• Title/Summary/Keyword: feeder system

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A study on stability of feeder system considering driving of railway vehicle and rail conditions (철도차량 운행 및 선로조건에 따른 교류 급전시스템의 안정성 연구)

  • Kim, Jae-Moon;Kim, Yang-Su;Lee, Jong-Sung
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.2213-2214
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    • 2011
  • It is important to consider power stability in case of design and construction of a substation at railroad because a train is operated by electricity and tains are drived simultaneous at the same section. This paper described stability of feeder system considering driving conditions and railroad conditions of train which is drived. Simulation tool, TOM(Train Operations Model) software is used to ensure stability of feeder system. As results of simulation, feeder voltage source is in limits on driving operation dia of trains.

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Development of the Linear Feeder for Uniform Transportation of Grains (균일한 곡물이송을 위한 색채 선별기용 리니어 피더의 개발)

  • Lee, Kyu-Ho;Kim, Sung-Hyun;Chung, Jin-Tai
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.567-570
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    • 2006
  • The purpose of this study is to develope a linear feeder for uniform transportation of grains and to present its design guide line. so, It is measured the displacement of the front and rear aspect of the feeder in time domain. And the measured time signal is represented to the plane coordinate. From this process, it is presented the motion of the feeder in a harmonic excited condition. Also, It is determined whether translation motion or rotation motion. From these course, it is defined the optimized dynamic motion for uniform transportation of grains. It is included a ratio of the displacement and the angle which the dynamic motion between the front and rear aspect of the feeder.

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Dynamic Analysis of a Linear Feeder for Uniform Transformation of Grains (곡물의 균일한 이송을 위한 리니어 피더의 동특성 해석)

  • Lee, Kyu-Ho;Kim, Syung-Hyun;Chung, Jin-Tai
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.11
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    • pp.1069-1076
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    • 2007
  • The purpose of this study is to improve the performance of a linear feeder that can transport grains uniformly. In order to analyze the dynamic behaviors of a linear feeder, the displacements of the feeder are measured by several accelerometers when it is in an operating condition. After the signal data from the accelerometers are captured in the time domain, the feeder motion in the space is visualized by using graphic computer software. In addition, a dynamic model of the feeder is established for a multi-body dynamics simulation. For the dynamic simulation, RecurDyn, which is a commercial multi-body dynamic package, is used. From the experimental and the computational approaches, an optimal dynamic motion is obtained for uniform transportation of grains. Furthermore, we also consider the determination of design parameters for optimal dynamic motion such as centroid, stiffness, and damping coefficient of the feeder system.

A Study on the Performance Analysis for a Tape Feeder with Cam-slider Mechanism (캠-슬라이더 메커니즘 테이프 피더의 성능평가에 관한 연구)

  • Jeon Byung-Cheol;Cho Myeong-Woo;Moon Chan-Young;Lee Soo-Jin;Choi Jin-Hwa
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.5 s.182
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    • pp.177-183
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    • 2006
  • A tape feeder is an important feeding device to supply micro-chips such as 1005 and 0603 components to PCB in SMT process. Traditionally, tape feeding methods using sprocket wheel mechanism has been used for the pickup system of chip-mounters. However, there is growing needs for new feeding mechanism with high accuracy and confidence as electric components are getting much smaller. Thus, recently, a tape feeder using cam-slider mechanism is developed to meet such requirements. The major advantages of developed system are; significantly reduced indexing and backlash errors, slim and compact design, and improved repetitive capacity compared to existing system. In this paper, the performance evaluation criteria for the developed tape feeder are suggested. Stability against induced vibration, positioning accuracy, cycle time, durability and supply error rate are estimated using developed self testers. As a result, the excellence of developed tape feeding mechanism is validated using the effective rating methods.

Development of Feeder Automation Software Considering the Diversity Events of Distribution Systems (배전계통의 다양한 이벤트들을 고려한 선로자동화 소프트웨어 개발)

  • 고윤석
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.8
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    • pp.463-470
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    • 2003
  • This paper proposes an expert system, which is able to determine the problem-solving strategy for diversity events occurred on the distribution system. The events include events related to the fault, scheduled outage and optimal operating task such as feeder line fault, line scheduled outage, line overload, system load balancing, system loss minimization, main transformer fault, main transformer scheduled outage, main transformer overload, main transformer protection control. The expert system enhances the reliability of software designed by the integrated concept for the diversity events. The expert system is implemented in C language. And the effectiveness and accuracy for the expert system is verified by simulating the event cases for typical distribution model.

