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

Authors: Chen, Wei | Wu, Guichu | Li, Yan | Ma, Jien

Article Type: Research Article

Abstract: This paper proposes a coupled finite element analysis of magnetic-thermal fields using an adaptive single-mesh method. To avoid errors from the data transfer and the mesh reconstruction due to different mesh requirements for the magnetic and thermal analysis, this proposed method built single mesh for both analyses. The results of the coupled parameters were transmitted through the single mesh between magnetic and thermal fields. According to the characteristics of the magnetic and the thermal distribution, the master-slave node method was employed to simplify the original element matrix into the magnetic and the thermal matrices, where slave nodes were no longer …solved in the solving process. Results of the slave nodes were expressed by their mater nodes using weight coefficients to regain the results of the original element matrix. A permanent magnet machine was introduced to validate the proposed method with both the commercial software and the experimental tests. Compared to the commercial software, the time cost was reduced by more than 8.0% when a higher accuracy of the thermal analysis was obtained. Show more

Keywords: Coupled analysis, finite element analysis, master-slave method, single mesh, thermal analysis

DOI: 10.3233/JAE-180093

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-14, 2019

Authors: Wang, Huimin | Wang, Tong | Zhang, Xuefeng | Guo, Liyan

Article Type: Research Article

Abstract: As the traditional flux-weakening control strategies have some limitations, such as poor parameter robustness, non-ideal dynamic performance in the constant power region and so on, a new control strategy based on the formula-based feedforward control and the voltage feedback control is proposed. In this strategy, the given reference values of the flux-weakening currents are first calculated by the simplified formulas used in feedforward control, improving the processing speed of the controller by reducing the computational complexity. Then the reference value of the d axis current is compensated by the fuzzy-PI feedback controller, avoiding operating point drifts caused by the …change or inaccurate of parameters in the actual. On this basis, a switching strategy is proposed to achieve a smooth switching between the constant torque and the constant power operation region. The experimental results show that the proposed control strategy has excellent performances, such as strong robustness to parameter perturbation, ideal dynamic performance in the flux-weakening region, smooth switching between the operation regions and so on. Show more

Keywords: Interior Permanent Magnet Synchronous Motor (IPMSM), flux-weakening, fuzzy-PI controller

DOI: 10.3233/JAE-190014

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-13, 2019

Authors: Yin, Rui | Shi, Yan | Di, Changan

Article Type: Research Article

Abstract: Aiming at the problems of complex structure and slow response of the existing hydraulic active suspension actuator, an electromagnetic linear actuator (EMLA) with simple structure, stable operation is designed in this paper. Based on completing the structural design of the EMLA, the two-dimensional finite element model is established by using the finite element software JMAG, and transient analysis of EMLA is carried out, including analyses of no-load magnetic field and thrust force characteristics. The prototype is trial-produced, and its thrust force characteristics are measured on a designed test bench. The experimental values are close to the simulated values, which verifies …the correctness of the model. Finally, by analyzing the variation of the electromagnetic thrust force under different loading currents, this paper obtains the thrust force constant of the EMLA (183N/A). Show more

Keywords: Electromagnetic linear actuator, JMAG finite element, prototype, thrust force characteristics

DOI: 10.3233/JAE-190070

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-12, 2019

Authors: Zhang, Haijun | Zhang, Hua | Ma, Qiang | Han, Haifeng | Wang, Shuhong

Article Type: Research Article

Abstract: Frequency Response Analysis (FRA) is an effective diagnosis approach to detect the winding mechanical faults in power transformer. For understanding the FRA signatures of transformer windings quantitatively, this paper uses the sensitivity method to study the characteristics of frequency response function (FRF) in equivalent circuit of transformer windings. The sensitivity expressions of FRF can be determined by adjoint network method and Tellegen theorem, which reflects the influence of electric parameter changes on FRA signature under winding faults and within a wide-frequency band (10 Hz to 2 MHz). To verify the sensitivity calculation, a two-winding transformer model with seven discs was established and …taken as an example. The results indicate that FRF sensitivity data can provide the valuable insights about how the frequency responses are affected quantitatively with respect to the electric parameter changes or different winding faults. The method and sensitivity analysis discussed in this paper may be useful for diagnosing and predicting different mechanical deformation faults of transformer windings. Show more

Keywords: Transformer winding, equivalent circuit, frequency response, sensitivity analysis

DOI: 10.3233/JAE-190038

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-11, 2019

Authors: Ding, Li | Zhang, Jiasheng | Lin, Aiguo

Article Type: Research Article

Abstract: In order to ensure the safety of fluid flow in deep-water submarine pipelines, a safe and energy-saving built-in skin effect electric heat tracing technology was adopted as the thermal management strategy. By analyzing the multi-physics conditions of the electromagnetic field-temperature field in the heating state of pipelines, the corresponding control equations were derived, and the physical model was established using the transient electromagnetic-temperature coupling field of Ansys Workbench. Simultaneously, we calculated the equivalent parameters of the oil pipeline and heating cable as the load when the system is heated to different temperatures. Thus, the main circuit parameters of the power …supply for the built-in skin effect electric tracing system were designed, thus providing the theoretical guidance for the key performance optimization. For regulating the output power of the built-in skin effect electric heat tracing system, the nonlinear active disturbance rejection control strategy was newly adopted to achieve closed-loop power regulation based on the Buck chopper, and the system has the advantages of fast dynamic response and strong anti-interference ability. Finally, the feasibility of the proposed control system was verified by simulation. Show more

Keywords: Built-in, electric heat tracing system, coupled field, finite element analysis, ADRC

