Study of force distribution in the citrus tree canopy during harvest using a continuous canopy shaker

Savary, S. K. J. U.; Ehsani, Reza; Salyani, M.; Hebel, Martin; Bora, Ganesh C.

doi:10.1016/j.compag.2011.01.005

Cited by 29 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Harvesting trial using canopy shaker had indicated the fruit removal efficiency ranges between 80 and 90%. Analysis of the force and acceleration during the harvest in the tree canopy might give some insightful information for understanding and resolving the raised concerns [24]. Figure 1(a) shows a picture of citrus grove captured in Lake Alfred, Florida, USA.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Vibrational Acceleration Spread and Comparison Using Three Citrus Canopy Shaker Shaking Tines

Liu¹,

Ehsani²,

Toudeshki³

et al. 2017

Shock and Vibration

View full text Add to dashboard Cite

The goal of this article is to experimentally study how the vibrational acceleration spreads along the branch shaken by PVC tine, steel tine, and nylon tine for citrus canopy shaking harvesting and to compare the difference. PVC tine and steel tine have potential to be used as shaking rod for citrus canopy shaking harvesting. Nylon tine is a commonly used shaking rod. A tractor-mounted canopy shaker was developed to do the trial. The shaking frequency was set at 2.5 and 5 Hz. Experimental results showed that the vibrational acceleration at the shaking spot is not the highest. Spreading from shaking spot to the stem, it increases evidently. When spreading from stems of the outside subbranch to stems of the nearest inside subbranch, its average decrease percentage is 42%. The overall vibrational acceleration of shaking at 5 Hz is 1.85 times as high as shaking at 2.5 Hz. The overall vibrational acceleration exerted by straight PVC tine and steel tine is 1.77 and 1.97 times as high as that exerted by straight nylon tine, respectively. It is indicated that replacing nylon tine with steel tine or PVC tine helps remove the fruits inside the canopy. Replacing with steel tine is more effective than with PVC tine.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study of Vibrational Acceleration Spread and Comparison Using Three Citrus Canopy Shaker Shaking Tines

Liu¹,

Ehsani²,

Toudeshki³

et al. 2017

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Same letter in the same column shows no significant difference between configuration with a high value of operating parameter (A1 F0 D0 S0, A0 F1 D0 S0, A0 F0 D1 S0, A0 F0 D0 S1) and the reference configuration (Duncan's test, p<0.05). Canopy shaker vibration parameters for traditional olive trees tion at the bonding point of the fruit with the stem or the stem with the branch (Savary et al, 2011). Furthermore, the probability of direct contact between the rods and the fruit during the shaking and free-fall process could be the cause of the increase in damage to the detached fruit , which has a particularly negative effect in terms of table olives quality (Jimenez-Jimenez et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Fruit removal efficiency is affected by modifications to tree structure (Savary et al, 2011), the location of the fruit in the canopy (Ferguson et al, 2010), the characteristics of the fruit itself (Farinelli et al, 2012) or even the physical properties of the wood of the tree resulting from its growth or management (El-Awady et al, 2008). The highest results of removal efficiency with the configuration studied have been relatively low comparing with available commercial canopy shakers (Whitney, 1999), so it is necessary to adjust every parameter to create a good configuration to achieve better results.…”

Section: Harvestermentioning

confidence: 99%

Vibration parameters assessment to develop a continuous lateral canopy shaker for mechanical harvesting of traditional olive trees

Sola-Guirado¹,

Jiménez-Jiménez²,

Blanco-Roldán³

et al. 2016

Span. j. agric. res.

