International Journal of Applied Electromagnetics and Mechanics - Volume Pre-press, issue Pre-press

Authors: Huang, Haiyang | Wang, Cheng | Lai, Xiongming | Chen, Jianwei

Article Type: Research Article

Abstract: In order to select the window function and window size adaptively before getting the results, we proposed adaptive moving window principle component analysis (AMWPCA) based OMA method to identify modal shapes and modal natural frequencies of slow LTV structures with weekly damped only from non-stationary vibration response signal online. The adaptive is achieved in two ways: change the window function or window size. We develop an adaptive indicator as the basis for window function and window size changes Our adaptive approach is to make the difference between adjacent eigenvalues not too small. The operational modal parameter identification results in non-stationarity …response signal dataset of a three-degree-of-freedom structure with slow time-varying mass show that comparing with fixed size moving window principle component analysis, our AMWPCA method can identify the modal shapes and modal frequencies better. Show more

Keywords: Moving window, adaptive, window function, linear time-varying structure, operational modal analysis, principle component analysis

DOI: 10.3233/JAE-209359

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Chen, Dezhi | Diao, Chengwu | Feng, Zhiyu | Zhang, Shichong | Zhao, Wenliang

Article Type: Research Article

Abstract: This paper presents the performance of vector modulation technology in the open-winding permanent magnet synchronous motor (OW-PMSM) considering the unity power factor control. And a topology structure is proposed to optimize the fault tolerance of inverter. Matlab software and Maxwell software collaborative simulation are supplied to obtain the reactive power, speed, terminal voltage, electromagnetic torque etc. under normal and fault status. Finally, the simulation results of an open-winding permanent magnet synchronous motor are verified by the experimental results.

Keywords: Open-winding permanent magnet synchronous motor, fault tolerance, unity power factor control

DOI: 10.3233/JAE-209448

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Okobira, Tatsuya | Nguyen, Dang-Trang | Taguchi, Kozo

Article Type: Research Article

Abstract: Many efforts have been devoted to the improvement of metal-air batteries. Aluminum (Al) is the most abundant metal in the Earth’s crust and has high electrochemical potential. Therefore, the aluminum-air battery is one of the most attractive metal-air batteries. To overcome some disadvantages of the aluminum-air battery, some alloys of aluminum and several metals have been proposed. In this study, the performance improvement of the aluminum-air battery by doping zinc (Zn) to the aluminum anode was investigated. Zinc was doped to aluminum by a simple process. The difference in the characteristics of Zn-doped Al due to different heating temperature during …the doping process was also investigated. The maximum power density of the battery was 2.5 mW/cm2 . Show more

Keywords: Aluminum-air battery, dope, zinc, simple method, ozone treatment

DOI: 10.3233/JAE-209307

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Nagai, Hiroshi | Okuyama, Takeshi | Tanaka, Mami

Article Type: Research Article

Abstract: In this paper, an active tactile sensor system for measurement of Young’s modulus and viscosity is developed. For the active sensing, the sensor unit with the 8 bimorph piezoelectric array is bonded to the speaker that is driven by a square wave. The transient response from the sensor signal of each bimorph piezo cell is processed to reduce the noise. From the output, the first peak and the ratio of first peak to time of first peak are extracted as the indexes for the measurement of Young’s modulus and viscosity, respectively. It is confirmed that the first peak has a …clear correlation with the Young’s modulus, and that the ratio of first peak to time of first peak has a definite correlation with the viscosity. Further, the initial contact force affects the sensitivities of Young’s modulus and viscosity. Show more

Keywords: Tactile sensor, piezoelectric bimorph array, active sensing, measurement of Young’s modulus and viscosity

DOI: 10.3233/JAE-209426

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Yan, Gang | Zheng, Yifei

Article Type: Research Article

Abstract: This paper proposes a new printed electrical impedance tomography (EIT) sensor for detection of damage in composite structure. The EIT sensor consists of a sensing area and related electrical circuits. It is directly printed on the surface of composite structure by a layer-by-layer screen printing process with graphene-doped carbon ink and silver ink. By injecting tiny currents into the EIT sensor and measuring the corresponding boundary voltages, damage information can be obtained by inverse analysis to reconstruct the distribution of conductivity change caused by damage. It has the potential to quantitatively identify the locations and sizes of multiple damage without …any prior knowledge. Experimental results on a glass fiber reinforced polymer (GFRP) plate with different number of simulated damage have demonstrated the effectiveness of the printed sensor itself and the related damage detection method. Show more

Keywords: Composite structure, damage detection, printed sensor, electrical impedance tomography, inverse analysis

