• 제목/요약/키워드: Combine operation

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A SURVEY ON THE UTILIZATION OF AGRICULTURAL MACHINERY

  • Lee, Y.B.;Shin, S.Y.;Oh, I.S.;Kim, H.J.;Kim, B.G.
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.II
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    • pp.446-459
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    • 2000
  • This study was carried out in order to find out an effective machinery utilization strategy by conducting a survey on utilization and maintenance of agricultural machinery. The survey showed that the no. of utilization hours for power tiller in a year was 190.2hrs, 208.6hrs for tractor, 59.1hrs for rice transplanter, 74.0 hrs for combine, 44.6 cultivator and 254.4hrs for 4.4hrs for grain dryer. The period covered the time the machine was until it became unserviceable. The results are as follows: 10.0yrs for power tiller, 7.5yrs for tractor, 7.4yrs for rice transplanter and 5.4yrs for combine. This indicate that the actual period of use for power tiller and rice transplanter was longer than the expected period of duration years so there is a need for adjustment. The factors considered by the farmers for purchasing agricultural machine were: farm size(32%), machine operation (26.0%), performance(l4.0%) and post or after sales service(12.6%), according to the survey. It showed that repair cost rate in a year was classified into major agricultural machine; 4.8% for combine; 3.9% for tractor; 3.5% for rice transplanter; 2.0% for power tiller; 1.6% for grain dryer; and 1.2% for cultivator. The reasons for poor maintenance were insufficient after sales service(25%) and difficulty in buying parts(75%) because of the unavailability of parts in local shops(55%), imported models(30%) and outmoded model(15%).

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호밀생육과 토양에 미치는 궤도형 분뇨살포기의 영향 (The Influence of Combine Crawler Attaching Slurry Spreader on Soil and Growth of Rye)

  • 류종원
    • 한국초지조사료학회지
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    • 제25권1호
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    • pp.65-70
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    • 2005
  • This study was conducted to investigate the effect of combine crawler attaching slurry spreader on soil and growth of rye. The performance test at actual field was conducted to test for possibility of practical use. Field test of the slurry spreader was operated in upland and paddy field. Experiments was conducted to compare the effects of the soil damage and crop productivity incorporating Pig slurry by two different types of slurry spreader. In this experiment a slurry spreader using crawler of combine have been designed and developed to enhance the operation in small field and reduce e damage of soil structure. but it was not suitable for transference in long distance. Conventional tractor mounted vacuum is not suitable for $71.6\%$ water condition in the small areas of paddy land. But the slurry spreader using crawler could be controlled the working point and moving by crawler in paddy land of small area. The wheels depths of soil in the supplementary application in the rye field was 4.9 m in tractor mounted spreader. but the wheels depth of crawler attaching spreader was 1.6cm. The dry matter yield of rye was reduced by $12\%$ in supplementary application of slurry due to mechanical damage from passage of the tires. This is particularly noticeable at high soil moisture condition in paddy land. It was concluded that the slurry spreader developed in this study could be successfully used for basal and supplementary application of slurry in rye paddy field.

