Improving olive mechanical harvesting using appropriate natural frequency

Alzoheiry, A.; GHONİMY, Mohamed; Rahman, Eid Abd El; Abdelwahab, Ossama M.M.; Hassan, Ahmed M.

doi:10.4081/jae.2020.1057

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…Increasing PTO shaft speed, vibration amplitude and vertical height clamp position decreased operational cost that is may be due to the increase in machine productivity under the all-mentioned parameters. This is in agreement with Alzoheiry, et al (2020) who stated that the good performance of olive mechanical harvesting by shaking depends on the suitable values of vibrator operating parameters (frequency and amplitude). CONCLUSION The main objective of the present investigation was to manufacture and evaluate the performance of a local tractormounted machine from local material to be used for harvesting olive.…”

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confidence: 92%

“…The results from these models indicated that the FN values were 33.9, 31.9, and 28.0 Hz for the fully mature stage, half-ripe olive, and full-ripe olive respectively. Branch vibrator was operated at three levels of frequency and 3 levels of amplitude at a vibration time of 10 s ( Alzoheiry, et al, 2020). However, to understand the effects of mechanical harvesting on olive productivity, further research is required.…”

Section: Introductionmentioning

confidence: 99%

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Manufacturing and performance evaluation of a tractor-mounted olive harvesting machine

Altermzey

2020

Egyptian Journal of Agricultural Research

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The main objective of the present investigation was to manufacture and evaluate the performance of a tractormounted machine for harvesting olive. The performance of the manufactured harvesting machine was experimentally studied under four different PTO speeds (300, 450, 600 and 750 rpm), three different vibration amplitudes (10, 15 and 20 cm) and three different vertical height clamp positions on the tree (0.5, 1.0 and 1.5 m). Evaluation of the manufactured machine was carried out taking into consideration harvester productivity, harvesting losses, specific energy and operational cost. The experimental results revealed that harvester productivity (26.7 tree/h), harvesting losses (1.8 %), specific energy (0.674 kW.h/tree) and operational cost (3.152 L.E./tree (343.64 L.E./fed)) were found using the manufactured harvesting machine at 300 rpm PTO speed, 15 cm vibration amplitude and 1.0 m vertical height clamp position on the tree.

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confidence: 92%

Section: Introductionmentioning

confidence: 99%

Manufacturing and performance evaluation of a tractor-mounted olive harvesting machine

Altermzey

2020

Egyptian Journal of Agricultural Research

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“…According to recent research, fruit trees that are shaken may experience very large damping losses, depending on how far up the shaker is linked to the tree trunk (Horvath and Sitkei, 2001;Alzoheiry et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Power Requirements for Olive Mechanical Harvesting Using Trunk Shaker

Ghonimy,

Ibrahim,

Helmy

et al. 2024

Preprint

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A mathematical analysis was done to predict the power requirements of the olive trunk shaker. The predicted required power of the olive trunk shaker is affected by shaking displacement, fruit detachment force, fruit mass, stem length, damping ratio, unbalanced mass of tree shaker, and exciting shaking frequency. The Olive trunk shaker was tested in the field at three attachment heights, 400, 600, and 800 mm, and six levels of olive trunk diameter: 78, 84, 101, 143, 158, and 186 mm. The results showed that the theoretical shaking power was 12.8 kW while the actual required shaking power ranged between 8.4 to 16.7 kW, with an average of 12.7 kW due to differences in tree trunk diameters and different attachment heights. Multiple regression using the least square method was used to find a statistical relation between the theoretical equation and the actual required power as a function of the clamp attachment height and the trunk diameter. The regression coefficient of the predicted equation was 91.2% for attachment height values between 400 and 800 mm and tree trunk diameter values between 78 and 186mm, and the mean absolute error of the prediction model was 0.5174 kW.

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“…Manzanilla was inferior to those picked manually. Alzoheiry et al (2020) estimated the natural frequency (FN) of olive fruit stem system using one and two degrees of freedom models. Their result indicated that the FN value of full mature stage was 33.9 Hz, half-ripe olive was 31.9 Hz, and 28.0 Hz for full-ripe olive.…”

Section: Introductionmentioning

confidence: 99%

Development of Olive Harvesting Machine by Shaking

GHONİMY

Younis

GHONİEM³

2022

Turkish Journal of Agricultural Engineering Research

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Olive harvesting machine by shaking was developed and fabricated using local materials with required specifications. The developed elements were frame and hitch, gear assembly, input and transmission shafts, vibrating unit, connecting rod, limb clamp, and transmission system. This research work aimed to evaluate the developed olive harvester capable to perform harvesting operation in the proper time using the tractor as the available economic source of power. Measurements covered the properties of olive fruit, stem, and limb for five olive varieties: Agizi, Manzanillo, Picholine, Kalamata and Arbiquen. The developed harvester was tested at three levels of frequency; 3.3, 6.7, and 10 Hz, four levels of stroke; 40, 80, 120, and 160 mm, and three levels of shaking time 60, 120 and 180 s. Results indicated that the effective range to attach the clamp on the olive limb were 30 to 40% of limb length. The average value of the maximum bending stress affecting the limb and limb deflection were 16.5 MPa and 196.6 mm respectively. In addition, results have provided the suitability of the developed shaker to harvest olive fruit. The suitability of the developed machine was judged through the fruit removal percentage. The values of performance parameters of olive harvester were 10 Hz optimum shaking frequency, 120 mm of stroke, and 120 s of shaking time.

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Improving olive mechanical harvesting using appropriate natural frequency

Cited by 7 publications

References 18 publications

Manufacturing and performance evaluation of a tractor-mounted olive harvesting machine

Manufacturing and performance evaluation of a tractor-mounted olive harvesting machine

Power Requirements for Olive Mechanical Harvesting Using Trunk Shaker

Development of Olive Harvesting Machine by Shaking

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