Finite Element Analysis and Experimental Validation of Transfer Function of Rotating Shaft System With Both an Open Crack and Anisotropic Support Stiffness

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Qiang Yao ◽  
Tsuyoshi Inoue ◽  
Shota Yabui
Keyword(s):  
Finite Element ◽  
Transfer Function ◽  
Transfer Functions ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Open Crack ◽  
Rotating Shaft ◽  
Element Analysis ◽  
Shaft System ◽  
Stiffness Anisotropy

In this paper, transfer function of rotating shaft system for detecting transverse open crack is developed. Rotating shaft system is modeled using one-dimensional finite element method (1D-FEM), and quantitative analysis is performed. Open crack is modeled as weak asymmetry rotating with shaft's rotation. It is known that, when both open crack and support stiffness anisotropy coexist, various frequency components of shaft's vibration are generated through their successive interaction. This paper evaluates the order of these components, and concludes that first five main components are enough to investigate interaction of open crack and support stiffness anisotropy. Then, five sets of transfer functions for these components are derived. The validity of this set of transfer functions is confirmed by numerical simulation. Moreover, excitation experiment utilizing active magnetic bearing (AMB) is performed, and the validity of derived transfer function was verified experimentally.

The Analysis of Radial Magnetic Bearing’s Magnetic Field in Active Magnetic Bearing Electric Spindle Unit

2011 ◽  
Vol 291-294 ◽  
pp. 1593-1599
Author(s):  
Ping Liao ◽  
Su Yang Ma ◽  
Guo Qing Wu ◽  
Jing Feng Mao ◽  
An Dong Jiang
Keyword(s):  
Magnetic Field ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Principal Axis ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Affecting Factors ◽  
Element Analysis ◽  
Bearing Unit ◽  
Spindle Unit

Introduced the working principle of active magnetic bearing unit and took the electric spindle with 5.5kW for example, finite element analysis of the magnetic fields of radical magnetic bearing was analyzed through finite element analysis by ANSYS software to find out the variation of magnetic field distribution and affecting factors. Analysis results showed that radical magnetic bearing had small leakage magnetic field, the principal axis’ maximum offset from the ideal center line was 0.0025mm and the principal axis had superior radical running accuracy when the circularity of supporting journal on principal axis was 0.003mm, the unilateral air-gap value was 0.3mm while the principal axis suspended normally and the inside track’ circularity of magnetic pole was 0.007mm. It can meet the working requirements of precision machine tool. The research results provided theoretical basis for structural optimization of the active magnetic bearing unit.

The Structure and Finite Element Analysis of a New Type of Maglev Wind Generator

2014 ◽  
Vol 703 ◽  
pp. 436-439
Author(s):  
Si Zeng ◽  
Yu Xin Sun ◽  
Yi Du ◽  
Huang Qiu Zhu ◽  
Xian Xing Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Degrees Of Freedom ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Direct Drive ◽  
Element Analysis ◽  
Wind Generator ◽  
New Type ◽  
The Cost

Abstract. In this paper, a new type of maglev wind generator is proposed. The working principle, structure characteristics and the finite element analysis of the new maglev wind turbine are introduced. The generator consists of a 2 degrees of freedom (DOF) maglev generator and a 3 DOF hybrid magnetic bearing. An eight poles active magnetic bearing with external rotor is added into traditional direct-drive permanent magnet wind generator. The rotor ring is hollowed, which can leads to the self-decoupling for magnetic fields between power generation system and suspension system. Compared with the conventional maglev wind generator, the proposed generator not only shows the same advantages of traditional maglev wind turbines, but also improves the axial length utilization and decrease the cost of motor control.

Comparison of Magnetic Field Parameters Obtained from 2D and 3D Finite Element Analysis for an Active Magnetic Bearing

2014 ◽  
Vol 214 ◽  
pp. 130-137 ◽  
Author(s):  
Dawid Wajnert
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Numerical Models ◽  
Three Dimensional ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Element Analysis ◽  
3 Dimensional ◽  
Three Dimensional Models ◽  
Magnetic Field Computation

The paper presents numerical modeling of 8-pole radial active magnetic bearing based on 2-dimensional and 3-dimensional magnetic field computation with nonlinear characteristic of magnetic material. In this work has been used numerical models based on finite element methods. In paper has been specified differences between two and three dimensional models. Results of numerical calculation have been verified by measurement of magnetic field distribution and inductances of windings.

Numerical Prediction of Noise Radiated From a Panel Subjected to Boundary Layer Excitation

1999 ◽  
Author(s):  
Michael Allen ◽  
Nickolas Vlahopoulos
Keyword(s):  
Boundary Layer ◽  
Finite Element ◽  
Boundary Element ◽  
Transfer Functions ◽  
Element Model ◽  
Acoustic Response ◽  
Spectral Densities ◽  
Wind Noise ◽  
Element Analysis ◽  
Power Spectral

Abstract In this paper an algorithm is developed for combining finite element analysis and boundary element techniques in order to compute the noise radiated from a panel subjected to boundary layer excitation. The excitation is presented in terms of the auto and cross power spectral densities of the fluctuating wall pressure. The structural finite element model for the panel is divided into a number of sub-panels. A uniform fluctuating pressure is applied as excitation on each sub-panel separately. The corresponding vibration is computed, and is utilized as excitation for an acoustic boundary element analysis. The acoustic response is computed at any data recovery point of interest. The relationships between the acoustic response and the pressure excitation applied at each particular sub-panel constitute a set of transfer functions. They are combined with the spectral densities of the excitation for computing the noise generated from the vibration of the panel subjected to the boundary layer excitation. The development presented in this paper has the potential of computing wind noise in automotive applications, or boundary layer noise in aircraft applications.

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