| Nearfield acoustic holography in a moving medium based on particle velocity input using nonsingular propagator |
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| 作者姓名： | 董必春 张润梅 袁彬 俞传阳 |
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| 作者单位： | Department of Mechanical & Electrical Engineering School, Anhui Jianzhu University, Hefei 230601, China |
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| 基金项目： | supported by the National Natural Science Foundation of China(Grant No.11804002);the University Science Research Project of Anhui Province,China(Grant Nos.KJ2019A0792 and KJ2019A0797);the Anhui Jianzhu University Research Project(Grant No.2018QD06)。 |
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| 摘 要： | Nearfield acoustic holography in a moving medium is a technique which is typically suitable for sound sources identification in a flow.In the process of sound field reconstruction,sound pressure is usually used as the input,but it may contain considerable background noise due to the interactions between microphones and flow moving at a high velocity.To avoid this problem,particle velocity is an alternative input,which can be obtained by using laser Doppler velocimetry in a non-intrusive way.However,there is a singular problem in the conventional propagator relating the particle velocity to the pressure,and it could lead to significant errors or even false results.In view of this,in this paper,nonsingular propagators are deduced to realize accurate reconstruction in both cases that the hologram is parallel to and perpendicular to the flow direction.The advantages of the proposed method are analyzed,and simulations are conducted to verify the validation.The results show that the method can overcome the singular problem effectively,and the reconstruction errors are at a low level for different flow velocities,frequencies,and signal-to-noise ratios.
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| 关 键 词： | nearfield acoustic holography moving medium particle velocity nonsingular propagator |
| 收稿时间： | 2021-11-18 |
Nearfield acoustic holography in a moving medium based on particle velocity input using nonsingular propagator |
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| Bi-Chun Dong,Run-Mei Zhang,Bin Yuan,Chuan-Yang Yu.Nearfield acoustic holography in a moving medium based on particle velocity input using nonsingular propagator[J].Chinese Physics B,2022,31(2):24303-024303. |
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| Authors: | Bi-Chun Dong Run-Mei Zhang Bin Yuan Chuan-Yang Yu |
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| Affiliation: | Department of Mechanical & Electrical Engineering School, Anhui Jianzhu University, Hefei 230601, China |
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| Abstract: | Nearfield acoustic holography in a moving medium is a technique which is typically suitable for sound sources identification in a flow. In the process of sound field reconstruction, sound pressure is usually used as the input, but it may contain considerable background noise due to the interactions between microphones and flow moving at a high velocity. To avoid this problem, particle velocity is an alternative input, which can be obtained by using laser Doppler velocimetry in a non-intrusive way. However, there is a singular problem in the conventional propagator relating the particle velocity to the pressure, and it could lead to significant errors or even false results. In view of this, in this paper, nonsingular propagators are deduced to realize accurate reconstruction in both cases that the hologram is parallel to and perpendicular to the flow direction. The advantages of the proposed method are analyzed, and simulations are conducted to verify the validation. The results show that the method can overcome the singular problem effectively, and the reconstruction errors are at a low level for different flow velocities, frequencies, and signal-to-noise ratios. |
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| Keywords: | nearfield acoustic holography moving medium particle velocity nonsingular propagator |
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