02685cas a2200265 a 450000500170000000800410001703500150005810000230007324500580009626000520015430000100020649000270021650001560024350200580039952015780045765000100203565000270204570000330207270000390210570000440214470000470218871000600223581000590229585600650235420260818094903.0110920s1988    th uu|m rtt   0|  a1eng d  a.b106901651 aMufti, Azhar Iqbal14aThe effect of coating on floats and mouldboard plough  aBangkok :bAsian Institute of Technology,c1988  a76 p.1 aThesis ;vno. AE-88-14  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1988  aIn an effort to reduce the energy requirements of the tillage tools  in a farming operation, a study was conducted to investigate the effect  of enamel coating on floats and the mouldboard plough, under controlled  laboratory conditions in Bangkok clay soil at different soil moistures  and travel speeds. The Friction characteristics of enamel improved the  scouring and reduced the Draft requirements of both the enamel coated  floats and mould boardplough.  A reduction of 30 to 50 % in drag of floats was recorded in Teflon  and Enamel coated floats under dry and wet soils (14 - 31 %, soil m. c.).  In puddled saturated soil, a 11 - 30 % decrease in drag was observed for  enamel and Teflon coated floats respectively. The overall performance of  the enamel coated float was better than other coatings namely; Teflon,  Zinc and Mild- steel at all moisture levels. Qualitative observations  indicated enamel to be more resistant to abrasion than Teflon and Zinc  and Enamel showed better scouring qualities operating in dry soils, ( 16%  m.c. db) showed a decrease in draft of 19- 22% for the speed range of 1 - 3 km/hr. In wet unsaturated soils (21 & 31 %), 3 to 28% reduction in  plough draft was noticed in the same speed range. Puddled saturated soil  (51 & 58% m.c. db) also gave 3 to 28 % reduction in draft in the same  speed range (1 - 3 Km/hr.). In saturated soils, low travel speed gave  higher reduction (28%) in plough draft. In wet soils the scouring of the  enamel was much better than the uncoated one. A cyclic nature of the  plough forces was observed. 0aPlows 0aAgricultural machinery1 aGee-Clough, D.,eChairperson1 aSalokhe, Vilas M.,eCo-Chairperson1 aSingh, Gajendra,eExamination Committee1 aGupta, Chandra P., eExamination Committee2 aThe Royal Government of Netherland, eScholasrhip Donor2 aAsian Institute of Technology.tThesis ;vno. AE-88-14  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B18914