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- 저자 : Kangping Gao (검색결과 2 건)
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Kangping Gao,Xinxin Xu,Jiabo Li,Shengjie Jiao,Ning Shi 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
Aiming at the problem that the traditional filtering method will filter out some useful signals when extracting weak fault features of rotating machinery, resulting in the loss of characteristic signals, a method for extracting weak fault features based on sin-cosine algorithm (SCA) is proposed. Combining the sensitivity of kurtosis to impact signals and correlation coefficients to interference noise, the paper proposes a new stochastic resonance (SR) performance evaluation index-weighted power spectrum kurtosis (WPSK), which solves the shortcoming of the traditional evaluation index that the fault frequency needs to be known in advance. The structural parameters of the SR are optimized by the SCA to improve the “resonance” effect. The SCA-based SR method is applied to the weak feature extraction of faulty bearings and compared with the SR model of particle swarm optimization, the results show that when the bearing inner-race fails, the value of WPSK increases by 33.5 %, and when the outerrace fails, the value of WPSK increases by 44.1 %.
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Operating area analysis and design of WPT systems with MEPT control
Weipeng Gao,Yanfang Fan,Chengxuan Wang,Kangping Wang,Hongchang Li 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.4
Coupled resonant tanks are key parts of wireless power transfer (WPT) systems with magnetic resonant coupling. Researchers have proposed different resonant tank design methods to improve power transfer efficiency, increase power density, reduce magnetic flux leakage, or lower VA ratings. Practical WPT systems require a closed-loop control to cope with the variations of operation conditions, but only a few studies have considered the safe operating area (SOA) of systems under closed-loop control in resonant tanks designs. In this work, we analyze closed-loop voltage and current stress characteristics from the aspect of maximum efficiency point tracking control and derive the SOA with a given set of stress limits. Then, we propose a resonant parameter design method of allowing the system to safely operate with any specified range of coupling coefficient and output power. The current stress was minimized in the design to reduce the conductive loss. As for the verification, an experimental prototype was built according to the design method.
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