• 제목/요약/키워드: Load pattern modeling

검색결과 58건 처리시간 0.018초

Sequential pattern load modeling and warning-system plan in modular falsework

  • Peng, Jui-Lin;Wu, Cheng-Lung;Chan, Siu-Lai
    • Structural Engineering and Mechanics
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    • 제16권4호
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    • pp.441-468
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    • 2003
  • This paper investigates the structural behavior of modular falsework system under sequential pattern loads. Based on the studies of 25 construction sites, the pattern load sequence modeling is defined as models R (rectangle), L and U. The study focuses on the system critical loads, regions of largest reaction forces, discrepancy between the pattern load and the uniform load, and the warning-system plan. The analysis results show that the critical loads of modular falsework systems with sequential pattern loads are very close to those with the uniform load used in design. The regions of largest reaction forces are smaller than those calculated by the uniform load. However, the regions of largest reaction forces of three models under sequential pattern loads can be considered as the crucial positions of warning-system based on the measured index of loading. The positions of the sensors for the warning-system for these three different models are not identical.

역학적 특성을 고려한 드럼세탁기 부하 모델링 (Load Modeling of the Drum Washing Machine Considering the Mechanical Characteristics)

  • 이정효;이원철;유재성;정용채;원충연
    • 전력전자학회논문지
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    • 제12권6호
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    • pp.491-499
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    • 2007
  • 전동기 구동에 있어서 부하 특성의 변화는 가장 중요하게 고려해야 할 것 중 하나이다. 일반적으로 부하의 변동은 전동기에 흐르는 전류의 크기를 변화시키므로 그 변동의 크기에 따라 적절한 드라이브를 설계해야 할 필요가 있다. 하지만 물의 흐름과 역방향 부하토크 때문에 드럼 세탁기의 부하 변동은 불규칙하며 크다. 이러한 부하 패턴을 고려한 드럼 세탁기의 구동 드라이브를 설계하기 위하여 세탁기 부하의 변동을 물리적 해석을 통해서 모델링 하고자 한다.

데이터베이스를 이용한 부하패턴별 수용가 특징 모델링 (Customer Characteristics Modeling for Each Load Pattern using the Database)

  • 이영석;김재철;오정환;윤상윤;박창호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 A
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    • pp.416-418
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    • 2001
  • This Paper presents the 2-step load cycle of daily load curve for representative load pattern of power distribution transformer. We decide the representative load pattern of distribution transformer in domestic using the pattern classification algorithm. The K-mean method is used for the pattern classification algorithm. The acquisition equipment of field load data is utilized for 96-sample distribution transformers and the field data is used in the construction of the database for the creation of daily load pattern.

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드럼세탁기 구동시스템 시뮬레이션을 위한 부하 모델링 (Load modeling for the drum washing machine system simulation)

  • 이정효;이병국;원충연
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2007년도 하계학술대회 논문집
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    • pp.412-414
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    • 2007
  • In motor driving, one of the most important consideration is the load characteristic and variation. Generally, the motor drive should be made enough for the current by load variation, and it should be controlled by the load weight. However, the drum washing machine's load variation is irregular and large. Therefore, we want to make the motor drive that considering this load pattern, this paper describes the drum washing machine's load pattern modeling by the mathematical theory.

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Copula 함수를 이용한 HEMS 내 전력소비자의 부하 사용패턴 모델링 및 그 적용에 관한 연구 (A Study on Modeling of Users a Load Usage Pattern in Home Energy Management System Using a Copula Function and the Application)

  • 신제석;김진오
    • 전기학회논문지
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    • 제65권1호
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    • pp.16-22
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    • 2016
  • This paper addresses the load usage scheduling in the HEMS for residential power consumers. The HEMS would lead the residential users to change their power usage, so as to minimize the cost in response to external information such as a time-varying electricity price, the outside temperature. However, there may be a consumer's inconvenience in the change of the power usage. In order to improve this, it is required to understand the pattern of load usage according to the external information. Therefore, this paper suggests a methodology to model the load usage pattern, which classifies home appliances according to external information affecting the load usage and models the usage pattern for each appliance based on a copula function representing the correlation between variables. The modeled pattern would be reflected as a constraint condition for an optimal load usage scheduling problem in HEMS. To explain an application of the methodology, a case study is performed on an electrical water heater (EWH) and an optimal load usage scheduling for EHW is performed based on the branch-and-bound method. From the case study, it is shown that the load usage pattern can contribute to an efficient power consumption.

