The contribution of fruit and leaves to the dynamic response of secondary branches of orange trees
Autor
Castro García, Sergio
Aragón-Rodríguez, Fernando
Arias Calderón, Rocío
Sola Guirado, Rafael Rubén
Gil Ribes, Jesús
Editor
ElsevierFecha
2020Materia
VibrationMechanical harvesting
acceleration transmission
tree dynamic
damping
METS:
Mostrar el registro METSPREMIS:
Mostrar el registro PREMISMetadatos
Mostrar el registro completo del ítemResumen
The current commercial technologies for mass harvesting fruit are based on the
application of forced vibration to the tree, which is transmitted to the fruits causing their
detachment. The dynamic behaviour of the plant under forced vibration is of special
interest to improve the design and use of the machinery. The objective of this work is to
determine the effect of fruit and leaves on the dynamic response of the citrus branch.
In this study, 22 secondary branches of 'Valencia' sweet orange trees were tested by
applying forced vibration and measuring the response of the branches with triaxial
accelerometers. The branches were tested in three stages: in-fruit branch, out-of-fruit
branch and out-of-leaf branch. Three natural frequency values were identified in the
branches, and were established as 2, 7 and 11 Hz. Acceleration transmissibility along
the branch decreased as vibration frequency increased. The acceleration transmission
values were highest for the first natural frequency, were up to 1.3-fold in the out-of-fruit
branch and up to 4.6-fold in the out-of-leaf branch. The presence of fruits on the branch
did not modify the branch natural frequency values but did slightly reduce the values of
acceleration transmissibility. However, the presence of leaves on the branches had a
double effect, reducing the first natural frequency and drastically damping acceleration
transmissibility