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OALib Journal期刊
ISSN: 2333-9721
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马来假吸血蝠耳屏声学特性的数值研究
DOI: 10.13232/j.cnki.jnju.2015.07.028
Keywords: 马来假吸血蝠,耳屏,数值计算,近场声压分布图,波瓣图
Abstract:
马来假吸血蝠耳廓。利用高分辨率x射线微型ct机对马来假吸血蝠耳廓结构进行扫描，得到其耳廓结构的断层扫描图像，通过高斯滤波器和二值化处理，并三维数字结构重构。手工处理这种数字结构，得到原始耳廓结构、无耳屏耳廓结构的三维数字结构。运用数值计算的方法，得到两种耳廓结构不同频率下的近场声压幅度图和远场波瓣图，比较耳廓对近场声压分布和远场辐射的影响。结果表明：耳廓内的耳屏对频率有选择性的影响，在50khz和70khz对近场声压分布影响最大；对远场波瓣图，低频和高频时拆分主瓣，中频时合并旁瓣.
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