International Journal of Applied Electromagnetics and Mechanics - Volume 52, issue 1-2

Authors: Yashima, Kenji | Takagi, Toshiyuki | Kosukegawa, Hiroyuki | Izumi, Shin-Ichi | Nagatomi, Ryoichi | Mori, Hitoshi | Abe, Toshihiko

Article Type: Research Article

Abstract: The design and development of coils for paired associative magnetic stimulation are described. The paired associative stimulation technique provides synchronous magnetic stimulation to the brain and peripheral nerves. Because heat is generated in the coil, it is necessary to attain a stronger magnetic field strengths at low discharge voltages. In this study, numerical analyses of coils used to stimulate peripheral nerves are performed to ensure coils can be used continuously and safely without overheating.

Keywords: Magnetic stimulation, peripheral nerve, cored coil, numerical analysis, paired associative stimulation

DOI: 10.3233/JAE-162138

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 503-509, 2016

Authors: Tang, Dalai | Yoshihara, Yuri | Takeda, Takahiro | Botzheim, János | Kubota, Naoyuki

Article Type: Research Article

Abstract: Recently, various types of wireless sensor network systems have been developed. Their price has also been reduced, and we can easily use such systems to monitor human states and behaviors in a house. Furthermore, such kind of information is useful for elderly care and nursing care by robot partners. However, we have to integrate different types of data measured by each sensor node to estimate human states and behaviors. If the measurement data are organized and structured, the monitoring system can do flexible monitoring and share the information. Therefore, we have proposed the concept of Informationally Structured Space (ISS). This …paper proposes a methodology for human behavior estimation by wireless sensor networks in ISS. Next, we propose a monitoring system for sensor state and human behavior using ISS. Finally, we show several experimental results and discuss the effectiveness of the proposed method. Show more

Keywords: Informationally structured space, smart house, spiking neural network, monitoring

DOI: 10.3233/JAE-162069

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 511-516, 2016

Authors: Vanus, Jan | Machacek, Zdenek | Koziorek, Jiri | Walendziuk, Wojciech | Kolar, Vaclav | Jaron, Zdenek

Article Type: Research Article

Abstract: This paper focuses on the effective reducing of operating costs in the Smart Home Care system. The applied developed system components are designed for seniors auxiliary monitoring of the energy consumption. The paper describes the solution of information processing about quantity of the consumed electric and heat energy, gas and water consumption by using of the advanced system for consumption meters with recognition of video camera signal in the Smart Home Care monitoring system. The concept structure and principles of energy monitoring are designed with developed advanced electronic components, which are realized and verified for industry and commerce sphere.

Keywords: Smart Home Care, energy management, smart grids, energy consumption, image processing

DOI: 10.3233/JAE-162028

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 517-524, 2016

Authors: Zhu, Liangfan | Wu, Yue | Luo, Yun

Article Type: Research Article

Abstract: Left ventricular assist devices (LVADs) have been verified as an effective way for the patients who suffer from the end-stage heart failure. In order to prolong the lifespan of the LVAD, a blood pump with magnetically or hydrodynamically suspended impeller is preferred. Magnetic bearings need active control consuming extra energy and hydrodynamic bearings running at very small clearance gaps can yield increased blood damage. A novel blood pump with a passively injection suspended impeller and a gap between casing and impeller in the large range of 0.6 mm is presented in this paper. This design allows the blood pump to …eliminate the sensors for active control and operate at low levels of shearing stress. The computational fluid dynamics (CFD) analysis was conducted to primary verify the effectiveness of injection principle. The hydraulic performance and axial levitation performance test were performed to prove feasibility of the design. Show more

Keywords: Left ventricular assist device, injection suspended impeller, hydrodynamic force

DOI: 10.3233/JAE-162159

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 525-530, 2016

Authors: Zhao, Ruzhen | Yao, Yao | Luo, Yun

Article Type: Research Article

Abstract: Flexible endoscopes have been widely used for diagnostic and therapeutic interventions in minimally invasive surgeries. The flexible property provides flexible endoscopes the unique ability to reach cavities and viscera. However, in natural orifice transluminal endoscopic surgery (NOTES), during advancing process, a flexible endoscope without shape control is unstable and could lead to cavity buckling. When the end of the endoscope reaches the target, the endoscope should be rigid enough to hold its shape against external forces for better surgery operations. To overcome this problem, a novel variable stiffness over tube based on low melting point alloy (LMPA) was proposed in …this paper. It could provide a channel for endoscopic instruments to go through human cavity. The over tube exploits the phase transformation property of LMPA which enable the stiffness change of the over tube. Steel cables were used to control the shape of the over tube. A prototype was built and experiments were carried out to evaluate its shape control effectiveness, variable stiffness property and response characteristics. According to experimental results, it cost 14 s to make the over tube transform from rigid state to flexible state and 15 s to make the over tube transform from flexible state to rigid state. Experimental results also indicated that the over tube is very rigid in rigid state and flexible in compliant state. Show more

