648 Vibration Analysis of the Magnetic Bearing-Backup bearing-Roter System : Effect of the Backup Bearing on the Dynamical Characteristics of the Rotor System During Deceleration Through the Major Critical Speed

2003 ◽  
Vol 2003 (0) ◽  
pp. _648-1_-_648-6_ ◽  
Author(s):  
Tsuyoshi INOUE ◽  
Mizuho INAGAKI ◽  
Juichi INOUE ◽  
Makoto HAYAKAWA ◽  
Yukio ISHIDA
Keyword(s):  
Vibration Analysis ◽  
Critical Speed ◽  
Magnetic Bearing ◽  
Rotor System ◽  
System Effect ◽  
Dynamical Characteristics

Research on Dynamic Characteristic of Rotor System for Small Maglev Wind Turbine Generator

2014 ◽  
Vol 953-954 ◽  
pp. 437-442
Author(s):  
Shi Min Peng ◽  
Ru Hao Dong ◽  
Bo Yu Li ◽  
Ming Xue Liu
Keyword(s):  
Wind Turbine ◽  
Critical Speed ◽  
Simulation Analysis ◽  
Magnetic Bearing ◽  
Rotor System ◽  
Characteristic Analysis ◽  
Turbine Generator ◽  
Wind Turbine Generator ◽  
Finite Element Software ◽  
Vibration Measuring

Aiming at the small magnetic wind turbine, finite element software ANSYS is used to establish the model of rotor system with passive magnetic bearing, and obtain the vibration mode and critical speed of rotor system in situations: free-free, rigid bearing, hybrid combination of elastic and rigid bearing. Experimental analysis of critical speed of the rotor system can be conducted with the testing platform built by the B&K Vibration Measuring System.The result shows that the simulation analysis are approximately agreed with the experiment result. The simulation analysis has instructive significance in the structure optimization of magnetic bearing and rotor system and provides basis for vibration characteristic analysis of permanent maglev wind turbine generator and dynamic characteristics of structure.

507 Nonlinear vibration analysis of repulsive magnetic bearing-rotor system

2004 ◽  
Vol 2004 (0) ◽  
pp. _507-1_-_507-6_
Author(s):  
Tsuyoshi INOUE ◽  
Yukio ISHIDA ◽  
Takeshi Tsumura
Keyword(s):  
Nonlinear Vibration ◽  
Vibration Analysis ◽  
Magnetic Bearing ◽  
Rotor System

125 Nonlinear Vibration Analysis of Magnetic Bearing-Rotor System

2005 ◽  
Vol 2005 (0) ◽  
pp. _125-1_-_125-6_
Author(s):  
Tsuyoshi INOUE ◽  
Yukio ISHIDA ◽  
Motoki SUGIYAMA
Keyword(s):  
Nonlinear Vibration ◽  
Vibration Analysis ◽  
Magnetic Bearing ◽  
Rotor System

scholarly journals Chaos of flexible rotor system with critical speed in magnetic bearing based on the improved precise Runge–Kutta hybrid integration

2018 ◽  
Vol 10 (9) ◽  
pp. 168781401880085 ◽  
Author(s):  
Xi Fang ◽  
Dongbo Zhang ◽  
Xiaoyu Zhang ◽  
Huachun Wu ◽  
Fei Gao ◽  
...  
Keyword(s):  
Critical Speed ◽  
Integration Method ◽  
Magnetic Bearing ◽  
Rotor System ◽  
Kutta Method ◽  
Hybrid Integration ◽  
Flexible Rotor ◽  
Runge Kutta Method ◽  
Runge Kutta ◽  
Bearing System

Magnetic rotor-bearing system has drawn great attention because of its several advantages compared to existent rotor-bearing system, and explicit Runge–Kutta method has achieved good results in solving dynamic equation. However, research on flexible rotor of magnetic bearing is relatively less. Moreover, explicit Runge–Kutta needs a smaller integral step to ensure the stability of the calculation. In this article, we propose a nonlinear dynamic analysis of flexible rotor of active magnetic bearing established by using the finite element method. The precise Runge–Kutta hybrid integration method and the largest Lyapunov exponent are used to analyze the chaos of the rotor system at the first- and second-order critical speed of the rotor. Experiment on chaos analysis has shown that compared with the explicit Runge–Kutta method, the precise Runge–Kutta hybrid integration method can improve the convergence step of calculation significantly while avoiding iterative solution and maintain high accuracy which is four times the increase of the integral step.

