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《Journal of Nanjing University(Natural Sciences)》 2015-S1
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The correlation between ultrasonic emission characteristic and noseleaf shape in two types of horseshoe bat

Zhang Zhiwei;Wang Fuxun;Zhao Xin;Zhuang Qiao;Department of Radiology,Taishan Medical University;Physics School,Shandong University;Science School,Shandong Jianzhu University;  
Finite element method is adopted for the numerical study of the correlation between ultrasonic emission characteristic and noseleaf shape of two types of horseshoe bat.With evolution and natural selection,most bats have developed an ultrasonic echolocation system with high performance,called biosonar,The signal sender is surrounded by complicated wrinkle noseleaf whose position and structure are considered to change the direction of ultrasonic pulse.Experimental studies have suggested noseleaf really has complicated acoustic function.In this paper,the noseleaf samples of Bourret's horseshoe bat and Rufous horseshoe bat are chosen to simulated.The first step is to acquire original biological data.In experiment,high-resolution X-ray micro CT machine is adopted to scan samples of noseleaf of two horseshoe bats to get original digital shadow images.Then the cross-section view of the noseleaves are reconstructed with the method of cone beam reconstruction.These images with 256 gray level are then processed throughGaussian filter and boolean process,and images with clear definition of air and biological tissue could be got.With three-dimensional digital image processing technique,three-dimensional digital image attributes of two horseshoe bat noseleaf are acquired.The near-field sound pressure distribution of the two noseleaves structure is simulated with finite element method,and the far-field sensitivity function is extrapolated based on Kirchhoff integral theorem from near field,to analyze the directivity at azimuth and elevation angles.Finally,the width of noseleaf ultrasonic beam in the direction of elevation angle is measured to get the ultrasonic emission characteristics of the two types of noseleaves.Thus,the correlation between the ultrasonic emission characteristics and the length of noseleaf sella of the two types of bats are gotten through contrast between the length of their noseleaf sella.The result indicates sella plays a significant role in controlling the directivity at elevation angle in the process of emitting ultrasound,and there is obvious negative correlation between the length of sella and ultrasonic frequency.
【Fund】: 国家自然科学基金(11104355 11374193)
【CateGory Index】: O426
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1 Yihui Da;Bin Wang;Zhenghua Qian;State Key Laboratory of Mechanics and Control of Mechanical Structures/College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics;;A Modified Boundary Element Method for Scattering Problem of Rayleigh Wave[J];固体力学学报;2017-05
2 ZHANG Li;LU Guizhen;Department of Communication Engineering,Communication University of China;;Equivalent circuit of the near field communication antenna at low frequency based on composite grid method[J];电波科学学报;2016-06
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5 Zhang Zhiwei;Wang Fuxun;Zhao Xin;Zhuang Qiao;Department of Radiology,Taishan Medical University;Physics School,Shandong University;Science School,Shandong Jianzhu University;;The correlation between ultrasonic emission characteristic and noseleaf shape in two types of horseshoe bat[J];南京大学学报(自然科学);2015-S1
6 Gong Xiangfei;Zhang Shudao;Yang Jiming;University of Science and Technology of China;Institute of Applied Physics and Computational Mathematics;;APPLICATION OF LAGRANGIAN BOUNDARY CONDITIONS BY CHARACTERISTICS METHOD USING TIME-LINE INTERPOLATION IN SPH[J];力学学报;2015-05
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8 QIAN Feng;LIU Xiaojian;School of Physics,Key Lab.of Modern Acoustics,Nanjing University;School of Physics & Electronic Engineering,Changshu Institute of Technology;School of Electronic and Information,Tongji University;;Time of Arrival Estimation Algorithm Based on Delay Locked Loop[J];压电与声光;2015-01
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