• Title/Summary/Keyword: Auxiliary Mass

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A Study on Swing Motion Control System Design for the Spreader of the Crane (크레인 스프레더의 Swing Motion 제어에 관한 연구)

  • Chae, G.H.;Kim, Y.B.
    • Journal of Power System Engineering
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    • v.7 no.3
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    • pp.54-60
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    • 2003
  • In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In this paper, we suggest a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container to reduce the swing motion in the desired manner. In this paper, we apply the $H_{\infty}$ based control technique to the anti-sway control system design problem. And the experimental result shows that the proposed control system is shown to be useful and robust to disturbances like winds and initial sway motion.

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A Study on Swing Motion Control System Design for the Spreader of the Crane with Varying Rope Length (크레인 스프레더의 Swing Motion 제어에 관한 연구 : 로프 길이변화를 고려한 경우)

  • An, S.B.;Chae, G.H.;Kim, Y.B.
    • Journal of Power System Engineering
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    • v.8 no.1
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    • pp.55-61
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    • 2004
  • In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In this paper, we suggest a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container in order to reduce the swing motion in the desired manner. In this paper, we apply the $H_{\infty}$ based control technique to the anti-sway control system design problem. And the experimental result shows that the proposed control system is useful and robust to disturbances like winds and initial sway motion.

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A New Approach to Anti-Sway System Design Problem

  • Kim, Young-Bok
    • Journal of Mechanical Science and Technology
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    • v.18 no.8
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    • pp.1306-1311
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    • 2004
  • We suggest a new type of swing motion control system for a crane system in which a small auxiliary mass is installed on the spreader. The actuator reacting against the auxiliary mass applies inertial control forces to the spreader of the container crane to reduce the swing motion in the desired manner. In this paper, as the basic and first step, we apply the $H_{\infty}$ control approach to anti-sway control system design problem. And, it will be shown that the proposed control strategy is useful and it can be easily applicable to the real world. So, in this study, we investigate usefulness of the proposed anti-sway system and evaluate system performance through simulation and experimental studies.

A Study on the Design of the Anti-Rolling Control System for a Ship (선박의 횡동용 방지 장치 개발에 관한 연구)

  • Kim, Young-Bok;Byun, Jung-Hoan
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.5
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    • pp.438-444
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    • 2001
  • In this paper, an actively controlled anti-rolling system is considered to reduced the rolling motion of the ship. In this control system, a small auxiliary mass is installed on the upper area of the ship, and the actuator is connected between the auxiliary mass and the ship. The actuator reacts against the auxiliary mass, applying inertial control corves to the ship to reduce the rolling motion in the desired manner. in this paper, we apply the PID controller to design the anit-rolling control system for the controlled hip. And the experimental result shows that the desirable control performance is achieved.

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An Experimental Study on the Rolling Motion Control of a Ship Based on LMI Approach (LMI를 이용한 선박 횡동요 제어에 관한 실험적 연구)

  • 채규훈;김영복
    • Journal of Ocean Engineering and Technology
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    • v.17 no.2
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    • pp.60-66
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    • 2003
  • In this paper, an actively controlled anti-rolling system is considered, in order to reduce the rolling motion of a ship. In this control system, a small auxiliary mass is installed on the upper area of the ship, and an actuator is connected between the auxiliary mass and the ship. The actuator reacts the auxiliary mass, applying inertial control forces to the ship to reduce the rolling motion in the desired manner. In this paper, we introduce LMI based H$_{\infty}$ control approach to design the anti-rolling control system for the controlled ship. And the experimental results show that the desirable control performance can be achieved.

An Experimental Study on the Development of the Anti-Rolling Control System for a Ship (선체 횡동요 방지 장치 개발을 위한 실험적 연구)

  • 김영복;변정환;양주호
    • Journal of Ocean Engineering and Technology
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    • v.14 no.4
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    • pp.43-48
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    • 2000
  • In this paper, an actively controlled anti-rolling system is considered to reduce the rolling motion of the ship. In this control system, a small auxiliary mass is installed on the upper area of the ship, and actuator us connected between the auxiliary mass and a ship. The actuator reacts against the auxiliary mass, applying inertial control forces to the ship to reduce the rolling motion in the desired manner. In this paper, we apply the PID controller to design the anti-rolling control system for the controlled ship. And the experimental result shows that the desirable control performance is achieved.

