Modeling and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msub><mml:mrow><mml:mi>H</mml:mi></mml:mrow><mml:mrow><mml:mi>∞</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> Control of Active-Passive Vibration Isolation for Floating Raft System

Yang, Bo; Hu, Yefa; Zhang, Jinguang

doi:10.1155/2017/5361702

Cited by 6 publications

(7 citation statements)

References 31 publications

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“…It performs well in suppressing specific frequencies and frequency fluctuation disturbances while being robust, rendering it suitable as a hybrid vibration absorber controller. 1,[19][20][21][22] In this study, an EHVA with double-ring series permanent magnetic circuit structure based on an improved Halbach array was designed to control the vibration of marine two-stage vibration isolation system. The EHVA can produce Lorentz force and eddy current damping, and has good engineering feasibility and output performance.…”

Section: Introductionmentioning

confidence: 99%

“…The two-stage vibration isolation system exhibits effective inhibition in high-frequency but cannot inhibit vibrations lower than its second-order natural frequency. 1 The exciting force generated by marine power machinery can be made equivalent to the fluctuating disturbance of small frequency range and random impact disturbance. This necessitates a vibration isolation system such that wide-band vibration attenuation performance can be achieved.…”

Section: Introductionmentioning

confidence: 99%

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Design, analysis, control simulation, and experiment of novel electromagnetic hybrid vibration absorber

Song

Fan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents a novel type of electromagnetic hybrid vibration absorber (EHVA) with a double-ring series permanent magnetic circuit applied to improve the two-stage vibration isolation system of marine power machinery. The EHVA comprises a mover with several groups of coils having a series connection, as well as a stator with internal permanent magnets and external permanent magnets, which form a novel magnetic circuit structure based on an improved Halbach array. In this magnet circuit, two adjacent groups of magnetic induction lines overlap at the coil position, thereby strengthening the magnetic field intensity. When the mover moves axially, the coil cuts the magnetic induction line to produce Lorentz force and magnetic damping force. First, the dynamic parameters of the EHVA were calculated based on multi-rigid-body dynamic theory and fixed-point theory. Second, the mechanical and electromagnetic structures of the EHVA were designed. Finally, a test stand was constructed, the system control channel was identified, and the simulation as well as experiment for vibration control using an [Formula: see text] controller were performed. Results indicated that the hybrid vibration reduction system under control reduced the acceleration amplitude by 12.3 dB at 30.6 Hz and achieved better vibration absorption effects between 27 and 33 Hz compared with the uncontrolled system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design, analysis, control simulation, and experiment of novel electromagnetic hybrid vibration absorber

Song

Fan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…20 In another study, an adaptive control approach was developed for a flexible-jointed robot faced with random disturbances 21 Moreover, a stochastic model and an H∞-robust method were presented to handle the noise in the input–output measurements of a floating raft. 22 However, these methods only consider the random vibration in the input channels (external disturbances). Another study 23 was conducted to investigate a symbolic and numeric scheme to solve linear differential equations with random parameter uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Dynamic output feedback control for a walking assistance training robot to handle shifts in the center of gravity and time-varying arm of force in omniwheel

Chang

Wang

Sun

2020

International Journal of Advanced Robotic Systems

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In this study, we designed a dynamic output feedback control for a walking assistance training robot. The proposed system addresses the problems of shifts in the center of gravity and vibration associated with time-varying arm of force in omniwheel to improve the accuracy of the trajectory tracking of the walking assistance training robot. The dynamic output feedback controller was developed by constructing a velocity observer on a stochastic dynamic model of the walking assistance training robot via integration with a Lyapunov function. An analysis of the time-varying arm of force in omniwheel revealed that it increased the accuracy of the walking assistance training robot dynamic model. Thus, an adaptive law was designed such that the vibration caused by the time-varying arm of force in omniwheel was eliminated. The mean absolute practical stability in the position and velocity tracking errors was verified based on Young’s inequality and stochastic stability theory. The simulation results show that the walking assistance training robot with the shifts in the center of gravity was able to track a designed trajectory and that the application of the adaptive law effectively eliminates the vibrations caused by the time-varying arm of force in omniwheel.

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“…Vibration isolation has been of great interest in the academic and industrial areas of lithography machines [1], high-precision measuring instruments [2], [3], automobiles [4], [5], aerospace [6], [7], civil structures [8], and floating raft [9], [10]. Passive vibration isolation systems, such as springs, are often sufficient for high-frequency isolation in many applications [11].…”

Section: Introductionmentioning

confidence: 99%

Design and Control of a Dual-Stage Actuation Active Vibration Isolation System

Zhao¹,

Shi²,

Tan³

2019

IEEE Access

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Active vibration isolation system is used in various fields to reduce the vibrations transmitted. In this paper, a novel dual-stage actuator is proposed, which combines a voice coil motor and a piezoelectric actuator. The proposed dual-stage actuator maintains the advantages, in terms of the long stroke, the high precision, and the wide band. The dual-stage actuation active vibration isolation system (DSA-AVIS) with the proposed dual-stage actuator is initially modeled. The characteristic of the DSA-AVIS is subsequently analyzed. H ∞ controller is finally designed to consider the vibration isolation performance and the output range of the actuators. The experimental results indicate that the closed-loop transmissibility of the DSA-AVIS is less than -18 dB from 0 to 100 Hertz.

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Modeling and H∞ Control of Active-Passive Vibration Isolation for Floating Raft System

Cited by 6 publications

References 31 publications

Design, analysis, control simulation, and experiment of novel electromagnetic hybrid vibration absorber

Design, analysis, control simulation, and experiment of novel electromagnetic hybrid vibration absorber

Dynamic output feedback control for a walking assistance training robot to handle shifts in the center of gravity and time-varying arm of force in omniwheel

Design and Control of a Dual-Stage Actuation Active Vibration Isolation System

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