• Title/Summary/Keyword: weaving

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Analysis of Traffic Flow on Weaving Sections Using Stochastic Models (확률모형을 이용한 엇갈림 구간의 교통류분석)

  • 이승준;이정도;최재성
    • Journal of Korean Society of Transportation
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    • v.17 no.5
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    • pp.137-149
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    • 1999
  • For decades, many traffic flow studies on the analysis and determination of level of service (LOS) for the weaving sections have been made to Provide several regression equations. Weaving and non-weaving speeds were dependent variables for the equations, with independent variables being weaving length, number of lanes, and weaving ratios. One of the difficulties in developing the equations was that the weaving areas were rare in Korea, so the statistical analyses for calibrating the equation parameter could not be performed in a desirable manner. In this regard, a new and stochastic methodology for predicting the weaving and non-weaving speeds within the weaving sections was required. In this study the following design variables were developed; influence area of the weaving section. headway distribution within the weaving section, maximum weaving volume of the weaving section, length of the ideal weaving section, and speed estimations for the weaving and non-weaving flows. The evaluation of the new model was made comparing the delay in the weaving section with the one in the freeway basic section.

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A Study on Freeway Weaving Section Analysis (고속도로의 엇갈림 구간 분석에 관한 연구)

  • 최병국;정준화
    • Journal of Korean Society of Transportation
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    • v.10 no.1
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    • pp.21-40
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    • 1992
  • We examine primarily the existing study procedures for freeway weaving section by comparing speed estimates. Most methods have poor predictions because of neglecting the weaving vehicle influ-ence. In this study we develop the speed prediction equation considering the weaving influence area i.e, weaving box. Assuming that speeds outside weaving box are similar to speeds in freeway basic sec-tions we develop speed equation in box based on the field data. Moreover level of service criteria and weaving analysis precedure are proposed under the new speed prediction equation.

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A study on Dobby Weave Design using Computer-Aided Weaving System (CAW(Computer-Aided Weaving) 시스템을 이용한 도비 직조디자인 연구)

  • Song, Ha-Young
    • Fashion & Textile Research Journal
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    • v.12 no.3
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    • pp.272-278
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    • 2010
  • The purpose of this study was to research about Dobby weave design using Computer-Aided Weaving System. For performing this design study, first, it was researched the characteristics of the classified woven fabrics, weaving processing, structure of Dobby loom, and Computer-Aided Dobby Weaving system theoretically. To develop Dobby woven design, Patternland Weave Simulator(U.S.A) for computer weave system was used. Among the developed Dobby woven designs by computer weaving system, mainly three of them were selected and woven into Dobby loom. To see the visual image of the fabric end-use, some of the scanned Dobby fabrics were simulated to the three-dimensional virtual images by Alias CAD system. The result of this study can be summarized as follows. Before the step of weaving Dobby fabrics on the woven design works, Computer-Aided Weaving system can be done very easily to apply the design step of Dobby woven fabrics, specially in case of the complicated woven structure. Also the usage of the simulation CAD system in visual image of the final products, ultimately can be saved cost and developed the higher value-added goods in more response to consumer demands.

An Empirical Analysis of the Behavior of Weaving Traffic in a Freeway Weaving Section (고속도로 위빙(Weaving) 구간의 교통행태에 대한 경험적 분석)

  • 유경수
    • Journal of Korean Society of Transportation
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    • v.6 no.1
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    • pp.17-31
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    • 1988
  • In this research, the behavior of weaving traffic is studied in terms of lane-changing behavior and gap acceptance characteristics. General trends in lane-changing behavior and gap acceptance characteristics are investigated by analyzing descriptive statistics and the factors affecting weaving behavior are determined by means of the multiple linear regression analysis. The results of analysis show that the behavior of weaving traffic is generally similar to that in a basic freeway section and an on- or of- ramp section. Traffic density and speed appear to be better parameters than traffic volume for explaining the behavior of weaving traffic. For the same purpose, using the traffic conditions of the origin and the destination lanes are found to be more effective than using the average traffic conditions of the freeway. A detailed analysis of the gap acceptance characteristics of late merging vehicles shows that there is no significant difference between the size of gaps accepted by late merging vehicles and that accepted by early merging vehicles.

