• Title/Summary/Keyword: RCGA(Real-coded genetic algorithm)

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A study on the optimal tuning of the hydraulic motion driver parameter by using RCGA (유압 모션 제어기의 최적 제어인자 튜닝에 관한 연구)

  • Shin, Suk-Shin;Noh, Jong-Ho;Park, Jong-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.1
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    • pp.39-47
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    • 2014
  • In this study, 2 degree of freedom PID controller is added to the conventional feed-forward controller for the purpose of improving its limitations such as set-point of tracking performance and disturbance suppression performance in the conventional PID controller. And the controller parameters optimization as a Real Coded Genetic Algorithm (RCGA) is used. Simulation and experiments verify the performance of the controller.

RCGA-Based Tuning of the 2DOF PID Controller (2자유도 PID 제어기의 RCGA기반 동조)

  • Hwang, Seung-Wook;Song, Se-Hoon;Kim, Jung-Keun;Lee, Yun-Hyung;Lee, Hyun-Shik;Jin, Gang-Gyoo
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.9
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    • pp.948-955
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    • 2008
  • The conventional PID controller has been widely employed in industry. However, the PID controller with one degree of freedom(DOF) can not optimize both set-point tracking response and disturbance rejection response at the same time. In order to solve this problem, a few types of 2DOF PID controllers have been suggested. In this paper, a tuning formula for a 2DOF PID controller is presented. The optimal parameter sets of the 2DOF PID controller are determined based on the first-order plus time delay process and a real-coded genetic algorithm(RCGA) such that the ITAE performance criterion is minimized. The tuning rule is then addressed using calculated parameter sets and another RCGA. A set of simulation works are carried out on three processes with time delay to verify the effectiveness of the proposed rule.

Combined Economic and Emission Dispatch with Valve-point loading of Thermal Generators using Modified NSGA-II

  • Rajkumar, M.;Mahadevan, K.;Kannan, S.;Baskar, S.
    • Journal of Electrical Engineering and Technology
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    • v.8 no.3
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    • pp.490-498
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    • 2013
  • This paper discusses the application of evolutionary multi-objective optimization algorithms namely Non-dominated Sorting Genetic Algorithm-II (NSGA-II) and Modified NSGA-II (MNSGA-II) for solving the Combined Economic Emission Dispatch (CEED) problem with valve-point loading. The valve-point loading introduce ripples in the input-output characteristics of generating units and make the CEED problem as a non-smooth optimization problem. IEEE 57-bus and IEEE 118-bus systems are taken to validate its effectiveness of NSGA-II and MNSGA-II. To compare the Pareto-front obtained using NSGA-II and MNSGA-II, reference Pareto-front is generated using multiple runs of Real Coded Genetic Algorithm (RCGA) with weighted sum of objectives. Furthermore, three different performance metrics such as convergence, diversity and Inverted Generational Distance (IGD) are calculated for evaluating the closeness of obtained Pareto-fronts. Numerical results reveal that MNSGA-II algorithm performs better than NSGA-II algorithm to solve the CEED problem effectively.

System Identification by Real-Coded Genetic Algorithm (실수코딩 유전알고리즘을 이용한 시스템 식별)

  • Ahn, Jong-Kap;Lee, Yun-Hyung;Jin, Gang-Gyoo;So, Myung-Ok
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.5
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    • pp.599-605
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    • 2007
  • This paper presents a method for identifying various systems based on input-output data and a real-coded genetic algorithm(RCGA). The advantages of this technique are, first, it is not dependent on the deterministic or stochastic nature of the systems and, second, the globally optimized models for the original systems can be identified without the need of a differentiable measure function of linearly separable parameters. Under suitable hypotheses, the estimation error is shown to converge in probability to zero. The performance of the proposed algorithm is demonstrated through several simulations.

PID Controller Tuning Rules for Integrating Processes with Time Delay (시간지연을 갖는 적분시스템용 PID 제어기의 동조규칙)

  • Lee, Yun-Hyung;So, Myung-Ok;Hwang, Seung-Wook;Ahn, Jong-Kap;Kim, Min-Jung;Jin, Gang-Gyoo
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.6
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    • pp.753-759
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    • 2006
  • Integrating processes are frequently encountered in process industries. In this paper, new tuning formulae of the PID controllers for set-point tracking and load disturbance rejection are presented for integrating processes involving time delay. First, the controller parameter sets are tuned using a real-coded genetic algorithm (RCGA) such that performance criterion(IAE, ISE or ITSE) is minimized. Then, tuning rules are addressed using tuned PID parameter sets. tuning model and another RCGA. The performances of the proposed rules are tested on two processes.

