• Title/Summary/Keyword: parametric modeling

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A Parametric Modeling Methodology Optimized for Korean Traditional House (한옥의 조형원리를 반영한 파라메트릭 모델링 방법론)

  • Kim, Jeong-Hyun;Jang, Pil-Gu;Jeon, Bong-Hee
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.28 no.2
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    • pp.105-112
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    • 2012
  • Recently, Han-ok is being reconsidered as a type of desirable housing. In order to modernize Han-ok, it is necessary to manage building informations with an organized system based on a data handling technology, such as BIM. Three dimensional Object-based parametric modeling technology enables to model irregular and atypical geometries of Han-ok in a very efficient way. With parametric modeling technology, architects can control the dimension of the digital model of their building through parameter which is mathematically variable. In parametric model, the dimensions of each parts of a building are not only defined as parameters, but also the relations among them are defined as functions. Architects can change their design with less effort and cost by the support of automatic calculation. Therefore, the purpose of this study is to devise a parametric modeling methodology which is optimized to the principle of Han-ok.

Non-parametric Modeling of Cutter Swept Surfaces for Cutting Simulation (모의가공을 위한 공구 이동 궤적면의 비매개변수형 모델링)

  • 정연찬;최병규
    • Korean Journal of Computational Design and Engineering
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    • v.1 no.1
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    • pp.45-55
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    • 1996
  • This paper presents a new approach to non-parametric modeling of cutter swept surface (CSS) for cutting simulation. Instead of explicitly modeling cutter swept volumes, silhouette curves of the cutter surface are utilized in computing the z-value of the CSS at a grid point on the x,y-plane. The non-parametric evaluation of the CSS constitutes the integral part of 3-axis cutting simulation. The proposed method is more efficient than the existing ones in the case of conventional cutters (i.e., ball-end mills and flat-end mills), and more importantly, it enables the non-parametric modeling of the CSS for the round-end mills which was not possible with the existing methods.

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Development of a Parametric Design System for Membrane Structures (연성 막구조의 파라메트릭 설계 시스템 개발)

  • Choi, Hyun-chul;Lee, Si Eun;Kim, Chee Kyeong
    • Journal of Korean Association for Spatial Structures
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    • v.16 no.4
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    • pp.29-36
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    • 2016
  • The objective of this research is to development of a parametric design system for membrane structures. The parametric design platform for the spatial structures has been designed and implemented. Rhino3D is used as a 3D graphic kernel and Grasshopper is introduced as a parametric modeling engine. Modeling components such as structural members, loading conditions, and support conditions are developed for structural modeling of the spatial structures. The interface module with commercial structural analysis programs is implemented. An iterative generation algorithm for design alternatives is a part of the design platform. This paper also proposes a design approach for the parametric design of Spoke Wheel membrane structures. A parametric modeling component is designed and implemented. SOFiSTik is examined to interact with the design platform as the structural analysis module. The application of the developed interface is to design optimally Spoke Wheel Shaped Ductile Membrane Structure using parametric design. It is possible to obtain objective shape by controlling the parameter using a parametric modeling designed for shape finding of spoke wheel shaped ductile membrane structure. Recently, looking at the present Construction Trends, It has increased the demand of the large spatial structure. But, It requires a lot of time for Modeling design and the Structural analysis. Finally an optimization process for membrane structures is proposed.

Development of a Physics-Based Design Framework for Aircraft Design using Parametric Modeling

  • Hong, Danbi;Park, Kook Jin;Kim, Seung Jo
    • International Journal of Aeronautical and Space Sciences
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    • v.16 no.3
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    • pp.370-379
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    • 2015
  • Handling constantly evolving configurations of aircraft can be inefficient and frustrating to design engineers, especially true in the early design phase when many design parameters are changeable throughout trade-off studies. In this paper, a physics-based design framework using parametric modeling is introduced, which is designated as DIAMOND/AIRCRAFT and developed for structural design of transport aircraft in the conceptual and preliminary design phase. DIAMOND/AIRCRAFT can relieve the burden of labor-intensive and time-consuming configuration changes with powerful parametric modeling techniques that can manipulate ever-changing geometric parameters for external layout of design alternatives. Furthermore, the design framework is capable of generating FE model in an automated fashion based on the internal structural layout, basically a set of design parameters describing the structural members in terms of their physical properties such as location, spacing and quantities. The design framework performs structural sizing using the FE model including both primary and secondary structural levels. This physics-based approach improves the accuracy of weight estimation significantly as compared with empirical methods. In this study, combining a physics-based model with parameter modeling techniques delivers a high-fidelity design framework, remarkably expediting otherwise slow and tedious design process of the early design phase.

A Parametric Modeling Method for Automatic Fitting of Longitudinal Geometry of Box Girder in FCM Bridge (FCM 교량 박스거더의 종방향 형상 자동조정을 위한 파라메트릭 모델링 방법)

  • Lee, Sang-Ho;An, Hyun-Jung;Kim, Bong-Geun;Eom, In-Soo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.23 no.4
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    • pp.417-424
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    • 2010
  • This study proposes a parametric modeling method for efficient preliminary design of FCM(Free Cantilever Method) bridge. The method is capable of automatic fitting of cross section according to variation of span length of box girder which has variational section. Parameters for forming longitudinal geometry of box girder are defined, then implicit and explicit constraints, and functional relations among them are defined by applying statistics of parameters used in FCM bridge designs. The constraints and relations are applied to a sample bridge for verifying applicability of parametric modeling. In addition, material quantity of the sample model generated by parametric modeling is estimated and compared to the quantity of the real designed model to check the accuracy of the automatically designed parametric model.

