Vibration dynamics of pruned canopy: Investigating the impact of excitation trajectories on fruit-tree system response

IF 5.3 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Biosystems Engineering Pub Date : 2025-07-21 DOI:10.1016/j.biosystemseng.2025.104236

Jishun Liu , Xintao Han , Chanda Mulongoti , Zenghong Ma , Xiaohua Yao , Qiyin Zhuang , Sergio Castro-García , Xiaoqiang Du

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引用次数: 0

Abstract

Vibratory harvesting efficiency for forest fruits like Camellia oleifera (edible-oil tree) depends on machine vibration parameters and tree biomechanics, particularly tree structure. This study aimed to improve fruit removal and identify optimal tree structures for mechanised harvesting. A dynamic branch-fruit model based on an epitrochoid trajectory identified excitation frequency and trajectory amplitude as key detachment factors. Box-Behnken experiments determined the optimal vibration response at 7 Hz and 90 mm amplitude, considering branch angle and length. A parallel mechanism-driven canopy shaker was designed for field trials. The C. oleifera morphology was modified by pruning to assess vibration response and attenuation across canopies with varying branch angles. Branches inclined between 30° and 60° exhibited the highest vibration acceleration (26.5 m s⁻²), while those between 0° and 30° showed the lowest (13.8 m s⁻²). Vibration attenuation was the highest in 0°–30° branches and the lowest in 60°–90° branches. Based on these results and conventional practices, an optimal pruning scheme was developed to facilitate harvesting without compromising yield. Field harvesting trials achieved an average fruit removal rate of 75.1 % and an average bud shedding rate of 11.6 %.

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修剪后树冠的振动动力学：研究激励轨迹对果树系统响应的影响

油茶（Camellia oleifera）等森林水果的振动采伐效率取决于机器振动参数和树木的生物力学，特别是树木的结构。本研究的目的是提高果实的去除和确定最佳的树结构为机械化采收。基于表廓线轨迹的动态枝果模型将激励频率和轨迹幅值作为分离的关键因素。考虑分支角度和长度，Box-Behnken实验确定了7 Hz和90 mm振幅下的最佳振动响应。设计了一种并联机构驱动的振动筛，用于现场试验。通过剪枝改变油松形态，评估不同枝角下树冠间的振动响应和衰减。倾角在30°~ 60°之间的树枝振动加速度最大，为26.5 m s−2，倾角在0°~ 30°之间的树枝振动加速度最小，为13.8 m s−2。0°~ 30°枝条的振动衰减最大，60°~ 90°枝条的振动衰减最小。根据这些结果和传统做法，制定了最佳修剪方案，以促进收获而不影响产量。田间采收试验平均脱果率75.1%，平均脱芽率11.6%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biosystems Engineering 农林科学-农业工程

CiteScore

10.60

自引率

7.80%

发文量

239

审稿时长

53 days

期刊介绍： Biosystems Engineering publishes research in engineering and the physical sciences that represent advances in understanding or modelling of the performance of biological systems for sustainable developments in land use and the environment, agriculture and amenity, bioproduction processes and the food chain. The subject matter of the journal reflects the wide range and interdisciplinary nature of research in engineering for biological systems.