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A New Planning Algorithm of Weaving Trajectory Using Bezier Spline for A Welding Robot (Bezier Spline을 이용한 용접 로봇의 새로운 Weaving Motion 궤적 생성 알고리즘)

  • 정원지;김대영;서영교;홍형표;홍대선
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.3
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    • pp.113-118
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    • 2004
  • In this paper, we propose a new weaving trajectory algorithm for the arc welding of a articulated manipulator. The algorithm uses the theory of Bezier spline. We make a comparison between the conventional algorithms using Catmull-Rom curve and the new algorithms using Bezier spline. The proposed algorithm has been evaluated based on the MATLAB environment in order to illustrate its good performance. Through simulations, the proposed algorithm can result in high-speed and flexible weaving trajectory planning so that it's trajectory cannot penetrate into a base metal compared to the conventional algorithm using Catmull-Rom curve.

A New Planning Algorithm of Weaving Trajectory Using Bezier Spline (Bezier Spline을 이용한 새로운 Weaving Motion 궤적 생성 알고리즘)

  • 김대영;김재량;정원지;서영교;홍형표
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1760-1763
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    • 2003
  • In this paper, we propose a new weaving trajectory algorithm for the are welding of a articulated manipulator. The algorithm uses the theory of Bezier spline. We make a comparison between the conventional algorithms using Catmull-Rom curve and the new algorithms rising Bezier spline. The proposed algorithm has been evaluated based on the MATLAB environment in order to illustrate its good performance. The algorithm has been implemented on to the industrial manipulator of DR6 so as to show its real possibility. Through simulations and real implementations, the proposed algorithm can result in high-speed and flexible weaving trajectory planning and can reduce the processing time because it needs one-half calculation compared to the conventional algorithm using Catmull-Rom curve.

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SPARSE ORTHOGONAL MATRICES BY WEAVING

  • Cheon, Gi-Sang
    • Korean Journal of Mathematics
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    • v.7 no.1
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    • pp.61-69
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    • 1999
  • We determine sparse orthogonal matrices of order $n$ which is fully indecomposable by weaving.

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A New Algorithm of Weaving Motion Using Bezier Spline

  • Chung, Won-Jee;Hong, Dae-Sun;Kim, Dae-Young;Seo, Young-Kyo;Hong, Hyung-Pyo
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.2743-2746
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    • 2003
  • In this paper, we propose a new weaving trajectory algorithm for the arc welding of a articulated manipulator. The algorithm uses the theory of Bezier spline. We make a comparison between the conventional algorithms using Catmull-Rom curve and the new algorithms using Bezier spline. The proposed algorithm has been evaluated based on the MATLAB environment in order to illustrate its good performance. The algorithm has been implemented on to the industrial manipulator of DR6 so as to show its real possibility. Through simulations and real implementations, the proposed algorithm can result in high-speed and flexible weaving trajectory planning and can reduce the processing time because it needs one-half calculation compared to the conventional algorithm using Catmull-Rom curve.

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Development of an Effective Arc Sensing Algorithm for Seam-Tracking in Flux-Cored Arc Welding Process for Horizontal Fillet Joints (FCAW 수평 필릿용접용 용접선추적을 위한 아크센싱 알고리즘 개발)

  • 권순창;최재성;장낙영
    • Journal of Welding and Joining
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    • v.15 no.1
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    • pp.66-80
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    • 1997
  • This paper describes a newly developed arc-sensing algorithm of seam-tracking for FCA W (flux-cored arc welding) horizontal fillet welding. In this algorithm, arc current and the Weighted-Are-Current (WAC) are used to adjust the position of a weld torch in directions of bead throat and weaving, respectively. The WAC, which is newly devised in this study, means that arc current in the vicinity of weaving end is more emphasized than that in the center of weaving. The reason of this is because there usually exists much noise in the center of weaving due to abrupt change of arc length in case some empty gaps exist in a fillet joint Variance analysis was performed in order to check the effect of weld parameters on arc current and the WAC. As a result, the relationships between tip-to-workpiece distance and arc current, and between weaving offset and the WAC were established.To check "the validity of the algorithm, seam-tracking experiments were performed ;mder various welding condition. The result of experiments showed a satisfactory tracking performance in the presence of empty gaps in a horizontal fillet joint.et joint.

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A Study of Heat Input Distribution on the Surface during Torch Weaving in Gas Metal Arc Welding

  • Kim, Y.;Park, H.
    • International Journal of Korean Welding Society
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    • v.4 no.1
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    • pp.23-29
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    • 2004
  • In weaving welding where a V groove exists, the heat input distribution is an important factor that determines the defectiveness of the bead shape, undercut and over-lap. In this study, the amount of heat input, which is determined by the welding current, voltage, speed and weaving conditions is calculated through mathematical development and numerical methods. Furthermore, the heat input distribution as a two- dimensional heat source was observed when applied to each groove.

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