• Title/Summary/Keyword: door frame

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Set-Based Multi-objective Design Optimization at the Early Phase of Design (The Fourth Report) : Application to Integrated CAD and CAE System (초기 설계단계에서의 셋 베이스 다목적 설계 최적화(제4보) : CAD와 CAE의 통합 시스템에의 적용)

  • Nahm, Yoon-Eui;Inoue, Masato;Ishikawa, Haruo
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.35 no.1
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    • pp.181-187
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    • 2012
  • Various computer-based simulation tools such as 3D-CAD and CAE systems are widely used to design automotive body structure at the early phase of design. Designers must search the optimal solution that satisfies a number of performance requirements by using their tools and a trial-and-error approach. In the previous three reports, a set-based design approach has been proposed for achieving design flexibility and robustness while capturing designer's preference, and its effectiveness has been illustrated with a simple side-door impact beam design problem and real vehicle side-door structure design. This report presents the development of integrated 3D-CAD and CAE system, and the applicability of our proposal for obtaining the multi-objective satisfactory design solutions by applying to an automotive front-side frame.

Analysis of Airtightness and Air Leakage of Wooden Houses in Korea

  • Kim, Sejong;Chang, Yoon-Seong;Park, Joo-Saeng;Shim, Kug-Bo
    • Journal of the Korean Wood Science and Technology
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    • v.45 no.6
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    • pp.828-835
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    • 2017
  • Airtightness of buildings is one of critical aspects of its energy performance. To build up references of airtightness of wooden houses built in Korea, blower door tests have been carried out in 42 houses since 2006. Causes of air leakage were investigated recently. The average value of air change rate was $3.7h^{-1}$ for light frame house and $5.5h^{-1}$ for post-beam construction at ACH50 (air change per hour at 50 Pa air pressure difference). Foam type insulation was more advantageous in ensuring building airtightness than glass fiber batt. Airtightness of wooden houses which were constructed after 2010 was improved to have less than $1.5h^{-1}$ of ACH50, threshold for application of artificial air change. The average air change rate of CLT (cross laminated timber) houses showed the lowest value, $1.1h^{-1}$, among the tested structures.

An Assessment Study of Seismic Resistance of Two-story Wood-frame Housing by Shaking Table Tests

  • Ni, Chun;Kim, Sang-Yeon;Chen, Haijiang;Lu, Xilin
    • Land and Housing Review
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    • v.3 no.1
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    • pp.79-82
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    • 2012
  • While there exists a relatively large body of technical information for the engineered design of wood-frame buildings to resist seismic ground motions, the quantitative assessment of seismic resistance of conventional houses built by prescriptive requirements is less well understood. Forintek Canada Corp., in collaboration with other research and industry partners, has embarked on a research project to address this topic. This paper will report on the seismic shake table tests of a full-scale wood-frame building. The two-story specimen, $6m{\times}6m$ in plan, was built on the seismic shake table at Tongji University in Shanghai, China, according to Part 9 of the 1995 National Building Code of Canada and shaken uni-directionally in each of the two principal directions. Three different seismic table motions were applied at increasing peak ground motion amplitudes up to 0.40 and 0.50 g. The specimen was repaired after the above sets of seismic table motions, and successive runs were conducted for increased door openings. Measurements included specimen accelerations, displacements and anchorage forces. Static stiffness of the specimen was measured at low force levels, and natural frequencies were measured after each seismic loading stage by applying low-level random excitation. The results presented consist of the capacity spectra of the shake table tests, changes in specimen stiffness and natural frequencies with increasing seismic loading. These results and those from other recent shake table tests elsewhere will be compared with simplified engineering calculations based on codified values of strength, and on that basis preliminary conclusions will be drawn on the adequacy of the current code provisions and design guides in Canada and the USA for conventional wood-frame construction.

Implementation of an Indoor Mobile Robot and Environment Recognition using Line Histogram Method (실내 자율주행 로봇의 구현 및 라인 히스토그램을 이용한 환경인식)

  • Moon, Chan-Woo;Lee, Young-Dae
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.9 no.2
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    • pp.45-50
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    • 2009
  • The environment exploration is an essential process for indoor robots such as clean robot and security robot. Apartment house and office building has common frame structure, but internal arrangement of each room may be slightly different. So, it is more convenient to use a common frame map than to build a new map at every time the arrangement is changed. In this case, it is important to recognize invariant features such as wall, door and window. In this paper, an indoor mobile robot is implemented, and by using the laser scanner data and line segment histogram with respect to segment orientation and distance, an environment exploration method is presented and tested. This robot is fitted with a laser scanner, gyro sensor, ultra sonic sensor and IR sensor, and programed with C language.

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A study on reducing deformation of a wide-thin product manufactured by injection molding (사출 성형 공정에서 wide-thin 제품의 변형 감소를 위한 연구)

  • Kim, Jae-Min;Moon, Hyoung-Jun;Sim, Kil-Bo;Lee, Sang-Kyo;Cho, Chong-Du
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.186-191
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    • 2008
  • Injection molding is used to manufacture various kinds of products including very thin plate like frames. One such product is Door video phone system Panel which is our present object of investigation. During the molding process, large deflection problems in the final product always provokes for the several trials for the accuracy. To solve the issue we use Moldflow6.2 which is injection molding simulation software. It simulates the product exactly the way it happens in actual manufacturing environment. Differences in the geometrical parameters such as thickness changes will lead to the large deformation problems in the frame. However in our present study we simulate it in a well defined condition under several trials. Interesting observations are made in minimizing the deformation of the frame during the injection molding process. This way of approach is very useful in further works if any changes have to be made in the product.

