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Статті в журналах з теми "Active magnetic levitation"

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Автор: Grafiati

Опубліковано: 14 березня 2023

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1

Prada, Erik. "DETERMINATION OF TRANSFER FUNCTION OF MAGNETIC LEVITATION MODEL AND EXPERIMENTAL VERIFICATION OF OPTICAL SENSOR." TECHNICAL SCIENCES AND TECHNOLOGIES, no. 4(18) (2019): 148–54. http://dx.doi.org/10.25140/2411-5363-2019-4(18)-148-154.

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Анотація:

Urgency of the research. The potential of controlling the position of levitating objects has great application in deposition and in various positioning systems. Magnetic levitation eliminates direct mechanical friction between moving parts. Target setting. The measurement shielding method used is one of the methods of determining the position of a levitating object. By combining positioning and regulating elements, we achieve a feedback control. The use of a given type of measurement has advantages in places where the use of other methods is not appropriate. Actual scientific researches and issues analysis. The problem of magnetic levitation is addressed by several research laboratories with a direct connection to practice. The problem that is currently solved within magnetic levitation is the regulation of the levitating object using various types of regulators. The research objective. Derivation of mathematical model of magnetic levitation and examination of nonlinear system followed by linearization by Taylor series. Experimental determination of characteristics and dependence between object position, voltage and current. The statement of basic materials. The position of the levitating object is determined by the shading of the optical sensor. The light source is a laser light. Conclusions. In this work we defined the mathematical model of the magnetic levitation system and subsequently derived the transfer function of the levitation system and the position sensor. From the experimental verification of the shadow method for the determination of the position of the levitating object and the consequent need for regulation, we found that the dependence of the position of the levitating object on current and voltage on the photodiode is linear in the active region.

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2

Vischer, D., and H. Bleuler. "Self-sensing active magnetic levitation." IEEE Transactions on Magnetics 29, no. 2 (March 1993): 1276–81. http://dx.doi.org/10.1109/20.250632.

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3

Green, Scott A., and Kevin C. Craig. "Robust, Digital, Nonlinear Control of Magnetic-Levitation Systems." Journal of Dynamic Systems, Measurement, and Control 120, no. 4 (December 1, 1998): 488–95. http://dx.doi.org/10.1115/1.2801490.

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Анотація:

This paper presents a robust, adaptive, nonlinear controller for a class of magnetic-levitation systems, which includes active-magnetic bearings. The controller is analytically and experimentally shown to be superior to a classical linear control system in stability, control effort, step-response performance, robustness to parameter variations, and force-disturbance rejection performance. Using an adaptive backstepping approach, a Lyapunov function is generated along with an adaptive control law such that the nonlinear, closed-loop, continuous system is shown to guarantee stability of the equilibrium and convergence of the parameter estimates to constant values. The control system error coordinates are proven to be bounded in the presence of a bounded force disturbance input. The novelty of this controller is that it is digitally implemented using Euler integrators with anti-windup limits, it is single-input-single-output requiring only a measurement of the position of the levitating object, and it is designed to adaptively estimate not only the uncertain model parameters, but also the constant forces applied to the levitating object in order to ensure robustness to force disturbances. The experimental study was conducted on a single-axis magnetic-levitation device. The controller is shown to be applicable to active-magnetic bearings, under specific conditions, as well as any magnetic-levitation system that can be represented in output-feedback form.

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4

Zheng, Zhongqiao, and Minzheng Xu. "Active magnetic levitation guide based on magnetic damping control." Modern Physics Letters B 31, no. 19-21 (July 27, 2017): 1740015. http://dx.doi.org/10.1142/s0217984917400152.

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Анотація:

With the application of active magnetic levitation technology, flutter is a problem in the planar multi-point support system, which reduces the bearing capacity and the control precision, and it is difficult to apply advanced control strategies. Therefore, a new method called magnetic damping control is proposed to solve the flutter problem, which can make active magnetic levitation guide to run smoothly.

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5

Zheng, Zhongqiao, Xiaojing Wang, Yanhong Zhang, and Jiangsheng Zhang. "Research on Neural Network PID Quadratic Optimal Controller in Active Magnetic Levitation." Open Mechanical Engineering Journal 8, no. 1 (March 21, 2014): 42–47. http://dx.doi.org/10.2174/1874155x01408010042.

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Анотація:

In response to the uncertainty, nonlinearity and open-loop instability of active magnetic levitation control system, a neural network PID quadratic optimal controller has been designed using optimum control theory. By introducing supervised Hebb learning rule, constraint control for positioning errors and control increment weighting are realized by adjusting weighting coefficients, using weighed sum-squares of the control increment and the deviation between actual position and equilibrium position of the rotor in active magnetic levitation system as objective function. The simulation results show that neural network PID quadratic optimal controller can maintain the stable levitation of rotor by effectively improving static and dynamic performances of the system, so as to maintain the stable levitation of rotor in active magnetic levitation system which has stronger anti-jamming capacity and robustness.