Keywords: Endoscopic surgery, flexible, low melting point ally, variable stiffness, compliant mechanism

DOI: 10.3233/JAE-162210

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 531-539, 2016

Authors: Tejima, Shogo | Ito, Shumpei | Mifune, Takeshi | Matsuo, Tetsuji | Nakai, Tomoo

Article Type: Research Article

Abstract: The assembled domain structure model (ADSM) is applied to an analysis of thin film magneto impedance (MI) element. The ADSM is a multiscale magnetization model constructed by the assembly of mesoscopic particles called the simplified domain structure models. The ADSM successfully reconstructs the characteristics of the thin film MI element where three stable magnetic domain states coexist. The simulation reveals the influence of longitudinal distribution of magnetic field on the magnetization property that is hardly affected by the perpendicular magnetic field.

Keywords: Magnetic domain, magneto impedance element, multiscale-model

DOI: 10.3233/JAE-162049

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 541-546, 2016

Authors: Guérin, Christophe | Leconte, Vincent | Dular, Patrick | Geuzaine, Christophe | Mazauric, Vincent

Article Type: Research Article

Abstract: This paper deals with the use of a vector Jiles-Atherton hysteresis static model introduced in the solving of a 2D time-domain finite element calculation. To ensure convergence, a Newton-Raphson algorithm is used with a relaxation procedure. The model is applied to simulate the transient operation of a fast-acting electromechanical actuator, accounting for remanence in the ferromagnetic parts. The impact of static hysteresis and eddy currents is investigated.

Keywords: Magnetic hysteresis, finite element method, electromechanical actuator

DOI: 10.3233/JAE-162078

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 547-554, 2016

Authors: Takayama, Teruou | Kamitani, Atsushi

Article Type: Research Article

Abstract: The high-speed method is proposed for analyzing a shielding current density in a high-temperature superconducting film containing cracks. In the proposed method, the linear-system at each iteration of Newton method is solved by using a GMRES(k) method. Consequently, it is found that the GMRES(k) method is a powerful tool for analyzing the shielding current density in an HTS thin film. In addition, the speed of the GMRES(k) method can be accelerated by a factor of about 2 by using the H-matrix method.

Keywords: GMRES(k) method, H-matrix method, high-temperature superconductor

DOI: 10.3233/JAE-162031

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 555-561, 2016

Authors: Morimoto, Eiki | Niguchi, Noboru | Hirata, Katsuhiro

Article Type: Research Article

Abstract: This paper evaluates a permanent magnet variable flux motor that uses centrifugal forces to change its torque constant. As the rotation speed increases, the displacement angle between the separate rotors also automatically increases. The effectiveness of the motor is verified by 3-D finite element analysis and measurements on a prototype. These results show a good agreement with each other. From these, it is verified that the motor can change the characteristics automatically.

Keywords: Variable flux, permanent magnet motor, centrifugal force, finite element analysis, experiment verification

DOI: 10.3233/JAE-162065

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 563-569, 2016

Authors: Sakai, Masahiko | Hirata, Katsuhiro | Nakata, Yoshihiro

Article Type: Research Article

Abstract: This paper presents a helical teethed linear actuator (HTLA) for artificial muscles of human coexistence robots. The HTLA has small number of simple-shaped permanent magnets and coils. The advantages of this actuator are a high force constant and capability of accurate assembly. The performances of the HTLA were investigated by using 3-D finite element method (FEM). As a result, it was found that the maximum thrust force was 23.1 N, and the efficacy of the PID position control for the HTLA was confirmed. In addition, by the force control using encoder signals, the detent force was decreased to 0.56 N …and the force constant was 34.9 N/A. Moreover, the control of the stiffness for flexible motions was implemented by using compliance control. Show more

Keywords: Electromagnetic linear actuator, artificial muscle, helical teeth, force control, 3-D finite element method

DOI: 10.3233/JAE-162048

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 571-578, 2016