Vibration analysis of a misaligned rotor—coupling—bearing system passing through the critical speed

2001 ◽  
Vol 215 (12) ◽  
pp. 1417-1428 ◽  
Author(s):  
S Prabhakar ◽  
A S Sekhar ◽  
A R Mohanty
Keyword(s):  
Transient Response ◽  
Vibration Analysis ◽  
Critical Speed ◽  
Rotor System ◽  
Continuous Wavelet ◽  
The Finite Element Method ◽  
System A ◽  
Different Types ◽  
Stiffness And Damping ◽  
Bearing System

The transient response of a misaligned rotor—coupling—bearing system passing through the critical speed has been analysed by using the finite element method (FEM) for flexural vibrations. The coupling has been modelled in two ways: a frictionless joint and a joint with stiffness and damping. From the vibration analysis, the subcritical speeds at one-half, one-third and one-fourth the critical speed have been found when the misaligned rotor—coupling—bearing system passes through its critical speed. The continuous wavelet transform (CWT) has been used as a tool to extract the silent features from the time response of the rotor system. A parametric study has been carried out to investigate the transient response of this rotor system for different angular accelerations in different types of misalignment.

The Dynamics of a Cracked Rotor With an Active Magnetic Bearing

2001 ◽  
Author(s):  
Changsheng Zhu ◽  
David A. Robb ◽  
David J. Ewins
Keyword(s):  
Dynamic Characteristics ◽  
Critical Speed ◽  
Magnetic Bearing ◽  
Rotor System ◽  
Active Magnetic Bearing ◽  
Cracked Rotor ◽  
Harmonic Components ◽  
The Stability ◽  
Amb System ◽  
Cracked Rotor System

The dynamic characteristics of a cracked rotor with an active magnetic bearing (AMB) are theoretically analyzed in this paper. The effects of using optimal controller parameters on the dynamic characteristics of the cracked rotor and the effect of the crack on the stability of the active control system are discussed. It is shown that the dynamic characteristics of the cracked rotor with AMBs are clearly more complex than that of the traditional cracked rotor system. Adaptive control with AMBs may hide the fault characteristics of the cracked rotor, rather than helping to diagnose a crack; this will depend on the controller strategy used. It is very difficult to detect a crack in the AMB-rotor system when the vibration of the rotor system is fully controlled. Only the super-harmonic components of 2X and 3X revolution in the sub-critical speed region can be used as a index to detect a crack in the rotor–AMB system. If the effect of the crack is not considered in designing the controller, then the AMB-rotor system will lose its stability in some cases when cracks appear.

scholarly journals Theoretical Vibration Analysis on 600 Wh Energy Storage Flywheel Rotor—Active Magnetic Bearing System

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Jing-na Liu ◽  
Zheng-yi Ren ◽  
Shan-wei Wu ◽  
Yin-long Tang
Keyword(s):  
Energy Storage ◽  
Vibration Analysis ◽  
Magnetic Bearing ◽  
Rotor System ◽  
Moment Of Inertia ◽  
Active Magnetic Bearing ◽  
Campbell Diagram ◽  
Future Design ◽  
Polar Moment ◽  
Flywheel Rotor

This paper shows a theoretical vibration analysis regarding the controller’s parameters and the gyroscopic effect, based on a simplified rotordynamic model. Combined with 600 Wh energy storage flywheel rotor system mathematical model, the Campbell diagram of the rotor system was obtained by the calculation of the whirl frequency under different parameters of the controller in MATLAB to analyze the effect of the controller parameter on the whirl frequency and to limit the operating speed and acceleration or deceleration of the rotor. The result of the analysis can be used to set the support position of the rotor system, limit the ratio of transverse moment of inertia and the polar moment of inertia, and direct the flywheel prototype future design. The presented simplified rotordynamic model can also be applied to rotating machines.

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