• Title/Summary/Keyword: Dynamic SET-UP

Search Result 348, Processing Time 0.027 seconds

A Dynamic Set-up Technique for High Accuracy set-up of Continuous Hot Strip Finishing Mill (열간 마무리압연 설정의 정도향상을 위한 동적 설정법)

  • 문영훈;이준정
    • Transactions of Materials Processing
    • /
    • v.5 no.3
    • /
    • pp.232-238
    • /
    • 1996
  • A dynamic mill set-up technique was developed to achieva a more precise roll gap set-up of the finishing mill stands for steel strip rolling. In the conventional mill set-up model the set-up values such as roll gap and roll speed are determined before the sheet bar reached the entry side of the finishing mill train and maintained constant until the strip top end passes through the last stand. In the way however a dynamic set-up logic that gives a way to adjust the roll gap value of the final mill stand for the strip ingoing from the ahead of the front stand was developed and attached to the existing set-up model. The roll gap modification is based on the analysis of the observation in the third stand of the finishing mill train. The dynamic set-up model was proved very effective for the more precise mill set-up and for operational stability in the hot strip finishing mill train.

  • PDF

DYNAMIC SET-UP CONTROL OF TANDEM COLD MILL (연속압연기에서 OFF GAUGE 저감을 위한 DYNAMIC SET-UP 제어기술)

  • 노호섭;최병조;조뇌하;이재훈;김익준;진철제;박기영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 1999.08a
    • /
    • pp.126-131
    • /
    • 1999
  • In order to reduce the length of off-gauge at FGC(Flying gauge change) point, We adopted dynamic set up in No. 4 cold rolling mill. The conventional set-up of FGC(Flying gauge change) was calculated on the basis of preset values in the process control computer, so the difference between actual strip thickness and preset thickness cause long off-gauge. The dynamic SET-UP control was calculated on the basis of actual strip thickness of FGC(Flying gauge change) point from X-ray gauge of mill entry and No.i stand. We applied dynamic SET-UP control in September last year. Compare to the previous result, the length of off-gauge is reduced by about 36%.

  • PDF

The Effects of Set-up Cost Reduction in the Dynamic Lot Size Model and the EOQ model (동적로트크기결정모형과 EOQ모형에 있어서 가동준비비용의 감소효과)

  • ;Lee, Sang Bum
    • Journal of the Korean Operations Research and Management Science Society
    • /
    • v.17 no.3
    • /
    • pp.13-26
    • /
    • 1992
  • Set-up reduction is an important aspect of the Japanese Just-In-Time (JIT) and Zero Inventory (ZI) concepts. In this paper, we first analyze the effects of set-up cost reduction on tatal inventory, average lot size and forecast horizon in the dynamic lot size model. We also examine the various effects of set-up cost reduction in the EOQ model and explain why many Japanese firms try to cut set-up cost and/or set-up time greatly.

  • PDF

Dynamic Control for FMS That Has Unreliable Machines with Set-up (기계고장과 Set-up 을 고려한 FMS 의 동적 통제)

  • 엄완섭;강석호
    • Journal of the Korean Operations Research and Management Science Society
    • /
    • v.17 no.1
    • /
    • pp.43-54
    • /
    • 1992
  • This paper discusses a real time production control system of a FMS (Flexible Manufacturing System). The control is organized in a hierarchical structure according to the various decisions at the different time scales. In the earlier work-set-up time was not considered. Because the capacity of the toll magazine is limited, this assumption may not be adequate for selecting times to change configurations so that new part family can be produced. The goal of the control system is to meet production requirements while the machines fail and are repaired at random times. In this thesis the machien failure and set-up are considered simultaneously. Here the hedging point of this system is calculated, and the formulation of the dynamic control for FMS that has unreliable machines with set-up suggested.

  • PDF

A Study on the Verification of Dynamic Properities on the basis of Vibration Criteria of Isolation Pad (제진대(Isolation Pad)의 진동허용규제치에 기준한 동특성(動特性) 규명에 관한 연구)

  • 백재호;이홍기;서항석
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2001.05a
    • /
    • pp.869-874
    • /
    • 2001
  • In order that precision equipment using high precision industrial operate normally. vibration criteria of expected area that equipment be set up is micrometer level. that method is a trust design for apply to in field, when there attend to quantifiable method. Hence, semi -empirical method that using on the basis of experimental data about undefined information (properities of vibration source, dynamic properities of structure, etc.,) for prediction of vibration response make the use of dynamic structure design of semiconductor & TFT-LCD in the inside and outside country. Like this, for doing an optimal design of dynamic about structure, it is best important to get trust data that apply to semi-empirical method that is method of prediction vibration level. In this paper, on the basis of experimental data which was offered by a manufacturing company Of precisin equipment that plan to set up in semiconductor factory, we predicted vibration response on expected area that equipment be set up.

