Observation of Waves Radiated from Circular Cylinders Caused by an Incident Pulse
Observation of Waves Radiated from Circular Cylinders Caused by an Incident Pulse
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DOI：
10.1121/1.1912254
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发表时间：
1970-11
影响因子：
2.4
通讯作者：
W. G. Neubauer;L. R. Dragonette
中科院分区：
文献类型：
--
作者：
W. G. Neubauer;L. R. Dragonette
利用纹影可视化技术和水听器测量技术，对声脉冲入射到水中金属圆柱体上时产生的辐射波前进行了观测。考虑了尺寸参数ka从138到1419的范围。波前位置由横波和纵波的折射、内反射和辐射来追踪。在固体圆柱体的情况下，许多波前显示出明显的圆周属性，来自于能量从法线入射到适当的临界角。尽管圆周特性得到了验证，但将这些波前之一识别为由先前识别的“瑞利型”波传播和单个入射角引起的被否认。一个先前确定的更快的圆周波是由于直接压缩传输和越来越多的内部反射的复合波前。其他波前依赖于模式转换也被确定。一种机制……
Schlieren visualization and hydrophone measurements are used to observe the radiated wavefronts which result when an acoustic pulse is incident on a metal cylinder in water. The range of size parameter ka from 138 to 1419 is considered. The wavefront positions are traced by the refraction, internal reflection, and radiation of shear and compressional waves. In the case of solid cylinders, many wavefronts display an apparent circumferential property derived from the incidence of energy from the normal to the appropriate critical angle. Identification of one of these wavefronts as resulting from previously identified “Rayleigh‐type” wave propagation and a single incident angle is denied, although the circumferential property is verified. A previously identified faster circumferential wave is attributed to a composite wavefront resulting from direct compressional transmission and an increasing number of its internal reflections. Other wavefronts depending on mode conversions are also identified. A mechanism ...