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6

Feichtinger, F., S. Clara, A. O. Niedermayer, T. Voglhuber-Brunnmaier, and B. Jakoby. "Ball Viscometer Using Active Magnetic Levitation." Procedia Engineering 168 (2016): 1525–28. http://dx.doi.org/10.1016/j.proeng.2016.11.452.

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7

Pujol-Vázquez, Gisela, Alessandro N. Vargas, Saleh Mobayen, and Leonardo Acho. "Semi-Active Magnetic Levitation System for Education." Applied Sciences 11, no. 12 (June 8, 2021): 5330. http://dx.doi.org/10.3390/app11125330.

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Анотація:

This paper describes how to construct a low-cost magnetic levitation system (MagLev). The MagLev has been intensively used in engineering education, allowing instructors and students to learn through hands-on experiences of essential concepts, such as electronics, electromagnetism, and control systems. Built from scratch, the MagLev depends only on simple, low-cost components readily available on the market. In addition to showing how to construct the MagLev, this paper presents a semi-active control strategy that seems novel when applied to the MagLev. Experiments performed in the laboratory provide comparisons of the proposed control scheme with the classical PID control. The corresponding real-time experiments illustrate both the effectiveness of the approach and the potential of the MagLev for education.

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8

Feichtinger, Friedrich, Stefan Clara, Alexander O. Niedermayer, Thomas Voglhuber-Brunnmaier, and Bernhard Jakoby. "Active magnetic levitation and 3-D position measurement for a ball viscometer." Journal of Sensors and Sensor Systems 5, no. 2 (December 22, 2016): 447–55. http://dx.doi.org/10.5194/jsss-5-447-2016.

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Анотація:

Abstract. We present a new technique for 3-D position sensing and active magnetic levitation of a steel ball for use in a levitating ball viscometer. In order to achieve a stable levitation, a very sensitive positioning measurement system is mandatory. For this task the differential transformer principle was chosen to realize a 3-D position measurement. This leads to a purely magnetic sensor and actuator system without the need for other transducer types such as optical readout. The actuation utilizes power efficient switch-mode electronic circuitry which opens the possibility of upscaling the device, if demanded, for future applications. It is shown that this switch-mode actuation can be combined directly with the position measurement when special switching patterns are applied. A position resolution of ∼ 100 µm in all three axial directions at a sample rate of 476.19 Hz is achieved. For viscosity sensing, the steel ball is magnetically driven to orbital movements of variable revolution frequency of up to 2.5 Hz within a fluid chamber. The frequency response is analyzed and related to the shear viscosity of the fluid under test. As a proof of concept, measurements in various viscous liquids were performed with the prototype, showing promising results in the range of 1–10 mPa s. The principle may also be of interest for applications beyond viscosity sensing, such as fluid mixers, or as actuators in microfluidic devices.

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9

Liu, Guancheng, Yonghua Lu, Jiajun Xu, Zhanxiang Cui, and Haibo Yang. "Magnetic Levitation Actuation and Motion Control System with Active Levitation Mode Based on Force Imbalance." Applied Sciences 13, no. 2 (January 4, 2023): 740. http://dx.doi.org/10.3390/app13020740.

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Анотація:

Accurate large-displacement magnetic levitation actuation and its stability remain difficult in non-liquid environments. A magnetic levitation actuation and motion control system with active levitation mode is proposed in this paper. The actuating force of the system is generated by the external magnetic field. A neural network proportion-integration-differentiation (PID) controller is designed for active actuation, and a force imbalance principle is built for the step motion mode. Dual electromagnetic actuators are configured to generate a superimposed magnetic field, ensuring that the electromagnetic force on the ball is more uniform and stable than single actuators. Dual-hall-structure sensors are used to measure displacement, thereby reducing overshoot and ensuring stability whilst motivating the ball. Due to the high adaptability of the neural network to complex systems with nonlinear and ambiguous models, the PID controller composed of neurons has stronger adaptability through tuning the PID controller parameters automatically. Furthermore, the proposed controller can solve the shortcoming that the deviation between the controlled object and the steady-state operating point increases and the tracking performance deteriorates rapidly. The strong robustness and stability in active levitation and motion control is achieved during both ascending and descending processes.

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10

Castellanos Molina, Luis, Renato Galluzzi, Angelo Bonfitto, Andrea Tonoli, and Nicola Amati. "Magnetic Levitation Control Based on Flux Density and Current Measurement." Applied Sciences 8, no. 12 (December 8, 2018): 2545. http://dx.doi.org/10.3390/app8122545.

