耿森林, 李芳菊. 大颗粒粮食中声传播性质研究[J]. 云南大学学报(自然科学版), 2008, 30(6): 583-586.
引用本文: 耿森林, 李芳菊. 大颗粒粮食中声传播性质研究[J]. 云南大学学报(自然科学版), 2008, 30(6): 583-586.
GENG Sen-lin, LI Fang-ju. Sound propagation characteristic in grain with large kernel[J]. Journal of Yunnan University: Natural Sciences Edition, 2008, 30(6): 583-586.
Citation: GENG Sen-lin, LI Fang-ju. Sound propagation characteristic in grain with large kernel[J]. Journal of Yunnan University: Natural Sciences Edition, 2008, 30(6): 583-586.

大颗粒粮食中声传播性质研究

Sound propagation characteristic in grain with large kernel

  • 摘要: 从颗粒介质模型出发,对粮食中声传播性质进行了研究.结果发现:大颗粒粮食介质的声学性质与动粘滞率有关,低频下,粘滞起主要作用,高频下,惯性起主要作用.其声传播都是频散的,并且随频率增加而增加,低频时接近于正比变化,扭曲率的存在使得声速变小.

     

    Abstract: With kernel medium model,sound propagation characteristic in grain is studied.It shows that sound characteristic in grain with large kernel has to do with kinematic viscosity,viscosity plays a great role under low frequency and inertia does under high frequency.Sound propagation velocity causes frequency dispersion and it increases with frequency,which does in direct proportion under low frequency,tortuosity makes sound propagation velocity reduced.

     

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