• 제목/요약/키워드: main nut

검색결과 45건 처리시간 0.027초

이중너트가 적용된 풀림방지너트 시스템의 피로안전성 분석 (Analysis of Fatigue Safety for Anti-Loose Nuts System with Dual Nuts)

  • 최정열;김준형;정지승;가상현
    • 한국안전학회지
    • /
    • 제32권4호
    • /
    • pp.22-27
    • /
    • 2017
  • In this study, the authors aim to evaluate a structural and fatigue safety of a new type anti-loose nut system with dual nuts composed of main nut and outer nut to enhance the long-term workability and durability so as to improve the performance of conventional anti-loose nut system. Also, a three-dimensional finite-element method analysis was performed to consider the actual geometry and material property of anti-loose nut system with dual nuts and the effect of static and dynamic loads and loading directions. The analytical results showed that the overall static and dynamic stress of the components of the anti-loose nut system with dual nuts were found to be less than that of the fatigue limit of Goodman-smith diagram and allowable stress of each materials, therefore the anti-loose nut system with dual nuts was sufficient to ensure a structural and fatigue safety.

유한요소해석에 의한 승용차용 플레어 너트 단조공정의 최적설계 (Optimal Design of the Forging Processes of Flare Nut for Automobiles using Finite Element Analysis)

  • 추덕열;한규택
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제28권1호
    • /
    • pp.83-89
    • /
    • 2004
  • Flare nut is an important Part that used to joint a brake tube-end in automobiles. It was made of SWCH 10A by machining. But we studied to make it by metal forming. The main focus of this paper is to investigate an optimal forging processes for flare nut using the DEFORM$^{TM}$-3D. commercially available finite element code and tests. Actually an explicit finite element analysis of the flare nut forging processes has been carried out to predict an optimal shape of the flare nut and its results were reflected in the tests of the forging processes design for flare nut. The simulation results which had obtained from finite element analysis were contributed to the forging processes design for flare nut. An optimal shape of nave nut showed agreements with test results. Furthermore. this paper should contribute to a development of the forging process for a variety of parts.s.

은행종실(銀杏種實)의 지질성분(脂質成分)에 관한 연구(硏究) (Studies on the Lipid Components of Ginkgo Nut)

  • 정안석;신효선
    • 한국식품과학회지
    • /
    • 제10권2호
    • /
    • pp.119-123
    • /
    • 1978
  • 은행의 종실 및 잎중에서 추출 정제한 유지에 대한 지방질의 구성 및 지방산 조성을 분석한 결과를 요약하면 다음과 같다. 1) 신선한 종실 및 잎중의 정제한 총지방질의 함량은 각각 1.32% 및 2.24%였다. 2) 종실중의 총지방질중에는 중성지질이 약 89%, 복합지질이 약 10% 함유되어 있는데 반하여 잎중에는 중성지질이 약 28%, 복합지질이 약 72% 함유되어 있었다. 3) 종실중의 중성지질의 구성분은 다른 식물성 유지와 같이 triglyceride가 주성분으로 약 86%함유되어 있었으며, esterified sterol이 약 9%로 그 다음으로 많았다. 그러나 잎중에는 esterified sterol이 약 53%로 가장 많았고 triglyceride는 약 18%에 불과하였다. 4) 종실중의 총지방질의 주요한 구성지방산은 oleic acid(37.5%) 및 linolenic aicd(44.5%)이고, 잎의 주요 지방산은 linoleic acid(45.2%) 및 palmitic acid(25.1%)였다. 또 종실과 잎중의 중성지질을 구성하는 지방산 조성은 서로 비슷하고, oleic, linoleic 및 palmitic acid가 주요 지방산이었다. 그리고 당지질을 구성하는 지방산조성은 종실에는 oleic 및 linoleic acid의 함량이 잎보다 많은데 비하여 linolenic acid의 함량은 잎이 종실보다 훨씬 많았다. 인지질을 구성하는 지방산조성은 종실과 잎이 모두 당지질과 비슷한 경향이었다.

  • PDF

호도나무 교잡종의 과실특성 (Nut Characteristics of Walnut Hybrids (Juglans spp.))