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Mitigation of motions of tall buildings with specific examples of recent applications

  • Kareem, Ahsan;Kijewski, Tracy;Tamura, Yukio
    • Wind and Structures
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    • v.2 no.3
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    • pp.201-251
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    • 1999
  • Flexible structures may experience excessive levels of vibration under the action of wind, adversely affecting serviceability and occupant comfort. To ensure the functional performance of a structure, various design modifications are possible, ranging from alternative structural systems to the utilization of passive and active control devices. This paper presents an overview of state-of-the-art measures that reduce the structural response of buildings, including a summary of recent work in aerodynamic tailoring and a discussion of auxiliary damping devices for mitigating the wind-induced motion of structures. In addition, some discussion of the application of such devices to improve structural resistance to seismic events is also presented, concluding with detailed examples of the application of auxiliary damping devices in Australia, Canada, China, Japan, and the United States.

Swing Motion Control System Design Based on Frequency-shaped LQ Control (주파수 의존형 최적 레귤이터에 의한 크레인 흔들림 제어계 설계)

  • Kim, Y.B.;Jang, J.S.
    • Journal of Power System Engineering
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    • v.12 no.6
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    • pp.50-55
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    • 2008
  • In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In many papers reported by us, we suggested a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container in order to reduce the swing motion in the desired manner. Futhermore the measuring systems based on image sensor have been proposed also. To obtain the robustness for our control system, $H_{\infty}$ based control techniques and other approach have been applied to suppress swing motion. As well known, the robust control technologies based on $H_{\infty}$ control need complicated and difficult process. In the result, the obtained closed-loop system becomes to high order system which may give us many difficulties to apply it to the real plants. Therefore, we introduce an easy approach which is based on LQ control theory. In this approach, we introduce the frequency dependent weighting matrices which give the system filters to shape frequency characteristics of the controlled system and guarantee the control performance.

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Measurement and Control of Swing Motion Using Image Sensor (이미지 센서를 이용한 크레인의 흔들림 계측 및 제어)

  • Kim, Y.B.;Kawai, H.;Choi, Y.W.;Lee, K.S.;Chae, G.H.
    • Journal of Power System Engineering
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    • v.11 no.4
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    • pp.103-108
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    • 2007
  • In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In many papers reported by us, we suggested a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container in order to reduce the swing motion in the desired manner. The measuring system is based on laser sensor or others. However it is not so useful in real world. Especially, in this paper, the image sensor is used to measures the motions of the spreader and the measured data are fed back to the controller in real time. The applied image processing technique is a kind of robust template matching method which is named Vector Code Correlation (VCC) and devised to consider the real environmental conditions. And the $H_{\infty}$ based control technique is applied to suppress swing motion of the crane. And the experimental result shows that the proposed measurement system based on image sensor and control system is useful and robust to disturbances.

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A semi-active smart tuned mass damper for drive shaft

  • Cai, Q.C.;Park, J.H.;Lee, C.H.;Park, J.L.;Yoon, D.Y.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.10a
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    • pp.349-354
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    • 2011
  • Tuned mass damper is widely used in many applications of industry. The main advantage of tuned mass damper is that it can increase the damping ratio of system and reduce the vibration amplitude. Meanwhile, the natural frequency of system will be divided by two peaks, and the peak speeds are closely related to the mass and the stiffness of auxiliary mass system added. In addition, the damping ratio will also affect the peak frequency of the dynamic response. In the present research, the nonlinear mechanical characteristics of rubber is investigated and put into use, since it is usually manufactured as the spring element of tuned mass damper. By the sense of the nonlinear stiffness as well as the damping ratio which can be changed by preload applied on, the shape memory alloy is proposed to control the auxiliary mass system by self-optimizing. Supported by the experiment data of rubber, the 1 DOF theoretical model and finite element model based on computer simulation are implemented to perform the feasibility of the proposed semi-active tuned mass damper working on the drive shaft.

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