• Title/Summary/Keyword: 3-dimensional modeling

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Application of Three-dimensional Scanning, Haptic Modeling, and Printing Technologies for Restoring Damaged Artifacts

  • Jo, Young Hoon;Hong, Seonghyuk
    • Journal of Conservation Science
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    • v.35 no.1
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    • pp.71-80
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    • 2019
  • This study examined the applicability of digital technologies based on three-dimensional(3D) scanning, modeling, and printing to the restoration of damaged artifacts. First, 3D close-range scanning was utilized to make a high-resolution polygon mesh model of a roof-end tile with a missing part, and a 3D virtual restoration of the missing part was conducted using a haptic interface. Furthermore, the virtual restoration model was printed out with a 3D printer using the material extrusion method and a PLA filament. Then, the additive structure of the printed output with a scanning electron microscope was observed and its shape accuracy was analyzed through 3D deviation analysis. It was discovered that the 3D printing output of the missing part has high dimensional accuracy and layer thickness, thus fitting extremely well with the fracture surface of the original roof-end tile. The convergence of digital virtual restoration based on 3D scanning and 3D printing technology has helped in minimizing contact with the artifact and broadening the choice of restoration materials significantly. In the future, if the efficiency of the virtual restoration modeling process is improved and the material stability of the printed output for the purpose of restoration is sufficiently verified, the usability of 3D digital technologies in cultural heritage restoration will increase.

3-D Spatial Data Modeling Software (3차원 공간자료 모델링 소프트웨어 개발)

  • Lee, Doo-Sung;Kim, Hyoun-Gyu
    • Geophysics and Geophysical Exploration
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    • v.5 no.1
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    • pp.1-5
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    • 2002
  • We developed a modeling and visualization software that can analyze 3-dimensional spatial information in the ArcView environment. The software constructs and visualizes an object in 3 dimensional space from the input data given a number of horizontal cross-sections. The software can generate and visualize the cross-sections of the object in any azimuth and inclination. Utilizing the program users can modify the 3-D shape of the object by interactively editing the cross-sections.

A Study on 3D modeling data acquisition method for sculpture scan (조형물 스캔에 대한 3D 모델링데이터 획득 방법연구)

  • Park, Junhong;Lee, Junsang
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2018.05a
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    • pp.612-614
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    • 2018
  • Today, technologies that can acquire modeling data by using image are emerging. That 3D modeling production method, which is frequently utilized in contents industries, creates modeling data by using creator's intuitive sense, with drawings sketched without accurate measurement tools is also true. Recently, technologies that can facilitate modification and amendment of existing design by producing and reorganizing three-dimensional data of a sculpture through combination of image information are developing. This thesis gives suggestion of how to utilize and study the way to produce accurate three-dimensional modeling data by utilizing multiple image data.

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The Safety Assessment of Embankment by Three Dimensional Electrical DC Modeling (3차원 전기비저항 모델링을 통한 제체의 안정성 분석 연구)

  • Oh, Seok-Hoon
    • Journal of the Korean earth science society
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    • v.29 no.6
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    • pp.447-453
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    • 2008
  • Recently, the electrical DC survey has frequently been performed to assess the safety of embankment. This study showed that the damaged section of embankment could be appropriately detected by the survey only when the three dimensional effect was correctly considered. The shape of the three dimensional embankment was numerically implemented, and a proper modeling was performed to confirm the effect by analyzing the apparent and inverted true resistivity. Then, the field work was carried out. The three dimensional interpretation distinguished the erroneous weak zones from the geometrical artifact, and the embankment was ensured as safe both by the additional survey performed in rainy season and the partial excavation for direct observation.

Three Dimensional Induced Polarization Modeling (3차원 IP 탐사의 모형 응답 계산)

  • Nam Myung-Jin;Suh Jung-Hee
    • Geophysics and Geophysical Exploration
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    • v.4 no.1
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    • pp.1-7
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    • 2001
  • The application of geophysical survey methods need to be integrated to meet the increasing demands of imaging of the subsurface in the practical application of civil engineering, underground water survey and environmental problems. This paper examines the IP survey which can be surveyed simultaneously with DC resistivity survey. In this study, 3-D IP modeling algorithm was developed. The 3-D IP modeling algorithm was based on 3-D resistivity modeling by finite-element method. The result of 3-D modeling was compared with 2-dimensional modeling result. The result showed that the 3-D modeling algorithm developed in this study was accurate. Finally, the 3-D modeling algorithm developed in this paper will be useful for the study of IP data.

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A Study on the Preprocessing for Finite Element Analysis of 3-Dimensional Structures.(With Focus on Geometric Modelling) (3차원 구조물의 유한요소해석 전처리에 관한 연구(기하학적 모델링을 중심으로))

  • 이재영;이진휴;한상기
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1990.10a
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    • pp.40-46
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    • 1990
  • This paper introduces a geometric modelling system adopted in a newly developed preprocessor for finite element analysis of three dimensional structures. The formulation is characterized by hierarchical construction of structural model which consists of control points, curves, surfaces and solids. Various surface and solid modeling schemes based on blending functions and boundary representation are systematized for finite element mesh generation. The modeling system is integrated with model synthesis and operations which facilitate modelling of complex structures.

