International Journal of Applied Electromagnetics and Mechanics - Volume 67, issue 1

Authors: Wang, Geng | Gao, Renjing | Wang, Qi | Liu, Shutian

Article Type: Research Article

Abstract: Electromagnetic linear actuators (ELAs) may be confronted with unsatisfactory performance when subjected to overheating. Therefore, it is significant to clarify its thermal characteristics and design the thermal performance requirements. A thermal analysis method based on multiphysics coupling model was presented, which uses the non-simplified loss distribution as the heat source to calculate the temperature field, adjusts the material properties by temperature, and considers the interaction between motion (including impact) and loss. More importantly, an improved universal equivalent winding to satisfy the condition of real compact concentrated winding was developed. Finally, the validity of this approach was verified through the experiment, …and the regularity of temperature was summarized. The results show that the error of simulation and experiment is less than 6% and the permissible continuous operation frequency is no more than 30 Hz. The approach proposed in this paper can be employed not only to the ELA, but also to the design and analysis a wide range of electromagnetic machines. Show more

Keywords: Electromagnetic linear actuator, equivalent winding, multiphysics coupling model, thermal analysis method

DOI: 10.3233/JAE-201586

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 67, no. 1, pp. 1-17, 2021

Authors: Wang, Jing | Song, Haicheng | Tomizawa, Takuma | Yusa, Noritaka | Ling, Yuanjin

Article Type: Research Article

Abstract: It is still a big challenge to calculate the probability of defect detection for inspecting pits on austenitic stainless steel welding using traditional POD models. Because we determine the decision threshold, the POD curve has a lot of changes as the decision threshold changes, there is no clear reason to insist which threshold is reasonable. This study proposes a new probability of detection (POD) model to quantitatively assess the detection capability of eddy current probes for inspecting pits on austenitic stainless steel welding. The experimental results show that the proposed model is more reasonable than traditional ones. The novel POD …model was employed to analyze three eddy current probes, uniform, TR, plus-point probes on austenitic stainless steel welding. The results reveal that the uniform eddy current probe has the best detection capability for inspecting pits on among the three probes. Show more

Keywords: Eddy current testing, probability of detection, stochastic decision threshold, austenitic stainless steel welding

DOI: 10.3233/JAE-201602

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 67, no. 1, pp. 19-33, 2021

Authors: Swiatkowski, Michal | Witczak, Pawel

Article Type: Research Article

Abstract: The aim of this paper is to present the impact of the leakage flux on magnetic shunts and tank walls of power transformers from vibrational point of view. The experimental studies of the large power transformers show that tank vibrations and the resulting acoustic emission at load condition are significantly higher than at no-load condition. The paper presents 3D finite elements model in electromagnetic domain used for the analysis of magnetic forces applied to shunts at rated short circuit state which are the origin of tank vibration. The main finding of the work is that forces equivalent to the magnetostriction …deformation of the shunt interior are comparable with magnetic forces resulting from the stray field and applied to the shunts’ surface. Show more

Keywords: Power transformer, magnetic shielding, magnetic flux leakage, magnetic and magnetostriction analysis

DOI: 10.3233/JAE-201622

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 67, no. 1, pp. 35-45, 2021

Authors: Eldabe, Nabil Tawfik | Moatimid, Galal M. | Abouzeid, Mohamed | Elshekhipy, Abdelhafeez A. | Abdallah, Naglaa Fawzy

Article Type: Research Article

Abstract: In the current paper, a semi-analytical solution is obtained for the problem of the peristaltic motion of Jeffrey nanofluid with heat transfer inside an asymmetric channel. The influences of variable viscosity, thermal conductivity, Hall currents, Joule heat and viscous dissipation are taken into consideration. The problem is modulated mathematically by a system of non-linear partial deferential equations which describe the fluid velocity, temperature and nanoparticles concentration distributions. This system is simplified by considering long wavelength of the peristaltic wave and low Reynolds number. It is solved by using the multi-step deferential transform method to obtain the velocity, temperature and nanoparticles …concentration distributions, pressure rise and pressure gradient. These solutions are obtained as functions of the physical parameters of the problem. Tables and figures are discussed to see the effects of these parameters. It is found that the thermal conductivity parameter causes an increase in the pressure gradient, meanwhile it reduces the pressure rise. Furthermore, it is noticed that the behavior of Brownian and thermophoresis parameters on nanoparticles concentration field are quite reverse. Show more

Keywords: Peristaltic flow, Jeffrey nanofluid, Hall currents, Joule heating, Mathematica 11

