• Title/Summary/Keyword: Actual Load

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The Distribution of the Normal Traffic Loads on the Steel Plate Girder Bridge (실동하중에 의한 강판형교의 교통하중 분포)

  • Woo, Sang-Ik;Jung, Kyoung-Sup
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.4 no.2
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    • pp.103-111
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    • 2000
  • The objectives of the study are to know the strain distribution and modal dynamic behaviour of steel bridge girders by actual traffic load. The live load effect depends on many parameters including the span length, gross vehicle weight, axle weight, axle configuration so on. For the estimation of static and dynamic characteristic, strain data caused by moving loads and traffic characteristics of passing vehicle under actual traffic load have measured using Bridge Weigh in Motion. To confirm the reliability of BWIM system, strain data measured using the $120{\Omega}$ strain gauge under the same condition. It is considered that the data acquired from BWIM system have reliability through the analysis and comparison between stress measured by strain data from BWIM and computed by FEM. Additionally according to the measured strain data of up-line and down-line on the highway, the up-line bridge grows more faster than the down-line bridge and girder 4 and 5 carry more load when vehicles pass the inner line and girder 2 and 3 does when vehicles pass the outer line as this case(the bridge composed with 5 girders).

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Influence on heat transfer due to uneven flow (유동 불균일이 전열관 튜브에 미치는 영향)

  • Chong, Chae-Hon;Song, Jung-Il
    • 한국태양에너지학회:학술대회논문집
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    • 2008.11a
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    • pp.273-279
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    • 2008
  • The purpose of this study is not only to evaluate thermal performance but also to find the stress behavior of heat transfer tubes under the part load operation in Heat Recovery Steam Generator. Flow analysis was performed to know the behavior of exhaust gas from gas turbine and thermal performance was calculated using distribution of hot exhaust velocity. In addition, tubes temperature during operation were gathered from actual plant to verify the uneven flow distribution under part load operation. Stress analysis was performed using tubes temperature data gathered from actual plant under both part and full load operations to know the stress behavior of tubes.

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S-N Curve Estimation of a KTX Structure for an Accelerated Life Testing (가속수명시험을 위한 KTX 구조물의 S-N 선도 추정)

  • Jung, Dal-Woo;Choi, Nak-Sam;Park, Su-Han
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.384-389
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    • 2008
  • An accelerated fatigue test is essentially required to maintain the reliability of the actual structure of KTX under operation conditions. However, actual fatigue life cannot be obtained if specimens are not adequate to the conventional fatigue test. Moreover component maker did not provide data of loading stress (S) - cycles at the failure (N). In this study, we suggest a prediction method of the S-N curve for establishing an accelerating test under various load levels. Load history was acquired from the field tests. A Rainflow method was used on the cycle counting of the field load data, and then, an S-N curve was obtained through the iteration process under the condition that the damage index satisfies to 1 in the Miner's rule.

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Simulation of Block Logistics at a Big Shipyard (대형 조선소의 블록 물류 시뮬레이션)

  • Song, Chang-Sub;Kang, Yong-Woo
    • Korean Journal of Computational Design and Engineering
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    • v.14 no.6
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    • pp.374-381
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    • 2009
  • To meet the soaring demand recently, South Korea big shipbuilders are examining two things. One is new investment in plant and equipment. The other is replacement of production resources. Considering plant & equipment investment and replacement of production resources, even if actual production ability would be enough, the real output could be affected by limitation of logistics with lack of analysis. As we set up big shipyard in virtual space, we could perform actual production by using confirm production plan in virtual space. We've analyzed the load of block stock, load of road and load of transporter for logistics effects are followed by production increase. This research is to determine the possible problems of those analyzed results and to present the resolution using the current layout. And then modified yard layout, we reanalyzed previous three logistics effects. This simulation model could help administrator to make rational decision for changing yard layout.

A Comparative Analysis of Energy Simulation Results and Actual Energy Consumption on Super High-rise Apartments (초고층 공동주택의 세대별 냉난방부하 시뮬레이션 결과 및 에너지 실사용량과의 비교 분석)

  • Suh, Hye-Soo;Kim, Byung-Seo
    • Journal of the Korean Solar Energy Society
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    • v.31 no.4
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    • pp.34-40
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    • 2011
  • Apartment Housing has been increasing steadily, particularly our current super high-rise apartment houses that represent the culture has become a trend in Korea. These super high-rise apartment houses' curtain wall system increases heating and cooling loads, it is expected to vary by each unit's thermal properties. In this study, measured indoor environment and energy simulation results were compared to actual energy consumption. As a result, the various factors that affect heating and cooling loads, such as direction, plan type and glazing area, influence each unit's load characteristic. In particular, according to the electricity costs savings behavior, the occupant's thermal discomfort is expected to be large in summer. Therefore, to reduce heating and cooling load for each unit requires a reasonable plan.

Short-term Electric Load Prediction Considering Temperature Effect (단파효과를 고려한 단기전력 부하예측)

  • 박영문;박준호
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.35 no.5
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    • pp.193-198
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    • 1986
  • In this paper, 1-168 hours ahead load prediction algorithm is developed for power system economic weekly operation. Total load is composed of three components, which are base load, week load and weather-sensitive load. Base load and week load are predicted by moving average and exponential smoothing method, respectively. The days of moving average and smoothing constant are optimally determined. Weather-sensitive load is modeled by linear form. The paramiters of weather load model are estimated by exponentially weighted recursive least square method. The load prediction of special day is very tedious, difficult and remains many problems which should be improved. Test results are given for the day of different types using the actual load data of KEPCO.

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Grouping Method of Loads to Verify the Aggregation of Component Load Models (개별부하 축약을 검증하기 위한 집단부하 구성방법에 관한 연구)

  • Ji, Pyeong-Shik;Lee, Jong-Pil;Lim, Jae-Yoon
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.4
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    • pp.172-179
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    • 2001
  • A component based method out of load modeling is to aggregate component load model according to the composition rate of each component load at load bus based on the circuit theory. But the most of component loads respond complex nonlinear characteristics respect to voltage and frequency variation due to the control techniques and semiconductor elements applied to component load. It needs to verify this approach through actual experiment of the aggregation of component load even if it can be down. To identify this aggregation method well known, this paper is proposed the classifying method of component load characteristics for component loads to group by quantitative analysis. The component load characteristics were divided into several types by KSOM (kohonen self organizing map), which can classify multi-dimension vector, component load pattern, into two-dimension vector. Some ambiguous cases happened from KSOM were classified by the proposed closing degree.

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A Study on the Generating System Reliability Evaluation (발전계통의 신속도 산정에 관한 연구)

  • 김준현;황갑주;송석하
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.32 no.3
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    • pp.69-75
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    • 1983
  • This paper presents a improved algorithm for the generating capacity reliability evaluation using the frequency and duration approach. One of the specific feature of this algorithm is that propose the cumulative state load model via analytic expression of load duration curve and cumulative load frequency characteristic in conside ration of daily peak load. The paper illustrates the utilization of the proposed algorithm in actual system studies using the generating system of KEPCO. The results presented will provide a valuable reference for maintaining and planing the generating system.

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The Load Current Observer Design for Torque Control of DC Meter (직류 전동기의 속도 토크 제어를 위한 부하 전류 관측기 설계)

  • Seo Young-Soo;Kim Eun-Gi;Kim Yong-Ju
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.155-158
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    • 2001
  • In this paper, the Load Current Observer Design for 3-phase Voltage Type PWM Converter with DC Meter Load. The sinusoidal input current and unity input power factor are realised based on the estimated source voltage performed by the Load Current Observer using actual currents and DC link voltage.

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