Gearbox is one of the main vibration sources of the ship's power transmission system. In order to study the vibration performance and optimization measures of the ship gearbox, and then realize the low noise of the ship, taking a ship gearbox as an example, through combining bench test and vibration spectrum analysis, the main factors affecting the vibration of the gearbox are analyzed, and the relevant key factors are optimized and improved. According to the results of vibration analysis, the gearbox is optimized from two aspects: gear modification design and improvement of hydraulic oil supply system. And after taking optimization measures the gearbox is verified by vibration test and vibration spectrum analysis. The results show that the vibration performance of gearbox has been effectively improved by gear modification and hydraulic oil supply system improvement. In the case of this paper, after gear modification, the vibration peak value at gear meshing frequency is reduced by 40.2% and the total vibration level is reduced by 1.85dB. After further measures of hydraulic oil supply system improvement, the total vibration level of gearbox is reduced by 9.99dB. Gear modification and hydraulic oil supply system improvement have engineering application value for improving vibration performance of ship gearbox. © 2020, Editorial Department of Journal of Propulsion Technology. All right reserved.
