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Yanyan Nie,Fangyi Li,Liming Wang,Jianfeng Li,Yanle Li,Mingshuai Sun,Mengyao Wang,Guoyan Li 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.1
As a kind of green energy, wind energy has become cost-competitive mainstream energy in the world. The gearbox is one of the most important and vulnerable components in the wind turbine (WT), which suffers a high failure rate and downtime. It is of great significance to the condition monitoring and fault diagnosis of the WT gearbox. However, in the multistage WT gearbox, the vibrations generated from different stages are coupled, which leads to a complex vibration spectral structure and brings difficulties in condition monitoring and fault diagnosis. Aiming to understand the vibration frequency features of multistage WT gearboxes, a novel phenomenological vibration model is established and the spectral structure is deduced by using the Fourier series analysis. In the vibration model, the phenomenon of inter-stage meshing frequency modulation (ISMFM) is considered, which is clearly proposed for the first time. The theoretical derivations are validated by both simulation and engineering tests using a 2.0 MW industrial WT gearbox. The results show that under healthy conditions, in addition to the meshing frequencies and their harmonics of each stage, there are also ISMFM sidebands in the vibration spectrum of the multistage WT gearbox, and the amplitude of the sidebands will change with the health status of the gearbox. The findings are not only applicable to the WT gearbox studied in this paper, but also to other similar multistage gearbox systems, which can provide a priori spectral structure for a multistage gear transmission system to assist its condition monitoring and fault diagnosis.
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Yin Hongbiao,Xie Chen,Hu Huimin,Wang Mingshuai 서울대학교 교육연구소 2020 Asia Pacific Education Review Vol.21 No.2
Responding to increased global research interest in teacher educators’ professional lives, this study explores the resilience of Teaching–Research Ofcers, a characteristic type of teacher educators, in the context of mainland China. Based on survey data collected from a nationally representative sample (N=5489), the results show that the Teaching–Research Ofcers surveyed generally favourably evaluated their resilience, as measured by their efcacy beliefs and work engagement, and that their resilience was signifcantly infuenced by various personal, situated, and professional factors. This study extends the research on teacher resilience and provides quantitative evidence supporting the existing conceptual framework. The fndings call for attention to be paid to the roles of professional development programmes and research-related job requirements for teacher educators. The study’s limitations and directions for future research are discussed.
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