3D Digital Restoration of Traditional Wooden Building Using Parametric Modeling (Parametric 모델링 방식을 이용한 전통목조건축물의 3D 디지털 복원)

  • Lee, Kang-Hoon;Cho, Sae-Hong
    • Journal of Korea Multimedia Society
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    • v.12 no.8
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    • pp.1164-1171
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    • 2009
  • This paper proposes an efficient implementation way of traditional wooden building using Parametric modeling method which uses the relations of numerical value ratio between building materials. Building structures and order of construction for Geunjungjeon of Kyuungbok Palace is digitally implemented proving the efficiency of the suggested proposal. Although the existing digital modeling methods for traditional wooden building emphasize the exterior modeling of the building, our modeling method constructed numerous wooden materials and arranged those pieces orderly so that people can see the interior structures of the building which usually is beyond one's vision. The suggested Parametric modeling method, Multi-Object Texture Mapping, Physical Camera Restoration, and GI Renderer for implementing Geunjungjeon of Kyuungbok Palace can be practically used for digital implementation for other traditional wooden buildings.

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3D Parametric Modeling of RC Piers and Development of Data Generation Module for a Structural Analysis with 3D Model of RC Piers (RC 교각의 3차원 매개변수 모델링 및 비선형 구조해석 입력 데이터 생성 모듈 구축)

  • Son, You-Jin;Shin, Won-Chul;Lee, Sang-Chul;Lee, Heon-Min;Shin, Hyun-Mock
    • Journal of KIBIM
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    • v.3 no.3
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    • pp.19-28
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    • 2013
  • In Korea highway bridges, most piers are the type of one-column or multi-column ones. So, in this study, under an environment applying BIM so fast, to activate researches on two-column piers subjected to bidirectional seismic loading, a 3D parametric modeling method was selected when the model of two-column piers and one-column piers were formed. Also, interface module between input data in structural analysis and 3D model of RC pier was developed. The module can create the input data for non-linear structural analysis like material, geometric properties and additional coefficients.

An Expert System of Moulding Working for Air Intake Hose Products using 3-Dimensional Parametric Modeling Technique

  • Sang Bong Park
    • Korean Journal of Computational Design and Engineering
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    • v.3 no.3
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    • pp.168-176
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    • 1998
  • This paper deals with an application on the mould machining of air intake hose product by using 3-dimensional parametric modeling techniques. The detailed domain is the 3-dimensional product with similar shapes and different sizes which needs too much working time for preparation of modeling or machining due to making a trial and errors repeatedly. Decision making rules for selection of modeling order and technique, and for calculation of cutting conditions, and for determination of sequence and method concerning machining operations are required by interview of expert engineers in the field. The developed expert system of modeling and machining is programmed by using a user programming language under the CAD/CAM software of the Personal Designer. The developed system that aids a mould engineer who is working in the modeling and machining section which deal with air intake hose product provides strong and useful capabilities.

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Aerodynamic Shape Design Method for Wing Planform Using Metamodel (근사모델을 이용한 날개 평면형상 공력형상설계 방법)

  • Bae, Hyogil;Jeong, Sora
    • Journal of Aerospace System Engineering
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    • v.8 no.4
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    • pp.18-23
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    • 2014
  • In preliminary design phase, the wing geometry of the civil aircraft was determined using the empirical equation and historical data. To make wing geometry more aerodynamically efficient, an aerodynamic shape optimization was conducted. For this purpose the parametric modeling, high fidelity CFD analysis and metamodel-based optimal design technique were adopted. The parametric modeling got the design process to achieve the improvement by generating the configuration outputs easily for the major design variables. The optimal design equations were formularized as the type of the multi-objective functions considering low/high speed and lift/drag coefficient. The optimal solution was explored with the help of the kriging metamodel and the desirability function, therefore the optimal wing planform was sought to be excellent at both low and high speed region. Additionally the optimal wing planform was validated that it was excellent not only at the specific AOA, but also all over the range of AOA.

Parametric Modeling and Shape Optimization of Offshore Structures

  • Birk, Lothar
    • International Journal of CAD/CAM
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    • v.6 no.1
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    • pp.29-40
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    • 2006
  • The paper presents an optimization system which integrates a parametric design tool, 3D diffraction-radiation analysis and hydrodynamic performance assessment based on short and long term wave statistics. Controlled by formal optimization strategies the system is able to design offshore structure hulls with superior seakeeping qualities. The parametric modeling tool enables the designer to specify the geometric characteristics of the design from displacement over principal dimensions down to local shape properties. The computer generates the hull form and passes it on to the hydrodynamic analysis, which computes response amplitude operators (RAOs) for forces and motions. Combining the RAOs with short and long-term wave statistics provides a realistic assessment of the quality of the design. The optimization algorithm changes selected shape parameters in order to minimize forces and motions, thus increasing availability and safety of the system. Constraints ensure that only feasible designs with sufficient stability in operation and survival condition are generated. As an example the optimization study of a semisubmersible is discussed. It illustrates how offshore structures can be optimized for a specific target area of operation.