University of Khartoum

Biomimentic Computer Simulation Design of Moldboard Plough Surface and Application for Three Types of Soil In Kordofan Area

Biomimentic Computer Simulation Design of Moldboard Plough Surface and Application for Three Types of Soil In Kordofan Area

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Title: Biomimentic Computer Simulation Design of Moldboard Plough Surface and Application for Three Types of Soil In Kordofan Area
Author: Ahemed, Abden Eldi Salim
Abstract: The present study was conducted at Elobied, North Kordofan State, during the period 2011-2013 in three locations; namely, Aldago, Khor Taggat and Algambali near Eobied town. The objectives of the study were to (i) examine the geometrical structure on the body surface of mole cricket as a soil burrowing insect, (ii) determine the physical and mechanical properties of the soil (iii) modify moldboard surface biomimetically in ANSYS program by modeling the structures found on the body surface of mole cricket on inner surface of the implement, and (iv) conduct a computer simulation for conventional smooth surface moldboard and biomimentically non smooth surface moldboard using the Finite Element Method (FEM) with ANSYS program to study stresses distribution on the two implement surfaces. A field experiment was carried out to compare the conventional smooth and modified non smooth surface moldboard by measuring the performance parameters, such as implement draft force, pressure on tool surface, tractor rear wheel slippage, and fuel consumption rate on the three types of soil. The body surface of mole cricket was examined under microscope and found to be composed of convex domes and stepped ridges structures. The cylinder test method of soil showed that the values of soil bulk density were 1.9 g/cm3, 1.5 g/cm3 and 1.3 g/cm3 for Aldago, Khor Taggat and Algambali location, respectively, while the triaxial compression test of soil samples demonstrated that the values of soil cohesion were 15.3 kPa, 10 kPa and 7 kPa for same location in sequence, and the values of internal angle of soil friction were 200 for Aladgo, 310 for Khor Taggat and 340 for Algambali. The soil test indicated that the soil types are clay, gardud (clayey sand) and sand for Aldago, Khor Taggat and Agambali location, respectively. The physical and mechanical properties were used to model the convex domes on the implement surface similar to those structures found on body surface of mole cricket as input. The computer simulation was then conducted to study stresses distribution on two moldboard surfaces. The simulation results showed that the equivalent stress values in case of conventional smooth surface moldboard were 10.20 kPa, 10.25 kPa and 8.72 kPa for clay, gardud and sandy soil, respectively, while the values recorded by biomimetic non-smooth surface moldboard with convex domes were 10.35 kPa, 10.32 kPa and 13.12 kPa for the same soil type in sequence. The values of shear stress in XZ plane (plane of motion), in case of conventional smooth surface moldboard, were 33.20 kPa, 22.11 kPa and 16.02 kPa in clay, gardud and sandy soil, respectively, while the values recorded by biomimetic non-smooth surface moldboard with convex domes were 24.50 kPa, 18.00 kPa and 11.23 kPa for the same soil type in sequence. The results of field experiment demonstrated that the biomimetic non smooth surface with convex domes reduced the draft force by 0.8 kN, 0.6 kN and 0.9 kN in clay, gardod and sandy soil, respectively, while the values of pressure on bottom surface in case of conventional smooth surface were 20.00 kPa, 14.44 kPa and 10.00 kPa in clay, gardud and sandy soil, respectively, while the values recorded by biomimetic non-smooth surface with convex domes were 15.56 kPa, 11.11 kPa and 5.00 kPa for the same soil types in sequence.The rear wheel slippage in case of non smooth surface with convex domes was reduced by 12.5 %, 3.8 % and 9.7 % in clay, gardud and sandy soil, respectively, as compared with conventional smooth surface. Fuel consumption rate in case of biomimetic non smooth surface with convex domes was reduced by 9.3 L/ha, 6.7 L/ha and 10 L/ha as compared with conventional smooth surface in clay, gardud and sandy soil, respectively. The differences between the two surfaces for all performance parameters were significant at P  0.01. It can be concluded that the biomimetically modified with convex domes moldboard surface reduces the stresses distribution and the field performance parameters. It is recommended that the biomimetic modification of soil engaging components of agricultural machineries should be adopted to improve their performance. Also, the computer simulation technique has to be implemented to investigate the stresses distribution and deformations to which the tool is subjected so as to select the optimum design before conducting the field work.
Description: 104 Pages
URI: http://khartoumspace.uofk.edu/123456789/16856
Date: 2015-11-03


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