声波聚焦技术防治农作物虫害的可行性分析

为探明声波聚焦技术防治区域范围内农作物病虫害的可行性,采用阵列指向性理论、Matlab仿真及基于智能声波发生系统的测试试验,对不同结构声阵列和影响y=a|x|阵列指向性的影响因子进行研究。对比结果表明:1)抛物线和y=a|x|阵列较线性阵列有明显的单向指向性;2)增加点声源的个数或点声源之间的间距能提高y=a|x|阵列指向性,但导致其抑制旁瓣能力降低;3)选择合理的参数a可以提高y=a|x|阵列的指向性;4)y=a|x|阵列结构简单,决定了其在防治农害虫应用上的优越性。因此,总体上y=a|x|阵列优于线性阵列和抛物线阵列,利用y=a|x|阵列实现声波聚焦技术为远距离防治区域范围内农作物害虫提供了一定的理论和试验基础。

Analysis on feasibility of prevention of crop pests through acoustic focusing technology

In order to evaluate the feasibility of preventing a certain range of crop pests with the technique of acoustic focusing, through the theory of acoustic array,Matlab simulation and testing experiment based on intelligent acoustic system,the different structure array and influence factors of y=a|x| array''s directivity were studied in this paper.Comparative study showed that:1) y=a|x| array and parabolic array had obviously unilateral directivity comparing to the linear array;2) the increasing of the number of acoustic sources and spacing among them could improve directivity,but reduced the ability of suppressing sidelobe;3) the reasonable choice of parameter a could improve y=a|x| array''s directivity;4) the simple structure of y=a|x| array determined the superiority of preventing crop pests.As a result,y=a|x| array was better than linear array and parabolic array.The results derived from this study would provide a theoretical and experiment basis for preventing a range of crop pests through y=a|x| array resonant acoustic focusing technology.