• 제목/요약/키워드: advanced process control

검색결과 891건 처리시간 0.031초

연속식 가열로의 Level 2 제어 시스템 설계 (Design of Level 2 Control System for Continuous Reheat Furnaces)

  • 유보현;이재용;임동렬;차재민;염충섭
    • 시스템엔지니어링학술지
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    • 제12권1호
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    • pp.113-120
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    • 2016
  • Steel in a continuous reheat furnace is heated to higher temperature to be treated in the rolling steel process. Due to this reason the continuous reheat furnace system requires an optimal control system to adjust the temperature inside the furnace. Level 2 control systems for continuous reheat furnaces generate automatic heating set points for the level 1 system of the furnace based on the mathematical thermal model which can give a good estimation of steel heating inside the furnace and is used to adjust heating requirements to optimize furnace combustion. For the current study the analytic methodology based on the design procedure from the systems engineering to develop new level 2 control system of a continuous reheat furnace was proposed. The system analysis and the requirements of the level 2 control system were derived using the unified modeling language (UML) 2.0, and the design of database and the graphic user interface (GUI) for the level 2 control system were conducted.

Novel Partitioning Algorithm for a Gaussian Inverse Wishart PHD Filter for Extended Target Tracking

  • Li, Peng;Ge, Hongwei;Yang, Jinlong
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제11권11호
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    • pp.5491-5505
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    • 2017
  • Use of the Gaussian inverse Wishart PHD (GIW-PHD) filter has demonstrated promise as an approach to track an unknown number of extended targets. However, the partitioning approaches used in the GIW-PHD filter, such as distance partition with sub-partition (DP-SP), prediction partition (PP) and expectation maximization partition (EMP), fails to provided accurate partition results when targets are spaced closely together and performing maneuvers. In order to improve the performance of a GIW-PHD filter, this paper presents a cooperation partitioning (CP) algorithm to solve the partitioning issue when targets are spaced closely together. In the GIW-PHD filter, the DP-SP is insensitive to target maneuvers but sensitive to the differences in target sizes, while EMP is the opposite. The proposed CP algorithm is a fusion approach of DP-SP and EMP, which employs EMP as a sub-partition approach after DP. Therefore, the CP algorithm will be sensitive to neither target maneuvers nor differences in target sizes. The simulation results show that the use of the proposed CP algorithm will improve the performance of the GIW-PHD filter when targets are spaced closely together.

고성능 전자식 안정기에 적합한 공진형 인버터의 혼합형 구동방식과 제어 IC (Mixed mode exciting resonant inverter and control IC applicable to high Performance electronic ballast)

  • 류태하;채균;황종태;조규형
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 F
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    • pp.2786-2788
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    • 1999
  • In this paper, a mixed mode exciting resonant inverter topology applicable to high performance electronic ballast is presented. Mixed mode exciting technique combines the attractive features of self exciting resonant inverter with those of external exciting one. The control IC is designed and manufactured by using a 0.8um CMOS process for 5V operation and has only 8 pins. This performs the operations of filament preheating, dimming control, output power regulation and protections. The mixed mode exciting resonant inverter with control IC has very simple structure, high performance and expensive manufacturing cost.

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Dissolved oxygen concentration regulation using auto-tuning PID controller in fermentation process

  • Hwang, Young-Bo;Lee, Seung-Chul;Chang, Ho-Nam;Chang, Yong-Keun
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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    • pp.790-794
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    • 1989
  • A novel control method involving an automatic tuning of digital PID controller parameters has been developed for better regulation of DO (dissolved oxygen) concentration in batch fermentation processes. Heuristic reasoning allows the PID controller to reach improved tuning decisions based upon the supervision of certain control performance indices in the same cognitive manner as in an expert control.

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비행제어법칙 설계 및 해석 절차에 관한 연구 (A Study on the Control Law Design and Analysis Process)

  • 황병문;조인제;김종섭
    • 제어로봇시스템학회논문지
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    • 제11권11호
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    • pp.913-919
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    • 2005
  • An advanced method of Relaxed Static Stability (RSS) is utilized for improving the aerodynamic performance of modem version supersonic jet fighter aircraft. The flight control system utilizes RSS criteria in both longitudinal and lateral-directional axes to achieve performance enhancements and improve stability. Standard CLDA (Control Law Design and Analysis) process is provided that reduce the development period of the flight control system. In addition, if this process is employed in developing flight control laws, it reduces the trial and error development and verification of control laws. This paper details the design process of developing a flight control law for the RSS aircraft, utilizing military specifications, linear and nonlinea, analysis using XMATH and ATLAS(Aircraft, Tim Linear and Simulation), handling quality tests using the HQS (Handling Quality Simulator), and real flight test results to verify aircraft dynamic flight responses.

