• Title, Summary, Keyword: Feeding System

Search Result 1,454, Processing Time 0.045 seconds

A Study on Coagulant Feeding Control of the Water Treatment Plant Using Intelligent Algorithms (지능알고리즘에 의한 정수장 약품주입제어에 관한 연구)

  • 김용열;강이석
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.9 no.1
    • /
    • pp.57-62
    • /
    • 2003
  • 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 genetic-fuzzy system genetic-equation system and the neural network system were used in determining the feeding rate of the coagulant. Fuzzy system and neural network system are excellently robust in multivariables and nonlinear problems. but fuzzy system is difficult to construct the fuzzy parameter such as the rule table and the membership function. Therefore we made the genetic-fuzzy system by the fusion of genetic algorithms and fuzzy system, and also made the feeding rate equation by genetic algorithms. To train fuzzy system, equation parameter and neural network system, the actual operation data of the water treatment plant was used. We determined optimized feeding rates of coagulant by the fuzzy system, the equation and the neural network and also compared them with the feeding rates of the actual operation data.

Reliability Modeling of Direct Current Power Feeding Systems for Green Data Center

  • Choi, Jung Yul
    • Journal of Electrical Engineering and Technology
    • /
    • v.8 no.4
    • /
    • pp.704-711
    • /
    • 2013
  • Data center is an information hub and resource for information-centric society. Since data center houses hundreds to ten thousands servers, networking and communication equipment, and supporting systems energy saving is one of the hottest issues for green data center. Among several solutions for green data center this paper introduces higher voltage direct current (DC) power feeding system. Contrary to legacy alternating current (AC) power feeding system equipped with Uninterruptible Power Supply (UPS), higher voltage DC power feeding system is reported to be a more energy efficient and reliable solution for green data center thanks to less AC/DC and DC/AC conversions. Main focus of this paper is on reliability issue for reliable and continuous operation of higher voltage DC power feeding system. We present different types of configuration of the power feeding systems according to the level of reliability. We analyze the reliability of the power feeding systems based on M/M/1/N+1/N+1 queueing model. Operation of the power feeding system in case of failure is also presented.

Inductive Disturbance Reduction Method for Electric Railway (전기철도해서의 유도장해 경감책에 관한 연구)

  • Lee, Kyo-Sung;Kim, Do-Hun;Lee, Yong-Jae;Kim, Yang-Mo
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.369-371
    • /
    • 2002
  • The railway power feeding system is divided into AC power feeding system and DC power feeding system. In downtown area. DC power feeding system is used and AC power feeding system is used in intercity railway system. AC power feeding system raises a inductive disturbance that is divided into electrostatic induction and electromagnetic induction. Especially, it has a bad effect on communication lines. So inductive disturbance reduction method has been adopted in many system. In this paper, we deals with the inductive disturbance reduction method of railway power feeding system and of sides affected by inductive disturbance.

  • PDF

Structural Characteristic Analysis on the Hydrostatic Guide Way and Feeding System of a High-Precision Centerless Grinder for Machining Ferrules (페룰 가공용 초정밀 무심 연삭기의 유정압 안내면 및 이송계에 대한 구조 특성 해석)

  • Kim, Seok-Il;Lee, Won-Jae;Cho, Sun-Joo
    • Proceedings of the KSME Conference
    • /
    • /
    • pp.1008-1013
    • /
    • 2003
  • This paper concerns the structural characteristic analysis and evaluation on the hydrostatic guide way and feeding system of a high precision centerless grinder for machining ferrules. In order to realize the required accuracy of ferrules with sub-micron order, the axial stiffness and motion accuracy of feeding system have to become higher level than those of existing centerless grinders. Under these points of view, the physical prototype of feeding system consisted of steel bed, hydrostatic guide way and ballscrew feeding mechanism is designed and manufactured for trial. Experimental results show that the axial and vertical stiffnesses of the physical prototype are very low as compared with those design values. In this paper, to reveal the cause of these stiffness difference, the structural deformations on the virtual prototype of feeding system are analyzed based on the finite element method under experimental conditions. The simulated results illustrate that the deformation of front ballscrew support-bearing bracket is the main cause of reduction in the axial stiffness of feeding system, and the deflection of bed structure and the bending deformation of hydrostatic guide rails are the main causes of reduction in the vertical stiffness of feeding system.

