Aiming at the problem that the existing combine harvester loss monitoring technology is not suitable for collecting and processing oil sunflower grain loss signals, a cleaning loss monitoring device suitable for oil sunflower combine harvester is designed. The device is mainly composed of polyvinylidene fluoride (PVDF) piezoelectric film, signal acquisition and processing circuit board and installation adjustment device, which realizes real-time monitoring of oil sunflower cleaning loss rate. The performance of the filter is simulated and analyzed by Multisim software. The results show that the gain of the filter is flat and fixed at 1 in the non-stop band, and the attenuation effect on 50 Hz interference signals is remarkable, which can ensure the accuracy and integrity of the collected signals. A wavelet transform adaptive filtering (DWT-LMS) algorithm based on STM32 series microcontroller is designed. Simulation comparison between the proposed algorithm and the traditional least mean square (LMS) algorithm is carried out by Matlab software. The results show that the DWT-LMS algorithm has a better suppression effect on the noise in the signal. The threshold ranges corresponding to oil sunflower seeds and cleaning impurities (broken petioles, broken sunflower discs and broken leaves) are determined through bench tests, and the reliability of the monitoring device under different durations is verified. The results show that the maximum monitoring error of the cleaning loss monitoring device is 9.09%, the average monitoring error is about 7.59%, and the average loss rate is about 0.63 g/s. A theoretical basis can be provided for the optimization of the cleaning system of oil sunflower combine harvesters.
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