Dynamic characteristics of active-control devices

V. M. Mashinistov; M. P. Sobolev; V. I. Surkov; I. A. Khasin; M. I. �tingof

doi:10.1007/bf00824437

Dynamic characteristics of triaxial active control magnetic bearing with asymmetric structure

Open Physics ◽

10.1515/phys-2018-0002 ◽

2018 ◽

Vol 16 (1) ◽

pp. 9-13 ◽

Cited By ~ 1

Author(s):

Atsushi Nakajima ◽

Katsuhiro Hirata ◽

Noboru Niguchi ◽

Masayuki Kato

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Active Control ◽

Dynamic Characteristics ◽

Negative Pressure ◽

Axial Direction ◽

Magnetic Bearing ◽

Magnetic Bearings ◽

Asymmetric Structure ◽

Element Analysis

Abstract Supporting forces of magnetic bearings are lower than those of mechanical bearings. In order to solve these problems, this paper proposes a new three-axis active control magnetic bearing (3-axis AMB) with an asymmetric structure where its rotor is attracted only in one axial direction due to a negative pressure of fluid. Our proposed 3-axis AMB can generate a large suspension force in one axial direction due to the asymmetric structure. The performances of our proposed 3-axis AMB are computed through 3-D finite element analysis.

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Investigating the dynamic characteristics of the hydrostatic bearing spindle system with active piezoelectric restrictors

Journal of Tribology ◽

10.1115/1.4053179 ◽

2021 ◽

pp. 1-20

Author(s):

Yixin Zhang ◽

Wei Pan ◽

Shuo Zhan ◽

Ran Huang ◽

Shujiang Chen ◽

...

Keyword(s):

Active Control ◽

Dynamic Characteristics ◽

Control Method ◽

Spindle System ◽

Optimization And Control ◽

And Control ◽

Pipeline Model ◽

Structural Optimization And Control ◽

Industrial Demand ◽

Active Control Method

Abstract Studies show that active control technology can improve system performance and meet the increasing industrial demand in diverse applications. In the present study, the dynamic characteristics of the bearing-spindle system based on active piezoelectric (PZT) restrictors, including the amplitude-frequency and phase-frequency characteristics are analyzed theoretically and experimentally. In the analysis, the influence of the pipeline model on the system characteristics is studied. Then the feasibility and effectiveness of the active control method are verified through experiments. It is demonstrated that the theoretical and experimental results are consistent. The present study is expected to provide a guideline for further investigations on the structural optimization and control law design for active hydrostatic oil-film bearing spindle systems.

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On a Portable Secure Information Protection Arrangement Using Active Control Devices

2009 Second International Conference on Future Information Technology and Management Engineering ◽

10.1109/fitme.2009.65 ◽

2009 ◽

Author(s):

Qian Wu ◽

Li Fan

Keyword(s):

Active Control ◽

Information Protection ◽

Secure Information ◽

Control Devices

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Semi-Active Control of Structural Systems Aiming to Approximate the Performance of the Targeted Active Control Law: Output Emulation Approach

Volume 8: Seismic Engineering ◽

10.1115/pvp2013-97451 ◽

2013 ◽

Author(s):

Kazuhiko Hiramoto ◽

Taichi Matsuoka ◽

Katsuaki Sunakoda

Keyword(s):

Control System ◽

Active Control ◽

Variable Parameter ◽

Control Law ◽

Structural Systems ◽

Control Force ◽

Control Performance ◽

Control Devices ◽

Active Control System ◽

Control Output

As a method for semi-active control of structural systems, the active-control-based method that emulates the control force of a targeted active control law by semi-active control devices has been studied. In the active-control-based method, the semi-active control devices are not necessarily able to generate the targeted active control force because of the dissipative nature of those devices. In such a situation, the meaning of the targeted active control law becomes unclear in the sense of the control performance achieved by the resulting semi-active control system. In this study, a new semi-active control strategy that approximates the control output (not the control force) of the targeted active control is proposed. The variable parameter of the semi-active control device is selected at every time instant so that the predicted control output of the semi-active control system becomes close to the corresponding predicted control output of the targeted active control as much as possible. Parameters of the targeted active control law are optimized in the premise of the above “output emulation” strategy so that the control performance of the semi-active control becomes good and the “error” of the achieved control performance between the targeted active control and the semi-active control becomes small.

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