Determining Adequate Vibration Frequency, Amplitude, and Time for Mechanical Harvesting of Fresh Mandarins

Ortíz, Coral; Torregrosa, A.

doi:10.13031/2013.42581

Cited by 31 publications

(32 citation statements)

References 9 publications

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“…A laboratory unidirectional vibratory device was constructed and used to vibrate the mandarin branches. It was based on the one developed by [12] and it consist in a connecting rod converted the rotational motion from an electric motor) into linear motion to vibrate the branch ( Figure 1). A frequency converter was used to vary the vibration frequency from 4.5 to 40 Hz.…”

Section: Methodsmentioning

confidence: 99%

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Laboratory Device to Assess the Effect of Mechanical Thinning of Flower Buds, Flowers and Fruitlets Related to Fruitlet Developing Stage

et al. 2019

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Mandarin thinning is done by hand, increasing labor costs and raising total crop production costs. Mechanical thinning has been tested in peaches and other fruits. To achieve the maximum efficiency thinning has to be applied at a specific stage of vegetative development. In this research study, the mechanical thinning of 'Clemenrubi' mandarin branches during the different fruit development stages have been assessed using a vibratory laboratory device (amplitudes 0.015 and 0.030 m and frequencies 34.8 and 37.8 Hz). Branches with flower buds, flowers, small green fruits, and medium green fruits were tested for 12 weeks, in two different seasons. It was possible to mechanically detach flower buds, flowers, and green fruits using different combinations of amplitudes and frequencies.Removal percentage decreased when increasing retention traction force, according to a logarithmic regression model. A significant increment in equatorial diameter and retention traction force was registered when the fruit setting was finishing, while mass had a similar development with a week delay. During fruit setting (weeks 5, 6, and 7) removal percentage was higher, while the retention force was very low. The first weeks just after the natural thinning could be considered the adequate time for a mechanical thinning operation.

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Section: Methodsmentioning

confidence: 99%

“…Ortiz and Torregrosa [12] used a laboratory unidirectional vibratory device to vibrate mandarin branches in order to assess the adequate frequency, amplitude, and time for mechanical harvest, reducing the experimental field non-controlled factors.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Device to Assess the Effect of Mechanical Thinning of Flower Buds, Flowers and Fruitlets Related to Fruitlet Developing Stage

et al. 2019

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“…The most suitable vibrational parameters have been studied, and the possible damages to the trees bark, leaves, and trunks have also been analyzed, finding that if the duration of the vibration is not excessive, there are not, usually, any problems observed on the trees. Low frequencies (5)(6)(7)(8)(9)(10) combined with high amplitudes, more than 0.1 m, are highly effective in fruit detaching with low defoliation. However, this can only be applied to trees with long trunks, attaching the shaker at a high point.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Harvesting of Ornamental Citrus Trees in Valencia, Spain

et al. 2019

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Citrus trees are used as ornamental plants in several Spanish cities. They give a nice color to the streets and a nice scent in the flowering stage, but when the fruits fall, they dirty the roads and pavements, and can cause accidents; this is the reason why gardeners must detach and collect the fruits. This task is being done manually, but it is quite inefficient and expensive. In this study, three types of machines have been used to mechanize this task: a trunk shaker with umbrella, a trunk shaker hitched to an orchard tractor, and an experimental smaller sized shaker that can be attached to small and pedestrian tractors. The shaking patterns used by each equipment, detachment percentages, mobility constraints, and tree damage have been measured, and reduction costs have been estimated. After three years of study, the system has been fully accepted by both gardeners and citizens.

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“…However, as the frequency increased, so did the defoliation. Ortiz et al (2013) shook citrus branches in the laboratory to analyse the effect of the frequency, amplitude and shaking time on detachment. They noticed that the point of detachment depended on the stage of maturity of the fruit, the variety and the traction force.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the detachment of citrus fruits by vibration using artificial vision

Torregrosa

Albert

Aleixos

et al. 2014

Biosystems Engineering

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ElsevierAlbert Gil, FE.; Aleixos Borrás, MN.; Torregrosa Mira, A.; Ortiz Sánchez, MC.; Blasco Ivars, J. (2014). Analysis of the detachment of citrus fruits by vibration using artificial vision. Biosystems Engineering. 119:1-12. doi:10.1016/j.biosystemseng.2013.12.010. Analysis of the detachment of citrus fruits by vibration using artificial vision AbstractThe vibratory behaviour of citrus fruits is studied using slow-motion cameras in order to gain a better understanding of the parameters involved in fruit detachment when mechanical harvesting is done using shakers. Single citrus fruits with a small portion of stem were vibrated using strokes from 60 mm to 180 mm and frequencies from 3 Hz to 18 Hz. The movement was recorded at 300 fps and the main parameters considered for fruit detachment were determined through the analysis of the video sequences. Image processing algorithms created for this purpose were applied to the automated estimation of the centroid of the fruit, the angle of the stem-pistil axis, and the position of some selected points in the fruit in each frame of the video sequences to obtain dynamic parameters such as the position, speed and acceleration of the fruit during the movement until it is detached. The signals obtained from the image processing were filtered, providing results in accordance with the calibration systems. In general, results suggest that the inertial forces transmitted to the fruit were lower than the tensile forces required to detach the fruit by pulling it in the stem-pistil direction. The largest peaks were observed using long strokes that required fewer cycles for detachment. On the other hand, short strokes combined with high frequencies needed more cycles, and thus a fatigue phenomenon was present. Short strokes and low frequencies were unable to detach some fruit.

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Determining Adequate Vibration Frequency, Amplitude, and Time for Mechanical Harvesting of Fresh Mandarins

Abstract: ABSTRACT. Mechanical citrus harvesting systems in

Cited by 31 publications

References 9 publications

Laboratory Device to Assess the Effect of Mechanical Thinning of Flower Buds, Flowers and Fruitlets Related to Fruitlet Developing Stage

Laboratory Device to Assess the Effect of Mechanical Thinning of Flower Buds, Flowers and Fruitlets Related to Fruitlet Developing Stage

Mechanical Harvesting of Ornamental Citrus Trees in Valencia, Spain

Analysis of the detachment of citrus fruits by vibration using artificial vision

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