DOI: 10.3233/JAE-209416

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Wang, Xiang | Wang, Xiaoyu | Chai, Hongyou | Gao, Feng | Wang, Haowei | Ji, Hongli | Qiu, Jinhao

Article Type: Research Article

Abstract: In order to suppress the vibration of large-scale flexible structures which are applied on the spacecraft, a semi-active control method based on fuzzy adaptive SSDV (synchronized switch damping on voltage) technique is proposed. The value of voltage source at the switching moment is adjusted adaptively by using fuzzy logic, in order to improve the stability and control precision of the semi-active control system. The feasibility of this method is verified by two kinds of experiments with typical disturbance conditions. By comparing different adaptive displacement-voltage curves, the fuzzy adaptive method can achieve higher control precision. For the initial displacement disturbance of …10 mm, the fuzzy adaptive SSDV method can increase the system damping ratio from 0.6% to 5.1%. The control effect decreases with the increase of initial displacement. For the disturbance caused by the mechanism at the tip position, the method can effectively shorten the vibration damping time and reduce the displacement from 0.3 mm to 0.04 mm. Show more

Keywords: Large-scale flexible structure, semi-active control, synchronized switch damping technique, fuzzy logic

DOI: 10.3233/JAE-209437

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Otani, Shu | Nguyen, Dang-Trang | Taguchi, Kozo

Article Type: Research Article

Abstract: In this study, a portable and disposable paper-based microbial fuel cell (MFC) was fabricated. The MFC was powered by Rhodopseudomonas palustris bacteria (R. palustris ). An activated carbon sheet-based anode pre-loaded organic matter (starch) and R. palustris was used. By using starch in the anode, R. palustris -loaded on the anode could be preserved for a long time in dry conditions. The MFC could generate electricity on-demand activated by adding water to the anode. The activated carbon sheet anode was treated by UV-ozone treatment to remove impurities and to improve its hydrophilicity before being loaded with R. palustris . The developed …MFC could generate the maximum power density of 0.9 μW/cm2 and could be preserved for long-term usage with little performance degradation (10% after four weeks). Show more

Keywords: Paper-based MFC, Rhodopseudomonas palustris , UV-ozone cleaning, biofilm, bio-anode

DOI: 10.3233/JAE-209444

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Dong, Ting | Dong, Xingkang | Wei, Xuepeng

Article Type: Research Article

Abstract: Thrust performance is one of the important indexes of permanent magnet linear synchronous motors. The traditional non-oriented silicon steel sheet is used as the core material of the permanent magnet linear synchronous motor, which limits the performance of the permanent magnet linear synchronous motors. For the oriented silicon steel sheet has a higher magnetic permeability in the rolling direction, a permanent magnet linear synchronous motor with similar number of pole and slot made of oriented silicon steel is proposed in this paper. By measuring the B -H curves of the rolling direction and the cutting direction, the thrust properties …of the two motors made of traditional silicon steel sheets and oriented silicon steel sheets are analyzed and compared by the finite element method (FEM) under rated load and overload conditions respectively. The thrusts under different tooth-yoke ratio are discussed in the end. Show more

Keywords: Thrust, oriented silicon steel, PMLSMs, similar number of poles and slots

DOI: 10.3233/JAE-209472

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Chen, Dezhi | Zhang, Yuyong | Yao, Hang | Wang, Yang | Zhao, Wenliang

Article Type: Research Article

Abstract: In this paper, the magnetic field and temperature field of transformer are analyzed, and the influence of temperature on electrical steel sheet is considered. Experiment are supplied to obtain the magnetic properties curves (B-H curves, B-P curves, and magnetic permeability curves of 30QG120), which are required for the accurate FEM (finite element method) simulation setup. Finally, the magnetizing characteristics and temperature distribution of the transformer under different temperatures and loads are studied experimentally. The simulation results of a singlephase transformer are verified by the experimental results.

Keywords: Electrical steel sheet, different temperature magnetizing characteristics, transformer, simulation and experiment

DOI: 10.3233/JAE-209388

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Wimmer, Georg | Lange, Sebastian

Article Type: Research Article

Abstract: The formulation for the azimuthal component of the magnetic vector potential for axisymmetric magnetostatic applications is well known. However for transient magnetic fields with solid source conductors and eddy currents the formulation has to be revised. A variable transformation is introduced to remove the singularity from the numerical scheme. The numerical error cannot accumulate and is put instead to the postprocessing at every time step.

Keywords: Transient magnetic, finite element method, numerical error

DOI: 10.3233/JAE-209475

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020