基于摇振收获设备的核桃树复杂分枝特性研究OA

In order to determine the excitation parameters of trunk rocking harvest of large fruit trees,the resonance characteristics of complex branches of large fruit trees were explored.Taking walnut trees in southern Xinjiang as the re-search object,the resonance frequency sweep detection test of walnut trees was carried out by using the self-developed trunk shaking harvesting equipment.The time-acceleration response amplitude curve and excitation frequency-accelera-tion response amplitude curve of sample tree detection point were obtained and analyzed.It was found that the branch growth direction of walnut trees was less affected by sweep vibration.The resonance frequency of the main branch on the complex branch of walnut tree is consistent with that of its upper branch.The maximum variance of the resonance fre-quency at the detection point of the complex branch of the sample tree is 0.038 Hz,which is less than 0.05 Hz.The length-diameter ratio of complex branches of walnut trees was positively correlated with the amplitude of branch resonance response.The correlation coefficient between the length-diameter ratio of complex branches of sample trees and the am-plitude of Z-axis resonance response was 0.455,which was close positive correlation.This study can lay the foundation for determining the excitation frequency of large fruit tree trunk vibration harvesting.