He Zhengyao, Ma Yuanliang
Institute of Acoustic Engineering, Northwestern Polytechnical University, Xi'an, 710072, China.
J Acoust Soc Am. 2008 May;123(5):2563-9. doi: 10.1121/1.2897046.
A method is presented to calculate the driving-voltage weighting vector of a conformal array of underwater acoustic transmitting transducers to obtain a low-sidelobe beam pattern based on the measured receiving array manifold. The relationship among three quantities is given, which are, respectively, the radiated acoustic field, the measured receiving array manifold matrix and the driving-voltage weighting vector of the transducer array. Then, the driving-voltage weighting vector of the array is calculated using the optimization method to obtain a low-sidelobe transmitting beam pattern. At the frequency of 12.5 kHz, the receiving array manifold matrix of a 27-element conformal array is measured in an anechoic water tank. The driving-voltage weighting vector of the array is calculated using the proposed method. In addition, the computer simulation and experiments are carried out. The results agree well and show that the proposed method can obtain a low-sidelobe transmitting beam pattern and at the same time provide the largest amplitude of pressure in the axial direction when the maximum amplitude of the driving voltages of the array elements keeps unchanged.
提出了一种基于测量的接收阵列流形来计算水下声学发射换能器共形阵列的驱动电压加权矢量，以获得低旁瓣波束图的方法。给出了三个量之间的关系，这三个量分别是辐射声场、测量的接收阵列流形矩阵和换能器阵列的驱动电压加权矢量。然后，使用优化方法计算阵列的驱动电压加权矢量，以获得低旁瓣发射波束图。在12.5kHz频率下，在消声水箱中测量了一个27元共形阵列的接收阵列流形矩阵。使用所提出的方法计算了阵列的驱动电压加权矢量。此外，还进行了计算机模拟和实验。结果吻合良好，表明所提出的方法能够获得低旁瓣发射波束图，并且在阵列元件驱动电压的最大幅度保持不变时，同时在轴向提供最大的压力幅度。
