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基于特征解的有限弹性板中声表面波的二维分析 被引量:2

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摘要 通常认为声表面波(Rayleigh波)在无限大弹性板中具有不同的振动模态.确切地说,在板中具有代表对称和反对称模态的并以指数形式衰减和增长的成对模态出现.随着板的厚度的增加,这些成对出现的模态在叠加后将接近半无限弹性体中的表面波模态,当然也具有表面波的变形和速度特征,但在弹性板的表面却有着较大的变形.将有限弹性体表面波的二维理论加以扩展,在展开函数中除了熟知的指数衰减项外还考虑了指数增长项,从而建立了有限弹性板中表面波分析的二维理论.利用这些新的方程,研究了不同厚度弹性板中表面波指数衰减和增长型模态的耦合.发现对于厚度较小的弹性板,这两组模态是强耦合的,在分析中予以全部考虑也就显得非常重要.当弹性板的厚度增加到一定程度,如大于5个波长时,只用厚度衰减模态就可以分析表面波的振动模态,从而可以极大地简化弹性板中表面波分析的二维方程组.
机构地区 宁波大学工学院
出处 《中国科学(G辑)》 CSCD 2007年第1期89-105,共17页
基金 浙江省宁波大学钱江学者基金 国家自然科学基金(批准号:10572065)资助项目
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  • 1李良儿,陈智军,沈晓群,施文康.在旋转的半无限LiNbO_3上传播的声表面波[J].中国惯性技术学报,2005,13(2):80-84. 被引量:5
  • 2严庆文,魏益群,李业隆,沈美娥,朱嘉林.双通道声表面波转速传感器[J].微纳电子技术,2007,44(7):260-262. 被引量:5
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