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Vibration Test Result and Consideration for AUTS(Advanced Urban Transit System (차세대전동차 진동시험 결과 및 고찰)

  • Hong, Jai-Sung;Kim, Gil-Dong;Lee, Chang-Mu;Won, Jong-Un;Lee, An-Ho;Sung, Chang-Won
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.2276-2279
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    • 2011
  • The AUTS(Advanced Urban Transit System) are developed by government R&D business. This units are under main line performance test in Daebul test line. Both AC and DC could apply to the AUTS for pantagraph voltage. So main transformer and some high voltage filters are added to the under-frame. As a result the total weight of each car(Mc1-Tp1-M-T-Tp2-Mc2) is different. And axle load is different each other. The main characteristics of AUTS(Advanced Urban Transit System) are as follows. One inverter control one motor, DDM(Dircet Drive Motor), no driving gear, plug no end door, self-steering bogie etc. These matters could be appeared to strange vibration. So vibration test is important. The vibration test performed to Mc1 and Tp1. The results were checked to the up-down direction and left-right direction for acceleration.

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A Study on the Wall Components of Sarang-taechong in the Upper Class houses of Chosun Dynasty (조선시대 상류주택 사랑대청의 실내입면구성요소에 관한 연구)

  • 오혜경;홍이경
    • Journal of Families and Better Life
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    • v.18 no.2
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    • pp.191-202
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    • 2000
  • The purpose of this study was to clarify the wall components of Sarang-taechong in the upper class houses of Chosun dynasty. Physical trace method was used for this study. The samples were taken from the Sarang-taechong of 6 traditional Korean houses; Yunkyungdang, the ancient Chusa estate, Sunkyojang, Chunghyodang, Yangjindant, Unjorn. The makor findings were summarized as follows; 1) The common components of each wall were pillars, sanginbangs(upper horizontal beams), hainbangs (lower horizontal beams), door and windows. Changbangs(wood eave pieces that suported decoration blocks), changyos(a pice of wood fitted between the tops of pillars and upper tori cross beams), and morums(the top wainscot board laid horizontally between the bottom beam and the bottom portion of a window frame) were additional. 2) The composition of every south wall was symmetrical and the other threes were mixed symmetrical and asymmetrical. 3) The image of wall was classified-fine, strong, and modera e, according to the symmetry or asymmetry of wall composition, the width of each components, the kind of window.

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Study on the Basic Properties of Platanus occidentalis L. for Its End-use Development (양버즘나무의 용도개발(用途開發)을 위(爲)한 기초재질시험(基礎材質試驗))

  • Lim, Kie-Pyo;So, Won-Tek
    • Journal of the Korean Wood Science and Technology
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    • v.18 no.2
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    • pp.8-15
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    • 1990
  • This study was carried out to investigate the wood qualities for the end-use development of sycamore (Platanus occidentalis L.) grown in Korea. The results obtained were as follows: 1. The average length of wood fibers was l.56mm and the average width of annual rings was 9.5mm. It had very fast growth rate. 2. The specific gravity in air-dry was 0.66. The shrinkage and water absorption were relatively large. The shear and impact strengthes were very strong, while the compressive, tensile, and bending strengthes were weak in comparison to it's specific gravity. 3. The contents of ash, holocellulose, lignin were relatively high 0.74%, 83.08%, 28.79%, but that of pentosan was low 18.53%. 4. The expected uses of sycamore wood are plywood. fancy veneer, small furniture, musical instrument, door and window frame, tool handels, boxes, etc.

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Non-linear Analysis for a Weatherstrip of a Vehicle Door with FE Modeling (자동차 도어 웨더스트립의 유한요소 모델링 및 해석)

  • 김광훈;문병영;김병수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.38-41
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    • 2004
  • Weatherstrip seals protect passengers form noise, dust, rain and wind out of the vehicle. The more contact area between a body frame and a weatherstrip, the higher efficiency of sealing. A weatherstrip is a sort of an elastomer. Mechanical properties of the weatherstrip is obtained by uniaxial tension test. In this study, nonlinear finite element(FE) analysis is performed to obtain displacements and contact shapes of the weatherstrip. The FE model is developed by using Ogden-foam formulation. In the results of nonlinear FE analysis, the most valuable deformation of the weatherstrip occurred when displacement control value reaches 7.2mm. Severe deformation is observed as the displacement control value become more increased.

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Navigation control for a mobile robot using a camera (카메라를 이용한 이동 로보트 주행 제어)

  • 문순환;한민홍
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 1994.04a
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    • pp.42-48
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    • 1994
  • This paper presents the navigation method for a mobile robot which uses a single camera and fluorescent lamp as a guide mark, projected on a convex mirror. The current position and heading direction of the mobile robot are obtained from the image of the guide mark. While the mobile robot travels to a goal position, the current position and heading direction of the mobile robot are updated continuously and the desired path and actual moving path are displayed on the monitor screen in real time. This proposed method eliminates the need to rotate the camera to track the guide mark, since a panoramic view of the surrounding area is available from the convex mirror, and natural guide marks such as usual florescent lamp on the ceiling or door frame can be used for navigation.