关键词： Chemisorption Taylor bubble Percentage absorption Carbon dioxide loading image processing technique

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Flow pattern analysis of artificial heart valves using high speed camera and PIV technique 21

Flow pattern analysis of artificial heart valves using high ...

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21st International Congress on High-Speed Photography and Photonics

作者： LEE, DH SEO, SW MIN, BG SEOUL NATL UNIV DEPT BIOMED ENGNSEOUL 110744SOUTH KOREA

ISBN: (纸本)0819418722

Artificial heart valve is one of the most important artificial organs which have been implanted to many patients. The most serious problems related to the artificial heart valve prothesis are thrombosis and hemolysis. In vivo experiment to test against this problem is complex and hard work. Nowadays the request for in vitro artificial heart valve testing system is increasing. Several papers have announced us that the flow pattern of artificial heart valve is highly correlated with thrombosis and hemolysis. LDA is a usual method to get flow pattern, which is difficult to operate, is expensive and has narrow measure region. PIV (Particle image Velocimetry) can solve these problems. Because the flow speed of valve is too high to catch particles by CCD camera and high-speed camera (Hyspeed; Holland-Photonics) was used. The estimated max flow speed was 5 m/sec and max trackable length is 0.5 cm, so the shutter speed was determined as 1000 frames per sec. Several image processing techniques (blurring, segmentation, morphology, etc.) were used for the preprocessing. Particle tracking algorithm and 2D interpolation technique which were necessary in making gridrized velocity profile, were applied to this PIV program. By using Single- Pulse Multi-Frame particle tracking algorithm, some problems of PIV can be solved. To eliminate particles which penetrate the sheeted plane and to determine the direction of particle paths are these. 1D relaxation formula is modified to interpolate 2D field. Parachute artificial heart valve which was developed by Scoul National University and Bjork-Shiely valve was testified. For each valve, different flow pattern, velocity profile, wall shear stress, turbulence intensity profile and mean velocity were obtained. Those parameters were compared with the result of in vivo experiment. In this experiment we can conclude wall shear stress is not high enough to generate hemolysis and higher turbulence intensity to make more hemolysis. For further appli

关键词： ARTIFICIAL HEART VALVE THROMBOSIS HEMOLYSIS IN VITRO TEST FLOW PATTERN PIV(PARTICLE image VELOCIMETRY) HIGH-SPEED CAMERA image processing technique SINGLE-PULSE MULTIFRAME TRACKING

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