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Анотація:

This paper presents an active magnetic levitation application that exploits the measurement of coil current and flux density to determine the displacement of the mover. To this end, the nonlinear behavior of the plant and the physical sensing principle are modeled with a finite element approach at different air gap lengths and coil currents. A linear dynamic model is then obtained at the operating point as well as a linear relation for the displacement estimates. The effectiveness of the modeling approach and the performance of the sensing and control techniques are validated experimentally on an active magnetic levitation system. The results demonstrate that the solution is able to estimate the displacement of the mover with a relative error below 3% with respect to the nominal air gap. Additionally, this approach can be exploited for academic purposes and may serve as a reference to implement simple but accurate active magnetic levitation control using low-cost, off-the-shelf sensors.

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11

WATANABE, Katsuhide, Yoichi KANEMITSU, Shinji HARA, and Takahide HAGA. "Micro-Vibration Control by Active Magnetic Levitation System." Transactions of the Japan Society of Mechanical Engineers Series C 68, no. 669 (2002): 1405–13. http://dx.doi.org/10.1299/kikaic.68.1405.

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12

Zhang, Jiaji, Xuesong Mei, Dongsheng Zhang, Gedong Jiang, and Qing Liu. "Application of decoupling fuzzy sliding mode control with active disturbance rejection for MIMO magnetic levitation system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 2 (May 18, 2012): 213–29. http://dx.doi.org/10.1177/0954406212447225.

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Анотація:

Magnetic levitation techniques have been used to eliminate friction due to mechanical contact, decrease the maintaining cost and achieve high-precision positioning. Although there are many studies on the single degree-of-freedom magnetic levitation control algorithms, it is difficult to achieve excellent control performance using classical control methods for the multiple-in-multiple-out magnetic levitation system because of the coupling in the dynamic system and the nonlinearity of the electromagnetic force. This article presents a 3 degrees-of-freedom magnetic suspension stage. At first the dynamic model of the stage is derived; then a nonlinear intelligent decoupling controller is developed to stabilize the levitation system. The control architecture consists of three components: (1) fuzzy sliding mode technique for the uncertainty in the system parameter; (2) force distribution for decoupling; (3) extended state observer for compensating the system disturbance. Finally experiments are designed to verify the effectiveness of the proposed controller. Experimental results show that compared with the classical proportional–integral–derivative controller, the proposed controller provides excellent transient response performance and the system is robust against the parameter uncertainty and external disturbance.

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13

Polunin, V. M., P. A. Ryapolov, and E. V. Sheldeshova. "Mechanics of magnetic fluid active element in strong magnetic field." EPJ Web of Conferences 185 (2018): 09005. http://dx.doi.org/10.1051/epjconf/201818509005.

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Анотація:

Measurements and theoretical analysis of the processes of static displacement and oscillations of the magnetic fluid column confined by magnetic levitation in a strong magnetic field in a horizontally placed tube are carried out. The calculations of the saturation magnetization, made on the basis of the obtained results of the displacement and the oscillation frequency for the sample of the magnetic fluid under study, are in good agreement with the experimental data. The described technique is of interest when studying saturation magnetization, magnetophoresis, aggregation of nanoparticles and their temporal dependence in magnetic colloids.

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14

Li, Jiangxiong, Jiaqiang Pan, and Qiang Hu. "Active control of vibration of a magnetic levitation platform." Journal of the Acoustical Society of America 97, no. 5 (May 1995): 3340. http://dx.doi.org/10.1121/1.412747.

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15

Lapidus, Boris M. "Magnetic levitation as the fundamental basis for superfast vacuum levitation transport technologies." Transportation Systems and Technology 4, no. 3 (November 2, 2018): 26–35. http://dx.doi.org/10.17816/transsyst20184326-35.

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Анотація:

The article reviews the strategic trends of transport development that meet the modern requirements of the economy and society. It was revealed that the key trend is to increase the speed of traffic. To achieve breakthrough results in this direction, it is proposed to use magnetic levitation in combination with the use of a vacuum environment - the creation of vacuum-levitation transport systems. It is noted that the Joint Scientific Council of JSC Russian Railways formed the requirements for the creation of such systems and focused attention on the problem of the socio-economic efficiency of its creation. It is concluded that rail transport, in the interests of its strategic competitiveness, should be the initiator and active participant in the creation of vacuum-levitation transport systems, which, in turn, can become an important incentive for integrating the efforts of the world scientific community.

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16

Zhang, Yanhong. "Active magnetic bearing system based on sliding mode control." Modern Physics Letters B 31, no. 19-21 (July 27, 2017): 1740013. http://dx.doi.org/10.1142/s0217984917400139.

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Анотація:

A new sliding mode variable structure control algorithm suitable for active magnetic bearing is proposed, which is widely used for nonlinear control system. The model and controller is designed, simulation and experimental parts are also made, according to the switching function and the sliding mode control law. The current of electromagnet is adjusted to realize stable levitation of the rotor. The experimental result shows that the sliding mode variable structure controller is an effective way for magnetic bearing control, and the active magnetic bearing system is a highly nonlinear and advanced control method that can reduce the setting time and the cost.

