When there are multiple coherent sources in the space, the current approaches which measure the pressure by the use of a single measurement plane can’t effectively identify the specific source. In order to solve the problem, the method of rotating the measurement surface is put forward, making the distance between coherent sources and the measurement plane is unequal. The measurement is carried at two sides of the coherent sources. Based on the propagation theory and the method of two-dimensional Fourier transform, the specific source between the sources can be separated. Numerical simulation is performed through two groups of coherent sources at different frequency and different distances, and the result verifies the correctness and effectiveness of the proposed method.
Key words
coherent sources /
rotate measurement surface /
sound field separation
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References
1 于飞，陈剑，陈心昭. 双全息面分离声场技术及其在声全息中的应用[J]. 声学学报. 2003; 28(5): 385-389
YU Fei, CHEN Jian, CHEN Xin-zhao. Sound field separation technique with double holographic planes and its applications in acoustic holography [J]. Acta Acoustica. 2003, 28(5): 385-389
2 于飞，陈心昭，陈剑. 单全息面分离声场技术及其在声全息中的应用[J]. 机械工程学报. 2004; 40(2): 112-116
YU Fei, CHEN Xin-zhao, CHEN Jian. Sound field separation technique with single holographic plane and its application in acoustic holography [J]. Chinese Journal of Mechanical Engineering. 2004, 40(2): 112-116
3 Efren F G, Finn J. Sound field separation with pressure and particle velocity measurements [J]. J. Acoust. Soc. Am. 2012; 132(6): 3818-3825
4 Maynard J D, Williams E G, Lee Y. Nearfield acoustic holography: I. Theory of generalized holography and the development of NAH [J]. J. Acoust. Soc. Am. 1985; 78(4):1395-1413
5 Beronesi W A, Maynard J D. Nearfield acoustic holography (NAH) II. Holographic reconstruction algorithms and computer implementation [J]. J. Acoust. Soc. Am. 1987; 81(5): 1307-1322
6 Jorgen H. Basic theory and properties of statistically optimized near-field acoustical holography [J]. J. Acoust. Soc. Am. 2009; 125(4): 2105-2120
7 Juhl P, Gomes J. A comparison of SONAH and IBEM for near-field acoustic holography [J]. Acoustics 08 Paris. 2887-2892
8 Johnson M E, Elliott S J, Baek K H, et al. An equivalent source technique for calculating the sound field inside an enclosure containing scattering objects [J]. J. Acoust. Soc. Am. 1998; 104(3): 1221-1231
9 Scott E C, Donald C M. Finite Impulse Response Utilizing the Principle of Superposition [J]. IEEE Transactions on ultrasonics. 1997; 44(2): 386-398
10 J.Stuart B, Yong J. K. Multi-Reference Methods for Nearfield Acoustical Holography [J]. J. Acoust. Soc. Am. 2011; 129(4): 2491-2508
11 Richard J. R, Courtney B. B. Separation of partially coherent noise sources for application to Nearfield [J]. Acoustical Holography. Noise Control Eng. J. 2008; 56(5): 386-395
12 张永斌，毕传兴，陈剑，等. 基于混合全息算法的多源相干声场分离方法[J]. 机械工程学报. 2007, 43(9): 173-178
ZHANG Yong-bin, BI Chuan-xing, CHEN Jian, et al. Separation method of multiple coherent sources based on hybrid holographic algorithm [J]. Chinese Journal of Mechanical Engineering. 2007, 43(9): 173-178
13 Jerome A. A Bayesian approach to sound source reconstruction: Optimal basis, regularization, and focusing. J. Acoust. Soc. Am. 2012, 131(4): 2873-2890
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