Far-field acoustic analysis for a finite long pulsating cylinder considering effects of free liquid surface
GUO Wenjie2, LI Tianyun1,3,4,ZHU Xiang1,3,4,LIN Ziqin1,4
1.School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;
2.Engineering Research Center of Railway Environment Vibration and Noise Ministry Education,East China Jiaotong University,Nanchang 330013,China;
3.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China;
4.Hubei Key Lab of Naval Architecture and Ocean Engineering Hydrodynamic,Wuhan 430074,China
Here,an acoustic scattering model of a finite long pulsating cylinder considering effects of free liquid surface was established,and an analytical method to solve the far-field sound pressure was proposed.Using the image method combined with Graf’s addition theorem,the expression for sound pressure in wavenumber domain was deduced.Then,the far-field sound pressure was derived using the stationary phase method.The study results showed that radiated sound and scattered one produce a dipole-like effect due to effects of free liquid surface; the far-field sound pressure’s directional sectioning increases with increase in immersion depth or frequency; the field point sound pressure periodically fluctuates with increase in immersion depth,while the scattering sound pressure fluctuates and decays; if frequency is low and immersion depth is larger than five times of cylinder radius,the mutual scattering effect can be neglected,this provides a reference for how to properly ignore the mutual scattering effect between target and interface within a limited space.
郭文杰2,李天匀1,3,4,朱翔1,3,4,林子钦1,4. 考虑自由液面影响的有限长脉动圆柱远场声学分析[J]. 振动与冲击, 2018, 37(23): 24-30.
GUO Wenjie2, LI Tianyun1,3,4,ZHU Xiang1,3,4,LIN Ziqin1,4. Far-field acoustic analysis for a finite long pulsating cylinder considering effects of free liquid surface. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(23): 24-30.
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