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Finite element analysis was performed on the representative volume element of piezoelectric elements with interdigitated electrodes (IDEs). The variations of piezoelectric material properties during poling were considered in the analysis. The numerical results of models with different piezoelectric polarization states were compared with the result given by the so called uniform field model. Though...
In this paper, a resonant coupling wireless power transmission system whose resonator using single-layer helical coils is designed. Based on analysis of equivalent circuit, the efficiency and optimal transmission distance are obtained, and its correctness is verified by experiment. The resonant frequency and electromagnetic field distribution of system are obtained through high frequency finite element...
Contactless electrical energy transmission system (CEET) which can work under atrocious conditions realizes contactless transmission between power and loads. It is necessary to improve the efficiency of the detachable transformer, as it plays an important role in the system. Based on the structure and work principle of the system, related parameters are analyzed in this paper. Detachable transformer...
Contact-less electrical energy transmission system (CEET) becomes more and more attractive for various applications. A coreless detachable transformer used for CEET is investigated in this paper. Equivalent circuit model of detachable transformer was established and analyzed. And the flux distribution of the proposed detachable transformer was attained using finite element method (FEM). The flux simulation...
Contact-less electrical energy transmission system has become more and more attractive in power transmission area these years because there is no direct electrical connection or physical contact between the energy transmission system and the power receiver. This paper presents the function principle of contact-less electrical energy transmission systems and new developments. Equivalent circuit model...
In this paper, the finite element analysis of a recently developed electromagnetic acoustic emission (EMAE) which can be used for damage assessment of thin walled conducting structures has been reported. Due to the local high-intensity stress field generated by the electro-magnetically induced high-density current pulse, EMAE can locate small flaws or cracks in thin-walled structures non-destructively...
A magnetostrictive force sensor was presented, which was based on the piezomagnetic effect. Relation between magnetic flux density in the gap and applied stress on the magnetostrictive force sensor was computed by the finite element method and measured. It is found that the computed result trendency is similar with the measured one. It has been proved that the giant magnetostrictive material is suitable...
This paper presents a magneto-mechanical strong coupled model for giant magnetostrictive force sensor. According to the model and the measured magnetic characteristic of giant magnetostrictive material, the input-output relation for the force sensor is calculated by means of the finite element method. A comparison between the calculated result and measured one is carried out and it is found that they...
Transcranial magnetic stimulation (TMS) is a powerful, noninvasive tool for investigating functions in the brain. The target inside the head is stimulated with eddy currents induced in the tissue by the time-varying magnetic field. In this paper, a realistic head model used in FEM has been developed. The magnetic field induced in the head by TMS has been analyzed. The results are useful for the optimization...
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