Effect of leaves in the dynamic response of olive tree branches and their computational model

Sola-Guirado, Rafael R.; Luque-Mohedano, Rafael; Tombesi, Sergio; Blanco-Roldán, Gregorio L.

doi:10.1016/j.compag.2022.107490

Cited by 7 publications

(1 citation statement)

References 26 publications

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“…Figure 8 states that for a same input vibration (frequency, eccentricity, mass, time), different values of transmissibility are reported depending on the type of branch (with similar geometry and mass). This points out that each type of branch has a different structure and properties, the most relevant of which are probably the stiffness and damping (Sola-Guirado et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Configurable trunk shaker for the mechanical harvesting of different fruit branches

Sola-Guirado

Sanchez-Cachinero

Tombesi

2023

Journal of Vibration and Control

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Trunk shakers perform a forced vibration that should be set according to tree species and architecture to efficiently detach fruits. However, manufacturing companies produce designs that are poorly customisable according to different trees. This work presents a prototype that is configurable in amplitude and frequency of vibration, which has been developed to generate the different vibration patterns required by various fruit trees. To study the feasibility of the developed technology, we built a test bench with a post, to which we fixed olive, almond and orange tree branches, and tested different configurations of the machine (frequencies from 12.25 to 20.75 Hz and eccentricities from 58 to 86 mm). Acceleration values were recorded at different points: the trunk shaker, the post in the grip, the top of the post, and in each branch. We recorded a large loss of acceleration transmissibility between the shaker and the post (20%–60%) due to existing frictions that dissipate energy through heat loss. There is a non-linear increase between vibration frequency and the resultant acceleration value recorded, as well as with increasing eccentricity. The shaker was able to provide a different vibration pattern in each configuration, affecting the transmission of vibration in each of the branches studied, for which mean acceleration transmissibility ranged between 82% (almond), 104% (olive) and 136% (orange).

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Section: Discussionmentioning

confidence: 99%