• Title/Summary/Keyword: 보링

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A Roundness Evaluation of Al-6061 Turning by Orthogonal Table and Multiple Linear Regression (직교배열에 의한 선삭과 회귀분석방법에 의한 Al-6061의 진원도 평가)

  • Jang, Sung-Min;Back, Si-Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.1
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    • pp.45-50
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    • 2012
  • This paper on analysis of roundness error after boring turning of Al-6061 materials with CNC lathe. Experiment applying turning parameters is based on experimental design method. A design and analysis of experiments is conducted to study the effects of these parameters on the roundness error using the S/N ratio and analysis of ANOVA. Multiple linear regression analysis is applied to compare experimental with predicted data in consideration of roundness error. To fixation pressure and the opening which are a turning parameter, the cutting depth and feed speed respected the objective attainment of dissertation and to be applied the result they investigated.

A Study of the Boring Bar Vibration Measurement using Optical Fiber Sensor (보링바 고유진동 계측을 위한 광섬유 진동센서 연구)

  • Song, Doo-Sang;Hong, Jun-Hee;Jeong, Hwang-Young;Kang, Dae-Hwa;Kim, Byung-In
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.4
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    • pp.107-113
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    • 2009
  • In this paper, we studied of measurement the vibration of natural frequency using optical fiber sensor. The boring bar for measurement of vibration in use optical fiber sensor has the advantage of direct measure for the frequency than accelerometer. Because it deal with output value on electrical signal of optical fiber in physical disturbance when it measures the frequency of vibration. The optical fiber sensor measured the vibration of boring bar by the gap in sensing jig while optical fiber just kept contact with boring bar. A prototype system was composed of jig part with gap and optical system part. In this paper, we found out the possibility to measurement of vibration by the gap in use optical fiber.

Image Processing based on Tensor Voting and its Applications (텐서 보팅에 기반한 영상처리 및 응용)

  • Park, Jong Hyun;Park, Soonyoung;Lee, Guee Sang
    • Smart Media Journal
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    • v.1 no.2
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    • pp.23-33
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    • 2012
  • In this paper, the characteristics of tensor voting, which are used extensively in image processing and computer vision, have been surveyed. In general, tensor voting can infer the structural features like junctions, curves, regions and surfaces from n-dimensional data given as points, curve elements or surface patch elements. Currently various perceptual grouping methods based on such structural inference are studied and are used for diverse applications on images or scenes. Tensor voting provides robustness to noises and demonstrates itself efficient in many applications.

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A Study on Practical Problem Solving for Speed Ripple Rejection in TBM with Regenerative Startup (TBM 회생기동법에서의 속도리플 제거를 위한 실제적 문제 해결에 관한 연구)

  • Kim, TaeKue;Seo, JeongWon
    • Journal of Korea Society of Industrial Information Systems
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    • v.24 no.6
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    • pp.35-42
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    • 2019
  • In this paper, we analyze the practical problems of the regenerative start method proposed to improve the starting characteristics of the TBM(Tunnel boring machine)system and propose a solution. In order to solve the speed ripple problem in the previous research results, we first analyze the problems occurring in the system and propose a method to compensate for them. By applying the improved method to the actual system, we compared the results with the conventional system and verified the effect of the proposed method.

The Corrosivity Evaluations on Soil Surrounding the Buried Steel Piles under Manufacturing Plants (플랜트 하부의 강파일 인접 토양의 부식성 평가)

  • Jung, Sungwon;Park, Kyeong-Wan;Jeon, Jae-Young
    • Plant Journal
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    • v.12 no.1
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    • pp.37-43
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    • 2016
  • The corrosivity evaluations on soil surrounding the buried steel piles under manufacturing plants. It was proven that the soil structure of this sample area is composed of several soil layers, and that each layer show the different corrosivity. The predicted average corrosion rates of some layers are about 0.33mm/y, which is over than the general corrosion rate, 0.01-0.02mm/y.

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Development of a GUI Program for the Design of a Vibration Control Boring Bar with a Tube-Type Structure (튜브 타입 제진용 보링바 구조설계를 위한 GUI 프로그램 개발)

  • Guo, Yang-Yang;Park, Jong-Kweon;Hong, Jun-Hee;Song, Doo-Sang
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.25 no.4
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    • pp.295-300
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    • 2016
  • In the design of passive and active boring bars, the structural dimensions and shape of the vibration control boring bar are modified depending on the diameter and depth of the workpiece, which changes the dynamic behavior. Thus, the natural frequency, effective mass, and stiffness for the main structure of a tube-type boring bar need to be reset for each vibration control case. However, commercial finite element method (FEM) software and experimental modal analysis are mostly used at present despite being too time-consuming. To overcome the weaknesses of the two methods currently used for vibration control, we realized a graphical user interface (GUI) program for the modal analysis of a modified tube-type damping structure. The analysis results with the GUI program were compared to those with commercial FEM software in order to confirm the effectiveness of the former.

