• Title/Summary/Keyword: hybrid control structure

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Vibration Control of a Building Structure with a Tuned Liquid Damper Using Real-Time Hybrid Experimental Method (실시간 하이브리드 실험법을 이용한 동조액체댐퍼가 설치된 건물의 진동제어)

  • Lee Sung-Kyung;Lee Sang-Hyun;Min Kyung-Won;park Eun-Churn;Woo Sung-Sik;Chung Lan
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2006.04a
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    • pp.256-263
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    • 2006
  • In this paper, an experimental hybrid method, which implements the earthquake response control of a building structure with a TLD(Tuned Liquid Damper) by using only a TLD as an experimental part, is proposed and is experimentally verified through a shaking table test. In the proposed methodology, the whole building structure with a TLD is divided into the upper TLD and the lower structural parts as experimental and numerical substructures, respectively. At the moment, the control force acting between their interface is measured from the experimental TLD with shear-type load-cell which is mounted on shaking table. Shaking table vibrates the upper experimental TLD with the response calculated from the numerical substructure, which is subjected to the excitations of the measured interface control force at its top story and an earthquake input at its base. The experimental results show that the conventional method, in which both a TLD and a building structure model are physically manufactured and are tested, can be replaced by the proposed methodology with a simple experimental installation and a good accuracy for evaluating the control performance of a TLD.

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Fuzzy hybrid control of a wind-excited tall building

  • Kang, Joo-Won;Kim, Hyun-Su
    • Structural Engineering and Mechanics
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    • v.36 no.3
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    • pp.381-399
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    • 2010
  • A fuzzy hybrid control technique using a semi-active tuned mass damper (STMD) has been proposed in this study for mitigation of wind induced motion of a tall building. For numerical simulation, a third generation benchmark is employed for a wind-excited 76-story building. A magnetorheological (MR) damper is used to compose an STMD. The proposed control technique employs a hierarchical structure consisting of two lower-level semi-active controllers (sub-controllers) and a higher-level fuzzy hybrid controller. Skyhook and groundhook control algorithms are used as sub-controllers. When a wind load is applied to the benchmark building, each sub-controller provides different control commands for the STMD. These control commands are appropriately combined by the fuzzy hybrid controller during realtime control. Results from numerical simulations demonstrate that the proposed fuzzy hybrid control technique can effectively reduce the STMD motion as well as building responses compared to the conventional hybrid controller. In addition, it is shown that the control performance of the STMD is superior to that of the sample TMD and comparable to an active TMD, but with a significant reduction in power consumption.

Intelligent Hybrid Modular Architecture for Multi Agent System

  • Lee, Dong-Hun;Baek, Seung-Min;Kuc, Tae-Yong;Chung, Chae-Wook
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.896-902
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    • 2004
  • The purpose of the study of multi-robot system is to realize multi-robot system easy for the control of robot system in case robot is adapted in the complicated environment of task structure. The purpose of the study of multi-robot system is to realize multi-robot system easy for the control of robot system in case robot is adapted in the complicated environment of task structure. To make real time control possible by making effective use of recognized information in this dynamic environment, suitable distribution of tasks should be made in consideration of function and role of each performing robots. In this paper, IHMA (Intelligent Hybrid Modular Architecture) of Intelligent combined control architecture which utilizes the merits of deliberative and reactive controllers will be suggested and its efficiency will be evaluated through the adaptation of control architecture to representative multi-robot system.

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A Study on Photovoltaic/Wind/Diesel Hybrid Power System

  • Jeong, Byung-Hwan;Cho, Jun-Seok;Gho, Jae-Seok;Choe, Gyu-Ha;Kim, Eung-Sang;Lee, Chang-Sung
    • Journal of Power Electronics
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    • v.3 no.1
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    • pp.40-48
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    • 2003
  • In this paper, a hybrid power system with photovoltaic/wind/diesel generators is proposed to solve the defect of stand-alone type power system in a remote area. A hybrid power system has a power-balanced controller to equilibrate generation power with a given load demand and which is composed of common DC power system. To execute a power-balanced control, a hybrid power system is assumed that all of power generators have the characteristics of an equivalent current-source and load sharing control technique must be needed at the same time. So this paper discusses the structure of power-balance control for hybrid power system. And through the results of simulation, the proposed scheme was verified.

Vibration Control of Hvbrid Smart Structure Using PZT Patches and ER Fluids (PZT와 ER유체를 적용한 복합지능구조물의 진동제어)

  • Yun, Shin-Il;Park, Keun-Hyo;Han, Sang-Bo
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.734-739
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    • 2003
  • Many types of smart materials and control laws are available to actively adjust the structure from various external disturbances. Usually, a certain type of control laws to activate a specific smart material is well established, but the effectiveness of the control scheme is limited by the choice of the smart materials and the responses of the structure. ER fluid is adequate to provide relatively large control force, on the other hand, the PZT patches are suitable to provide small but arbitrary control forces at any point along the structure. It was found that active vibration control mechanism using ER fluid failed to suppress the excitation off the resonant frequency with changed structural characteristics along the frequency response function of the closed loop of the control system. To compensate this additional peak of the closed loop system, PPF control using PZT as an actuator is added to construct a hybrid controller.

