• Title/Summary/Keyword: Multi-output

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Robust Adaptive Output Feedback Control Design for a Multi-Input Multi-Output Aeroelastic System

  • Wang, Z.;Behal, A.;Marzocca, P.
    • International Journal of Aeronautical and Space Sciences
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    • v.12 no.2
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    • pp.179-189
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    • 2011
  • In this paper, robust adaptive control design problem is addressed for a class of parametrically uncertain aeroelastic systems. A full-state robust adaptive controller was designed to suppress aeroelastic vibrations of a nonlinear wing section. The design used leading and trailing edge control actuations. The full state feedback (FSFB) control yielded a global uniformly ultimately bounded result for two-axis vibration suppression. The pitching and plunging displacements were measurable; however, the pitching and plunging rates were not measurable. Thus, a high gain observer was used to modify the FSFB control design to become an output feedback (OFB) design while the stability analysis for the OFB control law was presented. Simulation results demonstrate the efficacy of the multi-input multi-output control toward suppressing aeroelastic vibrations and limit cycle oscillations occurring in pre- and post-flutter velocity regimes.

Temperature Control of Ultrasupercritical Once-through Boiler-turbine System Using Multi-input Multi-output Dynamic Matrix Control

  • Moon, Un-Chul;Kim, Woo-Hun
    • Journal of Electrical Engineering and Technology
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    • v.6 no.3
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    • pp.423-430
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    • 2011
  • Multi-input multi-output (MIMO) dynamic matrix control (DMC) technique is applied to control steam temperatures in a large-scale ultrasupercritical once-through boiler-turbine system. Specifically, four output variables (i.e., outlet temperatures of platen superheater, finish superheater, primary reheater, and finish reheater) are controlled using four input variables (i.e., two spray valves, bypass valve, and damper). The step-response matrix for the MIMO DMC is constructed using the four input and the four output variables. Online optimization is performed for the MIMO DMC using the model predictive control technique. The MIMO DMC controller is implemented in a full-scope power plant simulator with satisfactory performance.

Design of Multi-Input Multi-Output Positive Position feedback Controller based on Block-Inverse Technique (블록 역행렬 기법에 의한 다중입출력 양변위 되먹임제어기의 설계)

  • Kwak, Moon-K.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.05a
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    • pp.508-514
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    • 2005
  • This paper is concerned with the active vibration control of a grid structure equipped with piezoceramic sensors and actuators. The grid structure is a replica of the solar panel commonly mounted on satellites, which contains complex natural mode shapes. The multi input and multi output positive position feedback controller is considered as an active vibration controller for the grid structure. A new concept, the block-inverse technique, is proposed to cope with more modes than the number of actuators and sensors. This study also deals with the stability and the spillover effect associated with the application of the multi-input multi-output positive position feedback controller based on the block inverse technique. It was found that the theories developed in this study are capable of predicting the control system characteristics and its performance. The new multi-input multi-output positive position feedback controller was applied to the test structure using a digital signal processor and its efficacy was verified by experiments..

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Design of Multi-input Multi-output Positive Position Feedback Controller Based on Block-inverse Technique (블록 역행렬 기법에 의한 다중입출력 양변위 되먹임제어기의 설계)

  • Kwak, Moon K.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.9 s.102
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    • pp.1037-1044
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    • 2005
  • This paper is concerned with the active vibration control of a grid structure equipped with piezoceramic sensors and actuators. The grid structure is a replica of the solar panel commonly mounted on satellites, which contains complex natural mode shapes. The multi-input and multi-output positive position feedback controller is considered as an active vibration controller for the grid structure. A new concept, the block-inverse technique, is proposed to cope with more modes than the number of actuators and sensors. This study also deals with the stability and the spillover effect associated with the application of the multi-input multi-output positive position feedback controller based on the block-inverse technique. It was found that the theories developed in this study are capable of predicting the control system characteristics and its performance. The new multi-input multi-output positive position feedback controller was applied to the test structure using a digital signal processor and its efficacy was verified by experiments.

A Maximum Likelihood Decoding Scheme Based on Breadth-First Searching for Multi-Input Multi-Output Systems (여러 입력 여러 출력 시스템에 알맞도록 너비를 먼저 탐색하는 가장 비슷함 복호 방식)

  • Kang, Hyun-Gu;Song, Iick-Ho;An, Tae-Hun;Kim, Yun-Hee
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.1C
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    • pp.34-42
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    • 2007
  • The sphere decoder (SD) has recently been proposed to perform maximum likelihood (ML) decoding for multi-input multi-output systems. Employing a 'breadth-first' searching algorithm for closet points in a lattice, we propose a novel ML decoding scheme for multi-input multi-output systems. Simulation results show that the proposed scheme has the same bit error rate performance as the conventional ML decoders while allowing significantly lower computational burden than the SD.