기후조건 및 실부하패턴을 고려한 태양광 시스템 최적 운전기법 (Photovoltaic System Operation Optimal Technique Considering Climate Condition and Residential Loads Pattern)

  • 문희성;최규영;김종수;이영국;이병국
    • 전기학회논문지
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    • 제58권12호
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    • pp.2385-2390
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    • 2009
  • Based on the detailed analysis of output characteristics of PV array and residential load usage pattern, a design method to calculate optimal battery capacity for stand-alone PV generation systems is proposed. And also, according to power flow Actual irradiation and temperature data are analyzed to compose a PV array simulator and also six representative home appliances are electrically modeled for load simulator, along with 24hours usage pattern. The surplus and insufficient power can be calculated from the proposed simulation platform, so that selection of an optimal battery capacity can be possible. The theoretical analysis and design process will be explained, along with informative simulation results.

신재생에너지 모델링을 위한 풍력 및 태양광 발전 출력 패턴 상관관계 분석 (Correlation Analysis of Wind and Solar Power Generation Pattern for Modeling of Renewable Energy)

  • 김민정;박영식;박종배;노재형
    • 전기학회논문지
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    • 제60권10호
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    • pp.1823-1831
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    • 2011
  • When the RPS(Renewable Portfolio Standards) becomes effective in 2012, the use of renewable energy will be dramatically increased. However, there are no production simulations and demand supply programs that reflect the characteristics of the renewable energy. This paper analyzes correlations of the domestic wind power and solar power generation pattern in different areas and those of these sources' output and load pattern. Based on the regional correlation analysis, an appropriate method that uses a average output of the renewable energy or another modeling that takes account of uncertainty could be selected. Because it's output is dependent on weather condition, we can not control the generation of renewable energy, that is the reason why the correlation between the load and output pattern of sources can be helpful to determine whether the renewable energy is modeled as a generator or load modifier. Through this analysis, a basis will be provided in order to properly model the renewable energy source.

Modeling Cutter Swept Angle at Cornering Cut

  • Chan, K.W.;Choy, H.S.
    • International Journal of CAD/CAM
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    • 제3권1_2호
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    • pp.1-12
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    • 2003
  • When milling concave corners, cutter load increases momentarily and fluctuates severely due to concentration and uneven distribution of material stock. This abrupt change of cutter load produces undesirable machining results such as wavy machined surface and cutter breakage. An important factor for studying cutter load in 2.5D pocket milling is the instantaneous Radial Depth of Cut (RDC). However, previous work on RDC under different corner-cutting conditions is lacking. In this different corner shapes. In our work, we express RDC mathematically in terms of the instantaneous cutter engage angle which is defined as Cutter Swept Angle (CSA). An analytical approach for modeling CSA is explained. Finally, examples are shown to demonstrate that the proposed CSA modeling method can give an accurate prediction of cutter load pattern at cornering cut.

Effect of Load Modeling on Low Frequency Current Ripple in Fuel Cell Generation Systems

  • Kim, Jong-Soo;Choe, Gyu-Yeong;Kang, Hyun-Soo;Lee, Byoung-Kuk
    • Journal of Electrical Engineering and Technology
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    • 제5권2호
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    • pp.307-318
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    • 2010
  • In this work, an accurate analysis of low frequency current ripple in residential fuel cell power generation systems is performed based on the proposed residential load model and its unique operation algorithm. Rather than using a constant dc voltage source, a proton exchange membrane fuel cell (PEMFC) model is implemented in this research so that a system-level analysis considering the fuel cell stack, power conditioning system (PCS), and the actual load is possible. Using the attained results, a comparative study regarding the discrepancies of low frequency current ripple between a simple resistor load and a realistic residential load is performed. The data indicate that the low frequency current ripple of the proposed residential load model is increased by more than a factor of two when compared to the low frequency current ripple of a simple resistor load under identical conditions. Theoretical analysis, simulation data, and experimental results are provided, along with a model of the load usage pattern of low frequency current ripples.

승용차용 전장시험 자동화 시스템 설계 (Design of an Automatic Test System for Electronic Equipments in Vehicles)

  • 이창훈;김유남
    • 한국자동차공학회논문집
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    • 제9권1호
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    • pp.131-138
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    • 2001
  • The performance analysis of an electronic equipment test is very complicate due to the variety o vehicles. In this study, automatic design system for the electronic equipment test has been carried out using the standard load patterns. For the test, standard signal patterns for each item are modeled. The test items can be decided by the user by means of these patterns. Also, engineering software modules are developed and proved to be very efficient for analyzing the test results statistically. Experiments are performed for the test system in the vehicle assembly line. By analyzing the test results, it is found that bad samples can be detected without failure. Also, the engineering software modules provide an analytical tool for the automation of the test process.

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