• 제목/요약/키워드: Dimensional characteristics

검색결과 5,214건 처리시간 0.037초

고출력 CW Nd:YAG 레이저를 이용한 CSP 1N 박판 절단공정의 열전달 특성 분석 (A Study on Heat Transfer Characteristics of Laser Cutting for the CSP 1N Sheet Using High-power CW Nd:YAG Laser)

  • 안동규;김민수
    • 한국기계가공학회지
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    • 제5권1호
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    • pp.51-58
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    • 2006
  • The objective of this research work is to investigate into heat transfer characteristics of the laser cutting of CSP 1N sheet using high power CW Nd:YAG laser. In order to investigate the heat transfer characteristics, three dimensional quasi stationary and steady-state heat transfer analysis has been carried out. The laser heat source is assumed as a volumetric heat source with a gaussian heat distribution in a plane. Through the comparison of the results of analyses with those of experiments, the proper finite element model has been obtained. In addition, characteristics of the three-dimensional heat transfer and temperature distribution have been estimated by the finite element model. Finally, the minimum temperature at the center for cutting of the material has been estimated.

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금속의 절삭성 평가를 위한 2-3차원 어트랙터 시스템의 구축 (Construction of 2-3 Dimensional Attractor System for Cutting Characteristics Evaluation of Metals)

  • 윤인식;이종대
    • 한국공작기계학회논문집
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    • 제14권2호
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    • pp.8-13
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    • 2005
  • This study proposes the construction of 2-3 dimensional attractor system for cutting characteristics evaluation of metals. Also this paper aims to find the optimal cutting conditions of diamond turning machine by measuring surface form and roughness to perform the cutting experiment of metals, which are aluminum, with diamond tool. As well, according to change cutting conditions such as feed rate, using diamond turning machine to perform cutting processing, by measuring cutting force and surface roughness and according to cutting conditions the aluminum about cutting properties. Trajectory changes in the attractor indicated a substantial difference in attractor characteristics. Constructed 2-3 dimensional attractor system in this study can be used for cutting characteristics evaluation of metals.

Analysis of Mechanical Characteristics of Polymer Sandwich Panels Containing Injection Molded and 3D Printed Pyramidal Kagome Cores

  • Yang, K.M.;Park, J.H.;Choi, T.G.;Hwang, J.S.;Yang, D.Y.;Lyu, M.-Y.
    • Elastomers and Composites
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    • 제51권4호
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    • pp.275-279
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    • 2016
  • Additive manufacturing or 3D printing is a new manufacturing process and its application is getting growth. However, the product qualities such as mechanical strength, dimensional accuracy, and surface quality are low compared with conventional manufacturing process such as molding and machining. In this study not only mechanical characteristics of polymer sandwich panel having three dimensional core layer but also mechanical characteristics of core layer itself were analyzed. The shape of three dimensional core layer was pyramidal kagome structure. This core layer was fabricated by two different methods, injection molding with PP resin and material jetting type 3D printing with acrylic photo curable resin. The material for face sheets in the polymer sandwich panel was PP. Maximum load, stiffness, and elongation at break were examined for core layers fabricated by two different methods and also assembled polymer sandwich panels. 3D printed core showed brittle behavior, but the brittleness decreased in polymer sandwich panel containing 3D printed core. The availability of 3D printed article for the three dimensional core layer of polymer sandwich panel was verified.

가상환경에서의 3차원 포인팅작업 성능평가 모형 (Performance estimation model of the three-dimensional pointing tasks in virtual environment systems)

  • 박재희;박경수
    • 대한인간공학회:학술대회논문집
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    • 대한인간공학회 1996년도 춘계학술대회논문집
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    • pp.253-258
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    • 1996
  • Virtual reality environment system is expected to be used as a new user interface tool oweing to its high immersiveness and high interactivity. To use VR interface effectively, we should identify the characteristics of the three-dimensional control tasks as if we did in two-dimensional graphic user interface environments. As a first step, we validated Fitts'law for the three-dimensional pointing tasks with the two input devices, Spaceball and Spacemouse. Different from the two-dimensional control tasks, VR pointing tasks needed inclusion of a new variable, size of the moving object, to Fitts'law. The modified

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가솔린엔진 흡기매니폴드의 흡기유량 및 분배특성 (Intake-Air Flow and Distribution Characteristics of the Gasoline Engine Intake-Manifold)

  • 염경민;박성영
    • 한국산학기술학회논문지
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    • 제12권11호
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    • pp.4718-4725
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    • 2011
  • 본 연구는 성능 해석을 통하여 1600cc급 흡기매니폴드의 흡기유량 및 분배특성에 대한 연구를 수행하였다. 일차원 엔진 성능해석 프로그램과 3차원 유동해석프로그램을 이용하여 해석을 수행하였다. 흡기 매니폴드의 정상상태 유동해석을 수행한 결과, 일차원 유동해석과 3차원 유동해석의 유량계수 표준편차는 1% 미만으로 우수한 분배특성을 나타내었다. 일차원 해석 결과가 3차원 결과 대비 미소하게 증가된 결과를 보였지만 동등한 유량계수 경향성을 나타냈다. 비정상상태 해석은 분배특성 측면에서 정상상태 해석 결과와 유사한 결과를 보였으며, 정상상태 해석결과를 통한 비정상상태 분배특성의 예측이 가능함을 확인하였다.

