Vibration–Collision Coupling Modeling in Grape Clusters for Non-Damage Harvesting Operations

Baocheng Xu, Jizhan Liu (), Yucheng Jin, Kaiyu Yang, Shengyi Zhao and Yun Peng
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Baocheng Xu: School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Jizhan Liu: School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Yucheng Jin: School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Kaiyu Yang: Yinzhou Agricultural Mechanization Extension Station, Yinzhou 315100, China
Shengyi Zhao: School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Yun Peng: School of Electronic Engineering, Changzhou College of Information Technology, Changzhou 213164, China

Agriculture, 2025, vol. 15, issue 2, 1-24

Abstract: In the table grape production process, issues such as berry detachment and damage caused by cluster vibrations and berry collisions are significant challenges. To investigate the underlying mechanisms and dynamics of these phenomena, a vibration–collision coupling method for table grape clusters was developed. Based on the vibration model of a grape cluster, the smallest vibration–collision coupling unit—referred to as the dual-twig–berry system—was proposed. This system was described using a “(viscoelastic hinge)–(rigid bar)–(flexible sphere)–(viscoelastic link)” model. The dynamic vibration–collision coupling equation of the dual-twig–berry system was derived by incorporating expressions for the viscoelastic vibration of the twigs, viscoelastic collision of the berries, and a generalized collision force (based on the Kelvin model) into the framework of the Lagrange equation. A computational-simulation method for solving this dynamic vibration–collision coupling equation was also developed. The simulation results revealed that the vibration–collision coupling pattern exhibited a shorter vibration period, smaller vibration amplitude, and higher vibration frequency compared to the vibration pattern without coupling. A reduction in vibration amplitude mitigates berry detachment caused by excessive instantaneous loads. However, the increase in vibration frequency exacerbates berry detachment due to fatigue and causes varying degrees of berry damage. This study provides a theoretical foundation for understanding the mechanisms of berry detachment and damage, offering valuable insights for mitigating these issues in table grape production.

Keywords: grape clusters; harvest and postharvest handling; vibration–collision coupling; dynamics model (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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