International Journal of Applied Electromagnetics and Mechanics - Volume 45, issue 1-4

Authors: Yuan, Zhensheng | Li, Weixin | Pei, Cuixiang | Wu, Wenjing | Chen, Zhenmao

Article Type: Research Article

Abstract: In this paper, a numerical method is proposed for simulating dynamic response of a ferromagnetic structure immersed in a strong magnetic field aiming at applications to the in vessel Tokamak structure of RAFM steel. The magnetic damping coupling effect and the magnetic stiffness coupling effect are considered in the numerical simulation. For simple, the static magnetic field is supposed very strong and the material is considered saturated in this work, i.e., the material is of air …permeability but with a strong residual magnetization. To demonstrate the validity of the numerical method, the dynamic response of a ferromagnetic plate immersed in a transient transverse magnetic field with in-plane magnetic field component is simulated with the developed numerical code and compared with the simulated results with ANSYS. The good consistency of numerical results and simulation results demonstrated the validity of the proposed method and the corresponding numerical code. Show more

Keywords: Ferromagnetic material, coupling effect, transient response, numerical method

DOI: 10.3233/JAE-141855

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 387-394, 2014

Authors: Xie, Shilin | Li, Peichao | Zhang, Xinong | Yan, Bo

Article Type: Research Article

Abstract: The electromagnetic shunt damping absorber (EMSDA) is developed based on electromagnetic shunt damping mechanism. The governing equation of planar vibration system equipped with the EMSDA is derived. An optimization method is presented to determine the main working parameters of EMSDA on the basis of the built theoretical model. The objective function minimizing the response variance of system under white noise excitation is formulated. The particle swarm optimization algorithm is employed in optimization. The …simulated and experimental studies on vibration control by use of EMSDA are conducted. The results show that the electromagnetic shunt damping absorber can attenuate significantly the structural vibration. Show more

Keywords: Electromagnetic shunt damping, absorber, vibration control, optimization, particle swarm optimization algorithm

DOI: 10.3233/JAE-141856

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 395-402, 2014

Authors: Ido, Yasushi | Hayashi, Koichi | Ueno, Satoshi | Todaka, Takashi

Article Type: Research Article

Abstract: Viscous, magnetization and damping properties of magnetic compound fluids containing fibrous material such as alpha-cellulose were investigated experimentally. It is shown that adding fibrous material to magnetic functional fluids is effective on increasing viscosity on the fluid while the amplification ratio of damping force in the presence of magnetic field against damping force in the absence of magnetic field decrease with increase of volume fraction of the fibrous material.

Keywords: Magnetic compound fluid, magnetic fluid, fibrous material, damping force, viscosity, magnetization, alpha-cellulose

DOI: 10.3233/JAE-141857

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 403-408, 2014

Authors: Zhao, Jianhua | Man, Xingbo | Xue, Xiaomin | Sun, Qing | Zhang, Ling

Article Type: Research Article

Abstract: The recently developed macro fiber composite (MFC) actuators are widely used in a variety application due to their high performance, flexibility and durability when compared with the prior actuators. This paper aims to model and compute the effective electromechanical properties of MFC actuators using the finite element method (FEM) and verify the accuracy the model through the experimental test. The results indicate that the FEM results are in good agreement with the experimental data. It demonstrates …that the finite element (FE) model is effective to predict the electro-elastic properties of MFC when the electric field is applied. Show more

Keywords: Macro fiber composite (MFC), electromechanical properties, finite element method (FEM), peak-to-peak voltage (PPV)

DOI: 10.3233/JAE-141858

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 409-415, 2014

Authors: Li, Yong | Liu, Xiangbiao | Chen, Zhenmao | Zhao, Hongda | Cai, Wenlu

Article Type: Research Article

Abstract: Multilayered Tubular Structures (MTS) such as pipeline are widely employed in such industrial fields as nuclear energy, petroleum, etc. It is vital to non-destructively evaluate MTS periodically before catastrophic accidents take place. As one of the advanced Electromagnetic Nondestructive Evaluation (ENDE) techniques, Pulsed Eddy Current Testing (PECT) has been found advantageous over the other ENDE methods regarding evaluation of integrity of MTS. In this paper, a fast forward model of PECT inspection of MTS is proposed …based on the analytical modeling, namely the Extended Truncated Region Eigenfunction Expansion (ETREE). The closed-form expressions of PECT signals of 3D magnetic field and coil Electromotive Force (EMF) have been formulated. The proposed model has been verified by Finite Element Modeling (FEM) and experiments. The advantages of the model in terms of high computational speed and accuracy have been identified. Show more

Keywords: Electromagnetic nondestructive evaluation, pulsed eddy current testing, analytical modeling, multilayered tubular structures, finite element modeling

