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Non-intrusive flowrate measurement and monitoring system of plant-protection unmanned aircraft systems based on pump voice analysis

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International Journal of Agricultural and Biological Engineering 2021年第3期14卷 58-65页

作者： Yang Xu Xinyu Xue Zhu Sun Wei Gu Nanjing Institute for AgriculturalMechanization Ministry of Agriculture and Rural AffairsNanjing 210014China Sino-USA Pesticide Application Technology Cooperative Laboratory Nanjing 210014China

Application of Unmanned Aircraft Systems(UAS)for plant protection is becoming a common tool in agricultural field *** avoid shortcomings of intrusive flowrate sensors including poor measurement accuracy and poor anti-vibration ability,a non-intrusive flowrate measurement and monitoring system of plant-protection UAS was developed based on pump voice signal *** is mainly composed of STM32 processor,microphone and signal-conditioning *** collecting and analyzing the voice signal of the pump in the UAS,the monitoring system will output the real-time values of spraying flowrate and *** extraction model was developed to determine operation status and primary frequency of the pump based on voice signal ***-time spray flowrate can be determined from the real-time extracted primary frequency and the fitted correlation formulas of spraying flowrate under outlet area and pump primary *** flowrate correlation equation of one certain pump from 4-rotor UAS 3WQFTX-1011S was obtained,the max deviation rate of fitted spray flowrate was only 2.8%.In primary frequency extraction test,the error rate of primary frequency extraction was less than 1%.In the 4-rotor UAS flight tests:the max deviation of operating starting/end point was only 0.7 s and the max deviation of extracted total operating time was only 0.8 s;the deviation of extracted spray flowrate was less than 2%,and the max deviation rate of total spray amount was 3.2%.This research could be used as a guidance for plant-protection UAS non-intrusive flowrate measurement and monitoring.

关键词： plant protection UAS voice signal analysis non-intrusive flowrate measurement monitoring system

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