• Title/Summary/Keyword: STL

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Apprehensive Streams Determination Method Using Discharged Pollution Load in ChungjuDam Watershed (배출부하량 자료를 활용한 충주댐 유역의 우심하천 결정 방법)

  • Choi, Yonghun;Park, Sangjoon;Jeong, Yeonji;Lim, Kyoungjae
    • Proceedings of the Korea Water Resources Association Conference
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    • 2022.05a
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    • pp.494-494
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    • 2022
  • 임의의 지점에서 하천의 수질은 해당 하천으로 유입되는 모든 지역의 오염원에 대한 영향을 받으므로 상류 소유역에 전체에 대한 복합적인 평가가 동반되어야 한다. 본 연구에서는 배출부하량 자료를 활용하여 충주댐 호소의 수질에 대한 상류 유역의 영향성을 평가하여 우심하천을 결정하는 방법을 제안하고, 충주댐 유역의 우심하천을 결정하였다. 충주댐 유역을 Korean Reach File (Version 3)에서 제공하는 182개 세유역으로 구분하였으며, 각각의 소유역에 대한 Straem Total Load (STL)를 산정하였다. 여기서, STL은 세유역의 하천으로 유입하는 모든 상류 세유역을 포함하는 단위면적당 배출부하량으로 명명하였다. 충주댐 본체가 포함된 세유역 (충주댐2-3)을 목표지역으로, 대상 수질 항목은 총인(TP)으로 선정하였다. 충주댐2-3 세유역의 STL은 0.0029 kg/ha/day이며, 상류 세유역의 STL이 목표 지역보다 높으면 댐호소 수질에 대한 영향이 큰 세유역으로 구분할 수 있다. 각각의 세유역에 대한 STL을 산정하면 장평천4 0.0191 kg/ha/day로 가장 높았으며, 주천강시점3 0.0089 kg/ha/day, 주천강상류1 0.0088 kg/ha/day 등의 순으로 나타났다. 또한 충주댐2-3의 STL보다 높은 세유역은 68개, 주요 우심하천은 장평천과 제천천 그리고 주천강 등으로 분류되었다. 또한 STL을 활용하면 상류 세유역에서 하류 세유역까지 배출부하의 이동 경향이 나타나므로 (최상류에서 높은 오염부하를 배출하여도 하류로 이동하며 낮은 오염부하를 배출하는 세유역과 합쳐지면 댐 호소의 수질에 대한 영향이 적은 것 등) 세유역의 배출부하 또는 단위면적당 배출부하로 우심지역을 평가하는 방법과의 차별성을 가지고 있다.

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Generating FE Mesh Automatically from STL File Model (STL 파일 모델로부터 유한 요소망 자동 생성)

  • Park, Jung-Min;Kwon, Ki-Youn;Lee, Byung-Chai;Chae, Soo-Won
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.7 s.262
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    • pp.739-746
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    • 2007
  • Recently, models in STL files are widely used in reverse engineering processes, CAD systems and analysis systems. However the models have poor geometric quality and include only triangles, so the models are not suitable for the finite element analysis. This paper presents a general method that generates finite element mesh from STL file models. Given triangular meshes, the method estimates triangles and makes clusters which consist of triangles. The clusters are merged by some geometric indices. After merging clusters, the method applies plane meshing algorithm, based on domain decomposition method, to each cluster and then the result plane mesh is projected into the original triangular set. Because the algorithm uses general methods to generate plane mesh, we can obtain both tri and quad meshes unlike previous researches. Some mechanical part models are used to show the validity of the proposed method.

A Study on Feature Division using Sliced Information of STL Format (STL 포맷의 단면정보를 이용한 형상분할에 관한 연구)

  • Ban, Gab-Su
    • Journal of the Korean Society of Industry Convergence
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    • v.5 no.2
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    • pp.141-146
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    • 2002
  • Stereolithography is the best known as rapid prototyping system. It uses the STL format data which is generated from CAD system. In this study, One of the main function of this developed CAM system deals with shape modification which divide a shape into two parts or more. The cross section of a STL part by a z-level is composed with nested or single polygonal closed loop. In order to make RP product, closed loops must fill with triangular facets from SSET and recover sliced triangular facets which is located normal direction to the cross sectional plane. The system is development by using Visuall C++ compiler in the environment of pentium PC. Operating system is Windows NT workstaion from Micro-Soft.

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Triangle Based Geometric modeling for rapid Prototyping CAM system (고속시작 시스템을 위한 삼각형 기반 형상모델링)

  • 채희창
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.587-591
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    • 1996
  • Usually triangular patches are used to transfer geometric shape in Rpaid Prototyping CAM system. STL, a list of triangles, is de facto in RP industry. Because STL has no topology data, it can cause errornous results. So, STL should be verified before using. After adding support structures to anchor the part to the platform and to prevent sagging or distortion, slicing and layer by layer manufacturing process are done. But triangular patch is surface model and cannot provide dufficient information on geometry in the above processes. So, geometric modeling is necessary in verifying STL, adding support structures, and slicing. It is natural that triangle based modeling is the best when traingular patches are used as input. Considering support structures, solid and faces coexist in RP process. Therefore non-manifold modeler is required. In this study, triangle based non-manifold geometric modeling is proposed for RP system consitent with STL input.