The chatter vibration in metal cutting using the low stiffness tool (저강성 공구를 이용한 절삭에서의 채터 진동)

  • 김정석;이병호
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.3
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    • pp.424-432
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    • 1989
  • A mathematical model is developed for determination of the dynamic cutting force from static cutting data. The dynamic cutting force is analytically expressed by the static cutting coefficient and the dynamic cutting coefficient which can be determined from the cutting mechanics. The proposed model is verified by the chatter stability charts. A good agreement was shown between the stability limits predicted by the theory and the critical width of cut determined by experiments. The static cutting coefficient dominates high speed chatter stability, while the dynamic cutting coefficient dominates low speed chatter stability.

Experimental and Numerical Methods for Thermal Conductivity of Backfill Soils for Subsea Pipeline (해저배관 뒤채움 흙의 열전도율 산정에 관한 실험 및 수치 해석적 연구)

  • Park, Dong-Su;Seo, Young-Kyo
    • Journal of Ocean Engineering and Technology
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    • v.31 no.2
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    • pp.103-110
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    • 2017
  • The temperature of subsea pipeline, approximately as high as $100^{\circ}C$, is significantly higher than the temperature of surrounding sea water and sediment. In this reason, heat can be lost from the subsea pipeline to cause serious operation problem. Therefore it is important that the subsea pipeline must be designed to ensure that heat loss is small enough. Heat loss of unburied pipeline is higher than buried pipeline. For that purpose, trenching and backfilling system is a commonly used method for maintaining flow assurance in subsea pipeline installation. For this commonly used method, knowing thermal conductivity of backfill is essential to protect a heat loss of pipeline. This paper presents thermal conductivity of backfill soil using laboratory model test and numerical analysis for various backfill. In conclusion, it can be seen that higher the sand content of the man-made backfill sample, the higher the thermal conductivity. On the other hand, as the water content increases, the thermal conductivity becomes smaller.

A Study on the Shear Modulus of Weathered Granite Soil by Pressuremeter Tests (공내재하시험을 이용한 화강풍화토의 전단계수 산정)

  • Kim, Jong-Soo;Lee, Kyu-Hwan;Lee, Chang-Tok;Lee, Song
    • Geotechnical Engineering
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    • v.13 no.6
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    • pp.95-106
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    • 1997
  • A pressuremeter is an expandable tube which is placed in the soil, and then expanded under controlled condition against the soil. From this test a pressure expansion curve of the soil can be obtained. However soil disturbance during the test has significant influence on the results of tests. A general governing equation for pressuremeter test can be theoretically derived on the basis of the hyperbolic soil model and the cavity expansion theory. The curve fitting technique was used to establish the pressure-strain curve without disturbance of soil during testing. This interpretation makes use of both the loading and unloading portions of the test. An interpretation methodology is described and illustrated with pressuremeter test data carried out in the weathered granitic soil to estimate initial shear modulus. Standard penetration test is a very common site investigation technique in Korea. Therefore the blow counts of standard penetration test are discussed by comparing them with initial shear modulus.

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Uncertainty Analysis of Soft Ground Using Geostatistical Kriging Method (지구통계학 크리깅 기법을 이용한 연약지반의 불확실성 분석)

  • Yoon Gil-Lim;Lee Kang-Woon;Chae Young-Su
    • Journal of the Korean Geotechnical Society
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    • v.21 no.3
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    • pp.5-17
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    • 2005
  • Spatial uncertainty of Busan marine clay ground, which commonly occurs during site investigation testing, data analysis and transformation modeling, has been described. In this paper geotechnical uncertainty of shear strength indicator $N_k$ has been quantified in both horizontal direction and vertical direction using geostatistical Kriging method. Most of soil data used are from 25 boring tests, 75 laboratory tests, 124 field vane tests and 25 cone penetration tests (CPT). CPT-$N_k$ data for undrained shear strength determination, which are the most important properties in geotechnical design stages, have been analysed. Comparison between cone factor from conventional CPT-based method and that of geostatistical method shows that geostatistical Kriging method is an ideal tool to quantify the spatial variability of uncertainty from self-correlation of soil property of interest, and can be recommended to identify the spatial distribution of consolidation .md shear strength of soils at any sites concerned.