• Title/Summary/Keyword: Cad Program

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Assessment of Transfer Center by Facility Design Analysis (설계분석 프로그램을 이용한 환승센터 내부 및 외부 시설물 평가)

  • Lee, Jeong-Yeop;Han, Dong-Hui;Lee, Ju-Yeong;Lee, Yeong-In
    • Journal of Korean Society of Transportation
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    • v.27 no.5
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    • pp.169-177
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    • 2009
  • Establishing a public transportation transfer system that can reduce personal automobile use in the CBD and absorb the demand, thereby reducing congestion, is a necessity. However, the current transfer system and facilities are lacking in intermodal connectivity, require long transfer times, have complex flow patterns, and are lacking in information systems and convenience. The design analysis program of this study is to develop a program that executes computations of design analysis of transfer facilities by utilizing the existing design standards for facilities such as facilities for boarding and alighting, elements for convenience, and pedestrian facilities. Developing an analytical tool through which individual or integrated design analysis can be conducted on the design standards of various facilities is an important study for improving the work accuracy and efficiency of designing an actual transfer center.

Study on the Textile Structural Design using SLS 3D Printing Technology -Focused on Design of Flexible Woven Fabric Structure- (SLS 방식의 3D 프린팅 기술을 활용한 직물구조적인 디자인설계 연구 -유연성 있는 직조구조 직물설계를 중심으로-)

  • Song, HaYoung
    • Journal of Fashion Business
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    • v.23 no.3
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    • pp.67-84
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    • 2019
  • Since the early 2000s, various fashion design products that use 3D printing technology have constantly been introduced to the fashion industry. However, given the nature of 3D printing technology, the flexible characteristics of material of textile fabrics is yet to be achieved. The aim of this study is to develop the optimal design conditions for production of flexible and elastic 3D printing fabric structure based on plain weave, which is the basic structure in fabric weaving using SLS 3D printing technology. As a the result this study aims to utilize appropriate design conditions as basic data for future study of flexible fashion product design such as textile material. Weaving structural design using 3D printing is based on the basic plain weave, and the warp & weft thickness of 4mm, 3mm, 2mm, 1.5mm, 1mm, and 0.7mm as expressed in Rhino 6.0 CAD software program for making a 3D model of size $1800mm{\times}180mm$ each. The completed 3D digital design work was then applied to the EOS SLS Machine through Maker ware, a program for 3D printer output, using polyamide 12 material which has a rigid durability strength, and the final results obtained through bending flexibility tests. In conclusion, when designing the fabric structure design in 3D printing using SLS method through application of polyamide 12 material, the thickness of 1 mm presented the optimal condition in order to design a durable digital textile structure with flexibility and elasticity of the 3D printing result.

Influence of the accuracy of abutment tooth preparation on the marginal adaptation of Co-Cr alloy copings fabricated with a selective laser sintering technology (지대치삭제의정확도가레이져신터링기술로제작된Co-Cr 코핑의변연적합도에미치는영향)

  • Kim, Seo-Rahng;Koak, Jai-Young;Heo, Seong-Joo;Kim, Seong-Kyun;Kim, Myung-Joo
    • The Journal of Korean Academy of Prosthodontics
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    • v.53 no.4
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    • pp.337-344
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    • 2015
  • Purpose: The purpose of present study is to examine the correlation between the accuracy of abutment preparation and the marginal adaptation of metal coping. With this view, this study compared the correlations regard to the three different manufacturing methods of selective laser sintering technique, milling and casting. Materials and methods: Two master models were made in a different way. First model with deep chamfer margin was prepared directly by a general clinician and the second model was designed by 3-D designing software program with the same abutment preparation principle and produced by computer aided manufacturing. 12 Co-Cr alloy copings were produced respectively with three different method; SLS system, CAD/CAM milling and conventional lost wax technique from each master model. The total 72 copings fully sit on the master model were stereoscopically evaluated at 40 points along the entire circumferential margin. Results: Significant differences in the absolute marginal discrepancies of Co- Cr copings from SLS system (P=.0231) and casting method (P<.0001) were shown between hand preparation model and computer designed model. However, no significant difference was found between the two model groups from milling method (P=.9962). Conclusion: Within the limitation of this study, the effect of the accuracy of abutment preparation on the marginal adaptation of Co-Cr coping is statistically significant in SLS system and casting group. The copings produced by SLS system exhibited the lowest marginal discrepancies among all groups, and the marginal gap of this method group was influenced by the accuracy of the abutment preparation.