RCGA-Based Optimal Speed Control of Marine Diesel Engine (RCGA에 기초한 선박 디젤 엔진의 최적 속도제어)

  • So, Myung-Ok;Lee, Yun-Hyung;Ahn, Jong-Kap;Jin, Gang-Gyoo;Cho, Kwon-Hae
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.268-273
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    • 2005
  • The conventional PID controller has been widely used in many industrial control system because engineers can easily understand how to deal with three parameters of PID controller. The conventional tuning methods, however, have a tendency depend on experience and experiment. In this paper a real-coded genetic algorithm is used to search for the optimal parameters of PID controller for marine diesel engine. Simulation results compared with conventional PID controller tuning methods show the effectiveness and good performance of proposed scheme.

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Multiple Defect Diagnostics of Gas Turbine Engine using Real Coded GA and Artificial Neural Network (실수코드 유전알고리즘과 인공신경망을 이용한 가스터빈 엔진의 복합 결함 진단 연구)

  • Seo, Dong-Hyuck;Jang, Jun-Young;Roh, Tae-Seong;Choi, Dong-Whan
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.11a
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    • pp.23-27
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    • 2008
  • In this study, Real Coded Genetic Algorithm(RCGA) and Artificial Neural Network(ANN) are used for developing the defect diagnostics of the aircraft turbo-shaft engine. ANN accompanied with large amount data has a most serious problem to fall in the local minima. Because of this weak point, it becomes very difficult to obtain good convergence ratio and high accuracy. To solve this problem, GA based ANN has been suggested. GA is able to search the global minima better than ANN. GA based ANN has shown the RMS defect error of 5% less in single and dual defect cases.

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Tracking and Stabilization of a NV System for Marine Surveillance (해상감시용 NV 시스템의 추종 및 안정화)

  • Hwang, Seung-Wook;Kim, Jung-Keun;Song, Se-Woon;Jin, Gang-Gyoo
    • Journal of Navigation and Port Research
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    • v.35 no.3
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    • pp.227-233
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    • 2011
  • This paper presents the tracking and stabilization problem of a night vision system for marine surveillance. Both a hardware system and software modules are developed to control azimuth and elevation axes independently with compensation for ship motion. A two degree of freedom(2DOF) PID controller is designed and its parameters are tuned using a real-coded genetic algorithm(RCGA). Simulation demonstrates the effectiveness of the proposed method.

Intelligent fuzzy inference system approach for modeling of debonding strength in FRP retrofitted masonry elements

  • Khatibinia, Mohsen;Mohammadizadeh, Mohammad Reza
    • Structural Engineering and Mechanics
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    • v.61 no.2
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    • pp.283-293
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    • 2017
  • The main contribution of the present paper is to propose an intelligent fuzzy inference system approach for modeling the debonding strength of masonry elements retrofitted with Fiber Reinforced Polymer (FRP). To achieve this, the hybrid of meta-heuristic optimization methods and adaptive-network-based fuzzy inference system (ANFIS) is implemented. In this study, particle swarm optimization with passive congregation (PSOPC) and real coded genetic algorithm (RCGA) are used to determine the best parameters of ANFIS from which better bond strength models in terms of modeling accuracy can be generated. To evaluate the accuracy of the proposed PSOPC-ANFIS and RCGA-ANFIS approaches, the numerical results are compared based on a database from laboratory testing results of 109 sub-assemblages. The statistical evaluation results demonstrate that PSOPC-ANFIS in comparison with ANFIS-RCGA considerably enhances the accuracy of the ANFIS approach. Furthermore, the comparison between the proposed approaches and other soft computing methods indicate that the approaches can effectively predict the debonding strength and that their modeling results outperform those based on the other methods.

Design of RCGA-based PID controller for two-input two-output system

  • Lee, Yun-Hyung;Kwon, Seok-Kyung;So, Myung-Ok
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.10
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    • pp.1031-1036
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    • 2015
  • Proportional-integral-derivative (PID) controllers are widely used in industrial sites. Most tuning methods for PID controllers use an empirical and experimental approach; thus, the experience and intuition of a designer greatly affect the tuning of the controller. The representative methods include the closed-loop tuning method of Ziegler-Nichols (Z-N), the C-C tuning method, and the Internal Model Control tuning method. There has been considerable research on the tuning of PID controllers for single-input single-output systems but very little for multi-input multi-output systems. It is more difficult to design PID controllers for multi-input multi-output systems than for single-input single-output systems because there are interactive control loops that affect each other. This paper presents a tuning method for the PID controller for a two-input two-output system. The proposed method uses a real-coded genetic algorithm (RCGA) as an optimization tool, which optimizes the PID controller parameters for minimizing the given objective function. Three types of objective functions are selected for the RCGA, and each PID controller parameter is determined accordingly. The performance of the proposed method is compared with that of the Z-N method, and the validity of the proposed method is examined.