• Title/Summary/Keyword: 능동 진동 제어

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Electromagnetic Actuator for Active Vibration Control of Precise System (초정밀 시스템의 능동 진동제어용 전자기 액츄에이터)

  • Lee, Joo-Hoon;Jeon, Jeong-Woo;Hwang, Don-Ha;Kang, Dong-Sik;Choi, Young-Kiu
    • Proceedings of the KIEE Conference
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    • 2005.10b
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    • pp.228-230
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    • 2005
  • In this paper, we address an active vibration control system, which suppresses the vibration engaged by magnetically levitated stage. The stage system consists of a levitating platen with four permanent magnetic linear synchronous motors in parallel. Each motor generates vertical force for suspension against gravity and propulsion force horizontally as well. This stage can generate six degrees of freedom motion via the vertical and horizontal forces. In the stage system, which represents the settling-time critical system, the motion of the platen vibrates mechanically. We designed an active vibration control system for suppressing vibration due to the stage moving. The command feedforward with inertial feedback algorithm is used for solving stage system's critical problems. The components of the active vibration control system are accelerometers for detecting stage tables's vibrations, a digital controller with high precise signal converters. and electromagnetic actuators.

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Active Vibration Control of Plate using PZT (압전세라믹 액츄에이터를 이용한 평판의 능동 진동 제어)

  • Kim, Joon-Kook;Choi, Soo-Young;Cho, Yong-Suk;Park, Ki-Heon
    • Proceedings of the KIEE Conference
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    • 2004.07d
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    • pp.2389-2391
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    • 2004
  • This paper is concerned with the active vibration control of plate system using electromagnetic force actuator. The transfer function from the force input to the bending displacement was obtained via modal analysis results. Control algorithm are proposed and implemented on the experimental setups to show their efficacy. In this paper, the genetic algorithm is used to design a $H_2$ controller. Effectiveness and performance of the designed controller were verified by simulation and experiment results.

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Vibration Control Performance Evaluation of Semi-active Outrigger Damper System (준능동 아웃리거 댐퍼시스템의 진동제어 성능평가)

  • Kim, Hyun-Su;Kang, Joo-Won
    • Journal of Korean Association for Spatial Structures
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    • v.15 no.4
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    • pp.81-89
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    • 2015
  • Damped outrigger systems have been proposed as a novel energy dissipation system to protect tall buildings from severe earthquakes and strong wind loads. In this study, semi-active damping devices such as magnetorheological (MR) dampers instead of passive dampers are installed vertically between the outrigger and perimeter columns to achieve large and adaptable energy dissipation. Control performance of semi-active outrigger damper system mainly depends on the control algorithm. Fuzzy logic control algorithm was used to generate command voltage sent to MR damper. Genetic algorithm was used to optimize the fuzzy logic controller. An artificial earthquake load was generated for numerical simulation. A simplified numerical model of damped outrigger system was developed. Based on numerical analyses, it has been shown that the semi-active damped outrigger system can effectively reduce both displacement and acceleration responses of the tall building in comparison with a passive outrigger damper system.

Active Vibration Control of a Plate Using the Distributed Modal Sensitivity (분포모달감도를 이용한 평판의 능동진동제어)

  • 송철기;박재상;이장무;황진권;최종호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.320-325
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    • 1995
  • This study deals with the active vibration control system for an all-clamped rectangular plate with piezoceramic actuators and sensors. A line nonent algorithm (LMA) with the distributed modal sensitivity(DMS) is proposed to reduce the structural vibrations effectively and to select the optimal locations and the optimal directions (skewed angles) of uniform piezoelectric actuators or sensors. Experimental results show that eachmode can attenuated byabout 10 .approx. 13 dB in case a piezoelectric actuator generate the psuedo-random disturbances that excite the plate modes.

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System Identification for Active Vibration control (능동 진동제어를 위한 시스템 동정)

  • 송철기;황진권;최종호;이장무
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.397-401
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    • 1994
  • This paper proposes an identification method for a thin plate where multiple actuators and sensors are bonded. Since a thin plate has small damping ratios of all modes, each mode can be identified seperately with a bandpass filter for each modal signal. With the bandpass filter and the characteristics of the plate, the Multi-Input Multi-Output (MIMO) model of the plate can be converted to several Multi-Input Single-Output(MISO) models of second order linear difference equations of the modes. Parameters for each mode are obtained by using the Least Square method. Form there MISO models, the MIMO model is obtained in the form of the state space. Experiments were performed for an all-clamped plate with two pairs of piezoelectric actuators and sensors. The outputs of the identified model and the experimental data match well.

