• Title, Summary, Keyword: Vibration Control

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Active Control of Structural Vibration Using An Instantaneous Control Algorithm including Acceleration Feedback (가속도가 포함된 순간최적제어 알고리듬을 이용한 구조물 진동의 능동제어)

  • 문석준;정태영
    • Journal of KSNVE
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    • v.6 no.2
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    • pp.215-224
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    • 1996
  • Active vibration control is generally used to reduce vibration level by the actuators based on measured signal. Dynamic properties of a structure can be easily modified by the active vibration control, so that the vibration level may be effectively reduced to the magnitude below the allowable limit over a wide frequency rangs. In this paper, an instantaneous optimal control algorithm including acceleration feedback is presented for the active vibration control of large structures considering facts that the acceleration response can be easily measured, but the displacement and velocity response are obtained by numerically integrating the measured acceleration response with some errors. The adverse effect of the time delay is overcomed by taking into account the dynamic characteristics of an actuator and filters in the design of controller. Performance test is carried out using a hydraulic active mass driver on a test structure$(L{\times}W{\times}H;=;1200mm{\times}800mm{\times}1600mm, about;500kg)$ supported by four columns under base excitations. It is confirmed that the vibration level of the test structure are reduced to about 1/6 near resonance.

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Evaluation of Vibration Control Performance for Active Hybrid Mount System : Experimental Investigation (능동 하이브리드 마운트 시스템의 진동제어 성능 평가 : 실험적 고찰)

  • Oh, Jong-Seok;Choi, Seung-Bok;Quoc, Nguyen Vien;Moon, Seok-Jun;Choi, Sang-Min
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.85-90
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    • 2011
  • In this work, an active hybrid mount using piezostack actuator and rubber element is manufactured, and its vibration control performance is evaluated via feedforward control. A hybrid active mount featuring inertia type of piezostack actuator is proposed and manufactured. After describing the configuration of the hybrid mount, a mount system is then constructed. To attenuate vibrations from vibration sources, a feedforward controller is experimentally implemented to the system. Vibration control performances are evaluated at each mount. Effective Control performances such as accelerations are obtained and presented in frequency domains.

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Active Vibration Control of Washing Machine by Acceleration Feedback Controller (가속도 피이드백 제어기를 이용한 세탁기의 능동진동제어)

  • Kim, Seung-Ki;Kwak, Moon K.;Yang, Dong-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.28-31
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    • 2014
  • This paper is concerned with the active vibration control of washing machine. To this end, a new control algorithm utilizing an acceleration signal as a sensor signal is newly developed based on the principle of a dynamic absorber. The resulting control algorithm was implemented digitally on the DSP board. The accelerometer and the active linear actuator were used as sensor and actuator for the active vibration control of washing machine. Experimental results show that the proposed control algorithm can be effectively used for a controller which uses an accelerometer.

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Evaluation of Vibration Control Performance for Active Hybrid Mount System : Experimental Investigation (능동 하이브리드 마운트 시스템의 진동제어 성능 평가 : 실험적 고찰)

  • Oh, Jong-Seok;Choi, Seung-Bok;Nguyen, Vien Quoc;Moon, Seok-Jun;Choi, Sang-Min
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.21 no.5
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    • pp.455-460
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    • 2011
  • In this work, an active hybrid mount using piezostack actuator and rubber element is manufactured, and its vibration control performance is evaluated via feedforward control. A hybrid active mount featuring inertia type of piezostack actuator is proposed and manufactured. After describing the configuration of the hybrid mount, a mount system is then constructed. To attenuate vibrations from vibration sources, a feedfoward controller is experimentally implemented to the system. Vibration control performances are evaluated at each mount. Effective control performances such as accelerations are obtained and presented in frequency domains.

An analysis of the status and problems for the noise & vibration control laws by questionnaires (설문조사를 통한 소음.진동규제법의 현황 및 문제점 분석)

  • Son, Jeong-Gon;Kim, Jeong-Tae;Lee, Ji-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.889-898
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    • 2008
  • In this study, analyze the status and problem of a noise and vibration control laws of it through the questionnaire. The method of survey was made by questionnaires which were the civil worker 138 persons and civil servant 132 persons. Based on this survey, we suggest a improvement of the noise and vibration control laws.

