粮食声传播阻抗特性研究

A Study on Sound Impedance Properties in Various Grains Zhang Lin^1 Zuo Xiaorong^2 Wu Qunli^3 Lu Huantong^3

声阻抗是反映声学材料特性的一个重要参数,为了研究粮堆的基本声学性质,采用阻抗管传递函数法对小麦、精米、糙米、大豆、稻谷、玉米六种粮食进行了声阻抗特性的测量。探讨了粮食的声阻抗频谱性质,分析了声阻抗率随粮层物理状况不同而变化的现象。

Impedance is an important parameter reflecting the sound property of materials, to study the basic sound property of bulk grain, the method of transfer function in impedance tube was used to measure the sound impedance parameters of wheat, milled rice, brown rice, soybean, paddy and corn. The property of sound impedance as a function of frequency is discussed in this paper, and the rule of the sound impedance spectrum changing with different physical state of grain layers is explored.