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Performance Evaluation of Controlling Seismic Responses of a Building Structure with a Tuned Liquid Column Damper using the Real-Time Hybrid Testing Method (실시간 하이브리드 실험법을 이용한 동조액체기둥감쇠기가 설치된 구조물의 지진응답 제어성능 평가)

  • Chung, Hee-San;Lee, Sung-Kyung;Park, Eun-Churn;Min, Kyung-Won
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.669-673
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    • 2007
  • In this study, real-time hybrid test using a shaking table for the control performance evaluation of a U-shaped TLCD controlling the response of earthquake-excited building structure is experimentally implemented. In the test, the building structure is used as a numerical part, on which a U-shaped TLCD adopted as an experimental part was installed to reduceits response. At first, the force that is acting between a TLCD and building structure is measured from the load cell attached on shaking table and is fed-back to the computer to control the motion of shaking table. Then, the shaking table is so driven that the error between the interface acceleration computed from the numerical building structure with the excitations of earthquake and the fed-back interface force and that measured from the shaking table. The control efficiency of the TLCD used in this paper is experimentally confirmed by implementing this process of shaking table experiment on real-time.

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Accuracy assessment of real-time hybrid testing for seismic control of an offshore wind turbine supporting structure with a TMD

  • Ging-Long Lin;Lyan-Ywan Lu;Kai-Ting Lei;Shih-Wei Yeh;Kuang-Yen Liu
    • Smart Structures and Systems
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    • v.31 no.6
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    • pp.601-619
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    • 2023
  • In this study, the accuracy of a real-time hybrid test (RTHT) employed for a performance test of a tuned mass damper (TMD) on an offshore wind turbine (OWT) with a complicated jacket-type supporting structure is quantified and evaluated by comparing the RTHT results with the experimental data obtained from a shaking table test (STT), in which a 1/25-scale model for a typical 5-MW OWT controlled by a TMD was tested. In the RTHT, the jacket-type OWT structure was modelled using both multiple-DOF (MDOF) and single-DOF (SDOF) numerical models. When compared with the STT test data, the test results of the RTHT show that while the SDOF model, which requires less control computational time, is able to well predict the peak responses of the nacelle and TMD only, the MDOF model is able to effectively predict both the peak and over-all time-history responses at multiple critical locations of an OWT structure. This also indicates that, depending on the type of structural responses considered, an RTHT with either an SDOF or a MDOF model may be a promising alternative to the STT to assess the effectiveness of a TMD for seismic mitigation in an OWT context.

A study on the hybrid position/force control of two cooperating arms with asymmetric kinematic structures (비대칭 구조를 갖는 두 협조 로봇의 하이브리드 위치/힘 제어에 관한 연구)

  • 여희주;서일홍;홍석규;김창호
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.743-746
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    • 1996
  • A hybrid control scheme to regulate the force and position by dual arms is proposed, where two arms are treated as one arm in a kinematic viewpoint. Our approach is different from other hybrid control approaches which consider robot dynamics, in the sense that we employ a purely kinematic based approach for hybrid control, with regard to the nature of position-controlled industrial robots. The proposed scheme is applied to sawing task. In the sawing task, the trajectory of the saw grasped by dual arms is planned in an offline fashion. When the trajectory of the saw is planned to follow a line in a horizontal plane, 3 position parameters are to be controlled(i.e, two translational positions and one rotational position). And a certain level of contact force has to be controlled along the vertical direction(i.e., minus z-direction) not to loose the contact with the object to be sawn. Typical feature of sawing task is that the contact position where the force control is to be performed is continuously changing. Therefore, the kinematic mapping between the force controlled position and the joint actuators has to be updated continuously. The effectiveness of the proposed control scheme is experimentally demonstrated. The proposed hybrid control scheme can be applied to arbitrary dual arm systems, regardless of their kinematic structure and the number of actuated joints.

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Control Strategy for Buck DC/DC Converter Based on Two-dimensional Hybrid Cloud Model

  • Wang, Qing-Yu;Gong, Ren-Xi;Qin, Li-Wen;Feng, Zhao-He
    • Journal of Electrical Engineering and Technology
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    • v.11 no.6
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    • pp.1684-1692
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    • 2016
  • In order to adapt the fast dynamic performances of Buck DC/DC converter, and reduce the influence on converter performance owing to uncertain factors such as the disturbances of parameters and load, a control strategy based on two-dimensional hybrid cloud model is proposed. Firstly, two cloud models corresponding to the specific control inputs are determined by maximum determination approach, respectively, and then a control rule decided by the two cloud models is selected by a rule selector, finally, according to the reasoning structure of the rule, the control increment is calculated out by a two-dimensional hybrid cloud decision module. Both the simulation and experiment results show that the strategy can dramatically improve the dynamic performances of the converter, and enhance the adaptive ability to resist the random disturbances, and its control effect is superior to that of the current-mode control.

Multi-DOF Real-time Hybrid Dynamic Test of a Steel Frame Structure (강 뼈대 구조물의 다자유도 실시간 하이브리드 동적 실험)

  • Kim, Sehoon;Na, Okpin;Kim, Sungil
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.33 no.2
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    • pp.443-453
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    • 2013
  • The hybrid test is one of the most advanced test methods to predict the structural dynamic behavior with the interaction between a physical substructure and a numerical modeling in the hybrid control system. The purpose of this study is to perform the multi-directional dynamic test of a steel frame structure with the real-time hybrid system and to evaluate the validation of the results. In this study, FEAPH, nonlinear finite element analysis program for hybrid only, was developed and the hybrid control system was optimized. The inefficient computational time was improved with a fixed number iteration method and parallel computational techniques used in FEAPH. Furthermore, the previously used data communication method and the interface between a substructure and an analysis program were simplified in the control system. As the results, the total processing time in real-time hybrid test was shortened up to 10 times of actual measured seismic period. In order to verify the accuracy and validation of the hybrid system, the linear and nonlinear dynamic tests with a steel framed structure were carried out so that the trend of displacement responses was almost in accord with the numerical results. However, the maximum displacement responses had somewhat differences due to the analysis errors in material nonlinearities and the occurrence of permanent displacements. Therefore, if the proper material model and numerical algorithms are developed, the real-time hybrid system could be used to evaluate the structural dynamic behavior and would be an effective testing method as a substitute for a shaking table test.