Abstract The coffee industry stands out worldwide due to its socioeconomic importance, acting directly or indirectly in the most diverse sectors. With this, new technologies and several harvester models have emerged. These harvesters have regulations that can influence the efficiency of harvesting, the selectivity of fruits and the preservation of the crop. In this way, the understanding of the behavior of harvester components and their dynamic relationship with coffee are essential for mechanical harvesting management and for developing new products. The objective of this work was to obtain the coffee tree branch displacement (in terms of frequency and amplitude of vibration) through instrumentation and signal processing techniques. For this, a low cost system was developed, consisting of an Arduino open source electronic prototyping platform and an accelerometer. The acceleration signals were collected and processed via MatLab. The results showed the complete two-dimensional displacement performed by the coffee tree branches for different harvester settings during the mechanical coffee harvesting. From the vibration displacements of the branches it is possible to unveil the dynamic interaction between machine and coffee tree, contributing to the management of mechanical coffee harvesting and to the development of new vibration harvesting systems.

中文翻译：

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机械收获过程中咖啡树枝的动态行为

摘要 咖啡产业因其社会经济重要性而在世界范围内脱颖而出，直接或间接地在最多样化的部门发挥作用。因此，出现了新技术和几种收割机模型。这些收割机的法规会影响收割效率、水果的选择性和作物的保存。这样，了解收割机组件的行为及其与咖啡的动态关系对于机械收割管理和开发新产品至关重要。这项工作的目的是通过仪器和信号处理技术获得咖啡树枝的位移（在振动频率和振幅方面）。为此，开发了一个低成本系统，由一个 Arduino 开源电子原型平台和一个加速度计组成。通过 MatLab 收集和处理加速度信号。结果显示，在机械咖啡收获过程中，咖啡树枝在不同收获机设置下执行的完整二维位移。从树枝的振动位移可以揭示机器和咖啡树之间的动态相互作用，有助于机械咖啡收获的管理和新振动收获系统的开发。