Identification of rod dynamics under influence of Active Magnetic Bearing

Tsai, Nan-Chyuan; Li, Heng Yi; Lin, Chih Che; Chiang, Chi-Wu; Wang, Pai Lu

doi:10.1016/j.mechatronics.2011.03.010

Cited by 18 publications

(5 citation statements)

References 23 publications

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“…Accordingly, the state-space model of the rotor-AMB can be obtained by appending the linearized AMB force model to the aforementioned rotor dynamic model. Tsai et al provided a similar method (Tsai et al 2014) to identify the dynamics of rotor-AMB systems. The rotor-AMB control system is shown in Figure 1.…”

Section: Rotor-amb System Modelmentioning

confidence: 99%

RETRACTED: Dual-mode predictive flexible rotor control for active magnetic bearings with input constraints

Zhao

Zhang

et al. 2016

Journal of Vibration and Control

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Active magnetic bearings (AMBs) are often used to mitigate vibrations in turbines, compressors, machining spindles, etc. However, rotor-AMBs are inherent open-loop unstable systems, and hence it is an urgent yet challenging task to stabilize rotor-AMBs with external disturbances. A dual-mode predictive flexible rotor controller is developed hereby for a rotor-AMB system with input constraints. The method is afterwards proved to be capable of enlarging the region of attraction, and hence can effectively mitigate more-intensive vibrations excited by external disturbances, which is desirable in real applications. Finally, experiments are conducted on the rotor-AMB system to show the effectiveness of the proposed dual-mode predictive controller.

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Section: Rotor-amb System Modelmentioning

confidence: 99%

RETRACTED: Dual-mode predictive flexible rotor control for active magnetic bearings with input constraints

Zhao

Zhang

et al. 2016

Journal of Vibration and Control

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“…Hence AMB is proposed as a suitable choice for magnetica pled thruster, to mitigate some of the problems associated with the conventional AMBs offer advantages like low friction, offers high rotational speed, there is no ment for lubricants, absence of temperature rise due to non-contact, and auto-adj of the center of mass [12][13][14]. The AMB is utilized in many industrial applicati turbine compressor of the nuclear reactor, where reliability and safety are very im [15], precise machine tools like high-speed spindles of large and miniature mill chines [16,17], wind power generators [18] and medical devices like artificial hear [12] to name a few. An AMB system is a combination of different electrical, mec and electro-magnetic components namely, sensors, amplifier, controller, data acq card, rotor, and electromagnets (EM).…”

Section: Introductionmentioning

confidence: 99%

Investigation of a 2-DOF Active Magnetic Bearing Actuator for Unmanned Underwater Vehicle Thruster Application

Ahad

Ahmad

2021

Actuators

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In this work, a novel application of Active Magnetic Bearing (AMB) is proposed to integrate AMB in the Magnetically Coupled Thruster (MCT) assembly for underwater application. In this study, a 2-Degree-Of-Freedom (DOF) AMB is developed and investigated for the MCT of an Unmanned Underwater Vehicle (UUV). The paper presents the detailed electro-mechanical modeling of the in-house developed AMB system. The intractable problem of rotor suspension and rotation with opposing pairs of electromagnets is considered. A Linear Quadratic Gaussian (LQG) controller is designed and analyzed in the frequency domain for the stabilization of the open-loop unstable AMB for MCT. The performance specifications of the controller, such as reference tracking and disturbance rejection are achieved and evaluated through real-time implementation of the controller. The compensator also performed reasonably well during the dynamic operations, i.e., when the rotor-propeller assembly was spun at 1500 rpm. This rotor speed is needed to generate a thrust of 40–45 N and up to 1 m/s forward velocity, which is necessary to propel the UUV under consideration. By deploying AMB in MCT assembly, it is anticipated that problems associated with the conventional directly coupled thruster operating in harsh underwater environment, such as water ingress into electronics compartment, rusting, lubrication, and vibrations would be eliminated.

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“…Here, a ridge refers to a curve formed by the most energy-intensive points in a TFI [3][4][5]. For this reason, reflecting a change of frequencies with time, a ridge can discover instantaneous properties of a mechanical part [1,[3][4][5][6]. Consequently, ridge extraction from a TFI of a signal can serve to recover an IF of a mechanical part [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Ridge extraction based on adaptive variable-bandwidth cost functions by edge detection of time frequency images

Dou

Lin

2020

Meas. Sci. Technol.

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Ridge extraction of a time frequency image (TFI) can serve to estimate an instantaneous frequency of a signal. However, there is a considerable difficulty in ridge extraction of a multi-ridge TFI due to mutual interference between ridges. Some traditional methods for ridge extraction fail to resolve this difficulty. The one-step cost function (OSCF), a typical method for processing a multi-ridge TFI, lacks self-adaptation in determining searching regions of a targeted ridge. To overcome this question, this paper proposes an adaptive variable-bandwidth cost function (AVBCF) for ridge extraction. Firstly, a TFI is acquired by time frequency analysis of a signal. Afterwards, the TFI is filtered into a binary image by a Canny detector. Also, some dispersive ridges in the binary image serve to form a synthetic dispersive ridge. Next, searching regions of a targeted ridge are estimated by projecting statistics of edges of the synthetic dispersive ridge to the targeted ridge. Next, the AVBCF is compared with the OSCF and some widespread methods numerally and experimentally. The results demonstrate that the AVBCF performs better than the other methods.

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Identification of rod dynamics under influence of Active Magnetic Bearing

Cited by 18 publications

References 23 publications

RETRACTED: Dual-mode predictive flexible rotor control for active magnetic bearings with input constraints

RETRACTED: Dual-mode predictive flexible rotor control for active magnetic bearings with input constraints

Investigation of a 2-DOF Active Magnetic Bearing Actuator for Unmanned Underwater Vehicle Thruster Application

Ridge extraction based on adaptive variable-bandwidth cost functions by edge detection of time frequency images

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