Afsaneh Soleimani; Mohammad Hossein Abbaspour-Fard; abbas rohani; mohammadhosein aghkhani
Abstract
Tillers (2WTs) are among the types of small tractors that are usually used in greenhouses, orchards, and paddy fields; they are most useful in places where it is difficult to move tractors. The existing tillers have only one clutch for power transmission to the gearbox, and they do not have ...
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Tillers (2WTs) are among the types of small tractors that are usually used in greenhouses, orchards, and paddy fields; they are most useful in places where it is difficult to move tractors. The existing tillers have only one clutch for power transmission to the gearbox, and they do not have a clutch to guide and steer. For this reason, they have many problems for turning and steering, especially under the trees and changing the movement direction during work. Therefore, in this research, an attempt was made to solve this problem. Two types of plate (disc) and cone friction clutches, which are the most used in agricultural machines, were thought about.The torque generated on the rotors of a 9-hp tiller was calculated while the tiller was running at gear ratio one. The applied forces from the operator (driver) to the clutch plate (disc) for engaging the clutch was calculated. Having the amount of transmission force, torque and available space to the design of the cone clutch, which can be used on the rotary axles of the tiller, was performed using 3D design software (CATIA). To ensure the resistance of parts against failure and their correct operation, static analysis of selected clutch parts that are exposed to maximum stress was performed in ANSYS software. The results indicated that the clutch parts had appropriate strength and hence, would operate safely. Therefore, it can be concluded that it is possible to use the cone clutch on such tillers.Two types of plate (disc) and cone friction clutches, which are the most used in agricultural machines, were considered.The torque generated on the rotors of a 9-hp tiller was calculated while the tiller was running at gear ratio one. The applied forces from the user (driver) to the clutch plate (disc) for engaging the clutch was calculated. Having the amount of transmission force, torque and available space to the design of the cone clutch, which can be used on the rotary axles of the tiller, was performed using 3D design software (CATIA). To ensure the resistance of parts against failure and their correct operation, static analysis of selected clutch parts that are exposed to maximum stress was performed in ANSYS software. The results indicates that the clutch parts have appropriate strength and hence, would operate safely. Therefore, it can be concluded that it is possible to use the cone clutch on such tillers.
Hamid mohammadinezhad; Mohammad Hossein Aghkhani; Mohammad Hossein Abbaspour-Fard; Abbas Rohani
Abstract
In urban environments, root growth is limited because of limitation of soil and some problems the plants are faced with, for example soil compaction. The aim of this study was to build and evaluate a device that could improve the existing deficiencies for tree roots by increasing soil porosity and permeability ...
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In urban environments, root growth is limited because of limitation of soil and some problems the plants are faced with, for example soil compaction. The aim of this study was to build and evaluate a device that could improve the existing deficiencies for tree roots by increasing soil porosity and permeability through air injection. After construction of the machine, weighing 240 kg, equipped with a 7.5 HP engine and maximum injection pressure of 12 bar, the effects of machine operation and some important physical properties of soil such as porosity and infiltration were investigated. Multiple linear regression was used to investigate the relationship between the independent variables of the device including air pressure at 3 levels (4, 8 and 12 bars) and depth at 2 levels (30 and 60 cm) and the dependent variable of porosity. The results showed a significant regression model among the variables. Also, the regression model estimation error was 1.75%. Based on the results, the system can be reliably designed and manufactured to inject air into the soil to increase porosity.
Siamak Moslehi Roodi; Mohammad Hossein Abbaspour-Fard; Mohammad Hossein Aghkhani
Abstract
In this study, a software model was developed for the spreader unit of a centrifugal fertilizer and its spread performance was studied with different blade designs to recommend the best suitable blade for spreading of the pellet fertilizer. The blade designs include trapezoid, angled trapezoid, channel ...
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In this study, a software model was developed for the spreader unit of a centrifugal fertilizer and its spread performance was studied with different blade designs to recommend the best suitable blade for spreading of the pellet fertilizer. The blade designs include trapezoid, angled trapezoid, channel (U shape) and angle (L shape) that were compared with the control blade. In order to validate the software's results, a laboratory spreader device was fabricated based on a commercial centrifugal fertilizer machine. The spread pattern of the designed blades was investigated experimentally in a completely randomized design with three replications. The influence of blade design as the dependent variable, on Total Transverse Spreading Pattern (TTSP) and Coefficient of Variation (CV) as the dependent variables, was investigated to achieve the best design for blade in the experimental mode. Results showed that the trapezoid blade, among other blades, had the best spread performance with in the effective swath width during pellet spreading (CV=0.18). Other blades were ranked as angle blade (CV=0.29), channel blade (CV=0.38), angled trapezoid blade (CV= 0.57) and control blade (CV= 0.64) respectively. This ranking observed for both numerical software and the experimental results. Investigation on adaptation and compatibility between the software model and experimental results showed that, for all blades designs, there were acceptable agreements between software model and experimental (R2 ≥ 0.90).
mohammad dehghan; Hassan Sadrnia; Mohammad Hossein Abbaspour-Fard
Abstract
Plastic debris remaining in the field after harvest is one of the difficulties in farming under plastic mulch. In this study, the performance parameters of a domestic plastic remover machine in collecting plastic mulches were evaluated. The dependent factors were fuel consumption, plastic tearing frequency ...
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Plastic debris remaining in the field after harvest is one of the difficulties in farming under plastic mulch. In this study, the performance parameters of a domestic plastic remover machine in collecting plastic mulches were evaluated. The dependent factors were fuel consumption, plastic tearing frequency during collecting and the total collecting time. The independent factors included film thickness (two levels: 20 and 30 μm), ground speed (three levels: 2.7, 3.8 and 5.4 km/h) and the time interval between harvesting and plastic collecting (two levels: 5 and 10 days). The tests were performed in triplicate in a full factorial experimental design. Experiments were carried out in some farms of Fars province employing a two-wheel drive MF399 tractor. The results showed that using thick plastic (30 μm) reduces the plastic tearing frequency and hence with a lower number of stops, reduces the fuel consumption and increases the efficiency of the machine during plastic collection. To increase the efficiency of plastic collection, when using 30 μm plastic, the ground speed of 5.4 km/h is recommended. The best plastic collecting time with the minimum tearing frequency of are recommended as 5 and 10 days after harvesting for 20 and 30 μm plastics, respectively. According to the results the least fuel consumption was observed for collection of 30 μm plastic and with ground speed of 5.4 km/h. Also the simultaneous collection of drip irrigation tapes and plastic mulch tapes reduce costs and increase the efficiency of the plastic mulch remover.