DOI: 10.3233/JAE-141859

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 417-423, 2014

Authors: Li, Min | Lowther, David | Guimar\~{a}es, Frederico

Article Type: Research Article

Abstract: Fast and accurate crack detection techniques are required for the eddy current non destructive testing, especially in the case where a large amount of environmental noise exists. This paper presents a robust inverse solution for accurate shape reconstruction of natural cracks. A robust formulation is employed to deal with the uncertainties caused by the noise in the eddy current testing signals. The proposed method is capable of producing more robust results than the conventional formulation in …terms of the statistical analysis of the reconstruction tests. Show more

Keywords: Non-destructive testing, robustness, topological sensitivity analysis

DOI: 10.3233/JAE-141860

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 425-430, 2014

Authors: Xiao, Ling | Sun, Yanhua | Ding, Chunhua | Yang, Lihua | Cheng, Wenjie | Yu, Lie

Article Type: Research Article

Abstract: To calculate the complex permeability of soft magnetic composites, two-dimensional analytical models with and without the defects were used for the complex case. The relation of the complex permeability with the frequency, component size ratio δ and inclusion particle size is deduced. The results show that the effect of the defects is even more pronounced for the complex permeability. The complex permeability is a function of the component size ratio δ and the size of the …inclusion. Increasing the component size ratio δ causes a decrease of the complex permeability at the same frequency. With the increase of inclusion particle size when the component size ratio keeps constant 0.01, both of the real and imaginary parts increase. In addition, the theoretical method is tested by the experimental results, which can be used to design parameters before the experiment. Show more

Keywords: Complex permeability, defect rate, soft magnetic composites

DOI: 10.3233/JAE-141861

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 431-439, 2014

Authors: Wang, Hao | Shang, Jing | Li, Yong | Xu, Yongxiang

Article Type: Research Article

Abstract: Electrical error which contains amplitude error, function error and zero error has a direct impact on accuracy of resolver when resolver is used as a angle measuring device in control system. Harmonic interference existing in the output electromotive force (EMF) of signal windings is the main influencing factor of function error. Therefore, the reduction of harmonic interference will greatly weaken function error. In this paper, an axial flux variable-reluctance (AFVR) resolver with short pitch distributed winding …is put forward on the basis of former variable-reluctance resolver. By the analyses of finite element method (FEM), high order harmonic of output EMF makes the distortion of EMF waveform and causes errors. Furthermore, the change regulation of high harmonics in the output EMF is got. The optimization analysis is done to rotor shape, pole-pairs and each group teeth number of this new resolver. Through FEM analysis and discussion on the optimized AFVR resolver, the analytic results show that the influence of harmonic interference is seriously weakened, and measurement accuracy is upgraded. Show more

Keywords: Electromotive force (EMF), finite element method (FEM), high order harmonic, function error

DOI: 10.3233/JAE-141862

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 441-447, 2014

Authors: Yonemori, Hironobu | Fujiwara, Akihiro | Maruyama, Ryo | Kobayashi, Miki

Article Type: Research Article

Abstract: This paper discusses high frequency acoustic noise generated by an IH cooker. Mechanism of the high frequency acoustic noise generation is clarified by experimental study. Recently, influence of the electromagnetic wave on the human body is worried. They symptoms some users of home electronic appliances feel are headache and nausea. There is a report that other users who are using IH cooking heater also feel these symptoms. We have discovered that the high frequency acoustic noise, …which is generated from an IH cooker, indicates strong-level sound pressure. High frequency strong acoustic noise must not be ignored, because its danger on our health is reported scientifically and medical standpoints. Then, it becomes necessary to examine the suppressing method of high frequency acoustic noise. In this paper, generating mechanism of the high frequency (20 kHz ∼) acoustic noise is clarified by the experiments. Show more

Keywords: IH cooker, high frequency acoustic noise, vibration

DOI: 10.3233/JAE-141863

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 449-456, 2014

Authors: Novo, L.R.G.S.L. | De Melo, M.T. | De Oliveira, M.R.T. | Bezerra, J.M.B. | De Medeiros, L.H.A. | Aquino, R.R.B.

Article Type: Research Article

Abstract: Companies of power transmission lines and telecommunications need to know the condition of their structures. However, there are ones which are buried or encased in concrete below-ground. Nondestructive techniques are essentials to investigate the condition of the rods used to anchor guy cables in guyed towers. A connector and a matching circuit have been designed to allow a network analyzer to apply and receive high frequency signals on these rods and, furthermore, to be able to …identify corrosion or holes on an anchor rod using a promising nondestructive technique. High frequency analysis have been done on the results provided by simulations and experimental tests through the reflected signals that come in the input port of the connector and matching circuit. The high frequency connector, named CHAAF, was fabricated and tested. Show more

Keywords: High frequency connector, anchor rods, network analyzer

DOI: 10.3233/JAE-141864

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 457-464, 2014