  • PDF

Gain Parameter Determination for the Feeding Speed and Skew Controller of Media Transport System using Optimization Technique (최적화 기법을 적용한 매체 이송 시스템의 이송속도 및 비틀어짐 제어기의 이득값 결정)

  • Cha, Ho-Young;Bum, Sun-Ho;Kim, Min-Soo;Lee, Soon-Geul
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.33 no.6
    • /
    • pp.607-613
    • /
    • 2009
  • In this paper, we made a simple paper feeding system which is one of MTS (media transport system) and controllers. The plant has a flexible paper and two driving rollers and two driven rollers. The control system has two conventional PID controllers. Skew angle and feeding speed of MTS deteriorate the quality of feeding system. In order to control a feeding speed and skew of feeding paper, we control rotational velocity of two driving rollers. Therefore, this controller has two inputs and two outputs as MIMO (multi-input and multi-output) system. The control inputs were the feeding speed and the skew displacement of the paper. The control outputs were the rotational velocity to each driving roller. To find appropriate PID gains of two controllers, we proposed an optimization technique. We assume the system variables and performance of a whole system as follows. PID gains of two controllers for skew and feeding speed are system variables. System performance is both skew and feeding speed. We simulates to making mathematical correlation using global Kriging interpolation. To find appropriate value of system variables, optimization method is simulation in sequence as following method. First, the optimization solver simulates with DOE (design of experiment) tables to find correlation equation of both system variable and performances. Then, the solver guesses the appropriate values and simulates if the system variables are appropriate or not. If the result of validation doesn't satisfy the convergence and iteration tolerance, the solver makes a new Kriging models and iterates this sequence until satisfy the tolerances.

Cases of Eco-Friendly Pigsty and Hog Feeding and Management Based on u-IT Information Systems

  • Jang, Ik Hun;Park, Seong Hee;Choi, Young Chan;Kim, Young Hwa
    • Agribusiness and Information Management
    • /
    • v.4 no.2
    • /
    • pp.42-49
    • /
    • 2012
  • This study introduces cases of individual feeding systems for sow and the sow sorters which are the subparts of an eco-friendly feeding and management system based on a u-IT program using the hog feeding and management information system. The purpose of this study is to conduct an analysis of economic feasibility on cases of the improvement of the system using the u-IT and to provide information on the positive effects of an introduction of an eco-friendly pigsty and hog feeding and management system to hog raisers and government officials. The literature review and background section examine the effects of the introduction of u-IT technology into the field of livestock raising, hog feeding and management information system, and the eco-friendly feeding and management system based on the u-IT. This paper will present the results of the analysis on the effects and the economic feasibility of the individual feeding system for sow and the sow sorter utilizing the u-IT technology and information systems. The results of this study will contribute to the sustainable development of the hog raising industry by showing that the new feeding and management system utilizing the u-IT can not only increase the efficiency and productivity of farm management but also contribute to efficient, eco-friendly hog feeding and management.

  • PDF

Development of Automatic Feeding System for Corrugate Cardboard Boxes Using TRIZ (트리즈를 이용한 포장 박스용 골판지 자동 급지기 개발)

  • Park, Yong-Taek;Kuk, Kum-Hoan
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.24 no.2
    • /
    • pp.95-102
    • /
    • 2007
  • A feeding system is a key component in manufacturing packing boxes such as printing, slotting and gluing. The role of the feeding system is to feed corrugate cardboards which is usually tick and large. So, a special method is necessary to feed corrugate cardboards. This paper suggests a concept and an automatic feeding machine to feed corrugated cardboards using TRIZ, the theory of inventive problem solving. The automatic feeding machine consists of units to regulate the machine according to length and width of corrugated cardboards, a feeding part with a plurality of small rollers, and a sucking part which intensify frictional force between rollers and the lowest feeding cardboard. In particular, the feeding part is composed of an up-and-down motion plate with holes to suck the lowest corrugated cardboard as well as small rolling rollers after stopping in a moment. Thus this machine does not sensitive to size of corrugated cardboards and also can keep feeding accuracy during feeding fast.

