• Title/Summary/Keyword: cheap control

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Cheap Control of Weakly Coupled Discrete System (정규섭동 이산시 시스템에 대한 Cheap 제어 적용)

  • Choi, Won-Ho;Kwon, Yo-Han;Kim, Beom-Soo;Lim, Myo-Teag
    • Proceedings of the KIEE Conference
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    • 1999.11c
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    • pp.503-505
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    • 1999
  • Linear cheap control problem is a special form of linear quadratic regulator problem in which a small parameter ${\varepsilon}^2$ is multiplied with the control term. The joint problem in which cheap control is applied to a weakly coupled discrete system has not been reported in the literature. In this paper, the high-gain problem and decoupling problem on discrete weakly coupled system are considered together. We derive Hamiltonian matrix when the cheap control is applied to a weakly coupled discrete system and use it in developing numerical formulations in the process of applying parallel algorithm to the system.

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Cheap control for a class of nonlinear system

  • Lee, Jie-Tae
    • 제어로봇시스템학회:학술대회논문집
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    • 1987.10a
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    • pp.812-816
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    • 1987
  • A quadratic regulator problem for a class of nonlinear system, in which a small parameter multiplies the control cost, is considered. In the analysis of the problem, we utilize the method of multiple time-scale decomposition which has been devised for analyzing complex linear cheap control problems. In so doing, we extend the class of nonlinear systems, considerably, for which the minimum cost becomes zero as the small parameter goes to zero.

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Robust Controller Design Method for Systems with Parametric Uncertainties

  • Lee, Jietae;Koo, Doe-Gyoon;Thomas F. Edgar
    • Transactions on Control, Automation and Systems Engineering
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    • v.2 no.2
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    • pp.140-148
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    • 2000
  • This paper presents iterative schemes and continuation schemes for designing robust controllers which stabilize dynamic systems having bounded parametric uncertainties. Utilizing results of the cheap control problem, some existence conditions of the robust controller are obtained, which are different from the matching conditions. continuation schemes are used to overcome the divergence problem of iterative schemes. The roust controller design method is extended to nonlinear system ans easily implementable series solution is also obtained. Results are illustrated with simple examples.

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A study on the Regulatory Environment of the French Distribution Industry and the Intermarche's Management strategies

  • Choi, In-Sik;Lee, Sang-Youn
    • The Journal of Industrial Distribution & Business
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    • v.3 no.1
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    • pp.7-16
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    • 2012
  • Despite the enforcement of SSM control laws such as 'the Law of Developing the Distribution Industry (LDDI)' and 'the Law of Promoting Mutual Cooperation between Large and Small/medium Enterprises (LPMC)' stipulating the business adjustment system, the number of super-supermarkets (SSMs) has ever been expanding in Korea. In France, however, Super Centers are being regulated most strongly and directly in the whole Europe viewing that there is not a single SSM in Paris, which is emphasized to be the outcome from French government's regulation exerted on the opening of large scale retail stores. In France, the authority to approve store opening is deeply centralized and the store opening regulation is a socio-economic regulation driven by economic laws whereas EU strongly regulates the distribution industry. To control the French distribution industry, such seven laws and regulations as Commission départementale d'urbanisme commercial guidelines (CDLIC) (1969), the Royer Law (1973), the Doubin Law (1990), the Sapin Law (1993), the Raffarin Law (1996), solidarite et renouvellement urbains (SRU) (2000), and Loi de modernisation de l'économie (LME) (2009) have been promulgated one by one since the amendment of the Fontanet guidelines, through which commercial adjustment laws and regulations have been complemented and reinforced while regulatory measures have been taken. Even in the course of forming such strong regulatory laws, InterMarche, the largest supermarket chain in France, has been in existence as a global enterprise specialized in retail distribution with over 4,000 stores in Europe. InterMarche's business can be divided largely into two segments of food and non-food. As a supermarket chain, InterMarche's food segment has 2,300 stores in Europe and as a hard-discounter store chain in France, Netto has 420 stores. Restaumarch is a chain of traditional family restaurants and the steak house restaurant chain of Poivre Rouge has 4 restaurants currently. In addition, there are others like Ecomarche which is a supermarket chain for small and medium cities. In the non-food segment, the DIY and gardening chain of Bricomarche has a total of 620 stores in Europe. And the car-related chain of Roady has a total of 158 stores in Europe. There is the clothing chain of Veti as well. In view of InterMarche's management strategies, since its distribution strategy is to sell goods at cheap prices, buying goods cheap only is not enough. In other words, in order to sell goods cheap, it is all important to buy goods cheap, manage them cheap, systemize them cheap, and transport them cheap. In quality assurance, InterMarche has guaranteed the purchase safety for consumers by providing its own private brand products. InterMarche has 90 private brands of its own, thus being the retailer with the largest number of distributor brands in France. In view of its IT service strategy, InterMarche is utilizing a high performance IT system so as to obtainas much of the market information as possible and also to find out the best locations for opening stores. In its global expansion strategy of international alliance, InterMarche has established the ALDIS group together with the distribution enterprises of both Spain and Germany in order to expand its food purchase, whereas in the non-food segment, it has established the ARENA group in alliance with 11 international distribution enterprises. Such strategies of InterMarche have been intended to find out the consumer needs for both price and quality of goods and to secure the purchase and supply networks which are closely localized. It is necessary to cope promptly with the constantly changing circumstances through being unified with relevant regions and by providing diversified customer services as well. In view of the InterMarche's positive policy for promoting local partnerships as well as the assistance for enhancing the local economic structure, implications are existing for those retail distributors of our country.