DOI: 10.3233/JAE-190001

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-15, 2019

Authors: Kim, Hong-Kyo | Kang, Beom-Soo | Kim, Jeong

Article Type: Research Article

Abstract: An electromagnetic launcher or accelerator is a useful device for obtaining a wide range of payload velocities. Electromagnetic launchers have smaller space requirements compared to compressed air gas launchers and can use easily obtainable grid electricity to provide thrust in place of a conventional propellant. Despite these advantages, it is difficult to measure launcher muzzle velocity, as the flames and light produced by the muzzle during launch make velocity measurement using a light sensor or high-speed camera impossible. To overcome this problem, B-dot probes can be used to track the projectile position within the launcher by sensing changes in the …magnetic field, which generate an induced voltage in the probe following Faraday’s law. This paper proposes a B-dot probe based method for measuring an electromagnetic launcher’s muzzle velocity. After determining the sensing effect as the probe positions and orientations through numerical simulation, the B-dot probe was used to measure the muzzle velocity, which was compared to a muzzle velocity obtained using a high-speed camera to validate the proposed method. Show more

Keywords: Electromagnetic launching, voltage measurement, velocity measurement, numerical analysis

DOI: 10.3233/JAE-190040

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-18, 2019

Authors: Meng, Fanxu | Zhou, Jin

Article Type: Research Article

Abstract: In this paper, a novel mechanical model based on arc tangent function is established to accurately describe the hysteretic behavior of the squeeze mode Magnetorheological (MR) damper. An improved differential evolution (DE) algorithm, which can avoid the shortage of being easily trapped in a local extremum, is applied to identify the parameters of the model. The dynamical characteristic of the MR damper is experimentally investigated with the help of the MTS machine. The validity of the proposed model is confirmed from a good agreement between the simulations and measured data. In addition, comparative analysis of the simulations with two other …existing models, reveals that the proposed model has a relatively high modelling accuracy with less parameters and explicit physical meaning. Show more

Keywords: Magnetorheological damper, squeeze-mode, characteristic analysis, modeling, differential evolution algorithm

DOI: 10.3233/JAE-190008

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-13, 2019

Authors: Yu, Xudong | Xie, Yuanping | Xiong, Zhenyu | Liu, Chang

Article Type: Research Article

Abstract: A ring laser gyroscope is an optical sensor based on the Sagnac effect. It has many outstanding advantages, such as a short start-up time, a high precision, a wide dynamic range and a stable scale factor. It is insensitive to accelerations and is in wide use in aircraft attitude control, north finding applications including navigation and space missions. The path length transducer in a ring laser gyroscope is required to stabilize the optical path of the laser beams in the cavity. The path length control transducer may tilt in complex environment, which will cause deformation of resonant optical path in …resonant cavity and seriously influence the performance of ring laser gyroscope. Firstly, for the first time, finite element analysis software ANSYS was used to simulate and analyze the small deformation of ring laser gyroscope’s grooved mirror in three directions under typical random vibrational spectra, their value were 2.08" , 2.10" and 1.30" respectively, and the deformation in the diaphragm of resonant cavity was obtained by combining with matrix optical theory quantitatively. Secondly, the influence rule of different radius of curvature and isostructural parameters on the tilt of path length control transducer was sought through quantitative analysis. Finally, combining with the change law of axial displacement in literature [5 ], an evaluation criterion for optimization was given and the optimized parameters were listed for path length control transducer. The tilt was reduced to 0.33" after optimization, which was about 21.4% of current structure. The axial displacement reached 3.89 um, which was 1.84 times of existing structure. The research in the paper could provide reference for the design of path length control transducer of ring laser gyroscope. Show more

Keywords: Ring laser gyroscope, path length control transducer, vibration, finite element analysis

DOI: 10.3233/JAE-190030

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-11, 2019

Authors: Marcsa, Dániel | Veress, Árpád | Szegletes, János | Oroszváry, László | Molnár, László

Article Type: Research Article

Abstract: Passive wheel speed sensors are widely used in automotive applications where knowledge of the rotational velocity of the rotating axes and resistant to environmental impacts are required. This paper presents a general introduction to wheel speed sensor systems and the underlying physical behaviour are explained with the help of three-dimensional time-stepping finite element method. The 3D field simulations well reflect the dynamics of the magnetic field of the real problem and they provide a quantitative understanding of the output signal behaviour concerning model parameter variations. The sensor geometry is analyzed in detail, featuring a study of the influence of the …main parameters. As an outcome of parameter analysis, it was possible to determine the influence of the sensor parameters on the output signal of the sensor. In addition, this study aims to advance the understanding of the physical behaviour of passive wheel speed sensors by three-dimensional nonlinear finite element analysis, which is missing from the literature. Show more

Keywords: Wheel speed sensor, passive sensor, parameter analysis, 3D finite element method

DOI: 10.3233/JAE-190002

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2019

Authors: Zhai, Mingda | Long, Zhiqiang | Li, Xiaolong

Article Type: Research Article

Abstract: The medium-low speed maglev train is an entirely new way of transportation without wheels, and it makes the best of the attraction between the electromagnet and the F-type track to achieve levitation. The magnetic levitation system is considered as the wheels of medium-low speed maglev train, which plays a major role in bearing the weight of vehicle. The theoretical calculation and finite element numerical analysis are performed to calculate the load performance of the magnetic levitation system under different load conditions. The difference of calculation results between the two methods is analyzed and discussed. In addition, a series of load-carrying …tests in vehicles operating on Changsha maglev express is carried out. The experimental results have revealed that the calculation results based on FEM are basically matched with that of actual well conditions. Therefore, the load performance of the magnetic levitation system in medium-low speed maglev train is calculated and evaluated successfully. Show more

Keywords: Medium-low speed maglev train, magnetic levitation system, load performance, FEM, calculation

DOI: 10.3233/JAE-190031

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-18, 2019