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Active Vibration Control of a Cantilever Beam Using Piezoelectric Sensor/Actuator (압전형 감지기/작동기를 이용한 외팔보의 능동 진동 제어)

  • Choi, Soo-Young;Kim, Jin-Tae;Jung, Tae-Soo;Kang, Ki-Won;Park, Ki-Heon
    • Proceedings of the KIEE Conference
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    • 2002.07d
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    • pp.2123-2125
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    • 2002
  • This paper presents the use of piezoelectric ceramics for sensing and actuation purposes for vibration control. The PZT sensors and actuators are designed and fabricated. The transfer function of the beam is obtained via the Lagrangian method.

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A Development of Active Controller for the Vibration of Tall Civil St (고층 빌딩의 진동에 대한 능동제어기의 개발)

  • Lee, Y.J.;Chang, Y.H.;Song, B.M.;Lee, K.S.
    • Proceedings of the KIEE Conference
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    • 1997.07b
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    • pp.689-692
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    • 1997
  • This paper is attempt to develop an active controller for the vibration of tall civil structures due to earthquake-induced ground acceleration. Various active control methods are applied to an 8 story base isolated system(BIS) with a fumed mass damper(TMD) at the base of the building. The results are also investigated.

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Application of Semi-active TMD for Vibration Control of Floor Slab (바닥판 구조물의 진동제어를 위한 준능동 TMD의 적용)

  • Kim, Gee-Cheol;Kang, Joo-Won
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2007.04a
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    • pp.607-612
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    • 2007
  • A conventional passive TMD is only effective when it is tuned properly. In many practical applications, inevitable off-tuning of a TMD occurs because the mass in a building floor could change by moving furnishings, people gathering, etc. When TMDs are off tuned, TMDs their effectiveness is sharply reduced. This paper discusses the application of MR-TMD, semi-active damper, for the reduction of floor vibrations due to machine and human movements. Here, the groundhook and skyhook algorithm are applied to a single degree of freedom system representative of building floors. And displacement and velocity base control method are applied to reduce t100r vibration. The performance of the STMD is compared to that of the equivalent passive TMD. Comparison of the results demonstrates the efficiency and robustness of STMD with respect to equivalent TMD.

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An Experimental Study for Active Vibration Control of Flexible Cantilever Beam (유연 외팔보의 능동 진동 제어를 위한 실험적 연구)

  • Choi, Soo-Young;Jung, Joon-Hong;Kang, Ki-Won;Park, Ki-Heon
    • Proceedings of the KIEE Conference
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    • 2003.07d
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    • pp.2251-2253
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    • 2003
  • This paper is concerned with the active vibration control of flexible cantilever beam system using electromagnetic force actuator. The main objective of this paper is to propose the control algorithms and implement the experimental setups for active vibration control. Several control algorithms are proposed and implemented on the experimental setups to show their efficacy. These include a PID control design, an optimal $H_2$ control design, and a fuzzy PID control design. Effectiveness and performance of the designed controller were verified by both simulation and experiment results.

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Active Control of Optimization Process in Lens Design by Using Lagrange's Undetermined Multipliers (광학설계의 최적화과정에서 Lagrange 부정승수를 이용한 능동적 제어)

  • 조용주;이종웅
    • Proceedings of the Optical Society of Korea Conference
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    • 2000.08a
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    • pp.40-41
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    • 2000
  • 광학설계의 최적화에서는 최소자승법과 감쇠최소자승법이 주로 사용되고 있다. 최소자승법은 error의 제곱의 합을 최소화하는 방법으로, 이 방법은 최적점 부근에서의 불안정성이 발생하는 문제점이 있다. 감쇠최소자자승법은 최소자승법에 적절한 감쇠항을 부가함으로써 최적점 부근에서의 불안정성을 줄여주고 있다. 본 연구에서는 광학설계의 제한조건을 Lagrange 부정승수$^{(1)}$ 를 사용하여 감쇠최소자승법의 정규방정식에 결합하여 제한조건을 유지하면서 merit function을 줄이는 방법에 대하여 연구하였다. 이 방법에서는 제한조건이 merit function의 error 함수보다 우선적으로 보정되며, 이를 이용하여 매 iteration 마다 merit function에서 절대값이 큰 error를 감쇠최소자승법의 정규방정식에서 제거하고 이 보정조건을 제한조건에 추가함으로서 다른 error항 보다 우선적으로 보정되도록 하였다. 이 때 이 error를 한번에 보정하는 경우에는 merit function의 진동이 심하고 광학계가 사용불가능한 형태로 변화하는 경우가 많아 적절한 target ratio를 설정하여 반복과정을 통하여 점진적으로 보정되도록 하였으며, 이를 통하여 최적화의 안정성을 개선할 수 있었다. (중략)

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