  • PDF

The Characteristics of the Set-up Effect of Driven Piles (타입 말뚝의 지지력 증가효과 특성)

  • 조천환
    • Journal of the Korean Geotechnical Society
    • /
    • v.19 no.4
    • /
    • pp.235-246
    • /
    • 2003
  • Since the study of Lee et al.(1994) there have been some case studies on the set-up effect of driven piles in Korea country. However, comprehensive examination on the analyses of the set-up effect with various testing data has not been carried out. In particular, the analysis of the influence of soil type and pile shape on the set-up effect has not been reported. It is necessary to analyse the test results of production piles in order to apply the set-up effect of driven piles for the field engineering. In this study some test piling and analyses were performed to give basic information to the piling design as well as the research on the set-up effect in sandy soils. The analyses on the set-up effect were performed with the monitoring data obtained from the high-strain dynamic loading tests. It was shown that the set-up effect of driven piles was not only affected by soil type but also by soil formation history It turned out that the set-up effect in sandy soils was considerable one that should not be ignored in the field, and that the bearing capacity increase of pile is mainly caused by the increase of shaft resistance. It was shown that the set-up effect of closed pile was larger than that of opened pile in clayey soils, while the set-up effect of opened pile was larger than that of closed pile in sandy soils.

Optimum Design of Integer and Fractional-Order PID Controllers for Boost Converter Using SPEA Look-up Tables

  • Amirahmadi, Ahmadreza;Rafiei, Mohammadreza;Tehrani, Kambiz;Griva, Giovanni;Batarseh, Issa
    • Journal of Power Electronics
    • /
    • v.15 no.1
    • /
    • pp.160-176
    • /
    • 2015
  • This paper presents a method of designing optimal integer- and fractional-order proportional-integral-derivative (FOPID) controllers for a boost converter to gain a set of favorable characteristics at various operating points. A Pareto-based multi-objective optimization approach called strength Pareto evolutionary algorithm (SPEA) is used to obtain fast and low overshoot start-up and dynamic responses and switching stability. The optimization approach generates a set of optimal gains called Pareto set, which corresponds to a Pareto front. The Pareto front is a set of optimal results for objective functions. These results provide designers with a trade-off look-up table, in which they can easily choose any of the optimal gains based on design requirements. The SPEA also overcomes the difficulties of tuning the FOPID controller, which is an extension to the classic integer-order PID controllers and potentially promises better results. The proposed optimized FOPID controller provides an excellent start-up response and the desired dynamic response. This paper presents a detailed comparison of the optimum integer- and the fractional-order PID controllers. Extensive simulation and experimental results prove the superiority of the proposed design methodology to achieve a wide set of desired technical goals.

Track Irregularity Inspection Method for Commercial Vehicle (영업차량에서의 궤도비틀림 검측 방안 연구)

  • Lee Chan-Woo;Choi Eun-Young
    • Proceedings of the KSR Conference
    • /
    • 2003.05a
    • /
    • pp.768-773
    • /
    • 2003
  • The inspection of track irregularity, which is the most important index for the evaluation of the dynamic safety of the rolling stock, is performed by setting up the testing train set. The self-diagnosis for the various rolling stocks and railways can be obtained if it is possible to take the simultaneous inspection of track irregularity for the commercial vehicle while it is running and to build up a dynamic safety evaluation system. It is expected to have some good effects, such as preventing accident with the low dynamic safety, cutting cost for the testing train set and evaluating the exact influence on the rolling stock and railway. In this study, innertial measuring method, which allows us to directly measure the track irregularity from the commercial vehicle, will be considered and some overseas cases will be explored as well.

  • PDF

Consideration of Set-up Effect in Wave Equation Analysis of Pile Driving. (Set-up 효과를 반영한 타입말뚝의 파동이론해석)

  • 천병식;조천환
    • Journal of the Korean Geotechnical Society
    • /
    • v.15 no.2
    • /
    • pp.95-104
    • /
    • 1999
  • The bearing capacity of piles driven in soils showing set-up tendency increases with time. Though WEAP is an excellent tool for evaluating the driveability of driven pile, it has some limitations to predict reliable bearing capacity of pile after driving. It is because the existing WEAP method cannot take into account time-dependent soil properties after driving. The set-up effect should be accounted for to obtain a reliable bearing capacity by the WEAP. Unfortunately, there are no sufficient methods to take the set-up effect into consideration in wave equation analysis. This paper suggests an alternative to consider time effect in wave equation analysis through statistical analysis of dynamic load test data both at the end of driving and in the beginning of restrike. It is shown that the suggested parameters(quake and damping) would be more reliable than the existing one for the wave equation analysis of driven piles.

  • PDF

A Study on the DRF Multipath Multistage Interconnection Network (DRF 다단상호접속망에 관한 연구)

  • Lee, Eun-Seol;Lim, Chae-Tak
    • Journal of the Korean Institute of Telematics and Electronics
    • /
    • v.27 no.10
    • /
    • pp.130-137
    • /
    • 1990
  • The multipath multistage interconnection network is proposed which has the capability of dynamic rerouting. Construction of the network gets simpler, and the number of stages is reduced to $LOG_{2}$(N), so hardware complexity is reduced. This proposed algorithm makes it possible that destination adresses are used as routing tags, and it is easy to set up the path. Because this proposed network has a dynamic rerouting, backtracking is not necessary to set up another path when conflicts of switch faults are occurred. To estimate a performance, analytic methods are used and it is proved that probability of acceptance is improved in this Multipath MIN.

  • PDF