当空间存在多个相干声源时，现有的声全息方法不能有效地识别在测量面同一侧任意位置的相干声源中的单个声源所产生的声压。为了解决该问题，提出旋转测量面方法，使任意位置的相干声源分别到测量面的距离不相等，同时在相干声源的两侧测量。再结合双面声全息技术，基于二维傅里叶变换，分离出单个声源在全息面的声压。通过对两组不同频率和不同距离的相干声源进行数值仿真和分析，验证了该方法的正确性和有效性。
Abstract
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.
关键词
相干声源 /
旋转测量面 /
声场分离
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Key words
coherent sources /
rotate measurement surface /
sound field separation
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参考文献
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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