Visual Analysis of SPOC Based on Citespace

Anling Zhang , Hantao Yan

Abstract: In order to learn more about the current situation, hot areas and trends of SPOC research, this study used software such as CiteSpace, a visual analysis tool, took the English literature related to SPOC in CNKI database from 2009 to 2021 as the data source, and made a visual analysis of SPOC research from the aspects of overall trend. The keywords were co-occurrence network, clustering analysis and timezone map. The research found that the existing space and shortcomings of the current research, and tentatively put forward the direction of future research. It can provide reference for follow-up research.

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Application of AC Electric Propulsion and Control Technology in Marine Ships

Ruitao Yu

Abstract: Marine electric propulsion has the characteristics of good economy and good system maneuverability. In recent years, more and more small and medium-sized civil ships have gradually adopted AC propulsion technology. With the increase of marine electronic equipment, in the application of electric propulsion technology, more and more marine electronic equipment lead to serious power load exceeding the standard. How to make better use of AC electric propulsion system to achieve dynamic balance of power load is a serious problem. This paper describes the latest progress in the application of marine AC power supply system from the aspects of power electronic devices, frequency converters, permanent magnet motors and AC power control in the development of ship AC power supply system are discussed.

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