新型无轴泵喷推进器线谱噪声产生机理及抑制技术研究

With the control of submarine mechanical noise, the propeller-shaft-hull coupling vibration induced underwater noise becomes a new bottleneck for submarine stealth. The shaftless pumpjetis a novel integrated motor propulsor, also named rim-driver. The PM motor with high power density as well as the radial/axial bearing is integrated in the pumpjet, which eliminate the traditional shaft and vibration source coming from propeller-shaft system. Meanwhile, the electromagnetic noise and bearing noise, however, are introduced and coupled with hydrodynamic noise, which enhances the complexity of the line-spectrum noise source. So, the suppression of line-spectrum strength and reduction its acoustic fingerprint characteristics highlight to be key factors to pumpjet. This project focuses on the mechanism of line-spectrum generation and quantificational evaluation of the pumpjet noise radiation from theoretical analysis, numerical simulation and prototype test. Then, sensitivity analysis of noise with multi-factors is conducted, so as to identify main factor that affect the line-spectrum, based on which some suppression schemes are to be brought up and validated by follow-up comparison test.

随着潜艇机械噪声的降低，潜艇桨轴系统耦合振动引起的辐射噪声成为制约潜艇减振降噪新的瓶颈。无轴泵喷推进技术将高功率密度永磁电机、一体化轴承集成于推进器中，取消了传统的推进轴系，消除了桨轴系统耦合振动这一重要噪声源，但同时引入了电磁噪声、轴承噪声两大噪声源，且二者与水动力噪声交叉耦合，这使得推进器噪声线谱来源更加复杂，因此如何控制无轴泵喷推进器线谱噪声、减小其声指纹特征将成为突破无轴泵喷推进技术的关键。本课题拟从理论分析、数值仿真、样机试验三个方面对无轴泵喷推进器的主要线谱噪声产生机理、线谱来源及定量评估展开研究，并通过对电磁噪声、水动力噪声、轴承噪声的多参数灵敏度分析，确认影响推进器强线谱的主要因素，提出抑制线谱噪声的解决措施，最后通过对比试验来检验线谱抑制技术的有效性。

随着潜艇机械噪声的降低，潜艇桨轴系统耦合振动引起的辐射噪声成为制约潜艇减振降噪新的瓶颈。无轴泵喷推进技术将高功率密度永磁电机、一体化轴承集成于推进器中，取消了传统的推进轴系，消除了桨轴系统耦合振动这一重要噪声源，但同时引入了电磁噪声、轴承噪声两大噪声源，且二者与水动力噪声交叉耦合，这使得推进器噪声线谱来源更加复杂，因此如何控制无轴泵喷推进器线谱噪声、减小其声指纹特征将成为突破无轴泵喷推进技术的关键。本课题从理论分析、数值仿真、样机试验三个方面对无轴泵喷推进器的主要线谱噪声产生机理、线谱来源及定量评估展开研究，并通过对电磁噪声、水动力噪声、轴承噪声的参数影响分析，确认影响推进器强线谱的主要因素，提出抑制线谱噪声的解决措施，最后通过对比试验来检验线谱噪声定量评估技术及抑制技术的有效性。