• 제목/요약/키워드: Tie-down structure

검색결과 13건 처리시간 0.021초

Topology optimization of tie-down structure for transportation of metal cask containing spent nuclear fuel

  • Jeong, Gil-Eon;Choi, Woo-Seok;Cho, Sang Soon
    • Nuclear Engineering and Technology
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    • 제53권7호
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    • pp.2268-2276
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    • 2021
  • Spent nuclear fuel, which can degrade during long-term storage, must be transported intact in normal transport conditions. In this regard, many studies, including those involving Multi-Modal Transportation Test (MMTT) campaigns, have been conducted. In order to transport the spent fuel safely, a tie-down structure for supporting and transporting a cask containing the spent fuel is essential. To ensure its structural integrity, a method for finding an optimum conceptual design for the tie-down structure is presented. An optimized transportation test model of a tie-down structure for the KORAD-21 metal cask is derived based on the proposed optimization approach, and the transportation test model is manufactured by redesigning the optimized model to enable its producibility. The topology optimization approach presented in this paper can be used to obtain optimum conceptual designs of tie-down structures developed in the future.

CoQue - 케이블타이 구조를 이용한 휴대폰 거치대 디자인 (CoQue - Designing New SmartPhone Cradle with Cable Tie Structure)

  • 김신;김소영
    • EDISON SW 활용 경진대회 논문집
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    • 제4회(2015년)
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    • pp.491-495
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    • 2015
  • Currently, selfie stick, a monopod take selfie photographs, got its popularity. Cradle used to connect selfie stick and smartphone usually uses electric force of spring to get smartphone fixed. But, using electric forces makes it hard to attach and detach smartphone from the cradle and gives possibility of smartphone falling down. CoQue suggests new solution of smartphone cradle by using cable tie (patent number US 8407863 B2) instead of electric force. It will give more easy and stable way of using selfie stick.

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설계풍속 상향 조정에 따른 50ton급 컨테이너 크레인의 구조 안정성 평가 (The Analysis of a Structural Stability of a 50ton Container Crane according to an Increased Design Wind velocity)

  • 권순규;이성욱;한동섭;심재준;한근조
    • 한국항해항만학회:학술대회논문집
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    • 한국항해항만학회 2005년도 추계학술대회 논문집
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    • pp.241-246
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    • 2005
  • 본 연구는 컨테이너 크레인이 강풍에 대비하여 크레인을 고정하는 계류 시에 75m/s의 풍하중이 50ton급 컨테이너 크레인에 작용될 때, 풍향변화와 기계실의 위치 변화가 50ton급 컨테이너 크레인의 구조적 안정성에 미치는 영향을 분석하였다.. 본 연구에 적용된 설계 풍하중은 "건축물 하중 기준"에 의거하여 산출하였으며. 풍향은 $0^{\circ}\~180^{\circ}$$15^{\circ}$ 간격으로 적용하여 각 지지점에서의 반력을 분석하였다. 그리고 전체 자중의 $15\%$를 차지하는 기계실의 위치 변화가 컨테이너 크레인의 구조 안정성에 미치는 영향을 분석하였다. 그리고 이 결과들을 바탕으로 컨테이너 크레인의 전도방지장치인 타이다운(Tie-down)의 설계기준을 제시하였다.

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풍속 증가에 따른 풍하중이 컨테이너 크레인의 구조 안정성에 미치는 영향 (Analyzing the effect on a Structural Stability of a Container Crane according to an Increased Wind velocity)

  • 권순규;한근조;한동섭;이성욱
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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    • pp.373-374
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    • 2006
  • This study is carried out to analyze the stability of a container crane in according to the change of a wind direction and a machinery house location when a wind load of a wind velocity, 75m/s was applied on the state stowing a container crane by a heavy wind. A design wind load applied to this study was calculated in observance of 'Load Criteria of Building Structure'. And we analyzed the reactions of each supporting points according to appling a wind direction to an interval of $10^{\circ}\;in\;0^{\circ}{\sim}180^{\circ}$ and the structure stability of a container crane according to changing a machinery house. location occupying 15% of a container crane weight. From a results of this study, we presented a design criteria of an overturning disturbance equipment, tie-down.

