Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing

Determinação das propriedades modais do sistema fruto-pedúnculo do café por vídeos de alta velocidade e processamento de imagens digitais

dc.creatorVillibor, Geice Paula
dc.creatorSantos, Fábio Lúcio
dc.creatorQueiroz, Daniel Marçal de
dc.creatorKhoury Júnior, Joseph Kalil
dc.creatorPinto, Francisco de Assis de Carvalho
dc.date2018-08-30T16:49:28Z
dc.date2018-08-30T16:49:28Z
dc.date2016-01
dc.date.accessioned2023-09-28T20:08:42Z
dc.date.available2023-09-28T20:08:42Z
dc.identifierVILLIBOR, G. P. et al. Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing. Acta Scientiarum. Technology, Maringá, v. 38, n. 1, p. 41-48, Jan./Mar. 2016.
dc.identifierhttp://repositorio.ufla.br/jspui/handle/1/30276
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9045533
dc.descriptionDetachment of coffee fruit is usually accomplished by means of mechanical impacts and vibrations applied to the plant. Modal properties of the coffee fruit-stem system represent important information for efficient and selective harvesting. This study aimed to determine the modal parameters of the coffee fruit-stem system, such as natural frequency and damping coefficient, using high speed digital videos. With image processing techniques, it was obtained the resulting displacement of the system subjected to an impulse. The modal parameters were determined by the logarithmic decrement method, considering the system as underdamped. The use of high-speed video and digital image processing techniques allowed the simple and reliable determination of modal parameters of the coffee fruit-stem system. Natural frequencies for the coffee fruit-stem system were 11.62 and 13.29 Hz; the damping coefficient was 0.0253 and 0.029 N s m-1, and the equivalent stiffness was 8.61 and 7.09 N m-1 for red and green ripening stages, respectively. It was found overlap of resonance bands, between the ripening stages red and green, hindering the selective mechanical detachment in the first natural frequency range of the coffee fruit-stem system.
dc.formatapplication/pdf
dc.languageen_US
dc.publisherUniversidade Estadual de Maringá
dc.rightsacesso aberto
dc.rightshttp://creativecommons.org/licenses/by/4.0/
dc.sourceActa Scientiarum. Technology
dc.subjectImage segmentation
dc.subjectMechanical harvesting
dc.subjectMechanical vibrations
dc.subjectCoffee - Harvesting
dc.subjectSegmentação de imagens
dc.subjectColheita mecânica
dc.subjectVibrações mecânicas
dc.subjectCafé - Colheita
dc.titleDetermination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing
dc.titleDeterminação das propriedades modais do sistema fruto-pedúnculo do café por vídeos de alta velocidade e processamento de imagens digitais
dc.typeArtigo


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