Development of Expert System for Tower Cranes

  • Kim, Ki-sung;Kang, Dong-gil;Hong, Ki-sup
    • Journal of Ship and Ocean Technology
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    • v.3 no.2
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    • pp.27-48
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    • 1999
  • The paper is concerned with application to develop the expert system, which structural analysis and design process for tower cranes. The system is organized into three groups. One is pre-processor for creating input data files, another is `model former' which combines knowledge-base with inference engine for automatic generating structural analysis models, a third is application group for final analysis checks. In this study, geometric subroutine of `model former' designates node positions, nodes, elements numbers and element types. Load data subroutine computes weight of tower crane and device, slewing force, cargo load, wind force form rules or equations in knowledge-base. Also, Property and boundary subroutine applies element properties and boundary conditions to suitable elements and nodes. Design and analysis expert system for tower crane integrates these subroutine, `model former' and pre-processor. RBR(Rule-Base Reasoning) was adopted for a reasoning strategy of this expert system. And this expert system can produce structural analysis model and data, which can be used in ordinary structural analysis program (SAP, ADINA or NASTRAN, etc.). In this paper, this expert system produces format of the analysis model data, which are used in MSC/NASTRAN. The main discussions included in the paper are introduction of the tower crane and structural analysis, composition of the design expert system for tower crane and structural analysis using the expert system.

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Development of A Cyber Education Contents for the Ship Outfitting Basic Design (선박 의장 기본 모델링을 위한 사이버 교육 컨텐츠 개발)

  • Kim, Mi-Sun;Park, Yong-Suk;Lee, Sangdon;Seo, Jae-Hyun
    • Journal of Korea Multimedia Society
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    • v.16 no.2
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    • pp.241-253
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    • 2013
  • A Shipbuilding design program used in the shipbuilding industry tends to be shifted from the TRIBON software to the AM(AVEVA MARINE) software these days. Many large domestic shipbuilding companies have been using the AM instead of the TRIBON. New design software requires education programs for the necessary personnel. However the education programs for the AM are largely based on offline education. They suffer from constraints in space and time, and from high costs. This paper describes a development of online contents for the AM software that are focused for cyber education. It covers the applied process and the organization of the contents. The details of the development decisions including the security issue for the contents are described also.

Mathematical modelling of wind turbine blades through volumetric view

  • Vardar, Ali;Eker, Bulent
    • Wind and Structures
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    • v.9 no.6
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    • pp.493-503
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    • 2006
  • The demand for energy in the world increases everyday. Blade energy which is wind turbine is a significant resource which must be appreciated in this field. Especially, in places where wind potential is high, the usage of wind energy is a beneficial factor for every country's economy. In this study, first, 6 different miniature rotor were produced by using 6 different NACA profiles. Rotors were produced with three blades. The electrical performance and the speed of start of action values that are provided from each rotor form were established by measuring them in the wind tunnel. The calculation of area and volumetric values of each profile and wind surfaces were made with AutoCad technical drawing program. As a result, it was searched whether there is any relation between electrical performance values and speed of start of motion that rotors produced and volumetric values of rotors. The aim of this study is to find out whether rotor blade volume is one of factors that influences rotor performance. The general tendency observed here is that the increase in the volume of rotor blade leads to an increase in the speed of start of motion and to a decrease in the rotor performance.