A Power Losses Analysis of AC Railway Power Feeding Network using Adaptive Voltage Control (능동형 전압제어를 통한 교류 전기철도 급전망에 대한 전력손실 분석)

  • Jung, Hosung;Kim, Hyungchul;Shin, Seongkuen;Kim, Jinho;Yoon, Kiyong;Cho, Yonghyeun
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.62 no.11
    • /
    • pp.1621-1627
    • /
    • 2013
  • This paper compares power losses between voltage controlled before and after using power conversion device in AC feeding system. For this purpose we present voltage control procedures and criteria and model high speed line and train using PSCAD/EMTDC to compare power losses in various feeding condition. Power losses of the simulation result in power control before and after in single point feeding system was reduced maximum 0.37 MW(23.8 %) and average 0.23 MW(20.5 %) when one vehicle load operates maximum load condition. When three vehicles operate maximum load condition in one feeder section, power losses after voltage control was reduced 1.03 MW(49.5%) compared to before voltage control. And, power loss of parallel feeding system is reduced the average 0.08 MW(7.2 %) compared to the single feeding system. In conclusion, adaptive voltage control method using power conversion device can reduce power losses compared with existing method.

The Effects of Two Different Feeding Systems on Blood Metabolites in Holstein Heifers and the Economic Impact Analysis of the Feeding Systems

  • Kim, Tae Il;Vijayakumar, Mayakrishnan;Ki, Kwang Seok;Kim, Ki Young;Park, Boem Young;Sung, Kyung il;Lim, Dong Hyun
    • Journal of The Korean Society of Grassland and Forage Science
    • /
    • v.36 no.4
    • /
    • pp.381-386
    • /
    • 2016
  • The objective of this research was to evaluate the effects of two different feeding systems on blood metabolites in Holstein heifers and analyze the economic impacts of the feeding systems. The following two experiments were conducted to investigate the effects of feeding system on blood metabolite changes in Holstein heifers and analyze the economic impacts of the two systems. In experiment 1, the effects of two different feeding systems on cortisol, progesterone, and estradiol in Holstein heifers were examined. In experiment 2, the effects of two different feeding systems on the body weights of Holstein heifers and profitability of the two feeding systems were studied. Results showed that the pasture-raised heifers showed significantly decrease in the levels of blood cortisol (p<0.05) and increases in the levels of progesterone and estradiol (p>0.05) when compared with heifers raised in indoor feeding system. The average daily gain was significantly higher (p<0.05) in indoor-raised heifers (0.73 kg/day) as compared to pasture-raised heifers (0.58 kg/day). Also, 25.2% more profits were obtained from the pasture feeding system as compared to the indoor feeding system. These results together would be useful in the investigation of feeding system and growth performance in dairy cattle.

A Study on the Feeding System of Centerless Grinder for Machining the Ferrule (페룰가공용 무심연삭기 이송계 개발)

  • 박천홍;황주호;조순주
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • /
    • pp.65-69
    • /
    • 2002
  • In order to practicalize high precision centerless grinder for machining the ferrule, its feeding system is designed and tested. For satisfying the desired diametric tolerance and cylindricity of the ferrule, the feeding system is designed to have relatively high axial stiffness of 600 N/$\mu\textrm{m}$, high angular motion accuracy of 0.5 arcsec/mm in yaw direction and minimum resolution of 0.05 $\mu\textrm{m}$. A prototype of feeding system is built up with hydrostatic guideway and ballscrew. A linear scale with 0.05 $\mu\textrm{m}$ of resolution is used for position feedback. Experimental results show that the feeding system has the infinity of axial stiffness within the range of 1000 N and 0.3 arcsec/mm of yawing error. Also the feeding system shows obvious step response against 0.05 $\mu\textrm{m}$/step command without the lost motion or backlash. Although the vertical stiffness is reduced to 440 N/$\mu\textrm{m}$ by the elastic deformation of rail, it is good enough to use for machining the ferrule. From above, it is confirmed that the feeding system is applicable to centerless grinder for machining the ferrule.

  • PDF