EXAMINATION OF CALCULATION METHOD FOR THE FLEXURAL RIGIDITY OF CROP STALKS

  • Hirai, Yasumaru;Inoue, Eiji;Hashiguchi, Koichi;Kim, Young-Keun;Inaba, Shigeki;Tashiro, Katsumi
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.II
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    • pp.287-294
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    • 2000
  • Calculation of the flexural rigidity value (EI) is indispensable for prescription of deflection characteristics of crop stalks in harvesting□Conventionally□EI has been determined by either average EI of the whole stalk or average EI of each stems divided into node through the calculation method of cantilever with homogeneous section□However□deflection characteristics of crop stalks caused by mechanical operation such as combine harvester were not exactly presumed by these conventional EI through the experiment by authors. Further, actual EI of a stalk changes in company with a change of moisture contents as time passes during the experiment. Finally, efficient calculation method for determining EI is needed in order to improve these problems. In this study, mechanical model based on actual structure of the crop stalk with variety sectional area was proposed. This mechanical model is calculated by the theory of cantilever with continuous stages. Therefore, improvement of both calculating accuracy on EI and efficiency of measuring system was tried. At first, this calculation method was applied to piano wire of which EI was recognized in advance. As a result, EI calculated from this new method coincided approximately with piano wire's EI. Next, applying to crop stalks as same as piano wire, relationship between loads acting on crop stalks and deflection values calculated by EI using this new calculation method was exactly presumed in comparison with conventional method. Further, measuring time of deflection test was greatly reduced. Finally, new calculation method of EI will be available for estimating mechanical characteristics of so many kinds of crop stalks in harvesting operation. Further, in this study, new deflection test using image-processing apparatus by computer will be introduced.

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20세기후반 이후 패션 구성 방식에 나타난 모듈러 시스템 -욜리 탱, 존 리베, 갈야 로젠펠드 작품을 중심으로- (Modular System Expressed in Structural System of Fashion Since the Late of 20C -Focusing on the Fashion of Yeohlee Teng, John Ribbe, and Galya Rosenfeld-)

  • 양희영
    • 한국의류학회지
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    • 제32권5호
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    • pp.788-799
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    • 2008
  • Since the late 20C, a lot of fashion designers have considered about new construction system in fashion. Many arguments about architectural form and construction system have being supported on enlargement of range of functionalism fashion through the consideration about new shape and combination among various any other spheres. Modular concept, which is able to divide complex construction of integration into separated basic unit and use various and liberal arrangements, is regarded alternative idea of economic construction that creates new shape and constructive beauty through the simple operation and changing combination continuously. Specially, fashion designs of Yoehlee Teng, John Ribber, and Galya Rosenfeld are estimated that they are effectively utilized architectural modular system pursuing multi-function and multi-change in fashion. Modular system utilized in fashion construction will be classified as follows: 1) layering system of Yoehlee Teng, 2) combine system of john Ribber, and 3) lego system of Galya Rosenfeld. This thesis will presents beneficial guide for simple and practical functionalism fashion design development in 21C.

건설장비와 농기계에서 배출되는 연도별 대기오염 배출량 변화추세 (Annual Trends of Air Pollution Emission from Construction and Agricultural Equipments)

  • 신문기;김호정;장영기;홍지형
    • 한국대기환경학회지
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    • 제19권6호
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    • pp.805-810
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    • 2003
  • The annual air pollution emissions from construction and agricultural equipments were estimated from 1987 through 2000. The annual numbers and operation hours of 5 major construction equipments (Excavator, Bulldozer, Loader, Fork lift, Crane) and 3 major agricultural equipments (Power Tiller, Agricultural Tractor, Combine) were investigated for emission estimation. And monthly variation factors of operation hours of construction equipment were investigated too. The NO$_{x}$ emission from construction equipment have been gradually increased since 1987 to 1997, but sharply decreased as -45% in 1998 due to economic crisis in Korea. The NO$_{x}$ emission was estimated as 64,300 ton/year from construction equipment, and as 23,300 ton/year from agricultural equipment in 2000.000.

퍼지인식도를 이용한 다수 전문가지식 결합 알고리즘 개발에 관한 연구 (A Study on the Development of Multiple Experts' Knowledge Combining Algorithm by Using Fuzzy Cognitived Map)

  • 이건창;주석진;김현수
    • 한국경영과학회지
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    • 제19권1호
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    • pp.17-40
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    • 1994
  • The objectives of this paper are to apply fuzzy cognitive map (FCM)- related techniques to (1) extract causal knowledge from a specific problem-domain and (2) perform a series of causal analysis in complicated decision making area. We propose a set operation-based augmentation (SOBA) algorithm to combine multiple FCMs developed by multiple experts. Based on the SOBA knowledge acquisition algorithm, we can obtain a causal knowledge base fairly representing multiple experts' knowledge about a problem domain. The causal knowledge base built by SOBA algorithm can be described as a matrix form, guaranteeing mathematically compact operation compared with a production (if-then) knowledge base. We applied out method to stock market analysis problem whichis a typical of highly unstructured problems in OR/MS fields.

