Article ID Journal Published Year Pages File Type
84255 Computers and Electronics in Agriculture 2014 11 Pages PDF
Abstract

•Geometric model of fruit-peduncle system (Coffea arabica L. var. Colombia).•Mechanical properties of fruit-peduncle system (Coffea arabica L. var. Colombia).•Finite element modal analysis of a coffee fruit-peduncle system.•Results: Elastic properties and validation of the geometric model.•Results: Identification of natural frequencies and modes of vibration.

This study shows a heuristic process for identification of natural frequencies and modes of vibration of the fruit-peduncle system of Coffea arabica L. var. Colombia by means of a modal analysis. From experimental data, the real topology of the fruit-peduncle system was approached with a proposed theoretical model. The geometric models can be generated in any ripening stage and these showed a good agreement when these are compared with real coffee fruits. The elastic properties of the fruit were determined from a sensitive analysis using experimental data of firmness for each ripening stage. It was observed that with the increase in the days of ripening, the fruit loses its elastic capacity. From a finite element modal analysis, the natural frequencies were identified for the fruit-peduncle system and the first 20 modes of vibration were selected and analyzed. A dynamic criterion was established to identify and define frequency intervals in which the modes of vibration produce rotations at the fruit-pedicel interface. The results shows that the modes associated to natural frequencies in specific intervals probably facilitate the separation between the interface fruit-pedicel for the ripe stage but these intervals are different from other ripening stages. The heuristic process developed in this study may be extrapolated to other varieties of coffee.

Related Topics
Physical Sciences and Engineering Computer Science Computer Science Applications
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