Design of a drying system for a rollover carwash machine using CFD

  • Sabet, Seyyed M.M.;Marques, Jorge;Torres, Rui;Nova, Mario;Nobrega, Joao M.
    • Journal of Computational Design and Engineering
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    • v.3 no.4
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    • pp.398-413
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    • 2016
  • This work describes the design and development of a new drying system for a rollover carwash machine with the support of numerical tools. The drying system is composed of a pair of stationary vertical dryers and a moveable horizontal dryer that can adjust itself to the contour of a vehicle. After the definition of the dryers' concept, their performance was assessed individually to check their internal flow pattern and to improve their airflow distribution. These issues are expected to provide feedback on redesign and geometric optimization of the dryers. After redesign of the dryers separately, the behaviour of the complete drying system was studied on actual vehicle models, representative of the shortest and tallest dimensions that can be washed with the existing carwash machine sector. The drying efficiency of the whole system was studied by calculation of shear stress distribution on various surfaces of a given vehicle. The results allowed concluding that the overall drying performance of the design system is very good and assure adequate drying on most vehicles surfaces. The results obtained from numerical studies were then validated with experimental measurements and a good agreement was found between the two. The procedure employed in this work can be applied to support the design and analysis of other mechanical drying systems.

A Practice of Developing New Environment-friendly System by Composites

  • Kim, Yun-Hae;Yang, Dong-Hun;Jo, Young-Dae;An, Seung-Jun;Park, Se-Ho;Yoon, Sung-Won
    • Journal of Engineering Education Research
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    • v.13 no.5
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    • pp.8-14
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    • 2010
  • This study intends to study about the blade performance loss occurred due to the variation in the shape of an airfoil from attachment/non-attachment of an erosion shield for the hovercraft. The model in this study has used NACA44XXseries, has designed NACA44XX-series by using the Auto CAD, and it designed the shape that has attached an erosion shield to this model according to the thickness and length. By using these models, a grid was generated by GAMBIT and the lift coefficient ($C_l$) and the drag coefficient ($C_d$) were calculated FLUENT code for flow analysis. Through this, the $C_l$ and $C_d$ have calculated and compared the lift-to-drag ratio that an indicator of airfoil performance according to the shape and attachment/non-attachment of erosion shield.

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Computer Aided Design of a Pattern and Risers for Casting Processes(I) (주형의 전산기 원용 설계(I) -목형과 압탕부의 설계-)

  • 박종천;이건우
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.14 no.1
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    • pp.72-78
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    • 1990
  • An interactive computer program has been developed to design a pattern and risers for the production of castings of high quality. In our system, the user models the shape of a final product by using the system's modeling capability, a pattern is generated in a three dimensional model by eliminating the holes and adding shrinkage allowances and drafts, the proper riser is created automatically, and they are united together to yield the three dimensional model of the portion of a mold assembly. The mold can be completed after the runners and the gating systems are designed, modeled, and united, which will be described in part 2 of this work. The unique feature of this work is a realization of an automatic design of the pattern and risers by integrating the modeling capabilities and the design equations used in the real practice.

The Strength Analysis of Passenger Car Seat Frame (승용차 시트프레임의 강도해석)

  • 임종명;장인식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.6
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    • pp.205-212
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    • 2003
  • This paper may provide a basic design data for the safer car seat mechanism and the quality of the material used by finding out the passenger's dynamic behavior when protected by seat belt during collision. A computer simulation with finite element method is used to accomplish this objective. At first, a detailed geometric model of the seat is constructed using CAD program. The formation of a finite element from a geometric data of the seat is carried out using Hyper-Mesh that is the commercial software for mesh generation and post processing. In addition to seat modeling, the finite element model of seat belt and dummy is formed using the same software. Rear impact analysis is accomplished using Pam-Crash with crash pulse. The part of the recliner and right frame is under big stress in rear crash analysis because the acceleration force is exerted on the back of the seat by dummy. The stress condition of the part of the bracket is checked as well because it is considered as an important variable on the seat design. Front impact model which including dummy and seal belt is analyzed. A Part of anchor buckle of seat frame has high stress distribution because of retraction force due to forward motion of dummy at the moment of collision. On the basis of the analysis result, remodeling and reanalysis works had been repeatedly done until a satisfactory result is obtained.