阵列形式及阵元失效对统计最优近场声全息重建结果的影响分析

为探究阵列形式以及阵元失效两种阵列因素对声场重建结果的影响,基于统计最优近场声全息(Statistically Optimal Near-field Acoustical Holography,SONAH)理论,仿真计算了网格阵列、圆形阵列、均布非规则阵列的声场重建结果。得出:网格阵列和均布非规则阵列都能准确识别声源位置,圆形阵列不能用于SONAH声场重建;模拟研究了典型失效模式下阵元失效产生的影响,结果表明:阵元失效后在失效点处会出现伪声源,其大小与失效点和声源距离有关。由此给出并分析了阵元失效的补偿方法,基于该方法对典型失效模式进行了算例仿真并分析计算了重建误差限,结果显示:采用该方法能消除伪声源,较好地识别声源位置。从而验证了该方法的有效性,为实际工程测量提供了指导与借鉴。

The influence of array geometry and element failure on SONAH reconstruction results

To explore the influence of array geometry and array element failure on sound field reconstruction results, the sound field reconstruction results of grid array, circle array and approximate evenly distributed irregular array, based on Statistically Optimal Near-field Acoustical Holography（SONAH） theory, were simulated. Results show that grid array and approximate evenly distributed irregular array can accurately identify the sound source position, while circle array cannot be used in SONAH sound field reconstruction. The influence of element failure was researched in typical failure modes, and the results indicate that pseudo sources appear in the failure point positions after the elements are failure, and the amplitudes of the pseudo sources are related to the distances between failure points and sound source. Thus the element failure compensation method is analyzed and given. The typical failure mode simulation and the reconstruction error range calculation show that this method can eliminate the pseudo sources and identify the sound source position accurately. The results not only verify the effectiveness of the method, but also provide guidance and reference for practical engineering measurements.