Research vessels are important carriers of the strategy of building a strong maritime power, and the underwater radiated noise is an important factor affecting the accuracy of research operation and marine ecological environment, so higher requirements are put forward for the control level of underwater radiated noise. The development of the underwater radiated noise control technology for research vessel presented the trend of full-cycle control and intelligence. The method of the full life cycle control of research vessel underwater radiated noise is summarized. Acoustic control technology for the design, construction, mooring commissioning and operation phases are introduced in sequence, with a focus on acoustic intelligent control for the operation phase. Combined with the digital twin technology, the future research direction is envisioned, aiming to provide a reference for relevant researchers to ensure the low-noise performance of the research vessel in the whole life cycle, to improve the efficiency of the research operation and the operation precision, supporting the development of the low noise technology for high-tech ships.

The Maritime Labour Convention (2006) demands the improvement of the ship living environment. The lighting system with the widest coverage of the working and living environment on board has been studied in order to improve the ship environment. A human factors design method of the ship lighting system is proposed according to the optical biological effect theory, with detailed design procedures. The feasibility of the design method is proved based on the design process of a full-scale ship. This proposed design method can optimize the ship lighting system design and improve the seafarer's working and living environment.

The development of new energy has attracted the attention of all countries in the world. The grid-tied inverters connect the new energy resources and the power grid. LCL filter is used to suppress PWM harmonics caused by the inverter pulse width modulation. The zero impedance characteristics of LCL filter at the resonant frequency will cause the system resonance which endangers the stability of the system. Firstly, the paper analyzes the variation of the equivalent impedance of the ship multi-inverter parallel system, which drifts the LCL filter resonant frequency. Secondly, a harmonic suppression strategy for the shipboard grid-connected inverters is proposed, which can ensure the stability and effectiveness of the harmonic suppression of the single-phase LCL-filter-based grid-tied inverters system. At last, simulations based on PSIM 9.0 have been presented to verify the effectiveness of the proposed method.