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小颗粒粮食介质声传播性质研究 被引量:1
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作者 耿森林 李芳菊 《科学技术与工程》 2009年第5期1246-1249,共4页
从颗粒介质模型出发,对粮食介质中声传播性质进行了研究。结果发现:小颗粒粮食介质系统声学性质与动粘滞率和热效应都有关,除了在低频和高频情况下,空气有效压缩率趋于绝热压缩率外,在中间频率范围,系统的声学性质均受热效应影响,有效... 从颗粒介质模型出发,对粮食介质中声传播性质进行了研究。结果发现:小颗粒粮食介质系统声学性质与动粘滞率和热效应都有关,除了在低频和高频情况下,空气有效压缩率趋于绝热压缩率外,在中间频率范围,系统的声学性质均受热效应影响,有效压缩率变成复数值,且与空隙的形状有关;粘滞和热效应对声传播速度都产生影响,相比之下,热效应影响更大。 展开更多
关键词 颗粒介质模型 声传播性质 动粘滞率 热效应
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Simultaneous Exact Controllability of Wave Sound Propagations in Multilayer Media
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作者 Alexis Rodriguez Carranza Luis. J. Caucha Obidio Rubio Mercedes 《Journal of Mathematics and System Science》 2016年第8期323-329,共7页
In this work we study one problem of mathematical interest for their applications in several topics in Applied Science. We study simultaneous controllability of a pair of systems which model the evolution of sound in ... In this work we study one problem of mathematical interest for their applications in several topics in Applied Science. We study simultaneous controllability of a pair of systems which model the evolution of sound in a compressible flow considered as a transmission problem. We show the well posed of the problem. Furthermore provided appropriate conditions in the geometry of the domain are valid and suitable assumptions on the fluid, is possible to conduce the pair of systems to the equilibrium in a simultaneous way using only one control. 展开更多
关键词 CONTROLLABILITY wave sound H.U.M
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