仓储粮食中害虫活动声功率谱特征研究

Studying frequency characteristic of insect activity sound in grain

通过建立粮食中害虫活动声的无规声源模型,对赤拟谷盗(Tribolium castaneum Herbst)成虫分别在小麦、大豆和玉米中的爬行声以及赤拟谷盗成虫、黑菌虫(Alphitobius diaperinus Panzer)成虫和米象(Sitophilus oryzae Linnaeus)成虫分别在小麦中的爬行声进行采集.研究了爬行声信号的功率谱特征.结果表明,害虫在粮食中的爬行声功率谱为离散谱,其特征不仅受害虫种类影响,而且与粮食种类有关.

The acoustical model of grain pest creeping is set up with a random sound source, the creeping sound are sampled for 20 Alphitobius diaperinus Panzer adults in wheat, soybean and corn, 20 Tribolium castaneum Herbst adults, 20 Alphitobius diaperinus Panzer adults, 20 Sitophilus oryzae Linnaeus in wheat respectively. The creeping sound power spectrum characteristic is presented. The results show that the power spectrum of the insect creeping in grain is a dispersed spectrum, and its characteristic lies on not only the kind of insect but the species of grain.