关键词: 隔膜泵, 声信号处理, 小波分解, 施药量监测

Abstract:  Drug dosage monitoring technology was the cornerstone of precise drug application and variable drug application and an important guarantee for realizing Chinas ecological agriculture. In view of the problems of poor accuracy and short life of the current embedded dose monitoring equipment, this paper proposed a nonembedded diaphragm pump dose monitoring method based on the acoustic signal. Firstly, the working state and speed information of the diaphragm pump was extracted by using the algorithm of wavelet transform and shortterm energy. Then the system application amount was obtained by constructing a mathematical model between the speed and flow rate of the diaphragm pump. Finally, the experimental verification was carried out. The results showed that the shorttime energy algorithm could extract the vibration signal of the pump to identify the switch state of the diaphragm pump. The maximum time deviation for identification was 0.41 s. The acoustic signal processing method of wavelet transform had a high precision in extracting the working speed of the diaphragm pump, and the maximum extraction error was 2.8%. The error of the diaphragm pump dose monitoring method based on the acoustic signal was within 5%.

Key words: Diaphragm pump, acoustic signal processing, wavelet transformation, dosage monitoring