  • 이욱;이문호;황석인;변광옥
    • 한국자원식물학회지
    • /
    • 제20권1호
    • /
    • pp.63-68
    • /
    • 2007
  • 본 연구는 호도나무 교잡종 과실의 양적 및 질적형질의 특성을 조사하였으며 입중 및 인중, 인중비 등 과실의 주요형질에 의한 품질이 우수한 개체를 선발하여 신품종을 육성하는데 필요한 기초자료로 활용하는 데 그 목적이 있다. 입중이 13g 이상이고 인중비가 50%이상의 양적형질의 선발기준에 의해 산성4호${\times}$Concord 8번 개체 등 4개체가 우량개체로 가장 유망시 되었다. 특히 봉합선 폭은 인중비가 높은 우량과실 및 개체를 선별할 수 있는 중요한 요인임을 확인할 수 있었으며 인중과 입중이 무거울수록 인의 길이가 긴 것으로 조사되었다. 격막의 두께는 두꺼울수록 인의 분리가 어려운 것으로 나타나 인의 분리용이도에 영향을 미치는 것으로 조사되었다. 질적형질은 개체 및 교배조합간 차이가 있는 것으로 조사되었으며 모든 형질에 대하여 동일개체 내에서 다양한 특성이 동시에 관찰되었다.

밤나무 주요 재배지역의 생산비 분석 (Survey of Costs for Chestnut Production in Main Cultivation Regions)

  • 김재성;이욱
    • 한국산림과학회지
    • /
    • 제98권4호
    • /
    • pp.504-511
    • /
    • 2009
  • 본 연구는 밤나무 재배의 생산비를 파악하기 위해 밤나무 재배농가 227농가를 대상으로 조사하였으며 분석 결과는 다음과 같다. 국내 밤나무 재배 전업농가는 평균 5.5 ha의 면적을 재배하고 있었으며, ha당 1.6톤의 밤을 생산하고 있었다. 밤의 판매는 농협과 수집상에 73%이상을 판매하고 있었으며, 품등별 생산비중은 특대립과실 18%, 대립과실 49%, 중립과실 25%, 소립과실 8%로 나타났다. 밤 재배농가의 연간 조수입은 지역마다 상당한 차이를 나타내고 있었으나 전체 평균으로 볼 때, ha당 2,103천원의 조수입을 얻어 경영비로 66.4%를 지출하고 706천원의 농가소득을 올려 33.6%의 소득률을 나타내었다. 지역별 생산비 특성을 보면, 충남지역은 저수고 재배와 노동집약형 재배를 통해 품등이 높은 밤을 생산하여 ha당 평균 2,161천원의 높은 소득을 올렸으나 전남과 경남지역에서는 밤나무 노령화의 영향으로 경영비 투입비중이 낮아 생산성이 크게 떨어지는 특성을 나타냈다.

Design, Manufacture and Testing of the Hydraulic Coconut Dehusking Machine

  • Kwangwaropas, Nongkol
    • 한국농업기계학회:학술대회논문집
    • /
    • 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
    • /
    • pp.648-655
    • /
    • 1993
  • The hydraulic coconut dehusking machine consists of three main parts ie. The frame , the power unit including the hydraulic accessories, the lifting and dehusking mechanisms. Two sets of the hydraulic coconut dehusking machine were developed . their hydraulic and electrical control circuits were connected in series to enable them operating contemporaneously. Two operators are required to operate the machine. Each of them put a coconut on the lifting mechanism in order to start the working cycle automatically. As a result, the nut are immediately pushed up and seized by the holding teeth under the supplement of the hydraulic reducing circuit. After that the dehusking mechanism started operating via the sequence circuit. At the end of the cycle, both mechanisms return to their original positions. Some remaining fibrous is taken out manually from the nut subsequently . The continuous dehusking speed was found to be 22.2 seconds per 2 coconuts.

  • PDF

커피의 원두와 배전두의 지방산조성에 관한 비교연구 (Comparative studies on the fatty acids in the green and roasted coffee beans)

  • 고영수
    • 대한가정학회지
    • /
    • 제24권3호
    • /
    • pp.119-127
    • /
    • 1986
  • To investigate differences in fatty acid composition in green coffee beans and roasted coffee beans, the extracts of two beans were subjected to analysis of fatty acid composition by GC and HPLC. The results showed that palmitic and liolneic acid were the main fatty acids of coffee oil and their contents were about 40%. Minor components, such as capric acid, lauric acid and myristic acid were detected in both samples by GC, but nut HPLC.