Decentralized Input-Output Feedback Linearizing Control for a Multi-Machine Power System using Output Modification (수정된 출력을 이용한 다기 전력 계통의 분살 입출력 되먹임 선형화 제어)

  • Jee, Hwang;Yoon, Tae-Woong;Kim, Seok-Kyoon
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.291-294
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    • 2006
  • This paper presents a decentralized input-output feedback linearizing controller for a multi-machine power system. Firstly, the controller is designed using input-output feedback linearization for modified outputs. Then we present a guideline for selecting gains of the controller and parameters in the modified outputs. Simulations illustrate the effectiveness of the proposed control scheme and the selection guideline.

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A Study on Output Voltage Stabilization of 20W Class Multi-output QR Flyback Converter for Auxiliary Power (20W급 보조전원용 다출력 QR 플라이백 컨버터의 출력전압 안정화에 관한 연구)

  • Yoo, Jeong Sang;Gil, Yong Man;Kim, Hyun Bae;Ahn, Tae Young
    • Journal of the Semiconductor & Display Technology
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    • v.20 no.3
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    • pp.157-160
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    • 2021
  • In this paper, a 20W class multi-output QR flyback converter for auxiliary power supply was designed to stabilize 4 output voltages, and the efficiency and load characteristics were compared and analyzed. It was checked if each output affects other output characteristics through experiment. As a result, the experimental circuit reached a high efficiency of 82.5% or more at a load power of over 20W, and the maximum power loss was 2.6W. Consequently, it was confirmed that all of 4 output voltages of the multi-output QR flyback converter constructed in this paper were stabilized within 0.5% in full-load range, and each output was independently controlled in an electrically isolated state.

Multi-level PWM Inverter Considering the number of Output Voltage level and Current rating (출력전압 레벨 수와 전류정격을 고려한 PWM 다중레벨 인버터)

  • Park, N.S.;Seo, J.J.;Park, S.J.;Kim, K.H.;Cho, S.E.;Kim, C.U.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.659-662
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    • 2005
  • In this paper, we proposed the novel hybrid multi-level inverter using combination of the output voltage of transformers to reduce the THD(Total Harmonic Distortion) and improve the waveform of output voltage. The proposed multi-level inverter used the output of transformer which is 1times, 2times, 4times of input of the transformers. So we increased the output voltage from the reduce the number of switching component and transformer. Also, we tested the proposed prototype 15-level inverter to clarify the proposed electric circuit and reasonableness of control signal for the proposed multi -level PWM inverter.

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An Analysis of Multi-processor System Performance Depending on the Input/Output Types (입출력 형태에 따른 다중처리기 시스템의 성능 분석)

  • Moon, Wonsik
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.12 no.4
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    • pp.71-79
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    • 2016
  • This study proposes a performance model of a shared bus multi-processor system and analyzes the effect of input/output types on system performance and overload of shared resources. This system performance model reflects the memory reference time in relation to the effect of input/output types on shared resources and the input/output processing time in relation to the input/output processor, disk buffer, and device standby places. In addition, it demonstrates the contribution of input/output types to system performance for comprehensive analysis of system performance. As the concept of workload in the probability theory and the presented model are utilized, the result of operating and analyzing the model in various conditions of processor capability, cache miss ratio, page fault ratio, disk buffer hit ratio (input/output processor and controller), memory access time, and input/output block size. A simulation is conducted to verify the analysis result.

Multi-Output LLC Resonant Converter (다 출력 LLC 공진 컨버터)

  • Kang, Seong-In;Kim, Joo-Hoon;Kim, Eun-Soo;Park, Jun-Ho;Lee, Jae-Sam;Huh, Dong-Young
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.4
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    • pp.323-332
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    • 2009
  • In this paper, operating characteristics of multi-output LLC resonant converter are described and analyzed. Especially, voltage gain characteristics and an equivalent resonant frequency in the multi-output LLC resonant converter are changed by the influences due to the several load conditions and the secondary leakage inductances of multi-output transformer. Based on the theoretical analysis and simulation results considered the characteristics of voltage gain and load variation, prototype of the 540W 3-output LLC resonant converter for 42 inch PDP TV power module is built and the experimental results are described.