A Study on Total Mixed Ration Feeding System for Feeding Pigs (1) - Development of Monorail Traveling TMR Feeder for Grow-Finish Pigs -

  • Kim, Hyuck Joo;Yu, Byeong Kee;Hong, Jong Tae;Choi, Kyu Hong;Yu, Ji Su;Hong, Youngsin;Ha, Yu Shin
    • Journal of Biosystems Engineering
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    • v.38 no.4
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    • pp.295-305
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    • 2013
  • Purpose: Recent research showed that total mixed ration (TMR) feeding for pigs improved the productivity and reduced feed cost and manure odor. An automatic TMR feeding system was developed for this study because the conventional feeder cannot deliver the TMR containing roughage. Methods: Conventional feeding systems and physical properties of TMR were surveyed, and performance tests of the conventional feeder were conducted to develop a TMR feeder. Based on the TMR feeder was developed and installed, driving, measuring weight, radio frequency identification (RFID) reading, and discharging test for feeding were conducted to ensure the performance. Results: Moisture content, density, and angle of repose of the TMR 1 (mixture of 30% cut IRG silage and 70% concentrates) were 31.6%, 387 $kg/m^3$, and $51^{\circ}$, respectively. Moisture content, density, and angle of repose of the TMR 2 (mixture of 45% concentrates, 30% cut IRG silage and by-products, 10% bean curd refuse, 10% others, and 5% fermenter) were 22.2%, 544 $kg/m^3$, and $50^{\circ}$, respectively. The coefficient of variation (C.V.) of conventional concentrate feeding were 1.9~4.1%, and C.V. of TMR containing 1~3% cut IRG roughage feeding by conventional feeder were 9~42%. The conventional disc type feeder was not suitable for TMR feeding because the supply unit was clogged. The C.V. of TMR 1 was 0.6~7.9% when 0.5~10 kg of the TMR supplied, and it was suitable for feeding grow-finish pigs and sows. On the contrary, the C.V. with TMR 2 was 28% when 0.5 kg of the TMR supplied, and it was not suitable for feeding sows. Conclusions: The TMR feeder developed in this study was suitable for feeding grow-finish pigs because the feeder performed stably with over 5.0 kg feed. However, the feeder showed a lack of accuracy for feeding sows because the amount of each feed was more than 0.5 kg per a feeding. Therefore, the improvement of outlet structure for accurate feeding is needed for sow feeding.

Development of the Algorithm for Discriminating Faults from Variation using Wavelet Transform (웨이블릿 변환을 이용한 고장과 Variation의 유형 구분 알고리즘 개발)

  • Seo, Hun-Chul;Lee, Soon-Jeong;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.8
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    • pp.1460-1466
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    • 2011
  • This paper proposes the algorithm for discriminating faults from the variation due to the operation of non-linear components to prevent the mal-operation of protection relay in the distribution system. An IEEE 13 node test feeder is modeled to analyze the characteristics of the fault and each variation using EMTP-RV. Simulations with various operating conditions of transformers, non-linear loads, and unbalanced loads are performed using the test feeder model. Based on simulation results, the wavelet transform is adopted to analyze the current waveforms from the faults and variations to find out the differences between them and the algorithm for discriminating faults from the variation is proposed. The proposed algorithm is verified by using the current waveforms simulated in the KEPCO's distiribution system and IEEE 13 node test feeder.

A Dynamic Programming Approach to Feeder Arrangement Optimization for Multihead-Gantry Chip Mounter (동적계획법에 의한 멀티헤드 겐트리형 칩마운터의 피더배치 최적화)

  • 박태형
    • Journal of Institute of Control, Robotics and Systems
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    • v.8 no.6
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    • pp.514-523
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    • 2002
  • Feeder arrangement is an important element of process planning for printed circuit board assembly systems. This paper newly proposes a feeder arrangement method for multihead-gantry chip mounters. The multihead-gantry chip mounters are very popular in printed circuit board assembly system, but the research has been mainly focused on single-head-gantry chip mounters. We present an integer programming formulation for optimization problem of multihead-gantry chip mounters, and propose a heuristic method to solve the large NP-complete problem in reasonable time. Dynamic programming method is then applied to feeder arrangement optimization to reduce the overall assembly time. Comparative simulation results are finally presented to verify the usefulness of the proposed method.

The hardware and software design of new distribution automation system (신 배전자동화 시스템의 하드웨어 및 소프트웨어 설계)

  • Ha, Bok-Nam;Han, Yong-Huei;Lee, Jung-Ho;Cho, Nam-Hun;Lim, Seong-Il
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1428-1430
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    • 1999
  • The New Distribution Automation System(NDAS) was composed of several equipments, computer system, communication system, feeder remote unit, switches and so on. In this paper, we introduce the conception of hardware and software design about Central Control System, the communication method and protocol in Feeder Remote Unit, the Automatic Switch, the operating software, consideration factors in the feeder automation(FA) and the system configuration of NDAS in power distribution test center.

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An Adaptive Genetic Algorithm Based Optimal Feeder Routing for Distribution System Planning (적응 유전알고리즘을 이용한 배전계통 계획의 급전선 최적경로 선정)

  • Kim, Byung-Seop;Kim, Min-Soo;Shin, Joong-rin
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.2
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    • pp.58-66
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    • 2001
  • This paper presents an application of a newly designed Adaptive Genetic Algorithm (AGA) to solve the Optimal Feeder Routing (OFR) problem for distribution system planning. The main objective of the OFR problem usually is to minimize the total cost that is the sum of investment costs and system operation costs. We propose a properly designed AGA, in this paper, which can handle the horizon-year expansion planning problem of power distribution network in which the location of substation candidates, the location and amount of forecasted demands are given. In the proposed AGA, we applied adaptive operators using specially designed adaptive probabilities. we also a Simplified Load Flow (SLF) technique for radial networks to improve a searching efficiency of AGA. The proposed algorithm has been evaluated with the practical 32, 69 bus test system to show favorable performance. It is also shown that the proposed method for the OFR can also be used for the network reconfiguration problem in distribution system.

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