Vibration Shapes Identification Applying Eulerian Video Magnification on Coffee Fruits to Study the Selective Harvesting

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F20%3A00603734" target="_blank" >RIV/68081723:_____/20:00603734 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1109/me49197.2020.9286641" target="_blank" >http://dx.doi.org/10.1109/me49197.2020.9286641</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/me49197.2020.9286641" target="_blank" >10.1109/me49197.2020.9286641</a>

Result language

angličtina

Original language name

Vibration Shapes Identification Applying Eulerian Video Magnification on Coffee Fruits to Study the Selective Harvesting

Original language description

In the last few years, Colombian coffee production has decreased by different economic factors related to the increment of costs in manual selective harvest operations. Consequently, an interest has arisen for studying selective harvesting methods based on mechanical vibrations in seeking for an alternative technology. In this sense, it is mainly essential to understand the dynamic behavior of the coffee fruits at different ripening stages. In this study, an experiment was proposed to observe the vibration shapes of coffee fruits (Coffea arabica var. Castillo) in defined frequency intervals. The ripening stages were categorized by a strategy based on color measurements in the CIELab space. Four ripening stages were determined from color data taken of 84 fruits, which allowed the development of the dynamic experiments over classified fruits. The dynamic excitation was applied to the coffee fruits between 0-1000 Hz in which ripe fruits evidenced higher vibration amplitudes in specific frequency intervals. These motions cannot be visualized from a normal video-camera (60 Fps). Therefore, a high-speed camera (Chronos 1.4) was used to record these during harmonic excitation. Eulerian video magnification technique was applied to the video-based measurements to visualize the amplified vibration shapes. The magnified motions were contrasted with vibrometry measurements and a piezo sensor attached to the fruit pedicel. Results show that the ripe fruit can vibrate with higher amplitudes in comparison with the other ripening stages, this information could be used to harvest selectively only ripe fruits.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20302 - Applied mechanics

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

PROCEEDINGS OF THE 2020 19TH INTERNATIONAL CONFERENCE ON MECHATRONICS MECHATRONIKA (ME)

ISBN

978-1-7281-5602-6

ISSN

—

e-ISSN

—

Number of pages

8

Pages from-to

242-249

Publisher name

IEEE

Place of publication

New York

Event location

ELECTR NETWORK

Event date

Dec 2, 2020

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000662155700043