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Vibration Suppression Control for an Articulated Robot;Effects of Model-Based Control Integrated into the Position Control Loop

  • Itoh, Masahiko
    • 제어로봇시스템학회:학술대회논문집
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    • pp.2016-2021
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    • 2003
  • This paper deals with a control technique of eliminating the transient vibration with respect to a waist axis of an articulated robot. This control technique is based on a model-based control in order to establish the damping effect on the driven mechanical part. The control model is composed of reduced-order electrical and mechanical parts related to the velocity control loop. The parameters of the control model can be obtained from design data or experimental data. This model estimates a load speed converted to the motor shaft. The difference between the estimated load speed and the motor speed is calculated dynamically, and it is added to the velocity command to suppress the transient vibration. This control method is applied to an articulated robot regarded as a time-invariant system. The effectiveness of the model-based control integrated into the position control loop is verified by simulations. Simulations show satisfactory control results to reduce the transient vibration at the end-effector.

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A Design Of Active Vibration Control System For Precise Maglev Stage (초정밀 자기부상 스테이지용 능동진동제어시스템 설계)

  • Lee, Joo-Hoon;Kim, Yong-Joo;Son, Sung-Wan;Lee, Hong-Ki;Lee, Se-Han;Choi, Young-Kiu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.121-124
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    • 2004
  • 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 fer 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 fer solving stage system's critical problems. The components of the active vibration control system are accelerometers for detecting stage table's vibrations, a digital controller with high precise signal converters, and electromagnetic actuators.

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Active control of the Self-excited Vibration of a Rotor System Supported by Tilting-Pad Gas Bearing (틸딩 패드 기체 베어링으로 지지된 로터 계 자려 진동의 능동제어)

  • Kwon, Tae-Gyu
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.2
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    • pp.119-125
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    • 2001
  • This paper presents an experimental study on active control of self-excited vibration for a high speed turbomachinery. In order to suppress the self-excited vibration, it is necessary to actively control the air film pressure or the air film thickness. In this study, active pads are used to control the air film thickness. Active pads are supported by pivots containing piezoelectric actuators and their radial position can be actively controlled by applying voltage to the actuators. The transfer characteristics from actuator inputs to shaft vibration outputs are experimentally investigated. In a tilting-pad gas bearing (TPGB), a shaft is supported by the pressurized air film. Four gap sensors were used to measure the vibration of the shaft and PID was used in the feedback control of the shaft vibration. The experimental results show that the self-excited vibration of the rotor can be effectively suppressed if the PID controller gains are properly chosen. As a result we find that the feedback control is effective for suppressing the self-excited vibration of a rotor system using stack-type PZT actuators.

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Simultaneous precision positioning and vibration suppression of reciprocating flexible manipulators

  • Ma, Kougen;Ghasemi-Nejhad, Mehrdad N.
    • Smart Structures and Systems
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    • v.1 no.1
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    • pp.13-27
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    • 2005
  • Simultaneous precision positioning and vibration suppression of a reciprocating flexible manipulator is investigated in this paper. The flexible manipulator is driven by a multifunctional active strut with fuzzy logic controllers. The multifunctional active strut is a combination of a motor assembly and a piezoelectric stack actuator to simultaneously provide precision positioning and wide frequency bandwidth vibration suppression capabilities. First, the multifunctional active strut and the flexible manipulator are introduced, and their dynamic models are derived. A control strategy is then proposed, which includes a position controller and a vibration controller to achieve simultaneous precision positioning and vibration suppression of the flexible manipulator. Next, fuzzy logic control approach is presented to design a fuzzy logic position controller and a fuzzy logic vibration controller. Finally, experiments are conducted for the fuzzy logic controllers and the experimental results are compared with those from a PID control scheme consisting of a PID position controller and a PID vibration control. The comparison indicates that the fuzzy logic controller can easily handle the non-linearity in the strut and provide higher position accuracy and better vibration reduction with less control power consumption.

Vibration Control of a Rotating Cantilevered Beam Using Piezoceramic Actuators (압전 세라믹 작동기를 이용한 회전 외팔 보의 진동 제어)

  • 박종석;최승복;정재천
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.255-259
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    • 1996
  • This paper presents active vibration control of a rotating cantilevered beam using piezoceramic actuators. A governing equation of motion is obtained by the Hamilton's principle and expressed in the state space representation. Subsequently, an H$_{\infty}$ control which is robust to system uncertainties is synthesized through the loop shaping design procedure. Computer simulations for the steady-state vibration control are undertaken in order to demonstrate the effectiveness and robustness of the proposed control methodology..y.

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