• Title, Summary, Keyword: Feeding System

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A Study on Verification of PowerRail based on Voltage Drop under Extended Feeding Condition (연장급전 전압강하 계산을 위한 전기철도 급전 시뮬레이터의 검증에 관한 연구)

  • Kim, Joorak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.2
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    • pp.331-337
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    • 2015
  • The power flow analysis of electrified railway is required complicated calculation, because of variable load. Train runs trough rail supplied by electric power therefore, the load value in electrified railway system fluctuates along time. The power flow algorithm in electrified railway system is different from general power system, and the power flow simulation is peformed by the particular simulation software. Powerail is simulation software for analysis of traction power supply system developed by KRRI, in 2008. This consists of load forecasting module, including TPS and time scheduling, and power flow module. This software was verified by measured current under normal feeding condition, however, has not been verified by voltage on the condition of extended feeding. This paper presents the verification of PowerRail based on voltage drop under extended feeding condition. This is performed by comparing simulation result with field test. Field test and simulation is done in commercial railway line.

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.

Feeding and Management System to Reduce Environmental Pollution in Swine Production - Review -

  • Han, In K.;Lee, J.H.;Piao, X.S.;Li, Defa
    • Asian-Australasian Journal of Animal Sciences
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    • v.14 no.3
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    • pp.432-444
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    • 2001
  • In this manuscript, several effective feeding and management systems to reduce environmental pollution in swine production have been briefly introduced. It is logical that reducing the excretion of nutrients in manure should be the first step to reduce the environmental impact of pig production. it is evident that the excretion of nitrogen and phosphorus can be reduced when more digestible or available feedstuffs are used. Also, it is well known that proper feed processing can reduce anti nutritional factors (ANF) and improve nutrient digestibilities. Supplementation of effective feed additives can reduce excretion of nitrogen and phosphorus due to efficient feed utilization. These include enzymes (e.g., phytase), antibiotics, probiotics, organic acids and growth hormones ($\beta$-agonists and porcine somatotropin). One of the most effective ways to reduce pollutants from swine manure is to use synthetic amino acids in feed manufacturing. Many studies showed that reduction of 2 to 4% unit (U) of dietary protein with supplemental amino acid (AA) could dramatically reduce (15 to 20%) nitrogen excretion. Regarding feeding strategies, it has been recognized that phase feeding regimen could be used to reduce nitrogen and phosphorous excretion by feeding pigs in better agreement with age and physiological state. Feeding barrows and gilts separately, known as split sex feeding, can also decrease excretion of nitrogen and phosphorus. With the increasing concerns on the negative impact of animal production systems on the environment, animal nutritionists and producers should be aware that sustainability of animal agriculture is as important as high production performance. Therefore, some feeding and management strategies described in this manuscript will help to reduce environmental pollution in swine production. Proper combination of feeding regimen and environment-friendly diet formulation through nutritional approach will be more effective to reduce nutrient excretion in swine production system compared to single approach to do so.

A Control Technique for the Rail Potential Limit Device in DC Feeding System (직류급전계통에서 레일전위상승제한장치의 동작제어기법)

  • Min, Myung-Hwan;Jung, Ho-Sung;Park, Young;Chang, Sang-Hoon;Shin, Myong-Chul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.485-490
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    • 2012
  • Nowadays, in metropolitan railroad, DC feeding system is being generally applied. In order to reduce damage of electro-chemical corrosion caused by stray current and leakage current, in DC feeding system, rail is used as negative-polarity return conductor for traction load current. However, it has problem of rail potential increase and there are no adequate measures to prevent it in domestic. The rise of rail potential leads to damage for human and equipments. To solve the problems, this paper presents fundamental theory and related standards about rail potential increase. And then, we analyzed field testing data and simulated a variety of operations by using PSCAD/EMTDC as an analysis program of power system. In addition, this paper suggests rail potential limit device and addresses how to the device. To verify the effect, simulation of DC feeding system before and after the application of the device is carried out in various cases.

The Determination of Coagulant Feeding Rate in the Water Treatment Plant Using Intelligent Algorithms

  • Kim, Yong-Yeol;Jung, Hyung-Tae;Jang, Gil-Soo;Park, Chul-Hong;Kang, E-Sok
    • 제어로봇시스템학회:학술대회논문집
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    • pp.123.2-123
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    • 2001
  • It is difficult to determine the feeding rate of coagulant in the water treatment plant, due to nonlinearity, multivariables and slow response characteristics, etc. To deal with this difficulty, the neuro-fuzzy system and the genetic-fuzzy system were used in determining the feeding rate of the coagulant. The fuzzy system is excellently robust in multi-variables and nonlinear problems. Therefore it uses basic algorithm, but it is difficult to construct of the fuzzy parameter such as the rule table and the membership function, Therefore we made the neuro-fuzzy system and the genetic-fuzzy system with the fusion of learning algorithms and compared the performance of the two fuzzy systems. To apply these algorithms, we made the rule table, membership function from the actual operation data of the water treatment plant. We determined optimized feeding rate of coagulant using the fuzzy operation, and also compared ...

