轴承间距对水下结构振动与声辐射影响研究

摘要

Shafting vibration is one of the main causes of underwater structure vibra‐acoustic radiation . In order to study the effect of shafting bearing spacing on the vibration acoustic radiation of underwa‐ter structure ,a finite element model of shaft system is established ,as well as a fluid‐structure interac‐tion model of underwater structure .And then the radiated sound power level ,the mean‐square veloci‐ty level ,the radiated sound pressure level at 100‐meter field point and the acoustic radiation efficiency of the underwater structure are calculated through the method of FEM/BEM .The results show that as the bearing spacing changed within a certain range ,the peak frequency of the radiated sound power level ,the mean‐square velocity level ,the radiated sound pressure level at 100 meter field point and the acoustic radiation efficiency of the underwater structure also changed linearly .%轴系振动是水下结构振动声辐射的主要因素之一。为研究轴系轴承间距对水下结构振动声辐射的影响，建立了轴系的有限元模型，以及水下结构的流固耦合模型。利用有限元／边界元的方法，分析计算了水下结构的辐射声功率级、均方法向速度级和100 m场点处辐射声压级，以及结构声辐射效率。结果表明：轴承间距在一定范围内变化，水下结构的辐射声功率级、均方法向速度级和100 m处辐射声压级的峰值频率也随之变化。