Design and Modification of Appropriate Reel Mechanism to Harvest Tef Crop
| dc.contributor.advisor | Abdi, Zewdu (PhD) | |
| dc.contributor.author | Zeleke, Ephrem | |
| dc.date.accessioned | 2018-07-04T07:16:54Z | |
| dc.date.accessioned | 2023-11-18T06:29:19Z | |
| dc.date.available | 2018-07-04T07:16:54Z | |
| dc.date.available | 2023-11-18T06:29:19Z | |
| dc.date.issued | 2012-10 | |
| dc.description.abstract | he relationships between the deflection angle and deflection force acting on a bunch of crop stalk in the gathering operations of a combine harvester reel were analyzed. Mechanical crop model based on bending theory with regard to an elastic beam were applied in this analysis. In the model, the effect of flexural rigidity, crop ear weight and reel force on tef crop stalk in the angle of deflection. A model of crop stem deflection by the combine harvester reel is formulated. The equations derived thereof are evaluated on the basis of empirical data that were acquired through deflection of crop stems in a ready for harvest tef crop in the field. Applications of crop stem deflection to reel design and operation are used for determination of the number of reel tine bar and angular displacement of successive tine bar. The reel design includes determination of the number of tine bar, angular displacement of the reel and rotational speed of reel. The reel adjustment forward and backward relative to the cutter bar and also height adjustment appropriate to the tef crop height. The design of chain derives, shaft and bearing took varies data with appropriated values from the actual combine harvester such as reel speed and maximum torque. In chain drive design, the diameter of larger sprocket and the length of chain were calculated. In shaft design, determination of diameter of shaft that holds the reel force and sprocket tangential force by selected material. In bearing selection, calculating basic dynamic load rating was made to determine type of bearing number, then the correct bearing selected. | en_US |
| dc.description.sponsorship | Addis Ababa University | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/6176 | |
| dc.language.iso | en | en_US |
| dc.subject | Mechanical Design | en_US |
| dc.title | Design and Modification of Appropriate Reel Mechanism to Harvest Tef Crop | en_US |
| dc.type | Thesis | en_US |