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RISS 인기검색어
- 검색키워드
- 저자 : Ye Pengxiang (검색결과 2 건)
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Analysis of a Novel Double-Stator and Dual-PM Toroidal-Winding Linear Vernier Machine
Wang Mingjie,Ye Pengxiang,Li Yanyan,Liu Sheng 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
Aiming at the problem of low thrust density and large thrust ripple of conventional permanent magnet linear machine, this paper proposes a novel structure of double-stator and dual-PM toroidal-winding linear vernier machine (LVM) with high thrust density and low thrust ripple. The novelty of the proposed machine is adopted double-sided topology, toroidal-winding and permanent magnets (PMs) installed both on the stator side and the mover split teeth to improve thrust density. To emphasize the specificity of proposed dual-PM LVM in aspect of electromagnetic performance, three kinds of conventional LVMs with different topologies are compared with proposed machine by analyzing the air-gap flux density, inductance, no-load EMF, thrust, overload capability and power factor of the machines. The average thrust is increased by 11.5% under rated current, and the thrust ripple is decreased from 22.1 to 2.68% by optimizing the key parameters of the proposed structure. The harmonics contribution of EMF and thrust are discussed by semi-analytical method. The results of the semi-analytical method are in good agreement with the finite element method, which verifies the correctness of the semi-analytical method and proves that the proposed machine has good performance characteristics.
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Kai Wang,Wuxiong Cao,Zhongqing Su,Pengxiang Wang,Xiongjie Zhang,Lijun Chen,Ruiqi Guan,Ye Lu 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.2
Despite proven effectiveness and accuracy in laboratories, the existing damage assessment based on guided ultrasonic waves (GUWs) or acoustic emission (AE) confronts challenges when extended to real-world structural health monitoring (SHM) for railway tracks. Central to the concerns are the extremely complex signal appearance due to highly dispersive and multimodal wave features, restriction on transducer installations, and severe contaminations of ambient noise. It remains a critical yet unsolved problem along with recent attempts to implement SHM in bourgeoning high-speed railway (HSR). By leveraging authors' continued endeavours, an SHM framework, based on actively generated diffuse ultrasonic waves (DUWs) and a benchmark-free condition contrast algorithm, has been developed and deployed via an all-in-one SHM system. Miniaturized lead zirconate titanate (PZT) wafers are utilized to generate and acquire DUWs in long-range railway tracks. Fatigue cracks in the tracks show unique contact behaviours under different conditions of external loads and further disturb DUW propagation. By contrast DUW propagation traits, fatigue cracks in railway tracks can be characterised quantitatively and the holistic health status of the tracks can be evaluated in a real-time manner. Compared with GUW- or AE-based methods, the DUW-driven inspection philosophy exhibits immunity to ambient noise and measurement uncertainty, less dependence on baseline signals, use of significantly reduced number of transducers, and high robustness in atrocious engineering conditions. Conformance tests are performed on HSR tracks, in which the evolution of fatigue damage is monitored continuously and quantitatively, demonstrating effectiveness, adaptability, reliability and robustness of DUW-driven SHM towards HSR applications.
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