Prediction of the Lifting Forces for Cassava Harvesting

Agbetoye, L. A. S.; Dyson, Jeremy; Kilgour, J.

doi:10.1006/jaer.1999.0483

Cited by 15 publications

(9 citation statements)

References 7 publications

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“…Other mechanical cassava harvesters include, CLAYUCA Cassava Harvester Model P600, semi-mechanized cassava harvester prototypes developed in Brazil and the NCAM Tractor-drawn Tuber Harvester developed by the National Centre for Agricultural Mechanization (NCAM) in Nigeria. Agbetoye et al [37] or about 500 kg of soil to harvest a plant. All these unique characteristics must be appropriately considered to design an efficient harvester [16,38].…”

Section: Harvestingmentioning

confidence: 99%

Ecophysiology and Production Principles of Cassava (Manihot species) in Southeastern Nigeria

Anikwe¹,

Ikenganyia²

2018

Cassava

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Cassava (Manihot species) is a crop of the humid tropics that belongs to the family Euphorbiaceae. Cultivated forms belong to the species "Manihot esculenta Crantz" and "Manihot utilissima Pohl." Africa produces about 50-80 million tonnes of cassava annually; this translates into an average of more than 300 calories per day for more than 200 million people. Cassava can grow on relatively marginal soils and erratic rainfall conditions in southeastern, Nigeria. It quickly adapts and integrates into the traditional farming system, is easy to cultivate and process and it is available all year round acting as a buffer against crop failure. These characteristics make this root crop a necessary component of the farming system in many areas of Africa south of the Sahara. Some of the principal recommended cultivated varieties in Nigeria include; TME 419, TMS 90257, TMS 91934, TMS 81/00110, TMS 82/00661, TMS 30001, TMS 30555, TMS 30572 and local cultivars-Nwugo, Nwaiwa, Ekpe and Okotorowa that are popular in southeastern Nigeria. Cassava is expected to play increased role in Africa's struggle to attain food and nutrition security through increased production and utilization. This paper examines the ecophysiology, production principles, pest and disease management, uses and constraint hampering cassava production in southeast Nigeria.

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Section: Harvestingmentioning

confidence: 99%

Ecophysiology and Production Principles of Cassava (Manihot species) in Southeastern Nigeria

Anikwe¹,

Ikenganyia²

2018

Cassava

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“…The uplift bearing capacity of rock-socketed pedestal pile is mainly composed by four parts: the first part is uplift resistance of pile body in the overburden soil; the second part is vertical component of resultant force on rupture surface; the third part is weight of rock in rupture surface; and the last part is weight of pile body (Tafreshi et al 2014;Agbetoye et al 2000):…”

Section: Formula Derivation Processmentioning

confidence: 99%

Calculation method and influencing factors of uplift bearing capacity of rock-socketed pedestal pile

Wang

Cao

2021

Arab J Geosci

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With the rapid development of transmission line engineering in the west of China, the uplift problem of the tower foundation affected by extreme weather has provoked increasing concerns. Based on Balla rupture surface assumption and limit equilibrium method, a simplified calculation method of uplift bearing capacity of rock-socketed pedestal pile is derived. According to the results of the centrifugal model test and in situ field test, it is verified that the Balla rupture surface hypothesis is suitable for describing the failure mode of rock and the reliability of the calculation method. Furthermore, by combing the PLAXIS 3D numerical simulation results, the influence factors of uplift bearing capacity are compared and analyzed. Results show that the failure mode of rock is a trumpet-shaped surface, and it can be expressed by Balla rupture surface equation. The undetermined parameter N of rupture surface shape presents a negative correlation with mechanical integrity and uniaxial compressive strength (UCS) of the rock. The complete soft rock (5 MPa < UCS ≤ 6 MPa) should be N = 0.6, the strongly weathered soft rock (5 MPa < UCS ≤ 6 MPa) should be N = 1.5, and strongly weathered extremely soft rock (UCS = 2.6 MPa) should be N = 3.0. Additionally, the method provides a good reference for the calculation of uplift bearing capacity of tower foundation in similar regions.

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“…However, tubers might be broken or lost if the tuber-lifting velocity was improper for cassava harvesting in soils having different hardness, which would result in poor harvesting quality. [6][7][8] Thus, an optimal mechanized tuber-lifting velocity model (TLVM) is critical for designing an efficient ''dig-pull'' cassava harvester, which can significantly reduce tuber-lifting pulling time and tuber losses.…”

Section: Introductionmentioning

confidence: 99%

Optimized tuber-lifting velocity model for cassava harvester design

Wang

Rui-xia

et al. 2018

Advances in Mechanical Engineering

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The lack of optimized lifting velocity model for cassava tuber lifting results in the shortage of evidence of design of lifting velocity control system and large harvest loss during mechanized harvesting of cassava. First, an optimized velocity model of manually pulling tubers and a velocity model of mechanical lifting tubers were established using physical experiments. And then using the mechanical tuber-lifting velocity model, the mathematical models between coefficients of mechanical tuber-lifting velocity model and cassava harvesting quality were established based on numerical simulation and regression analysis. Moreover, the coefficients were optimized using optimization method and the mechanical optimal tuber-lifting velocity model was obtained. Finally, the optimization results and the mechanical optimal tuber-lifting velocity model were verified by simulation and physical experiment, respectively. The results show that the optimized manual pulling velocity model can be superimposed by a line and a sine curve or a concave downward parabola and a sine curve. The optimal coefficients' combination of mechanical tuber-lifting velocity model is shown as follows: A = 0.056, B = 0.521, C = 0.048, D = 0.086, E = 38.506, and F = 1.165. The mechanical optimal tuber-lifting velocity model's expression is simple and the model is reasonable. The mechanical optimal tuber-lifting velocity model, which is established using physical experiments, simulation method, and optimization technique, has great significance for designing lifting velocity control system.

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Prediction of the Lifting Forces for Cassava Harvesting

Cited by 15 publications

References 7 publications

Ecophysiology and Production Principles of Cassava (Manihot species) in Southeastern Nigeria

Ecophysiology and Production Principles of Cassava (Manihot species) in Southeastern Nigeria

Calculation method and influencing factors of uplift bearing capacity of rock-socketed pedestal pile

Optimized tuber-lifting velocity model for cassava harvester design

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