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RCB트라이를 이용한 빠른 검색과 소용량 색인 구조에 관한 연구 (A Study on Small-sized Index Structure and Fast Retrieval Method Using The RCB trio)

  • 정규철
    • 한국컴퓨터정보학회논문지
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    • 제12권4호
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    • pp.11-19
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    • 2007
  • 본 논문에서는 CB 트라이와 HCB 트라이의 단점을 보완한 RCB 트라이를 제안한다. 먼저 CB 트라이의 경우 처음으로 축약된 구조를 시도하였으나 데이터의 양이 증가함에 따라 트리의 균형을 맞추기 위해 사용되는 더미노드들로 인해 삽입에 상당한 어려움을 가지고 있다. 반면 계층적으로 표현한 HCB트라이는 map이 오른쪽으로 증가하는 것을 막기 위해 일정 깊이를 주어 깊이에 다다르면 새로운 트리를 만들어 연결시키는 방법을 이용하였다. 결과적으로 입력과 검색 속도를 상당히 빠르게 진전시킬 수 있었으나 CB트라이와 마찬가지로 더미노드를 사용하고 여러 트리의 링크를 사용하기 때문에 저장공간이 커지는 단점을 안고 있다. 본 논문에서 제안한 RCB트라이는 더미노드를 완전히 없애 treemap을 약 35%정도 줄일 수 있었고 HCB트라이에 비해 전체 색인의 크기를 절반으로 줄였다.

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고마찰저항 프리프레그와 저마찰저항 프리프레그의 물리적 및 기계적 특성평가 (Evaluation of the Physical and the Mechanical Properties of the High Frictional Resistance Prepreg and the Low Frictional Resistance Prepreg)

  • 김윤해;한중원;김국진;김재학;손진호
    • 한국마린엔지니어링학회:학술대회논문집
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    • 한국마린엔지니어링학회 2005년도 전기학술대회논문집
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    • pp.326-330
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    • 2005
  • Aircraft composite structure with honeycomb core experiences core crush problem in manufacturing. To prevent core crush additional processes are needed such as core stabilization and prepreg material tie-down and this is the cause of increasing cost. Recent study shows that high friction prepreg prevent core crush without additional process. This paper presents the analysis of high frictional material which attracts lots of interests through physical property, mechanical property and microscopic

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하니컴 코어 붕괴에 영향을 주는 고 마찰 저항 프리프레그의 특성 평가 (The characteristic evaluation of high frictional resistance prepreg influencing honeycomb core crush)

  • 한중원;김국진;김정민;진양준;서정현;김재학
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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    • pp.270-274
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    • 2004
  • Aircraft composite structure with honeycomb core experiences core crush problem in manufacturing. To prevent core crush additional processes are needed such as core stabilization and prepreg material tie-down and this is the cause of increasing cost. Recent study shows that high friction prepreg prevent core crush without additional process. This paper presents the analysis of high frictional material which attracts lots of interests through physical property, mechanical property and microscopic morphology and the cause of friction.

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Structural integrity of KJRR-F fresh nuclear fuel under vehicle-induced vibration for normal transport condition

  • Jeong, Gil-Eon;Yang, Yun-Young;Bang, Kyoung-Sik
    • Nuclear Engineering and Technology
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    • 제54권4호
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    • pp.1355-1362
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    • 2022
  • Nuclear fuel, including its fresh state, must be handled safely due to its critical and hazardous nature. Under normal transport conditions, several interactions take place among different components, such as transport cask used for loading the nuclear fuel and tie-down structure to attach with the vehicle. To ensure structural integrity of the nuclear fuel, vibrations and impacts transmitted from the vehicle must be sufficiently reduced. Therefore, in this study, we conducted two transportation tests from Daejeon to Kijang in Korea to verify the vehicle-induced vibrational characteristics of the KJRR-F fresh nuclear fuel when transported under normal transport conditions. The speed and location of the vehicle were obtained via GPS, and the accelerations between the vehicle and the KJRR-F fresh nuclear fuel were measured. Additionally, using the acceleration results, a structural analysis was conducted to confirm the structural integrity of the nuclear fuel under the most severe conditions during normal transport.

고려(高麗) 금동탑(金銅塔)을 통해 본 법주사(法主寺) 팔상전(捌相殿)의 구조형식계통(構造形式系統) (The Structural Lineage of Palsangjeon in Pubjoo Temple Analyzed through Gilt-bronze Pagoda in the Koryo Period)

