Syllabus - Farm Machinery Design (AT-702 (B))

Farm machinery design - modern trends - tasks and requirements - economic considerations - durability, reliability and rigidity.

Physico mechanical properties of soils - technological process of ploughing - wedge theory - working process of mould board plough - determination of basic parameters - Design of coulters - shares - mould boards. Machines and implements for surface and inter row tillage - peg toothed harrow - disk harrows - rotary hoes - graders - rollers - cultivators - design of V shaped sweeps - rigidity of working tools. Rotary machines - trajectory of motion of rotary tiller tynes - forces acting - power requirement. Machines with working tools executing an oscillatory motion. Design considerations for Grain hoppers – seed metering mechanism – furrow openers and seed tubes. Machines for fertilizer application – discs type broadcasters. Organic fertilizer application - Properties of organic manure – spreading machines. Liquid fertilizer distributors. Planting and transplanting – paddy transplanters – potato planters. Hydraulic nozzles. Power operated hydraulic sprayer design principles. Controlled droplet application. Spray drift and its mitigation. Use of drones for spraying – design of spray generation and application issues. Crop harvesting- plant properties- physical and mechanical properties of plant stem-plant bending modeling.Harvesters, basic principles of design and its sub-systems. Cereal threshing and separation- design of tangential and axial threshing units. Performance indicesof threshing units. Factors influencing the threshing process and power requirement. Separation process and design of straw walker. Cleaning unit process and operation. Grain pan- chaffer and bottom sieve.