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水表面波矩型谐振器非线性共振曲线的测量   总被引:3,自引:0,他引:3       下载免费PDF全文
本文是在作者最近发现的非传播型水表面孤波的基础上对有关机制的进一步探讨。实验表明水表面波矩型谐振器非线性共振曲线可向低频端或向高频端偏移,决定这种偏移方向的参数是平衡时液面的高度。作者并系统地测量了在不同液面高度下的共振曲线,确定了共振曲线在非线性响应下不发生偏移的转换液面高度。 关键词:  相似文献   
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Experimental results have shown that in the megahertz frequency range the relationship between the acoustic attenuation coefficient in soft tissues and frequency is nearly linear. The classical continuum mechanics (CCM), which assumes that the materiaJ is uniform and continuous, faJls to explain this relationship particularly in the high megahertz range. Doublet mechanics (DM) is a new elastic theory which takes the discrete nature of material into account. The current DM theory however does not consider the loss. We revise the doublet mechanics (DM) theory by including the loss term, and cMculate the attenuation of a soft tissue as a function of frequency using the modified the DM theory (MDM). The MDM can now well explain the nearly linear relationship between the acoustic attenuation coefficient in soft tissues and frequency.  相似文献   
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