View full text Add to dashboard Cite

certain operations, particularly fruit harvesting. Nevertheless, traditional plantations are widespread globally and play an important social and environmental role, which makes it difficult or unfeasible to substantially change these plantations or even eliminate them entirely. Particularly notable in this respect is olive cultivation in the Mediterranean basin, where 97% of world production is concentrated. More specifically, in Spain, which is home to more than 50% of world olive oil production (AICA, 2014), there are 2,420,000 ha of olive crop, and traditional plantations RESEARCH ARTICLE OPEN ACCESS AbstractThe fruit harvesting is a key factor involving both product quality and profitability. Particularly, mechanical harvesting of traditional oil olive orchards is hint by tree training system for manual harvesting, tree size and several and slanted trunks which makes difficult trunk shaker work. Therefore, canopy shaker technology could be a feasible alternative to develop an integral harvester able to work on irregular canopies. The aim of this research was to determine vibration parameters applied to the olive tree for efficient mechanical harvesting by canopy shaker measuring fruit removal efficiency and debris. In this work, a continuous lateral canopy shaker harvester has been developed and tested on large olive trees in order to analyse the operating harvester parameters and tree properties to improve mutual adaptation. Vibration amplitude and frequency, rod density and ground speed were assessed. Vibration amplitude and frequency beside ground speed were decisive factors on fruit removal efficiency. Increasing rod density has not influenced on removal efficiency although it increased significantly debris. Promising results has been reached with 77.3% of removal efficiency, applying a 28 s shaking duration, 0.17 m amplitude vibration and 12 rod drum. This result was obtained reporting 0.26 s of accumulative shaking time over 200 m/s 2 resultant acceleration. The canopy shaker mechanism enabled more than 65% of detached fruits to fall vertically, facilitating catch fruit. In order to improve removal efficiency it is advisable to adapt trees, set high amplitude in the shaker mechanism, and enhance the contact time between rods and tree.Additional key words: Olea europaea L.; fruit detachment; integral harvester; frequency; amplitude; removal efficiency.

show abstract

“…The acquired x, y and z-axis coordinates of the semi-accelerometers would be shown as a visible text file using the LabVIEW 2016 software architectures [12]. In addition, if more calculations are required, the acceleration forces could be calculated from the known semi-accelerometers sense (3-axial of acceleration values as shown in the existed text-file) and some standard equations of the resultant acceleration and Newton's Second Law of Motion [3,6]. Thus, diagrams of the semi-accelerometer analogue signal could be developed in the reconfigurable students' lab and then utilized for the oscillations in practical applications, such as live …”

Section: Accelerometers' Simulation Contributionsmentioning

confidence: 99%

“…For vibration force measurements on citrus tree canopy, Udumala Savary et al [6] developed a sensing application to reveal the data associated with the tree canopy vibration that was required to detach citrus fruits. Depending on the accelerometer capabilities, the accelerometers' raw data (acceleration and the coordinates of x, y and z-axes) were compiled into a text file by using MathScript through the LabVIEW palettes, and the text file was then utilized to calculate the canopy shaker frequencies and vibration forces.…”

mentioning

confidence: 99%

Development of a LabVIEW Application for Measurement and Analysis of Acceleration Signals from an External Reference

Al-Dosary¹

2017

JAST-A

View full text Add to dashboard Cite

LabVIEW software is a very programmable tool, which can be easily retrofitted and customized to build new aspects of control and database monitoring systems for working with electrical devices. In an instructional environment, the basic LabVIEW software processes provide simulation model of virtual sensors and their associated acceleration output from virtual motion input. This simulation can be used as part of an inclusive perception academic training system for engineering programs. Three virtual accelerometers were used to demonstrate the utility of simulating the acceleration force and vibration principles. A new LabVIEW front panel was developed to represent the sum of the simulation forces acting on each of the 3-axis semi-accelerometers. Thus, raw data strings of the 3-axis semi-accelerometers could be input as simulated real data and analyzed for time and the x, y, z-axis coordinate values. The toolkit of the LabVIEW platform is easy to implement, so engineers and scientists, who are very interested in knowing recent applications of the modern technology and the impact of its development processes, could be able to recognize the LabVIEW toolkits structure optimally, have a comprehensive practice with it and possess an extensive concept of the analysis techniques of this engineering language. Completely, the platform can also be quickly reconfigured to meet any specific laboratory technical requirements. So, this simulation study is underpinning of the accelerated coordinates understanding and has also been exclusive to create a virtual and vital acceleration application via the LabVIEW driver software.

show abstract

Study of force distribution in the citrus tree canopy during harvest using a continuous canopy shaker

Cited by 29 publications

References 13 publications

Experimental Study of Vibrational Acceleration Spread and Comparison Using Three Citrus Canopy Shaker Shaking Tines

Experimental Study of Vibrational Acceleration Spread and Comparison Using Three Citrus Canopy Shaker Shaking Tines

Vibration parameters assessment to develop a continuous lateral canopy shaker for mechanical harvesting of traditional olive trees

Development of a LabVIEW Application for Measurement and Analysis of Acceleration Signals from an External Reference

Contact Info

Product

Resources

About