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17

Yu, Wen Tao, Hong Wei Li, Shu Qin Liu, and Yun Peng Zhang. "The Application Design of Inductance Sensor in Active Magnetic Bearing." Applied Mechanics and Materials 364 (August 2013): 257–61. http://dx.doi.org/10.4028/www.scientific.net/amm.364.257.

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Анотація:

The sensor is an important part of the active magnetic bearing system, which directly affects the performance of the entire system. Compared with the eddy current sensor, inductive sensor has the advantages of low cost, high sensitivity, and is not sensitive to the electromagnetic environment; Influenced by the ambient temperature is small. In this paper, design research from two aspects of the sensor structure and circuit, and the sensor was tested and successfully used in maglev blower. This sensor design method can also be applied on other active magnetic bearings, such as magnetic levitation heart pumps, etc.

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18

Piłat, Adam. "Design and Analysis of Elliptic Rotor Suspended in Active Magnetic Bearing." Solid State Phenomena 147-149 (January 2009): 410–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.410.

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Анотація:

With this paper the suspension of an elliptic rotor is considered. The operating area, electromagnetic forces and the rotor shape are analyzed along with the static and dynamic properties of the levitated rotor to obtain the required performance. The linear and non-linear stabilizing controllers are suggested to obtain stable levitation. An interdisciplinary approach for modelling and simulation tasks is proposed.

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19

PASHKOV, Nikolai N. "EQUATION OF MOTION MAGNETIC LEVITATION ROLLING STOCK." Transportation systems and technology 1, no. 1 (March 15, 2015): 59–69. http://dx.doi.org/10.17816/transsyst20151159-69.

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Анотація:

This article deals with the problem of control the trajectory of the crew magnetic levitation relative trajectory of the software regarding the track structure of the perturbation of the gravitational and magnetic fields levitation systems, lateral stabilization and traction. The crew is presented as a system of rigid bodies, whose motion is subject to gravitational and electromagnetic forces. The spatial displacement with limited powers of levitation and lateral stabilization regarding a discrete track structure are selected by drawing up the estimated equations of the dynamics of the crew as inertial coordinates of the centers of mass of solids. The coordinates of any point on the carriage in a local coordinate system are converted in the coordinate system associated with the center of mass of the crew to bring the point of application of external force to the center of mass of the crew. A general model of the dynamics of the crew is based on the equation of Lagrange-Maxwell which binds to the active mass of the external forces of gravity that govern the electromagnetic force, the force of inertia and friction. The kinetic energy of the mechanical system is defined by the velocity projections on the axis of the fixed coordinate system as a quadratic form. The crew simulated magneto elastic coupling with the track structure changing the potential energy of magnetic levitation and lateral stabilization at the deformation of the object or the displacement and rotation of the center of mass of the crew in three-dimensional space. The inverse problem of dynamics is solved to determine the control forces for a given trajectory of the crew magnetic levitation. The equations of motion the crew on a magnetic cushion are linearized regarding increments relative coordinates of the centers of mass of the crew vector and presented in the form of equations of the phase space of states.

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20

Wu, Qian Qian, Rong Qiang Liu, Hong Hao Yue, Zong Quan Deng, and Hong Wei Guo. "Design and Optimization of Magnetic Levitation Actuators for Active Vibration Isolation System." Advanced Materials Research 774-776 (September 2013): 168–71. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.168.

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Анотація:

Actuator based on Lorentz force exhibits excellent isolating performance with its non-contact characteristic, especially during frequency bandwidth below 5Hz. In this paper, mathematical model of the magnetic levitation actuator is constructed. In order to obtain better performance, parametric design of the structure of magnetic actuator is carried out and a multi-objective optimization method is proposed to maximize Lorentz force and minimize the mass of coil on the basis of genetic algorithm in the optimization process. A designing optimization program is developed, by which optimized parameters of magnetic actuator with maximal actuator force and minimal mass of coil can be identified to conduct experiment on ground. Compared with initial values in an instance, the optimized method is proven to be feasible and has the value of practical application.

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21

ZENG, Li. "Research on Mechanism of Inductive Active Magnetic Levitation Spherical Driving Joint." Journal of Mechanical Engineering 51, no. 11 (2015): 24. http://dx.doi.org/10.3901/jme.2015.11.024.

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22

Pesch, Alexander, та Jerzy Sawicki. "Active Magnetic Bearing Online Levitation Recovery through μ-Synthesis Robust Control". Actuators 6, № 1 (8 січня 2017): 2. http://dx.doi.org/10.3390/act6010002.