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A study on conversion of cross-sectional information form STL file for Stereolithography (Stereolithography를 위한 STL파일로부터 단면정보 변환에 관한 연구)

  • 최홍태;김준안;이석희;백인환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.445-450
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    • 1995
  • This paper deals with conversion from STL file to Slice cross-sectional information for Stereolithography. The STL file consist of three vertices of triangle and normal vectors in order to represent three dimension shape, but It is very difficult to convert STL file intoSlice file directly, because of file size from one Mbyte to tens of Mbytes. So, The system is accomplished data flow such as neutral.dat, .SL1, .SL2, .SL3, and .SLC file. The data processing is as follows: 1. Create a neutral file including common information. 2. Modify STL file within effective scope of SLA. 3. Calculate a point of intersection between plane equation and line equation. 4. Sort z values by increasing order. 5. Search closed loop by method of singlylinked linear list. The system is developed by using Borland C++ 3.1 compiler in the environment of Pentium PC. We get a satisfactory prototype as a result of application about a lot of household electrical appliances.

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Investigation for effect of the specimen location on sound transmission loss measurement (차음성능시험에서 시편설치위치에 대한 실험적 고찰)

  • 김상렬;강현주;김재승;김현실;김봉기
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.05a
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    • pp.1234-1237
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    • 2002
  • When measuring sound transmission loss (STL) in a laboratory, the specimen location in test aperture affects considerably the measuring accuracy through the influence of so-called “tunneling effect” In this paper, for a single panel and a double panel with air cavity, experimental STL evaluations on various specimen locations on test aperture were carried out to explain the phenomenon. It is shown that the difference of STL is more than 2dB especially at the low frequency region and the case of the center-located panel yielded the lower STL than that of flushing with the end of tunnel, which confirms that the tunneling effect plays an important role in STL measurement.

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The Study on the Reduction of Laser Scanning Path Creation Time during Jewellery Pattern Manufacturing (쥬얼리 패턴제작시 주사경로생성시간 단축에 관한 연구)

  • Kim, T.H.;Kim, S.Y.;Park, J.D.;Kim, M.J.;Jeon, E.C.
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.6
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    • pp.440-446
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    • 2006
  • This study relates to the effect of forming time of injection path on the total process. The whole process can be divided into build process of forming path of injection and after treatment process. The total time required for the whole process could be reduced by reducing the forming time of injection path using SLC file to correct the problems of STL file that is the basic file format for high speed molding devices. First of all, I verify the forming time of injection path according to the conditions of STL file during the formation of injection path. And I verify problems using STL file during formation of injection path. And then I tried to solve problems of STL file by comparing between the formation time of injection path and the existing method using SLC files.

Bridging the gap between CAD and CAE using STL files

  • Bianconi, Francesco
    • International Journal of CAD/CAM
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    • v.2 no.1
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    • pp.55-67
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    • 2002
  • In many areas of industry, it is desirable to have fast and reliable systems in order to quickly obtain suitable solid models for computer- aided analyses. Nevertheless it is well known that the data exchange process between CAD modelers and CAE packages can require significative efforts. This paper presents an approach for geometrical data exchange through triangulated boundary models. The proposed framework is founded on the use of STL file specification as neutral format file. This work is principally focused on data exchange among CAD modelers and FEA packages via STL. The proposed approach involves the definition of a topological structure suitable for the STL representation and the development of algorithms for topology and geometry data processing in order to get a solid model suitable for finite element analysis or other computer aided engineering purposes. Different algorithms for model processing are considered and their pros and cons are discussed. As a case study, a prototype modeler which supports an exporting filter for a commercial CAE package has been implemented.

A Study on the Design of STL/TTL Link Radio System GUI Simulator for M/W Band Digital Broadcasting Relay (M/W대역 디지털 방송중계용 STL/TTL 링크 무선전송 시스템 GUI 시뮬레이터 구현에 관한 연구)

  • 이양선;강희조;김윤호
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2004.05b
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    • pp.112-115
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    • 2004
  • 본 논문에서는 M/W 방송중계용 주파수 공유방안에 관한 기초연구로써 디지털 방송중계용 STL/TTL 링크 무선전송 시스템을 모델링하고 다중경로 페이딩 채널 환경에서 시스템 특성 및 성능 분석이 가능한 M/W대 디지털 방송중계용 STL/TTL 링크 무선전송 시스템 시뮬레이터를 GUI 환경으로 구현하였다. 국내 방송 중계용의 경우 디지털화 진행이 추진되고 있는바, 본 연구에서 구현한 디지털 STL/TTL 링크 무선전송 시스템 시뮬레이터를 이용하여 향후 M/W 대역 방송중계용 주파수 재배치를 위한 채널 성능 및 간섭평가를 수행함으로써 국내 방송중계용 표준화에 기초 자료로 활용하고자 한다.

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