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• W4320084978 abstract "The problem of breakage and shedding in the mechanical harvesting of edible grapes has not been fully studied. Particularly, the responsiveness and shedding of berries caused by excited vibrations when the stem is sheared. This work combines modal analysis and swept frequency analysis to study the oscillation response and critical shedding characteristics of excited grape systems. First, a dynamic grape main stem-split stem-berry plane double pendulum model is established based on shedding theory, and the theoretical angular velocity of berry swing is deduced. Then, the berry separation and shedding processes are accurately simulated by a simplified multi-berry model that eliminates interference and penetration effects. The modal analysis shows that the berries exhibited multidirectional and multistate disordered swings and rotations at different frequencies. Finally, the critical shedding parameters, including the acceleration, velocity, displacement, stress and shedding frequency of the dynamic responses of the berries in the simulations and picking experiments are compared. The results show that the dynamic response trends of the simulation and picking experiments are consistent, and the berries fall off when the amplitude is 49.88 mm and the frequency is approximately 4 Hz. Therefore, this study provides theoretical parameters for optimising the picking mechanism." @default.
• W4320084978 created "2023-02-12" @default.
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• W4320084978 date "2023-03-01" @default.
• W4320084978 modified "2023-10-18" @default.
• W4320084978 title "Vibration analysis and experimental study of the effects of mechanised grape picking on the fruit–stem system" @default.
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• W4320084978 doi "https://doi.org/10.1016/j.biosystemseng.2023.01.019" @default.
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