Modeling and kinematic analysis of four-bar mechanism for offset rotavator using autodesk inventor
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Date
2013-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Rotary tillage implements are now being projected as important tools in production of fine tilth soil, however the rotavator being in line with the tractor at the back cannot be used in orchards due to the hindrance posed by narrow space between the horticulture crops. Hence there is need of some suitable tillage tool in offset mode to central line of tractor so that it can reach at the canopy of trees with tractor in between rows. Offset rotavators have been found to be the most suitable for this purpose. An important feature of this rotary tillage tool is the side shift system. The side shift system is working on a four-bar mechanism. The study was undertaken to examine the influence of forward speed of tractor and the length of links with dependent parameters such as displacement, angular displacement, angular velocity and angular acceleration of links.
It was found that the position, angular velocity and angular acceleration of link3, was not affected by the length of the link3. The total angle rotate by each length of link is same, 54.5 deg. Initial and final position were also same for each link length.
It was observed that the position and angular velocity of link3, affected by the forward speed of tractor. The total angle of rotating by the link was same but the time taken to rotate the angle was different. The minimum time was taken, 0.18 s in case of 4 km.h-1 and the maximum time was taken, 0.36 s in case of 2 km.h-1 speed. The maximum angular velocity 302.78 deg.s-1 was in case of 4 km.h-1 and minimum angular velocity 151.38 deg.s-1 was in case of 2 km.h-1. The maximum distance covered by link 2 was .73 m in case of 0.80 m length of link3 and minimum distance covered by link 2 was 0.50 m in case of 0.545 m length of links. shift of the offset rotavator can be increased upto 2 m by increasing the length of link.
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