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23

NAKADAI, Shigeyuki, and Masafumi MORITA. "504 Self-Powered Active Vibration Control for Repulsive Magnetic Levitation System." Proceedings of the Dynamics & Design Conference 2006 (2006): _504–1_—_504–4_. http://dx.doi.org/10.1299/jsmedmc.2006._504-1_.

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24

NAKADAI, Shigeyuki, and Yuchiroh HORI. "Active Vibration Control for Repulsive Magnetic Levitation System using Regenerated Energy." Proceedings of Conference of Kanto Branch 2002.8 (2002): 225–26. http://dx.doi.org/10.1299/jsmekanto.2002.8.225.

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25

Zhou, F. B., R. Gerber, S. Whitley, T. Twardowski, and D. J. Witts. "The levitation of the SIXEP pump shaft using active magnetic bearings." IEEE Transactions on Magnetics 31, no. 6 (1995): 4196–98. http://dx.doi.org/10.1109/20.489924.

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26

KOBAYASHI, Yoshimitsu, Yuki OGURA, Kenta ENYA, and Minoru SASAKI. "2P1-A08 Compensation of Magnetic Sensor used on an Active Magnetic Levitation Conveyance System." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2015 (2015): _2P1—A08_1—_2P1—A08_4. http://dx.doi.org/10.1299/jsmermd.2015._2p1-a08_1.

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27

Yu, Tongtong, Zhizhou Zhang, Yang Li, Weilong Zhao, and Jinchu Zhang. "Improved active disturbance rejection controller for rotor system of magnetic levitation turbomachinery." Electronic Research Archive 31, no. 3 (2023): 1570–86. http://dx.doi.org/10.3934/era.2023080.

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Анотація:

<abstract> <p>The rotor of the magnetic suspension turbomachinery is supported by the magnetic suspension bearing without contact and mechanical friction, which directly drives the high-efficiency fluid impeller. It has the advantages of high efficiency, low noise, less fault and no lubrication. However, the system often has some unknown mutation, time variation, load perturbation and other un-certainties when working, and the traditional Proportion Integration Differentiation (PID) control strategy has great limitations to overcome the above disturbances. Therefore, this paper firstly establishes a mathematical model of the rotor of magnetic levitation turbomachinery. Then, a linear active disturbance rejection controller (LADRC) is presented, which can not only improve the above problems of PID control, but also avoid the complex parameter tuning process of traditional nonlinear active disturbance rejection control (ADRC). However, LADRC is easy to induce the overshoot of the system and cannot filter the given signal. On this basis, an improved LADRC with a fast-tracking differentiator (FTD) is proposed to arrange the transition process of input signals. The simulation results show that compared with the traditional PID controller and single LADRC, the improved linear active disturbance rejection control method with fast tracking differentiator (FTD-LADRC) can better suppress some unknown abrupt changes, time variation and other uncertainties of the electromagnetic bearing-rotor system. At the same time, the overshoot of the system is smaller, and the parameters are easy to be set, which is convenient for engineering application.</p> </abstract>

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28

Chen, Shyh-Leh, Yi-Tsung Li, Chin-Hsiang Lin, and Chao-Yun Chen. "Effects of Imperfect Assembly and Magnetic Properties on the Three-Pole AMB System." Applied Sciences 13, no. 1 (December 27, 2022): 347. http://dx.doi.org/10.3390/app13010347.

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Анотація:

This study is concerned with a three-pole active magnetic bearing (AMB) system with assembly error and non-uniform flux distribution. The assembly error, which is the result of the misalignment of the back-up bearing and the stator of AMB, induces strong nonlinear uncertainty in the AMB dynamics. The non-uniform flux distribution, which is mainly due to non-uniform material properties, manufacturing errors, etc., makes the magnetic force model more complicated. A stable-levitation controller is designed in consideration of the above factors. The controller is designed using the method of feedback linearization and integral sliding mode control (ISMC). Both simulation and experimental results indicate that the rotor can be levitated to the center of the back-up bearing, verifying the effectiveness of the proposed stable-levitation controller.

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29

Kim, Seok-Kyoon. "Nonlinear Position Stabilizing Control with Active Damping Injection Technique for Magnetic Levitation Systems." Electronics 8, no. 2 (February 17, 2019): 221. http://dx.doi.org/10.3390/electronics8020221.

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Анотація:

This proposal suggests a novel nonlinear position-stabilizing controller for magnetic levitation (MAGLEV) applications. The proposed scheme is devised by combining the active damping injection technique and disturbance observers (DOBs), considering the inherent nonlinear dynamics, as well as parameter and load variations. The convergence and performance recovery properties are obtained by analyzing the closed-loop dynamics, which is the main contribution. The numerical verification confirms a considerable closed-loop robustness improvement, compared with the cascade-type feedback-linearization controller.