  • 김경표
    • 건축역사연구
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    • 제14권1호
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    • pp.89-105
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    • 2005
  • The central aim of this thesis is to see if the structure of Palsangjeon(捌相殿) in Pubjoo Temple(法住寺), a five sto wooden pagoda in Chosen(朝鮮) Dynasty, was handed down from the ancient and middle ages. This study was performed through an analysis of Gilt-Bronze Pagoda built in Koryo(高麗) period. In other words, it is aimed at analyzing which lineage the structure of Palsangjeonbelongs to as a wooden pagoda. In analyzing the structure of Palsangjeon, I attempted to find out its source from the remains of Koryo period prior to the Chosen Dynasty. Examples are the Gilt-Bronze Pagoda, built during the Koryo period. I have also examined its relationship with other existing wooden pagodas and remains. The analysis of Palsangjeon, a five story wooden pagoda in Chosen Dynasty, focuses on the following: First, I explored the possibilities of whether the structure of Palsangjeon was newly invented in Chosen Dynasty, or if it had been derived from the wooden pagodas in the Koryo period. Secondly, I tried to find out if the stable vertical planes, with a great successive diminution ratio, were derived from the middle age, i.e. Koryo period. The results of the study of Palsangjeon through Gilt-Bronze Pagoda analysis are as follows: 1. The structure of Gilt-Bronze Pagoda, a wooden pagoda from the Koryo period, is roughly classified into the accumulation type, using pipe pillars, and the one story type using whole pillars. In the accumulation type, stories are connected in either a flat format or an intervening format. The Gilt-Bronze Pagoda is mainly composed of pipe pillars, with some whole pillars. However, the central pillar was omitted in the building structure. Generally, the upper and lower stories are connected by pipe pillars in a crutch format. All the pillars, whether they are pipe pillars or whole pillars, used Naiten(內轉) technology. The Eave supporter has the Haang type(下昻) and the Muhaang type(無下昻). In most cases, high balustrades are furnished, but few tables of high balustrades have been found. The slanting roof formats have been handed down from Paekche(百濟), Silla(新羅), or Koryo(高麗). However, the structure of the octagon is assumed to be derived from Koguryo(高句麗). The structure of the Gilt-Bronze Pagoda from the Koryo period is mainly composed of accumulated flat squares, with some spire types. intervening format, the structure of Palsangjeon used whole pillars in a half story format in which upper level side pillars are installed on the lower level tie beam. From the Bronze Pagoda from the Koryo period, we can assume that the half story format of wooden pagodas that has stable vertical planes with a great successive diminution ratio was created during the mid-Koryo period at the latest and had been idly developed by the time of the Chosen Dynasty. 3. The whole pillars in Palsangjeon are also found in Gilt-Bronze Pagodas from the Koryo period. Hence, all of the pillars in Palsangjeon seem to have been handed down from the ancient construction technology. They were also used in the construction of wooden pagodas from the Koryo period. Therefore, it is assumed that Palsangjeon was constructed using the construction technology of the Chosen Dynasty that had been developed from the wooden pagoda construction technology of the Koryo period. The stable vertical planes with a great successive diminution ratio in Palsangjeon are derived from ancient Korean wooden pagodas, which have developed into indigenous Korean wooden pagodas with fairly stable vertical planes and a great design, in the half story format of Koryo and Chosen Dynasty. Therefore, it is assumed that the structure of Palsangjeon has a systematic relationship with traditional Korean wooden pagodas and is one of the indigenous Korean wooden pagoda structures. 4. In China, the intervening format has been mainly used between stories in multi-story architecture since the ancient days. At the same time, the flat format as also used in ancient and middle ages. However, the flat format was replaced by whole pillars during the Ming(明) and Manchu(淸) Dynasties, in favor of simple and compact construction. The half-story format, in which upper level side pillars are installed on tie beams, has been found in some cases, but it doesn't seem to have been the primary construction technology. Few traces of the half-story format have been found in multi-story architecture in Japan, and it has not been used as a general construction format. By contrast, the half-story format, which seems to have been derived from the Koryo period, was used as a general construction format in multi-story architecture of the Chosen Dynasty. The construction technology of multi-story architecture is related to that of multi-story wooden pagodas, but they have different production technologies. It seems that the structure of Palsangjeon did not just adopt the construction technology of multi-story architecture in the Chosen Dynasty, but it was developed from wooden pagodas in the Koryo period, including the Gilt-Bronze Pagoda. 5. Since the ancient days, most Chinese and Japanese wooden pagodas have adopted an accumulation type of structure using pipe pillars, with accumulated pointed towers. On the other hand, though most Korean wooden pagodas have also adopted an accumulation type of structure from the ancientdays, one story type using whole pillars was created in the Koryo and Chosen Dynasties. The wooden pagoda structure of Palsangjeon, with stable vertical planes in a half story format, is a unique Korean construction technology, different from the construction technologies of Chinese and Japanese wooden pagodas. This thesis clearly determined the structural characteristics of Palsangjeon. However, various remains have yet to be analyzed in depth, to establish an accurate construction technology system. In the beginning of this thesis, I had difficulty in precisely interpreting the internal structure of the Gilt-Bronze Pagoda from its appearance. However, in the process of study, the more serious problem was that there are few remains or ruins of multi-story architecture in ancient and the middle ages of Korea. Therefore, it is urgent to discover various remains in the future. This thesis succeeded in determining the structural characteristics of Palsangjeon. However, it fell short of clarifying the structural lineage of the stable vertical planes, although they show indigenous Korean architectural taste, representing the unique national emotion, and the construction format of multi-story wooden pagodas in Korea. I hope this is clarified in the future research.

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