Fe-7%Mn 합금의 오스테나이트 안정성에 미치는 밀링 시간과 공정제어제 첨가 효과 (Effect of Milling Time and Addition of PCA on Austenite Stability of Fe-7%Mn Alloy)

  • 오승진;손인진;이석재
    • 한국분말재료학회지
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    • 제25권2호
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    • pp.126-131
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    • 2018
  • In the present study, we investigate the effects of milling time and the addition of a process control agent (PCA) on the austenite stability of a nanocrystalline Fe-7%Mn alloy by XRD analysis and micrograph observation. Nanocrystalline Fe-7%Mn alloys samples are successfully fabricated by spark plasma sintering. The crystallite size of ball-milled powder and the volume fraction of austenite in the sintered sample are calculated using XRD analysis. Changes in the shape and structure of alloyed powder according to milling conditions are observed through FE-SEM. It is found that the crystallite size is reduced with increasing milling time and amount of PCA addition due to the variation in the balance between the cold-welding and fracturing processes. As a result, the austenite stability increased, resulting in an exceptionally high volume fraction of austenite retained at room temperature.

Effect of Initial (Reference) Welding Current for Adaptive Control and It's Optimization to Secure Proper Weld Properties in Resistance Spot Welding

  • Ashadudzzaman, Md.;Choi, Il-Dong;Kim, Jae-Won;Nam, Dae-Geun;Park, Yeong-Do
    • Journal of Welding and Joining
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    • 제33권6호
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    • pp.13-20
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    • 2015
  • Many automotive companies are endeavoring to improve the quality of resistance spot welding by updating body-in-white (BIW) production line with adaptive control spot welding system to compensate the process disturbances such as gap, electrode wear, oxidized surfaces, poor fit up and adhesive etc. Most of the commercial adaptive weld controllers require proper "Initial Welding Schedule" or "Reference weld" to achieve compensation in welding parameters during real time welding. In this study, the compensation of a commercial adaptive weld controller had been observed and analyzed thoroughly for various process disturbances to find optimal initial welding schedule. It was observed that 90 percent of the expulsion current in constant current control as reference welding schedule conferred the maximum button diameter in adaptive control welding. Finally, effects of each disturbance in combined field disturbances system with adaptive control had also been confirmed with the design of experiment (DOE) by minitab(R)16 for combined disturbances situation and suitability of optimum initial weld current had also established with real body part validation test.

노후된 알루미늄 압출기의 재제조 기술 개발 및 성능 개선 (Development and Performance Improvement of old Aluminum Extruder Remanufacturing Technology)

  • 윤상민;정항철;공만식
    • 한국산업융합학회 논문집
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    • 제26권1호
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    • pp.95-103
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    • 2023
  • The domestic remanufacturing industry is concentrated in auto parts, so it is necessary to expand into various industries. In the domestic aluminum industry, the extrusion process accounts for more than 40% of the total, but the old and management of the extrusion equipment is not done properly. In particular, the extruder has a structure in which equipment is not replaced until major parts are damaged or worn, so there are problems such as lower process precision, productivity and production efficiency compared to new equipment, and high maintenance costs. In this study, the old extruder was remanufactured for major high-risk parts through Failure Mode and Effect Analysis(FMEA), and the process level and performance of the extruder were evaluated before and after remanufacturing. Compared to the existing extruder, the standard deviation of the remanufacture extruder was reduced by 93.5%, 57.9%, and 70.0%, respectively, in major process control items such as container temperature, billet temperature, and ram speed, keeping performance constant. In addition, it was possible to produce products with complex shapes that could not be produced before due to problems such as dimensional deviation within tolerances. In this study, remanufacturing guidelines were presented by analyzing the effect of failure modes of the old extruder, and the performance improvement of the extruder was confirmed.

전해조 공정의 고급제어에 관한 연구 (A study on advanced control of electrolyzer process)

  • 이종구;박선원;문상봉
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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    • pp.76-80
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    • 1991
  • This paper presents a merit of feedforward Dyamic Matrix Control(DMC) for electrolyzer process. The electrolyzer consists of anode part and cathode part that are separated by ion membrane. As the electolyzer process consumes a large amount of electricity, electric power change is inevitable in order to take advantage of the cheaper electricity during night. But the electric power change makes the electrolyzer control difficult because the electric power change affect the dynamics of the process. Feedforward DMC treats the electric power change as a load disturbance and gives the weighting value to the disturbance prediction part in the DMC algorithm. Feedforward DC shows better regulation performance than PID control and feedforward-feedback control for electrolyzer process.

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복합대기오염 저감 시스템을 위한 오존 고속산화 기반 고도산화공정 (An Ozone-based Advanced Oxidation Process for an Integrated Air Pollution Control System)

  • 엄성현;홍기훈;황상연
    • 공업화학
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    • 제32권3호
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    • pp.237-242
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    • 2021
  • 미세먼지와 함께 질소산화물, 황산화물, 휘발성 유기화합물, 암모니아 비롯한 유발물질에 대한 동시 저감기술은 엄격해지는 환경규제와 실질적인 저감효과 제고를 위해 꾸준히 주목받아 왔다. 오존산화에 의한 비수용성 질소산화물 고속산화 공정은 전통적으로 적용되고 있는 선택적 촉매환원 공정에 비해 공간절약형 시스템 적용을 가능하게 할 뿐만 아니라 운영비용 절감 측면에서 매우 효과적인 방법으로 평가되고 있으며 황산화물을 비롯한 산성가스와 동시 저감이 가능한 공정 구현이 가능하다는 장점까지 있다. 본 논문에서는 오존 고속산화 공정에 대한 기술 이슈 및 개발 동향을 소개하며 향후 산업적 이용 확대를 위한 개발 방향에 대해서 고찰하고자 한다.