DOI: 10.3233/JAE-201626

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 67, no. 1, pp. 47-66, 2021

Authors: Yang, Xiaolong | Guan, Ying | Li, You | Gao, Shanghan

Article Type: Research Article

Abstract: In order to solve the problem of reciprocating seal for hydraulic cylinder, a new structure of Magnetorheological fluid (MRF) reciprocating seal with increasing width of pole teeth and pole piece was designed. The theoretical analysis of MRF reciprocating seal is carried out. The magnetic field intensity distribution in the sealing gap of MRF reciprocating seal was analyzed by finite element method. According to the pressure capability formula of MRF, the theoretical pressure capability is calculated. The influences of structure parameters such as the number of magnetic sources, sealing gap height, pole teeth length, the ratio of permanent magnet height to …its length, the ratio of pole piece height to shaft radius on the sealing capabilities were studied. The results showed that the pressure capability of MRF reciprocating seal increases with the increase of the number of magnetic sources and with the decrease of the sealing gap height. With the increase of the pole tooth length, the pressure capability of the reciprocating seal increases. With the increase of the ratio of permanent magnet height to its length, the pressure capability of the reciprocating seal increases first and then decreases. With the increase of the ratio of the pole piece height to shaft radius, the pressure capability of the MRF reciprocating seal increases first and then decreases. Show more

Keywords: MRF, reciprocating seal, key parameters, numerical analysis

DOI: 10.3233/JAE-201628

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 67, no. 1, pp. 67-82, 2021

Authors: Gao, Sumei | Ju, Quanyong | Jin, Chaowu

Article Type: Research Article

Abstract: In this paper, a kind of permanent magnet (PM) suspension active mass drive mechanism is proposed, and its structure is designed. It has the advantages of non-contact, almost zero friction, small volume, and so on. Aiming at the active driving mass mechanism of PM suspension, the unidirectional PM suspension system and bi-directional PM suspension system are designed respectively, and their analytical models are established. By analyzing and calculating the magnetic force of the unidirectional and bi-directional PM suspension system, the support coefficient of the suspension system is deduced. After theoretical analysis, the structure is simulated and verified by ANSYS MAXWELL …3D in order to determine the correctness of the analytical calculation of the model. Finally, a test device is made and experiments are carried out in the constant temperature laboratory. The experimental results show that the Nd-Fe-B PMs used in the unidirectional suspension system can provide a maximum force of 260 N, which verify the feasibility of the PM suspension active mass drive system. Show more

Keywords: Permanent magnet (PM), magnetic suspension, AMD, support characteristics

DOI: 10.3233/JAE-201631

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 67, no. 1, pp. 83-96, 2021

Authors: Nigam, Padmini | Muduli, Arjuna | Sharma, Sandeep | Pal, Amrindra

Article Type: Research Article

Abstract: In this letter, an efficient and electrically compact cavity-backed self-triplexing antenna using a substrate integrated waveguide (SIW) technique is proposed. The antenna model is nested with an inverted “T”-shaped cavity and convert the rectangular SIW cavity into the two quarter mode (QM) and a half mode cavity (HM) approximately; excited through a coax probe and two micro-strip feed line separately. The proposed model operates at three distinct frequencies at 9.37 GHz, 9.86 GHz, and 10.36 GHz used for X-band wireless and radar communication systems. The self-triplexing feature is obtained with the mode perturbation concept and adequate intrinsic isolation of >31 dB is observed …among three input ports. The proposed antenna possesses a minimum frequency ratio, uni-directional radiation patterns with high gain, and better efficiency. Show more

Keywords: Substrate integrated waveguide (SIW), isolation, self-triplexer, quarter-mode (QM), gain

DOI: 10.3233/JAE-201639

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 67, no. 1, pp. 97-112, 2021

Authors: Cheng, Yuhua | Kang, Wenyu | Wang, Gaofeng | Ghovanloo, Maysam | Li, Wenjun

Article Type: Research Article

Abstract: In the inductive wireless power transmission (WPT) designs of consumer electronics and implantable devices, the printed planar coil in standard manufacture is commonly used. Layout optimization of the coils is one of the important ways to make the power transmission system more efficient. Varying the trace width and turn-to-turn spacing together for the coils is proposed to optimize the maximum achievable power transfer efficiency (𝜂max ). An accurate analytical model for the printed square coils is also established as well to speed up the design process. By virtue of this model, an optimal scaling factor of the trace width and …the optimal frequency can be quickly estimated. The proposed model is validated by both the simulations (ANSYS HFSS) and experiments. A WPT link of two planar coils with size of 50 mm × 50 mm × 1 mm, operating at 23 MHz, is optimized by using this methodology. After optimization, the measured 𝜂max of the WPT system is increased from 22.60% to 32.74% at a 100-mm transmission distance. Show more

Keywords: Wireless power transmission, printed planar coil, layout optimization, analytical modelling

DOI: 10.3233/JAE-201641

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 67, no. 1, pp. 113-129, 2021