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A Study on the modeling of roller gear cam (롤러기어캠의 모델링에 관한 연구)

  • 조승래;이춘만;정원지
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.3
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    • pp.31-37
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    • 2001
  • In this paper, we developed an automated program for the modeling and simulation of three-dimensional roller gear cam mechanisms. The three-dimensional modeling for a roller-gear cam employs coordinate transformations based on the con-tact condition. the wire frame modeling followed by the shading technique using triangular meshing elements incorporat-ed the to reduce the number of data and computational load. Computer simulations for two kinds of products for rollger-gear cam mechansim illustrate the relative motion between the modeled roller-gear cam and a turret and thus show the effectiveness of the proposed modeling.

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Analysis of Elementary Students Modeling Using the Globe on the Cause of Seasonal Change (초등학생의 계절 변화 원인에 관한 지구본 활용 모델링 분석)

  • Suk, Yun Su;Yoon, Hye-Gyoung
    • Journal of Korean Elementary Science Education
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    • v.41 no.4
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    • pp.673-689
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    • 2022
  • To understand seasonal changes it is necessary to understand the relationship between celestial bodies in a three-dimensional space, and to this end, modeling activities in which students directly construct, use, evaluate, and modify three-dimensional models are important. In this study, the process of elementary school students using globes and light bulbs to model Earth's motion in a three-dimensional space as a cause of seasonal changes was analyzed. Seventeen sixth graders participated in the modeling process. After exploring phenomena and concepts related to seasonal change, students constructed models using globes and bulbs and used them to explain seasonal changes. Video data recording students' modeling process, students' activity sheets, and transcripts of post-interview were used as research data, and data triangulation was conducted. The modeling level analysis framework was also developed based on previous studies. In particular, the framework was developed in detail in this study in consideration of the concept of Earth's motion as well as understanding model and implementing modeling. In the final analysis framework, the 3D modeling level was classified from level 1 to level 3, and student performance that may appear at each level was specified. As a result of the study, there were two main levels of modeling using globes for elementary school students to explain seasonal changes. The rotation and tilt of the axis of rotation and revolution of the earth were considered but the level at which empirical evidence was not used (level 2), the level at which empirical evidence was used to explain seasonal chages (level 3). However, even when students use empirical evidence, it did not lead to the construction of a scientific model. In this study, the cause was explored in relation to the characteristics of the tool used for modeling.

Modeling Method for the Force and Deformation Curve of Energy Absorbing Structures to Consider Initial Collapse Behaviour in Train Crash (열차 충돌에너지 흡수구조의 초기붕괴특성을 고려하기 위한 하중-변형 곡선 모델링 방법)

  • Kim, Joon-Wo;Koo, Jeong-Seo;Lim, Jong-Soon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.3
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    • pp.116-126
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    • 2010
  • The Korean rolling stock safety regulation stipulates that the collision deceleration of a car body should be maintained under average 5g and maximum 7.5g during train collisions. One-dimensional dynamic model of a full rake train, which is made up of nonlinear springs/bars-dampers-masses, is often used to estimate the collision decelerations of car bodies in a basic design stage. By the way, the previous studies have often used some average force-deformation curve for energy absorbing structures in rolling stock. Through this study, we intended to analyse how much the collision deceleration levels are influenced by the initial peak force modeling in the one-dimensional force-deformation curve. The numerical results of the one-dimensional dynamic model for the Korean High-Speed Train show that the initial peak force modeling gives significant effect on the collision deceleration levels. Therefore the peak force modeling of the force-deformation curve should be considered in one-dimensional dynamic model of a full rake train to evaluate the article 16 of the domestic rolling stock safety regulations.

Analysis and Dynamic Modeling of a High-speed Tube Expander (고속 Tube Expander의 동적 모델링 및 해석)

  • 김재량;정원지;김수태;최욱환
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.10a
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    • pp.401-411
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    • 2003
  • Tube expanding process is for combining a heat-sink plate with hair-pins (Cu-tube) through plastic deformation. The two parts, i. e. , heat-sink plate and hair-pins are they components of a heat-exchanger for an air conditioner. This paper presents the analysis and dynamic modeling of a high-speed tube expander which integrates transfer of parts, fixing of parts, and tube expanding into one process. The 3-dimensional modeling of all the parts for the tube-expander was constructed using CATIA$\circledR$. then the CATIA$\circledR$ models are transferred into visuaINastran$\circledR$ to execute the 3-dimensional animation for checking prescribed cycle-time. The technique presented in this paper has been shown to be effective as a priori tool for verifying the design of a high-speed tube expander.

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