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Dynamic Mechanical Response of Florida Citrus as Related to Peel Maturation

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  036133,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.15413)
Authors:   William M. Miller, Sherrie Buchanon
Keywords:   Firmness, impact, impulse, resonance

A 2-year study was undertaken to determine the mechanical response of citrus subjected to impact and vibration testing. Indian River white grapefruit on two rootstocks and various specialty varieties, obtained at varying states of maturity, were selected for testing. Grapefruit testing was conducted bi-weekly over a 6 month period. Separate test stands were designed to accommodate an impact modal hammer device and 27 N vibrational shaker. Accelerometer and force data were collected through an A/D card sampling at 10 kHz (impact) and 20 kHz (vibration) using LabView data acquisition software. Impact-related features extracted and analyzed included peak force, delay transmission time and force ratio. Resonant frequency and peak transmissibility were obtained from the vibration tests. Internal damping calculations were made and compared to a mathematical model and related to time of maturity for the citrus varieties evaluated.

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