不同种类蝙蝠外耳本征声场波束的计算和功能分析

发布时间：2018-04-20 02:14

本文选题：智能天线 + 有限元　；参考：《南京大学学报(自然科学)》2017年01期

【摘要】：现在使用的智能天线主要通过对阵列天线相位的调制进而调节声场波束,而不同种类蝙蝠仅通过两个外耳对声音反射,就对声场波束形成起到重要作用,所以研究不同种类蝙蝠外耳对接收回波调节作用的声学共性对智能天线改进具有重要作用.共选取30只蝙蝠外耳,利用有限元声场模拟得到蝙蝠声场波束,并对声场波束的指向进行归一化和球面小波压缩,初步利用主成分分析法应用到不同种类蝙蝠的特征分析中,通过主成分分析方法得到蝙蝠本征波束以及平均声纳波束,并对本征波束进行了叠加分析,只考虑了最大本征值和第二本征值对应的第一和第二本征向量,并分析了其作用,分析表明:1)第一本征向量的叠加明显调整了主瓣的宽度,而第二本征向量的叠加则使主瓣在方位角和仰角方向的宽度交替变化;2)在本征空间中,距离远近表示声场波束相似程度,本征波束的分析对区分不同属的蝙蝠具有一定作用.
[Abstract]:Now the smart antenna is used to modulate the phase of the array antenna and then adjust the sound field beam. While the different kinds of bats reflect the sound by only two external ears, it plays an important role in the sound field beamforming. Therefore, the study of the acoustic generality of different kinds of bat external ears to the receiving echo modulation is improved. The external ear of 30 bats was selected and the sound field beam of bats was obtained by the finite element sound field simulation, and the direction of the sound field beam was normalized and the spherical wavelet compression was used. The principal component analysis was applied to the characteristic analysis of different kinds of bats, and the eigenbeams and the average of the bats were obtained by the principal component analysis method. The sonar beam is superimposed on the eigenbeams. Only the maximum eigenvalues and the first and second eigenvectors corresponding to the second eigenvalues are considered, and their functions are analyzed. The analysis shows that: 1) the superposition of the first eigenvectors obviously adjusts the width of the main lobe, while the superposition of the second eigenvectors makes the main lobe in the azimuth and elevation direction. The width alternately; 2) in the eigenspace, the distance is far and near to indicate the similarity of the sound field beam. The analysis of the eigenbeams has a certain effect on the differentiation of different species of bats.

【作者单位】：济南大学物理科学与技术学院;山东大学物理学院;泰山医学院放射学院;
【基金】：国家自然科学基金(11404140;11104355) 山东省优秀中青年科学家科研奖励基金(BS2013SF001;ZR2016AB13) 济南大学博士基金(XBS1332;XBS1610;XKY1637)
【分类号】：O422.2

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