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30

Qiao, Xiaoli, and Xiaoping Tang. "The Stability of Magnetic Levitation Milling System Based on Modal Decoupling Control." Shock and Vibration 2020 (May 19, 2020): 1–9. http://dx.doi.org/10.1155/2020/7839070.

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Анотація:

Milling stability not only reduces the surface quality of the workpiece but also seriously restricts the high-speed development of CNC machine tools. The electric spindle rotor system with the active magnetic bearing has a strong gyro coupling effect, and with the increasing rotor speed, it will become a major unfavorable factor for the stability of the system during high-speed milling. The strong gyro coupling effect makes the stability region narrow at the time of high-speed milling. So, a modal decoupling control method that can reduce the effects of the gyro effect on the magnetic levitation milling system under high-speed milling is proposed. The effects of the gyro coupling of the magnetic bearing rotor on the milling stability region before and after the decoupling control are studied, which show that the modal decoupling control technology can reduce the effects of the gyro effect on the magnetic levitation milling system.

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31

Ito, Y., H. Ueda, K. Agatsuma, and A. Ishiyama. "Position Control of Active Magnetic Levitation using YBCO Bulk and Multiple Electromagnets." Journal of Physics: Conference Series 43 (June 1, 2006): 987–90. http://dx.doi.org/10.1088/1742-6596/43/1/241.

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32

Kou, Baoquan, Yiheng Zhou, Xiaobao Yang, Feng Xing, and He Zhang. "Electromagnetic and Mechanical Characteristics Analysis of a Flat-Type Vertical-Gap Passive Magnetic Levitation Vibration Isolator." Shock and Vibration 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/5327207.

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Анотація:

In this paper, we describe a flat-type vertical-gap passive magnetic levitation vibration isolator (FVPMLVI) for active vibration isolation system (AVIS). A dual-stator scheme and a special stator magnet array are adopted in the proposed FVPMLVI, which has the effect of decreasing its natural frequency, and this enhances the vibration isolation capability of the FVPMLVI. The structure, operating principle, analytical model, and electromagnetic and mechanical characteristics of the FVPMLVI are investigated. The relationship between the force characteristics (levitation force, horizontal force, force ripple, and force density) and major structural parameters (width and thickness of stator and mover magnets) is analyzed by finite element method. The experiment result is in good agreement with the theoretical analysis.

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33

Baranowski, Jerzy, and Paweł Piątek. "Observer-based feedback for the magnetic levitation system." Transactions of the Institute of Measurement and Control 34, no. 4 (March 11, 2011): 422–35. http://dx.doi.org/10.1177/0142331210389650.

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Control of active magnetic bearings is an important area of research. The laboratory magnetic levitation system can be interpreted as a model of a single axis of bearings and is a useful testbed for control algorithms. The mathematical model of this system is highly non-linear and requires careful analysis and identification. The system is observable from position measurements as long as the electromagnet is powered as shown during the research. Practically measurable signals are the position and the coil current. The velocity that is necessary for any stabilizing control usually is obtained by numerical differentiation of the position. A more sophisticated approach is to estimate the velocity with an observer. Efficient observer types for this system are high-gain and non-linear reduced observers. The velocity estimated by an observer can be effectively used instead of a derivative in PID control of the position. Such an approach substantially improves control quality and extends the range of system’s stable operation. Even greater improvement is introduced by the addition of the non-linear feedforward to the control structure. The best results, provided the model parameters are correctly identified, are obtained with a control system consisting of the PID controller, the high-gain observer and the non-linear feedforward.

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34

Reiners, Jan, and Berend Denkena. "Investigation on the Dynamic Behaviour of an Ultrasonic-Levitation Magnetic Guiding System." Advanced Materials Research 1140 (August 2016): 377–83. http://dx.doi.org/10.4028/www.scientific.net/amr.1140.377.

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Guiding systems for precision manufacturing machines have to fulfil high demands. Low compliance and the absence of friction is required to achieve a high production accuracy. This article presents a novel active guiding system based on the combination of ultrasonic levitation and magnetic actuators. Firstly, the combined actuator and its working principles are described. Subsequently, the concept for an active, frictionless and medium-free guiding system is outlined. In addition to the free degree of freedom (DOF) in guiding direction, the other 5 DOF are adjustable in order to improve the guides positioning accuracy. The experimental validation of the concept is conducted with a simplified prototype, acting as a 3 DOF adjustable planar guide. Finally, measured compliance frequency responses demonstrate the performance of this novel active guiding concept.

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35

Fedorova, Maria V. "Forecast demand for use magnetic levitation transport." Transportation Systems and Technology 6, no. 4 (December 30, 2020): 143–60. http://dx.doi.org/10.17816/transsyst202064143-160.

