充气结构对侏抹香鲸（Kogia breviceps）在水平和垂直平面内波传播和波束形成的影响。
The influence of air-filled structures on wave propagation and beam formation of a pygmy sperm whale (Kogia breviceps) in horizontal and vertical planes.
作者信息
Song Zhongchang, Zhang Yu, Thornton Steven W, Li Songhai, Dong Jianchen
机构信息
Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, People's Republic of China.
Coastwise Consulting, Inc. 173 Virgina Avenue, Athens, Georgia 30601, USA.
出版信息
J Acoust Soc Am. 2017 Oct;142(4):2443. doi: 10.1121/1.5008855.
The wave propagation, sound field, and transmission beam pattern of a pygmy sperm whale (Kogia breviceps) were investigated in both the horizontal and vertical planes. Results suggested that the signals obtained at both planes were similarly characterized with a high peak frequency and a relatively narrow bandwidth, close to the ones recorded from live animals. The sound beam measured outside the head in the vertical plane was narrower than that of the horizontal one. Cases with different combinations of air-filled structures in both planes were used to study the respective roles in controlling wave propagation and beam formation. The wave propagations and beam patterns in the horizontal and vertical planes elucidated the important reflection effect of the spermaceti and vocal chambers on sound waves, which was highly significant in forming intensive forward sound beams. The air-filled structures, the forehead soft tissues and skull structures formed wave guides in these two planes for emitted sounds to propagate forward.
对侏儒抹香鲸（Kogia breviceps）在水平和垂直平面上的波传播、声场及发射波束模式进行了研究。结果表明，在两个平面上获得的信号具有相似的特征，即峰值频率高且带宽相对较窄，与从活体动物记录的信号相近。在垂直平面上头部外部测量的声束比水平平面上的更窄。利用两个平面中充气结构不同组合的情况来研究它们在控制波传播和波束形成中的各自作用。水平和垂直平面上的波传播及波束模式阐明了鲸蜡和声带腔对声波的重要反射作用，这在形成强烈的前向声束方面非常显著。充气结构、前额软组织和头骨结构在这两个平面上形成了波导，使发出的声音向前传播。
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