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A Tape Feeder Inspection System for Measuring Feeding Accuracy

  • Cho, Tai-Hoon
    • 제어로봇시스템학회:학술대회논문집
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    • pp.98.4-98
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    • 2001
  • A tape feeder of a SMD(Surface Mount Device) mounter is a device that sequentially feeds electronic components on a tape reel to the pick-up system of the mounter. As components are getting much smaller, feeding accuracy of a feeder becomes one of the most important factors for successful component pick-up. Therefore, it is critical to keep the feeding accuracy to a specified level in the assembly and production of tape feeders. This paper describes a tape feeder inspection system that was developed to automatically measure and inspect feeding accuracy using machine vision. It consists of a feeder base, an image acquisition system, and a personal computer. The image acquisition system is composed of CCD cameras with lens ...

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A Commercial Development of Ultrasonic Fuel Feeding System for Low Pollution and High Performance in Diesel Automobile (디젤자동차의 저공해(低公害), 고출력용(高出力用) 초음파(超音波) 연료공급장치(燃料供給裝置)의 상용화(商用化) 개발(開發))

  • Jung, M.J.;Cho, K.S.;Lee, G.Y.;Ryu, J.I.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.2
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    • pp.122-129
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    • 1995
  • This is an experimental study on the chassis dynamometer and high way road testing during a severe winter and summer season. Results obtained to compare with the ultrasonic fuel feeding system and conventional fuel system in diesel automobile engine. The results were as followers in case of the ultrasonic fuel feeding system. 1. In chassis dynamometer testing during given vehicle speeds, output were increased from 4.6 to 11.43%, brake specific fuel consumption were increased from 6 to 19%, smoke were decreased from 16.7 to 50%. 2. The running fuel consumption ratio in high way road test were decreased by 15.3% at a severe summer and 20.2% at a severe winter.

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A Study on Estimation Technique for Fault Location using Quadratic Interpolation in a Parallel Feeding AC Traction System (2차 보간법을 이용한 전기철도 급전계통의 고장점 산출 기법에 관한 연구)

  • Min, Myung-Hwan;An, Tae-Pung;Kwon, Sung-il;Jung, Hosung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.3
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    • pp.599-604
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    • 2017
  • Nowadays reactance method is being used as a technique for fault location in parallel feeding AC traction power system. However, implementation of this method requires a large number of field tests(ground fault) which is a huge burden on the operators. This paper presents a new estimation technique using quadratic interpolation to reduce number of times for field test and improves the accuracy of fault location. To verify a new technique, we solve AT feeding circuit and model it using PSCAD/EMTDC. Finally this paper conducts a comparative analysis of usefulness between a new technique and real field data.

An Analysis on Rise of Rail Potential And A Study on Control Method for It in DC Feeding System (직류급전계통에서의 레일전위 상승 분석 및 억제 방안 연구)

  • Min, Myung-Hwan;Jung, Ho-Sung;Park, Young;Kim, Hyeng-Chul;Shin, Myong-Chul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.3
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    • pp.680-685
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    • 2011
  • Nowadays, in metropolitan railroad, DC feeding system is being generally applied. In order to reduce damages of electro-chemical corrosion caused by stray current and leakage current, in DC feeding system, rail is used as negative-polarity return conductor for traction load current. However, it has problem of rail potential increase and there are no adequate measures to prevent it in domestic. In this paper, we presented fundamental theory and related standards about rail potential increase. And then, we analyzed field testing data and simulated a variety of operations by using PSCAD/EMTDC as an analysis program of power system. In addition, voltage control device is suggested to prevent accidents caused by rail potential increase.

The study of manufacturing the oxidizer(Hydrogen Peroxide) feeding system of liquid rocket engine (액체로켓엔진 산화제(과산화수소) 공급계 구축에 관한 연구)

  • Jeon, Jun-Su;Jeong, Jae-Hoon;Kim, Yoo;Ko, Young-Sung;Kim, Sun-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.33-36
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    • 2009
  • This study suggests manufacturing and cleaning the feeding system of hydrogen peroxide to use oxidizer of liquid rocket. We established the process of cleaning and passivation in order to minimize the pollution of Hydrogen Peroxide feeding system. And, we verified stability of the manufactured feeding system by leak test & hot test.

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