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On-Line Detection Method and Device for Moisture Content Measurement of Bales in a Square Baler

文献类型： 外文期刊

作者： Liu, Huaiyu 1 ; Meng, Zhijun 1 ; Zhang, Anqi 1 ; Cong, Yue 1 ; An, Xiaofei 1 ; Fu, Weiqiang 1 ; Wu, Guangwei 1 ; Yin, Yanxin 1 ; Jin, Chengqian 2 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Intelligent Equipment Res Ctr, Beijing 100097, Peoples R China

2.Minist Agr & Rural Affairs, Nanjing Res Inst Agr Mechanizat, Nanjing 210014, Peoples R China

关键词： square baler; straw; moisture content; capacitance; backpropagation neural network

期刊名称：AGRICULTURE-BASEL （ 影响因子：3.408； 五年影响因子：3.459 ）

ISSN：

年卷期： 2022 年 12 卷 8 期

页码：

收录情况： SCI

摘要： Aiming to address the problems of low detection accuracy and poor stability due to the weak anti-interference ability of the bridge circuit and operational amplifier circuit, and the influence on the capacitance of the bulk density and temperature of the straw bale, an on-line detection device for the moisture content of straw bales in a square baler was developed based on the capacitance method. The device integrates a capacitance sensor, pressure sensor, and temperature sensor. The optimal structure size of the capacitor plate was determined through the simulation test of the capacitor sensor plate structure. A moisture content monitoring system based on the MATLAB language is built, and the moisture content detection model was constructed based on the backpropagation neural network (BPNN) algorithm. Finally, a test bench for a square baling machine was designed, and a performance verification test of the moisture content detection device was carried out. The simulation results of the capacitor plate show that when the length, width, and spacing of the capacitor plate are 148.6, 47.7, and 5.1 mm, respectively, the detection sensitivity of the capacitor plate is the highest. The modeling results show that the R-2, RMSE, and RPD of the BPNN model are 0.986, 0.008998, and 5.99, respectively, with solid data fitting ability and high prediction accuracy. The bench test results show that for the samples having moisture content between 13.1 and 28.04%, the coefficient of determination R-2 of the fitting curve between the predicted value of moisture content and the actual value is 0.949. The relative error range of the predicted value of moisture content is -6.51-8.66%, and the absolute error range is -1.63-1.72%. The on-line detection device for moisture content of straw bales has good accuracy and stability.

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