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열공급 보일러 배가스 열교환기 덕트에서 발생하는 과도 소음 현상 (Flow-Induced Noise and Vibration Due to von Karman Streets in Tube-Bank Ducts of Gas Air Heat Exchangers)

  • 김연환;구재량;배용채;이현;김성휘
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2002년도 춘계학술대회논문집
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    • pp.339-345
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    • 2002
  • When a flow passes a series of parallel ones, vortexes will be formed in the wake after the cylinder. This paper treats the problems of vibration and noise in tube bank of gas flow duct of heat exchanger thermal suppling boiler in combine cycle thermal power plants. The boiler burner type has recently been changed to low Nox burner and begun commercial operation. After more load up operation then 70%, high level noise and vibration were generated at gas flow duct of heat exchanger.

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배열 이용형 흡수식 사이클 특성평가 (Characteristics Evaluation of Absorption Cycles using the Waste Heat)

  • 윤정인;권오경;문춘근
    • 태양에너지
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    • 제18권4호
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    • pp.23-32
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    • 1998
  • Fuel cells supply electric power and heat at work, and their exhaust gas is comparatively clear. So they are in the limelight as one of the co-generation systems which behave friendly with the environment. Fuel cells discharge both steam and hot water. Accordingly, if we combine absorption heat pump driven by waste heat with fuel cells, we can construct an advanced energy conserving system. The purpose of this study is the objective for evaluating the possibilities of effectively utilizing waste heat of fuel cells as a heat source for the single and double effect absorption systems. Simulation studies on single and double effect absorption have been performed for water/lithium-bromide pair. The effectiveness of introducing a waste heat source of fuel cells is demonstrated. The result of this study showed that total efficiency was about 85% at rated operation and about 75% at 75% load operation. Absorption cycle moved to more strong concentration when fuel cell operated at 75% load.

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가야 갑주를 활용한 박물관 어린이 체험용 갑주 디자인 개발 (A Study on the Development of Armor Design for Children's Experience with Gaya Armor in Museums)

  • 조현진
    • 패션비즈니스
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    • 제18권5호
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    • pp.56-68
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    • 2014
  • The study is about developing of armor design for the children's experience with Gaya armor in museums. The aim of this paper is to combine the culture of Korean traditional armor with the development of cultural products through the research about the relic of Gaya and the analysis of the problem about the status of the operation for children's experience. The current problems of Gaya armor for the children's experience are discrepancies in the material, structure and configuration of the traditional Gaya armor in regards to the aspects of the education and; unsuitability for safety and operation of the outfit in regards to the aspects of the function. Therefore, this paper presents 10 different styles of armor design in consideration of the educational aspects and functional aspects, and this paper confirms the value of the traditional Korean armor by reaffirmation to artistic possibilities and merchantability of Gaya armor.

낙도 전력공급을 위한 복합발전시스템의 운전제어 알고리즘 (Operation Algorithm of Hybrid Power System for Power Supply in a Remote Island)

  • 김응상;김슬기;이창성
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.293-295
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    • 2001
  • In this paper, a control algorithm of a stand-alone type photovoltaic/wind/diesel hybrid power system for operation in a remote island, is proposed in detail. Power controllers are used to combine two different power outputs of photovoltaic and wind-power generations into DC output, which is converted into AC power to meet load while charging the storage battery for later use. In the event that the whole power load cannot be met by photovoltaic and wind power only, power stored in the battery cell is supplied and if even this power run out, diesel generator will be applied. Certain portion of diesel power is used to cover the load and the other to charge the battery.

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