  • PDF

와이어 본딩용 압전 액츄에이터의 진동 특성 (Vibration Characteristics of a Wire-Bonding Piezoelectric Actuator)

  • 김영우;김경업;이승엽
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2007년도 추계학술대회논문집
    • /
    • pp.578-582
    • /
    • 2007
  • In this paper, vibration modes and frequencies of a ring-type stacked piezoelectric actuator for a wire bonding transducer system are analyzed using FEM simulations. We implement experiments using a commercial product model of the actuator PZT module which consists of 6 layer ring-type PZT and 7 electrodes, combined bolts, nut and tinut. There are two main results: One is that FEM analysis should consider the effect the harmonic voltage input in order to meet the experimental results. The other is that the current wire bonder using exciting frequency of 136 kHz should be modified in order to improve the actuator and bonding performance because the actuator module has the main longitudinal mode of 145 kHz.

  • PDF

심층면접을 통한 충북지역 종가(宗家) 음식문화 특성 연구 (Specialized Research on Food Culture of Main Family in Chung-Buk through In-Depth Interview)

  • 김미혜;한정인;정혜경
    • 동아시아식생활학회지
    • /
    • 제25권4호
    • /
    • pp.574-593
    • /
    • 2015
  • This research's main objective was to analyze the special qualities of food culture of the Main Family in Chung-Buk through a case study on the diversified types of meals that the Main Family cooked, such as courtesy food, normal food, and seasonal food. The research identifies traditional ingredients of specialties from Chung-Buk through old literature. According to "Sejongsillokjiriji", there are a myriad of ingredients:, including jujube, ginseng, pine mushroom, manna lichen, persimmon, mandarin fish, crab, sweetfish, lacquer, honey, and terrapin, which represent Chung-Buk's unique ingredients. Another reliable source, "Banchandungsok", does not provide a detailed list of traditional foods, but rather a simple list. The majority of food from Chung-Buk, in "Banchandungsok", consist of side dishes like kimchi and salt greens. Eventually, salt greens became diversified. As Chung-Buk is a landlocked province, people often used dried pollack. Kimchi and raw coaker were frequently used as well, and rice cakes encompassed multiple ingredients such as: jujube, mushroom, pine nut, and, dried persimmon. There were distinct differences in the diversity of food and amount of dishes used by the Main Families of Chung-Buk dependent on the ingredients and wealth of each Main Family. Chung-Buk has a landscape full of mountains, so potatoes were abundant and used to make potato Dasik. When cooking process was completed, people placed kelp on to the finished product. Seasonal foods were considered very important, especially on special occasions such as Backjoong, which was a day dedicated to laborers. These foodsprovided a good opportunity for the community to build stronger bonds by sharing rice cake and Yukgaejang with other members of the community. It is apparent that "Jeobbingac" culture, or guest culture, flourished since people in Chung-Buk are traditionally taught to leave spare food for the guest at all times.

Betel Quid Chewing and Upper Aerodigestive Tract Cancers: A Prospective Cohort Study in Khon Kaen, Thailand

  • Kampangsri, Wilas;Vatanasapt, Patravoot;Kamsa-ard, Siriporn;Suwanrungruang, Krittika;Promthet, Supannee
    • Asian Pacific Journal of Cancer Prevention
    • /
    • 제14권7호
    • /
    • pp.4335-4338
    • /
    • 2013
  • Background: This study aimed to determine the association between betel quid chewing and the occurrence of upper aerodigestive tract (UADT) cancers. Methods: A cohort of 17,388 subjects, recruited and interviewed over the 1990-2001 period, in Khon Kaen, Thailand, was followed up until 2011. The data were linked to the Khon Kaen Population-Based Cancer Registry. Results: The prevalence of betel quid chewing was 15.9%, with a female predominance (97.7%); the mean age of chewers was 57.7 years (SD 6.6). The overall incidence of UADT cancers from the cohort was 14.7 per 100,000 person-years, whereas the incidence among the chewers was 45.7. Betel nut chewing was the only major risk factor for UADT cancers in this population (HR=5.26, 95%CI=2.51-11.0), while weak associations were found for tobacco smoking and alcohol (HR=1.16, 95%CI=0.45-3.01 and 1.47, 95%CI=0.72-3.03 respectively). Conclusions: We found betel quid chewing to be a main risk factor for UADT cancers, resulting in a higher incidence in females. However, further study is required to explore the potential risk factors among non-chewers, non-smokers, and non-drinkers.