Objective To further enhance the vibration and noise reduction capabilities and address environmental adaptability issues of an air purifier in a closed cabin, which had undergone flow-channel optimization based on simulation analysis, while maintaining structural dimensions, power consumption, and ensuring functional performance （airflow rate and purification quality）.

Method Initially, a small batch of prototypes with optimized flow channels was produced by selecting the best motor and improving dynamic balance precision, and prototypes meeting performance requirements were identified. Subsequently, the flow channel was further improved, blade size was reduced, and dynamic balance precision was enhanced to lower the vibration acceleration level （VAL） and sound pressure level （SPL）. However, it was found that the compliance rate of motor vibration and noise was too low, and the prototype had environmental adaptability issues. Therefore, the motor was refined, the filter structure was altered, and the installation method was changed to further improve the prototype, followed by relevant testing.

Results The test results demonstrated that the refined motor significantly reduced the vibration and noise levels of the prototype. Integrating the filter structure with the purification airflow channel effectively decreased the vibration acceleration amplitude in the 1/3 octave band centered at the fundamental frequency. Specifically, the VAL （10 Hz-10 kHz） was reduced to below 104 dB, the SPL （20 Hz-20 kHz） was reduced to below 60 dB（A）, and the vibration acceleration level in the 1/3 octave band centered at the fundamental frequency was reduced to below 90 dB.

Conclusion The improved air purifier for the closed cabin significantly enhanced the maintainability and safety during filter replacement operations and improved the vessel's stealth capabilities. The improved prototype met the requirements of the latest technical specifications and provided a basis for further improvement.