粮食中声波传播理论模型的建立及实验验证  

The establishment of a sound transmit model in grain and its experimental verification

作　　者：郭敏[1] 尚志远[2] 耿森林[2] 

机构地区：[1]陕西师范大学计算机科学学院,陕西西安710062 [2]陕西师范大学物理与信息技术学院应用声学研究所,陕西西安710062

出　　处：《云南大学学报（自然科学版）》2005年第3期228-231,共4页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(10274047).

摘　　要：以Biot的流体饱和多孔介质声传播理论为基础,对Biot理论中忽略双相介质间热效应的问题进行了修改,同时将Johnson模型拓广到颗粒介质(粮食)中,认为粮食颗粒间孔隙既有圆柱形又有平行狭缝状,建立了粮食颗粒中声波传播理论模型,利用这一模型对粮食吸声系数进行了计算,计算值与实验值吻合较好.Basing on Biot's theory of acoustic propagation in porous media saturated by fluid correcting the point on ignoring the heat effect between two phases of midia,it is applied Johnson's model to grain media.The pores in grain both cylindrical pore and parallel slits are considered and a sound transmit model in grain is found.Using the model,the sound absorption coefficient in grain has been calculated.The agreement between calculation and measurement is good.

关 键 词：粮食 声传播 吸声系数 

分 类 号：O422[理学—声学]