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Background: The analysis carried out and the forecasted development prospects of the Vsevolozhsk municipal district show the high socio-economic importance of this territory for St. Petersburg and the Leningrad region. This territory is intensively developing, new residential zones are being formed on it, enterprises are opening, new jobs are being created, and recreational zones are being organized. Active housing construction in the municipalities "City of Vsevolozhsk" and "Zanevskoye rural settlement" is accompanied by a significant increase in the population. According to the forecast, in 2041 the population of the municipal formation "City of Vsevolozhsk" will exceed 100 thousand people, of the "Zanevsky rural settlement" - 180 thousand people. The population of the municipalities of St. Petersburg included in the gravitational zone of the maglev transport line in the direction "Vsevolozhsk - St. Petersburg", in 2041 will increase by 1.4 times compared to 2015, amounting to 520 thousand people. The listed tendencies indicate that in the future the intensity of traffic flows will grow and the demand for the use of maglev passenger transport will increase. Aim: Putting into operation lines of magneto-transport vehicles in places of concentration of growing passenger flows, which will help to reduce travel time, meet freight requirements, improve the quality and increase travel safety when driving along dedicated lanes. Method: We have described the existing transport service system in Vsevolozhsk. The survey of passenger traffic on bus routes operating between Vsevolozhsk and St. Petersburg was carried out by two methods during the periods of morning and evening peaks, as well as during the inter-peak period: visual method and tabular method. The article gives a characteristic of the uneven distribution of passenger traffic at the Ladozhskaya metro station and the socio-economic characteristics of the pedestrian accessibility zone of stopping points, identifies the maximum passenger traffic and the need for rolling stock. Results: As the basis for the development of the transport system of urban agglomerations, it is proposed to use magnetolithic transport. For its operation, a special high-speed infrastructure and a new rolling stock are needed. In other words, there is a need for the development and economic evaluation of projects for the construction and operation of magnetolithic transport lines in the formation and implementation of transport strategies of modern urban agglomerations.

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36

Yang, Yan Li, and Zhen Xing Zhang. "Sliding Mode Variable Structure Control of Active Magnetic Bearings Using Boundary Layer Approach." Advanced Materials Research 411 (November 2011): 213–17. http://dx.doi.org/10.4028/www.scientific.net/amr.411.213.

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To solve the chattering problem caused by the general sliding mode control in the active magnetic bearing control, a boundary layer approach is used in the controller design in this paper. The dynamic model of the active magnetic bearing is built firstly, and then a saturation function is employed to substitute for the sign function in the controller based on the Lyapunov theory to approximately realize infinite gain with finite gain. Finally, the performance of the controller is simulated, and compared with the general sliding mode control. The results show that the disadvantage of chattering can be effectively reduced by using the boundary layer approach, the rotor-s quick adjusting and steady levitation are achieved, and the controller has high tracking precision and good robustness.

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37

Tseng, Chyuan-Yow, and Pi-Cheng Tung. "Dynamics of a Flexible Beam With Active Nonlinear Magnetic Force." Journal of Vibration and Acoustics 120, no. 1 (January 1, 1998): 39–46. http://dx.doi.org/10.1115/1.2893825.

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A simply supported beam is controlled in a contactless manner by the attractive force of magnetic actuators that are controlled by feedback signals from displacement and velocity sensors to stabilize the levitation. The equations of motion for the single mode of a beam’s model are used to show that due to the realistic nonlinear terms existing in the magnetic force, the resulting third-order system exhibits codimension-two bifurcations in which a limit cycle and a heteroclinic orbit are created. Using the bifurcation analysis, it was determined how feedback gains influenced the behavior of transverse vibrations of the beam and the feedback gains producing stability were found. The largest region of attraction of those stable regions is showed to exist at certain feedback gain combination. The analytical approach based on the single mode simplification system was proven to be feasible via the numerical simulation of the governing nonlinear PDE. According to the results of the analysis, due to the nonlinear magnetic force, feedback gains for the system must be selected carefully.

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38

OKADA, Yohji. "Active Vibration and Noise Control. Vibration Control of Magnetic Levitation and Flexible Rotor Magnetic Bearing System." Journal of the Japan Society for Precision Engineering 64, no. 5 (1998): 664–68. http://dx.doi.org/10.2493/jjspe.64.664.

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39

Zhang, Yanhong, Dean Zhao, Jiansheng Zhang, and Zhongqiao Zheng. "Research on Improving Precision and Stability of Active Magnetic Levitation Feeding Guide System." Open Automation and Control Systems Journal 6, no. 1 (December 19, 2014): 302–10. http://dx.doi.org/10.2174/1874444301406010302.

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40

OSA, Masahiro, Toru MASUZAWA, Takuya SAITO, and Eisuke TATSUMI. "Magnetic levitation performance of miniaturized magnetically levitated motor with 5-DOF active control." Mechanical Engineering Journal 4, no. 5 (2017): 17–00007. http://dx.doi.org/10.1299/mej.17-00007.

