粮食声传播吸声特性的研究

Sound Absorption Property of Various Type Grains

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.