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Axial power flow distributions of ultrasonic guided waves in viscous liquid-filled pipes
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作者 TA Dean (Department of Electronic Engineering, Fudan University, Shanghai 200433, China) 《声学技术》 CSCD 2004年第S1期18-22,共5页
The axial power flow (APF) magnitude and attenuation distributions of ultrasonic longitudinal guided waves in viscous liquid-filled elastic pipes are investigated. The optimal location, optimal mode and its frequency-... The axial power flow (APF) magnitude and attenuation distributions of ultrasonic longitudinal guided waves in viscous liquid-filled elastic pipes are investigated. The optimal location, optimal mode and its frequency-thickness product (fd) for the test of pipes filled with viscous liquid are chosen according to APF and attenuation distributions. The results show that the APF magnitude distribution is an important parameter in choosing the modes and parameters. A particular mode has weak dispersion in ranges of fd values with large group velocity, while other modes with smaller group velocity in the same fd ranges have stronger dispersion. It has been observed that, within these ranges, the chosen mode has a larger APF on the (pipe’s) wall. Therefore, in the region of fd values where a particular mode has a large group velocity, this mode will be effective to be used in testing elastic pipes filled with viscous liquid. The results obtained from both the APF analysis and attenuation distribution are consistent. 展开更多
关键词 guided waves viscous liquid-filled elastic pipes AXIAL power flow (APF) ATTENUATION
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阻尼对弹性管道中孤波运动的影响
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作者 罗剑兰 颜家壬 《湘潭大学自然科学学报》 CAS CSCD 1993年第3期56-59,共4页
本文用微扰理论的研究方法,求出了阻尼较小但不能忽略的情况下,弹性管内流体运动非线性问题中孤立波随时间的演变规律.结果表示阻尼使孤波逐渐变矮,增宽、发生形变且波的传播速度减慢,能量逐渐耗散,最后导致孤波消失。
关键词 孤波 弹性管道 阻尼 流体运动
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