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

Authors: Ando, Yoshinori | Baba, Akira | Onuma, Takuya | Murakami, Iwanori | Yamada, Kou

Article Type: Research Article

Abstract: A magnetic gear can transmit a torque and a motion without the contact by the magnetic force. Today a magnetic gear are studied about increasing transmit torque and decreasing cogging torque. The property of the positioning is another significant property in use of a motion transmission by magnetic gears. Therefore it is important to measure the positioning property. The purpose of this research is to check the relationship between the number of the magnet of the …gear and positioning property. Then we have developed three types of gear which have a different number of teeth severally. By using the developed three types of gear, the average and the standard deviation are calculated from experimental results. We reveal the influence of the number of the teeth to positioning property in several operation conditions. Show more

Keywords: Magnetic gear, positioning accuracy, number of teeth, magnetic flux leakage

DOI: 10.3233/JAE-141815

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 75-82, 2014

Authors: Zhang, Chunlin | Zhang, Xinong | Xu, Minglong | Luo, Yajun

Article Type: Research Article

Abstract: This paper deals with the vibration control of a cantilever honeycomb sandwich plate by using Macro-Fiber Composite (MFC) piezoelectric actuator. Firstly, the honeycomb plate is equivalent to an orthogonal anisotropic plate. Secondly driving force and bending moment formulas of MFC actuator are derived based on the constitutive relations of the piezoelectric material, the equivalent parameters and bend deformation theory. The result reveals that driving force and bending moment not only depend on the driving …voltage and piezoelectric strain constants (d33), but also have relationship with the elastic modulus of honeycomb plate. To simulate the vibration of cantilever honeycomb plate structure, the governing equation of the plate bonded with MFC actuators is derived. Finally, the vibration by proportional derivative (PD) control of system with MFC actuator is simulated. The results show that better control performance is obtained by using MFC actuator when system under impulse excitation and steady state sine excitation. The vibration amplitude is diminished over 75% under PD control. Show more

Keywords: MFC piezoelectric actuator, honeycomb plate, active vibration control

DOI: 10.3233/JAE-141816

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 83-91, 2014

Authors: Yan, Bo | Zhang, Xinong | Luo, Yajun

Article Type: Research Article

Abstract: In this study, vibration isolation of a plate is investigated by using an electromagnetic shunt damping vibration isolator. The isolator consists of a box-shaped spring, a permanent magnet, an electromagnet, and a shunt circuit. The two ends of the electromagnet connect the negative resistance shunt impedance to constitute a circuit. In principle, the negative resistance shunt impedance could improve the damping force by canceling the inherent resistance of the electromagnet. The governing equation of the plate …is established according to Hamilton's principle and Galerkin's method. The numerical simulation is conducted and the result demonstrates that the isolator with the negative resistance shunt circuit is able to dampen the vibration of the plate. What's more, an interesting phenomenon is that the negative resistance shunt influences the natural frequencies of the coupling system. Show more

Keywords: Shunt damping, negative resistance, vibration control

DOI: 10.3233/JAE-141817

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 93-100, 2014

Authors: Tsukiji, Tetsuhiro | Miyahara, Kohei

Article Type: Research Article

Abstract: This paper presents small pumps to transport liquid crystal, herein called a liquid crystal pump. The mechanism of liquid crystalline flow by applying an electric field to the liquid crystal is used to generate one-directional flow in a pump. In this study, the pressure-flow rate characteristics of the pump were measured and the relationships between the non-dimensional flow rate and pressure of the pump were obtained. In addition the silicone oil is also used to compare …the flow phenomenon with the liquid crystalline flow under application of the electric field. The structure of a liquid crystal pump is simple and the size can be decreased by further research. So our pump has a good possibility for use in cooling system because it makes no noise and no mechanical vibrations. Show more

Keywords: Actuator, pump, flow visualization, liquid crystal, silicone oil

DOI: 10.3233/JAE-141818

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 101-107, 2014

Authors: Pei, Cuixiang | Wu, Wenjiang | Uesaka, Mitsuru | Demachi, Kazuyuki | Fukuchi, Tetsuo | Hirai, Shunsuke

Article Type: Research Article

Abstract: In this work, a non-contact ultrasonic method based on laser generation and EMAT (electromagnetic acoustic transducer) detection is proposed for residual stress measurement. A numerical method based on finite element model is established to simulate the laser-generated ultrasound in pre-stressed media to determine the capability and sensitivity of this method. Finally, the laser-EMAT ultrasonic method isstudied to measure the residual stress in bearing balls to assess the fatigue level of the bearings.

