International Journal of Applied Electromagnetics and Mechanics - Volume 46, issue 4

Authors: Li, Hongmei | Chen, Hong-En | Yuan, Zhensheng | Cai, Wenlu | Li, Yong | Chen, Zhenmao | Uchimoto, Tetsuya | Takagi, Toshiyuki | Yoshihara, Kensuke

Article Type: Research Article

Abstract: To explore the mechanism of damage-induced magnetization for paramagnetic austenitic stainless steel, the differences of damage-induced magnetizations between an austenitic stainless steel and a carbon steel are experimentally studied. Various plastic strains are introduced into the test-pieces of the austenitic stainless steel of 304 type and S185 carbon steel material. The residual plastic strains and the damage-induced magnetic fields nearby the test-pieces, the volume fraction of the damage-induced ferromagnetic martensitic phase in …austenitic stainless steel test-pieces are measured. The relationships between the residual plastic strain and the damage-induced magnetic field of two materials are investigated and their differences are compared. In addition, by establishing the relationships of the damage-induced magnetic field with the damage-induced martensitic phase, the effect of the phase transformation on the damage-induced magnetization of austenitic stainless steel is analyzed. Show more

Keywords: Plastic deformation, damage-induced magnetization, austenitic stainless steel, carbon steel

DOI: 10.3233/JAE-140105

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 4, pp. 991-996, 2014

Authors: Mlyniec, Andrzej | Ambrozinski, Lukasz | Packo, Pawel | Bednarz, Jaroslaw | Staszewski, Wieslaw J. | Uhl, Tadeusz

Article Type: Research Article

Abstract: The performance of many mechanical structures highly depends on weather conditions in region of operation. One of the main limiting factors of their performance in cold regions is the icing process. Icing of structures can be a reason of mechanical and electrical failures and can be dangerous for people working closely to, for instance, rotating wind turbine blades. To prevent de-icing process an inspection system informing about the possibility of collecting ice on surface of operating …structures is of particular interest. The following work considers a numerical modeling approach and experimental investigations of the ice detection and de-icing process. The proposed numerical model is based on the cohesive-zone approach used to simulate the delamination at the ice/aluminum interface. Model parameters are specified in terms of fracture energy as a function normal and shear deformation at the interface. A linear elastic traction separation law prior to damage and progressive degradation of the material stiffness after failure is assumed. The ice detection and removal is accomplished by ultrasonic waves excited by the piezoelectric transducers. The experimental results for aluminum plate with ice layers are presented. The results confirmed possibility of icing identification by means of piezoelectric transducers, although ice removal effectiveness depends on the thickness of ice layers. Finally, a proposal of a new deicing adaptive system is given. Show more

Keywords: Wave propagation, deicing, adaptive system

DOI: 10.3233/JAE-140091

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 4, pp. 997-1008, 2014

Authors: Hu, Kun | He, Fengyou

Article Type: Research Article

Abstract: Traditional synchronous motor system has complicated structure and is difficult to maintain. In view of the mentioned problem, this paper aims to propose a new structure brushless synchronous motor where AC exciter and synchronous motor using the same core. Two concentric single-phase winding grooves are cut on stator and rotor respectively, with the stator single-phase field winding laying in the stator single-phase winding groove, and the rotor AC induction winding laying in the rotor single-phase winding …groove. The AC power from AC exciter is rectified by the rotating rectifier for the DC field winding. The results of the proposed structural design and FEA of the new structure brushless wound field synchronous motor show that the new structure is simple in structure, low in loss, high in efficiency and promising in its future application. Show more

Keywords: Wound field synchronous motor, AC exciter, rotating rectifier, brushless excitation, finite element analysis

DOI: 10.3233/JAE-140071

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 4, pp. 1009-1019, 2014

Article Type: Other

Abstract: Author Index Volume 46 (2014)

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 4, pp. 1021-1030, 2014