Abstract
When the cylinder of rice combine harvester is threshing, the interaction between the fed rice stalk and the threshing teeth makes the cylinder subject to a large vibration shock. Undergoing the influence of this shock, the vibration response of threshing cylinder is non-stationary. In view of the above problems, this paper aims to accurately characterize the harvesting state of the threshing cylinder and extract the impact components caused by the winding of rice stalks. First, the constrained modes and main response harmonics of the threshing cylinder during operation are solved by modal harmonic response analysis. The time-frequency domain analysis was carried out on the threshing cylinder vibration signal undergoing field working conditions. Combined with spectral envelope and spectral kurtosis analysis methods, the main shock frequencies during the threshing process of the cylinder are analyzed. The results show that the main response frequency of the threshing cylinder under no-load state is the response frequency of 14 Hz, but the main frequency component of the threshing cylinder during the harvesting process is 80 Hz. Comparing the results of harmonic response analysis, it can be concluded that the winding of rice stalks will affect the vibration response of the threshing cylinder. Rice threshing state prediction with harmonic response provides a new method for the follow-up threshing cylinder condition monitoring and fault diagnosis.
Published Version
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