粮食声传播吸声特性的研究  

Sound Absorption Property of Various Type Grains

作　　者：张林[1] 左晓戎[2] 吴群力[3] 逯还通[3] 

机构地区：[1]中国农业大学,北京100083 [2]国家粮食局科学研究院,北京100037 [3]北京声望声电技术有限公司,北京100029

出　　处：《中国粮油学报》2008年第3期186-188,共3页Journal of the Chinese Cereals and Oils Association

摘　　要：为了研究粮堆声传播的基本理论,采用声阻抗管传递函数法对小麦、精米、糙米、大豆、稻谷、玉米六种粮食进行吸声系数的测量。探讨了粮食的吸声频谱性质并分析了粮食吸声谱随粮层物理状态不同而出现的变化规律。In order to study basic theory of sound transmitting in grain, the method of transfer function in impedance tube was used to measure the absorption property of wheat, rice, brown rice, soybean, paddy and com. The property of sound absorption coefficient as a function of frequency in grain is explored and presented in this paper, and the variety orderliness of sound absorption spectrum with the difference of grain layer physical state is discussed.

关 键 词：粮食 吸声系数 阻抗管 传递函数 

分 类 号：TU112.5[建筑科学—建筑理论] O422[理学—声学]