Keywords: Residual stress, laser ultrasound, numerical simulation, EMAT

DOI: 10.3233/JAE-141819

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 109-114, 2014

Authors: Rhyu, Se-Hyun

Article Type: Research Article

Abstract: This paper presents the dynamic characteristic analysis of a small sized permanentmagnet (PM) type stepping motor with newly structured claw-poles. First, the motor parameter is derived by PM analyzing torque and back-EMF using the 3-D finite element analysis (FEA) taking account magnetization of PM. Next, the dynamic characteristic of a small sized motor is calculated by magnetic circuit equation coupled with 3-D FEA. Specially, we propose a test method of step response for a small sized …PM type stepping motor using a position sensitive detection (PSD) sensor. From the simulation and test results, it is shown that the proposed dynamic characteristic analysis method has usability for a very small sized motors. Show more

Keywords: PM type stepping motor, PSD sensor, dynamic characteristics

DOI: 10.3233/JAE-141820

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 115-122, 2014

Authors: Zeroukhi, Youcef | Vega, Guillaume | Juszczak, Ewa Napieralska | Morganti, Fabrice | Komeza, Krzysztof

Article Type: Research Article

Abstract: In this paper we propose a new method using finite elements modelling to predict the impact of stranding and compacting process on a conductor electrical resistance. The experimental work has highlighted the complexity of physical phenomenon within the conductor caused by elastic and plastic deformations and inters-strands electrical contact resistance. In reality, electrical performance of a conductor depends on the nature of the material and its metallurgical state, on the mechanical pressure and electrical …conductance of inter-strands contact areas. For these reasons, mechanical models have been developed in Abacus software to study different parameters involved in the stranding and compacting process to determine the actual conductor shape, strands actual deformations, residual stresses and contact pressure, etc. The deformed geometries were exported to COMSOL Multi-physics software using ECAD IMPORT module. DC simulations were, then, performed to analyze the electrical resistance of the conductor. Finally, the results obtained by simulation have been compared to the measurements to determine the accuracy of the models. Show more

Keywords: Finite elements modeling, compacting, conductor 1+6, hardening, resistivity, DC resistance

DOI: 10.3233/JAE-141821

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 123-129, 2014

Authors: Tu, Jun | Kang, Yihua | Wu, Jianbo | Sun, Yanhua

Article Type: Research Article

Abstract: The problem of inability to calibrate due to uneven thickness in automatic ultrasonic testing used for the upset region of the drill pipe was studied. A water-immersion ultrasonic testing system was established to accomplish the inspection for this area and provide the defects information for post process. A real-time tracking method based on surface reconstruction was present to ensure all of the artificial defects to be accurately detected. An adjusting algorithm for the data was performed …to update the detecting results, so that the fitted curve was favorable for calibration. A sample pipe with through-holes was test with the system. The experimental results showed that all of the artificial defects could be detected after surface reconstruction and the adjusted data could provide the basis for the quantification of flaw, all of which had proved the data adjusting algorithm to be effective. Show more

Keywords: Water-immersion ultrasonic testing system, reconstruction, data adjusting algorithm, the upset region

DOI: 10.3233/JAE-141822

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 131-135, 2014

Authors: Wang, Cheng | Guan, Wei | Gou, Jin | Hou, Feng | Bai, Junqing | Yan, Guirong

Article Type: Research Article

Abstract: For free and random vibrations of weakly damped systems, a one-to-one relationship between vibration modal shapes of dynamic mechanical systems and linear compound matrix, and a one-to-one relationship between modal responses and principal components are demonstrated using the concept of modal coordinates. Based on this theoretical link, a novel time-domain structural system three-dimensional statistical operational modal analysis technique is proposed then. Numerical simulation processing results show that, the new PCA based method …is insensitive to Gauss measurement noise, and enables to identify main contribution modal shapes and eigenfrequencies from the displacement response-only in despite of system boundary, load type, and load position. Show more

Keywords: Operational modal analysis, principal component analysis, physical interpretation, three-dimensional, time-domain statistical modal parameter identification

DOI: 10.3233/JAE-141823

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 137-144, 2014

Authors: Zhang, Shuwen | Xu, Minglong | Jing, Zijian | Feng, Bo

Article Type: Research Article

Abstract: In this paper, a system for supplying electric power and signal transmission wirelessly for the hydrostatic loading device is put forward. The electric power supplying and signal sending module of the system adopt contactless transmission method, which is commonly called CPT (contactless power transmission). Energy, with the form of a certain frequency of magnetic field, gets through the austenitic stainless steel. Being used as the chamber of the system, the austenitic stainless steel has the same …relative magnetic permeability as the vacuum. After travelling through the chamber wall, energy is captured by the coil inside the chamber. Then it is converted into DC power and sent to the loads inside the chamber [1]. Signal processing and sending module converts the analog signals into digital ones and restore them. Data consisting of signals is sent out from the chamber with the form of magnetic wave. Devices outside the chamber receive the data and recover it. Show more

Keywords: CPT, electromagnetic wave, hysteresis, eddy current, spectrum analysis

DOI: 10.3233/JAE-141824

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 145-153, 2014