It’s necessary to equip the ship cabins with suitable air purification device which can ensure the ship’s air quality without affecting the physical and mental health of the crew living in the limited space of a ship during ocean voyage. In this paper, zeolite’s characteristics and application in air purification are introduced, and three different types of air purification filters are designed with zeolite particles as main materials, then three development programs of air purification engineering machine for ship cabins are proposed based on modular design concept. The air-purifying machine models proposed in this paper have been trial-produced and tested, which provides new choices for ship cabins’ air-purifying devices.

The AC frequency conversion speed regulation technology has been used widely in the ship field for its excellent operating and control characteristics, whereas it can also bring out negative effects such as the common-code voltage on the drive system. The analysis is made on the common-mode voltage of the SPWM frequency conversion speed regulation system, including its generation mechanism, spectrum features, negative effects and suppression methods, which provides beneficial reference and enlightenment for the improvement of the SPWM frequency converter technical performance as well as the equipment maintenance and management.