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A Study on the Static Levitation Control of Magnetic Bearing using Optical Fiber Displacement Sensors (광파이버 변위 센서를 적용한 자기베어링 정적 부상 제어 연구)

  • 강종규;신우철;홍준희
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.10a
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    • pp.131-136
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    • 2003
  • Five expensive sensors are necessary to control a magnetic bearing system. The sensor price rate of magnetic bearing system is high. So it is necessary that cheap and good sensor is developed. The optical fiber displacement sensor is adaptive to satisfy this condition. We can design magnetically suspended spindle based on static characteristic of optical fiber displacement sensor developed. The controller can be designed by decoupled feedback PD. Therefore, it is simpler than any other controller comparatively.

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A Study on Precision Control of a Heavy Load Pointing System (대부하 표적지향 시스템의 정밀 제어 기법 연구)

  • Kim Byung-Un;Kang E-Sok
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.9
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    • pp.840-846
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    • 2004
  • In this study, the performance of a heavy load pointing system has been investigated. The PI controller are being widely used in industrial application because of simple, cheap, and excellent performance. However, the requirement for control precision becomes higher and higher, as well as the plants becomes more and more complex. In order to achieve the satisfied control performance, we have to consider the affection of nonlinear factor contained in plant. In this paper, the neural-PI control law have been evaluated. The proposed controller is compared with the existing controllers through simulations, and the results show that the pointing accuracy of the proposed control system is improved against the disturbance induced by vehicle running on the bump course.

The control of maximum power output for a grid-connected wind turbine system by using pitch control method (피치 제어를 이용한 계통연계 풍력발전 시스템의 최대출력 제어)

  • Ryu, Haeng-Soo;Ro, Kyoung-Soo
    • Proceedings of the KIEE Conference
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    • 2001.05a
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    • pp.159-161
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    • 2001
  • This study is for the pitch control of blade, used in most horizontal-axis wind turbine systems, to sustain the maximum power output supplied to grid. The control of a blade can be divided into a stall regulation and a pitch control methods. The stall regulation method using an aerodynamic stall is simple and cheap, but it suffers from fluctuation of the resulting power. Pitch control method is mechanically and mathematically complicated, but the control performance is better than that of the stall regulation method. In this paper 2.5MW MOD-2 wind turbine system is adopted to be controlled by a pitch controller with PI method. The simulation performed by MA TLAB will show the variation of frequency, generator output, and pitch angle.

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Anti-Sway Control of Container Cranes;Inclinometer, Observers, and State Feedback

  • Kim, Yong-Seok;Hong, Keum-Shik;Sul, Seung-Ki
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.1365-1370
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    • 2004
  • In this paper, a novel anti-sway control system that uses an inclinometer as a sway sensor is investigated. The inclinometer, when compared with a vision system, is very cheap, durable, and its maintenance is easy. However, it gives almost the same performance. Various observers for estimating the angular velocity of the load and the trolley velocity are presented. A state feedback controller with an integrator is designed. After a time-scale analysis, a 1/4-size pilot crane of the rail-mounted quayside crane is constructed. The performance of the proposed control system was verified with a real rubber-tired gantry crane at a container terminal as well as with the pilot crane constructed. Experimental results are provided.

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Vibration Contol of Automotive Suspension System using the LQG/LTR Control Methodology (LQG/LTR제어기법을 이용한 자동차 서스펜션 시스템의 진동제어)

  • Ahn, Jeong-Keun;Song, Chang-Hun;Yoo, Sam-Hyeon;Lee, Chong-Won
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.646-653
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    • 2001
  • LQG/LTR Control Methology is recently used for the analysis of multi-variable control in frequency domain. Target filter loop is designed by the demanding requirements such as cross-over frequency, disturbance rejection in low frequency domain, zero steady-state error, identification of maximum and minimum singular values and sensor noise rejection in high frequency domain. Loop transfer recovery is accomplished by solving the cheap control and then simulation close to the target filter loop. In this study, LQG/LTR Control Methodology is applied to the seat suspension system. It is found that this technique is very effective to control the system and improve the ride quality of human body.

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Development of A Omni-directional Flying Robot (전방향 소형비행로봇의 개발)

  • 이호길;원대희;박윤수;양광웅
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.302-305
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    • 2003
  • In this paper, dynamic behaviors of a small-sized flying robot with 4 rotors propelled by DC motor are discussed, and a control scheme based on the dynamic model to make stable flying motions, i.e., hovering, take-off, cruising behavior, etc. is proposed. The experimental results via some flying tests show good performances for practical use. The flying robot with 6DOF is controlled only 4 DOF, and the rest of two DOF are remained under the dynamic constraints. How to give the stability of all positions and orientations and to make the omni-directional motions in spite of such restrictions is analyzed. The proposed control scheme composes of two stages. First, PD control inputs for the trust-force and orientation are calculated, next the control inputs are distributed to each rotor by using a sort of Jacobian matrix. To design and control of a low cost - small sized flying robot, vibrated gyro sensor, cheap accelerometer, IR, and ultra sonic sensors are selected.

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