시모그래피의 조형성을 응용한 현대 패션 디자인의 표현유형과 미적 특성 연구 (Expression types and aesthetic characteristics of modern fashion applying the formativeness of symmography)

  • 권기영
    • 복식문화연구
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    • 제29권3호
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    • pp.361-373
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    • 2021
  • The purpose of this study is to contribute to the role of lines in creative design development by analyzing the expression types and aesthetic characteristics of modern fashion using geometric formativeness of symmography. A literature study was conducted of works since 2009 to examine the general consideration of lines together with analysis of the concept and characteristics of symmography in the formative arts field, and to analyze the expression types and aesthetic characteristics of modern fashion design using the formativeness of symmography. The infinite sense of formativeness and original expression of symmography are used in formative arts such as space design, installation art, and industrial design. Expression types of modern fashion design using geometric formativeness of symmography can be classified into the following three types: two-dimensional graphic pattern, relief surface, and three-dimensional spatial. First, the two-dimensional graphic pattern type forms an optical pattern, providing individuality and visual interest to the textile design. Second, the relief surface type expresses the plane in various ways, so that the thickness changes according to how lines overlap. Third, the three-dimensional spatial type expands the boundaries of clothing and creates a fantastic spatial beauty. Next, the aesthetic formativeness of fashion design using symmography can be classified into repetitive rhythmicity, geometric self-similarity, and optical spatiality. Symmography enables a myriad of geometric patterns to be developed depending on material, color, and the designer's imagination, and helps inspire a variety of designs in fashion that sculpt a three-dimensional human body.

Considerations about the Development of Three-dimensional Display Systems Adopted for Human Visual Field

  • Yano, Sumio
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.1183-1186
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    • 2009
  • We have developed several three-dimensional display systems matched to human visual field characteristics. In this article, we describe these systems corresponding to a close-range, mid-distance and distance view, and also the image pickup equipments related to these display systems.

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준설토의 체적변화 및 2차원 퇴적특성에 관한 연구 (A Study on the Sediment Volume Change and Two-dimensional Deposited Characteristics of Pumping-dredged Soil)

  • 김형주;이민선;이용주;김대우
    • 한국지반공학회논문집
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    • 제19권4호
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    • pp.155-165
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    • 2003
  • 본 연구는 고함수비의 액상준설토의 체적변화 및 퇴적특성을 파악하기 위해 일련의 실린더침강시험, 침투압밀시험과 2차원퇴적모형실험이 실시되었다. 그리고 실험결과는 실제 준설매립현장의 퇴적상태와 비교됨으로써 설계시에 필요한 침강에 의한 체적변화량을 구할 수 있도록 하였으며, 퇴적후의 세립토의 분포와 함수비 변화 등이 함에 조사되었다. 따라서 1차원 침강시는 실질토량이 증가 할 수록 퇴적고는 선형적으로 증가하며, 자중압밀개시시 및 완료시의 계면고도 또한 실질토량에 비례하여 증가되고 있다. 한편 2차원 퇴적모형실험에 의해 함수비의 분포와 세립토의 퇴적상태를 제시하였으며, 퇴적층의 함수비는 #200체의 통과량에 따라 다르며 최소 30%에서 최대 180%까지 폭넓게 분포되고 있다.

2차원 해석을 이용한 초전도 발전기 계자 코일의 퀜치 특성 (Quench Characteristics of Field Winding in a superconducting Generator Using 2-Dimensional Analysis)

  • 강준선;나완수;최세용;권영길;손명환;류강식
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 2000년도 KIASC Conference 2000 / 2000년도 학술대회 논문집
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    • pp.177-179
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    • 2000
  • In this paper, we analyzed quench characteristics of field windings using 2 dimensional analysis. The quench origin was assumed to take place at the inner most point in the mid-plane of the coil. The temperature distribution was numerically calculated on the coil cross section using FDM analysis, and was used to estimate the normal zone resistance of the coil. Finally, we obtained voltage current characteristics of the quenched winding coils.

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고속 주축계의 자켓의 유량 변화에 따른 냉각 특성 (A Study on the Cooling Characteristics of Cooling-Jacket in High-Speed Spindle according to the Flow Rate)

  • 김태원;김수태;최대봉;김태형
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2000년도 추계학술대회논문집 - 한국공작기계학회
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    • pp.332-336
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    • 2000
  • Cooling characteristics of cooling jacket for spindle system with built-in motor are studied. For the analysis, three dimensional model for the cooling jacket is built by using finite volume method. The three dimensional model includes the estimation on the amount of heat generation of bearing and built-in motor and the thermal characteristic values such as heat flux on the boundary. Numerical results show that flow rate are important factors for cooling characteristics of cooling jacket.

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