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41

Sheng, Xiaochao, Chia-Hsiang Menq, and Tao Tao. "Active damping and disturbance rejection control of a six-axis magnetic levitation stage." Review of Scientific Instruments 89, no. 7 (July 2018): 075109. http://dx.doi.org/10.1063/1.5010432.

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42

Park, Yonmook. "Design and implementation of an electromagnetic levitation system for active magnetic bearing wheels." IET Control Theory & Applications 8, no. 2 (January 16, 2014): 139–48. http://dx.doi.org/10.1049/iet-cta.2013.0450.

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43

TANAKA, Naoyuki, Naoki UCHIYAMA, Toru WATANABE, and Kazuto SETO. "Levitation and Vibration Control of a Flexible Rotor by Using Active Magnetic Bearing." Journal of System Design and Dynamics 3, no. 4 (2009): 551–62. http://dx.doi.org/10.1299/jsdd.3.551.

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44

FUJIOKA, Takehiko, Ken'ichi KODAMA, and Shinpei YAMAMOTO. "Active Control of Primary Suspension and Secondary Suspension (applied to Magnetic Levitation Vehicle)." Transactions of the Japan Society of Mechanical Engineers Series C 58, no. 556 (1992): 3468–72. http://dx.doi.org/10.1299/kikaic.58.3468.

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45

Pilat, Adam Krzysztof. "An Synergistic Dynamic 2D FEM Model of an Active Magnetic Bearing with Three Electromagnets." Solid State Phenomena 214 (February 2014): 106–12. http://dx.doi.org/10.4028/www.scientific.net/ssp.214.106.

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This elaboration presents a dynamic model of an Active Magnetic Bearing (AMB) developed in COMSOL Multiphysics. The electromagnetic field is calculated on the basis of Partial Differential Equations (PDEs). The calculated electromagnetic force is applied to the rotor, which is free to move. The Arbitrary Lagrangian-Eulerian (ALE) method for mesh deformation is applied to achieve rotor motion on the bearing plane. The planar rotor motion is described by a set of Ordinary Differential Equations (ODEs) solved in parallel to the electromagnetic field calculations. To enable rotor levitation, three local PD controllers are applied. The mathematical formulas of the control action are coded in the form of COMSOL equations and embedded into the rotor motion ODEs.

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46

Ahmad, Sarvat M., Osman A. Ahmed, and Zaharuddin Mohamed. "VIBRATION INDUCED FAILURE ANALYSIS OF A HIGH SPEED ROTOR SUPPORTED BY ACTIVE MAGNETIC BEARINGS." Transactions of the Canadian Society for Mechanical Engineering 39, no. 4 (December 2015): 855–66. http://dx.doi.org/10.1139/tcsme-2015-0068.

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Active Magnetic Bearings (AMBs) are increasingly used in various industries and a quick re-levitation of AMBs supported high speed flexible rotor is necessary in case of vibration induced failure. A robust fault diagnosis algorithm is presented to detect suspected saturation type of nonlinearity associated with a power amplifier. A five degree-of-freedom AMB system consisting of four opposing pair of radial magnets and a pair of axial magnets is considered. In this paper failure of an industrial grade AMB system is investigated using Sinusoidal Input Describing Function (SIDF) method. SIDF predicts the gain and frequency at which failure occurs. It is demonstrated that the predicted frequency is in agreement with the frequency at which failure occurs.

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47

Yanhong, Zhang, Zheng Zhongqiao, Zhang Jiansheng, and Yin Lei. "Research on PID Controller in Active Magnetic Levitation Based on Particle Swarm Optimization Algorithm." Open Automation and Control Systems Journal 7, no. 1 (October 20, 2015): 1870–74. http://dx.doi.org/10.2174/1874444301507011870.

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48

Tanaka, Naoyuki, Masaki Murata, Shigeki Fukui, Hiroshi Tajima, Kazuto Seto, and Toru Watanabe. "21613 Levitation and Vibration Control of a Flexible Rotor by using Active Magnetic Bearing." Proceedings of Conference of Kanto Branch 2007.13 (2007): 3–4. http://dx.doi.org/10.1299/jsmekanto.2007.13.3.

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49

Kamel, M., A. Kandil, W. A. El-Ganaini, and M. Eissa. "Active vibration control of a nonlinear magnetic levitation system via Nonlinear Saturation Controller (NSC)." Nonlinear Dynamics 77, no. 3 (March 8, 2014): 605–19. http://dx.doi.org/10.1007/s11071-014-1323-3.

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50

Lösch, F., and Ph Bühler. "Identification and Self Tuning Control for Active Magnetic Bearing Systems: Levitation of Unknown Rotors." PAMM 1, no. 1 (March 2002): 242. http://dx.doi.org/10.1002/1617-7061(200203)1:1<242::aid-pamm242>3.0.co;2-n.

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