摘要
流体激励载荷的分布式特性对泵喷推进器的结构声辐射具有重要影响。采用计算流体动力学数值模拟结合自编径向基函数插值获得了推进器结构表面的分布式流体激励脉动压力,利用耦合有限元方法研究了泵喷推进器在其全部表面分布式激励、仅转子表面分布式激励、每个叶片0.7 R处等效三向激励和桨毂处等效三向激励作用下的结构辐射噪声。结果表明:径向基函数插值能够精确地将流体载荷映射到结构网格上;与泵喷全部表面分布式激励下的推进器表面均方振速和辐射声功率、传递至桨毂的传递力相比,转子表面分布式激励的贡献远大于导管和定子表面脉动压力的贡献;每个叶片0.7 R处等效三向激励作用下的响应在量级上有差别;转子桨毂处等效三向激励作用下的响应在特征和量级上均相差较大。
The vibro-acoustic responses of a pump-jet is greatly influenced by the characteristics of distributed unsteady hydrodynamic forces.Aiming at solving vibro-acoustic responses of the pump-jet under hydrodynamic pressure,the pulsation pressure was calculated by employing computational fluid dynamics(CFD),then a mapping method based on the radial basis function(RBF)was established between CFD mesh and structural mesh to obtain the distributed pulsation pressure on structural wet surface,and then the vibro-acoustic responses were calculated by using coupled FEM.Four load cases were studied:the distributed pulsation pressure applied on pump-jet wet surface,the distributed pulsation pressure applied on propeller wet surface,the equivalent pulsation force applied at 0.7 R of the middle line of propeller on both pressure and suction faces of each propeller blade,and the equivalent pulsation force applied at the hub of the propeller.It is shown that the mapping method will yield a distributed pulsation force on structural wet surface with accuracy.Compared with the mean-square velocity,radiated power of the pump-jet and the transmitted force to the hub under the distributed pulsation pressure on pump-jet wet surface,the vibro-acoustic responses produced by the distributed pulsation pressure on propeller wet surface are the most significant contributor;the vibro-acoustic responses produced by the equivalent force at 0.7 R of each propeller blade share almost the same peaks but with different magnitudes;however,the equivalent force applied at the hub will not excite so many modes and the magnitudes are much smaller.
作者
黄修长
师帅康
苏智伟
饶志强
华宏星
HUANG Xiuchang;SHI Shuaikang;SU Zhiwei;RAO Zhiqiang;HUA Hongxing(Fundamental Science on Vibration,Shock and Noise Labrotory,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Labrotory of Mechnical System and Vibration,Shanghai Jiao Tong University,Shanghai 200240,China;Jiangnan Insititute of Technology,Jiangnan Shipyard(Group)Co.,Ltd.,Shanghai 201913,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第10期89-94,113,共7页
Journal of Vibration and Shock
基金
自然科学基金项目(51875336)
科技委创新特区项目。
关键词
泵喷
流体激励力
结构模态
结构振动声辐射
pump-jet
hydrodynamic force
structural modes
vibro-acoustic response
