Manajemen Tenaga dan Mesin Pertanian (TEP 446). Agus Margiwiyatno Semester Ganjil 2012/2013. Pokok Bahasan :. Introduction ( 0.5 – session) Economic Performance ( 2.5 – sessions) Power (2 – sessions) Operations (2 – sessions) Cost Determination ( 2 – sessions)
Semester Ganjil 2012/2013
Introduction (0.5 – session)
Economic Performance (2.5 – sessions)
Power (2 – sessions)
Operations (2 – sessions)
Cost Determination (2 – sessions)
Equipment Selection (3 sessions)
Buku Pegangan Utama : Donnel Hunt, 1979. FARM POWER AND MACHINERY MANAGEMENT. Iowa State University Press.
Komponen Penilaian :
Ujian Tengah Semester (40 %)
Ujian Akhir Semester (40%)
Tugas Terstruktur (20%)
Standar Penilaian :
NA >= 85A
70 < NA < 85B
55 < NA =< 70C
40 < NA =< 55D
NA <= 40E
Optimum farm machinery management occurs when the economic performance of the total machine system has been maximized to produce goods at a profit.
The dimensional units of machine, power, and labour performances are in quantity per time.
These three performance figures add to become an economic performance figure when the quantity per time is divided into the cost per time of each component.
A machine system produces 5 t of forage/hr with a machine cost $4/hr. The system requires 1.5 man.hrs and 1.1 tractor.hrs at $3 and $2, respectively.
The economic performance of the system is :
$1.80 /t => ($4/hr) x (1 hr/5 t) + ($3/hr) x (1 hr/5 t) + ($2/hr)x(1hr/5t)
MEASURES of agricultural machine performance are THE RATE and QUALITY at which the operations are accomplished.
It is determined that a 5-m width-of-cut combine is traveling 1.5 m/s.
In one minute’s time 50 kg grain are collected in the grain tank and 60 kg of material are discharge out of the rear of the machine.
What is capacity of the machine ?
Field Capacity :
[(1.5 m/s) x (5 m/1 ha)] x [(1 ha/ 10000 m2) x (3600 s/1 hr)] = 2.7 ha/hr
Material Capacity :
(50 kg/min) x (60 min/1 hr) = 3000 kg/hr
Throughput Capacity :
[(50kg +60 kg)/min] x [(1 ton/1000 kg) x (60 min/1 hr)] = 6.6 ton/hr
The above capacities are theoretical capacities
List of time element :
Machnine preparation time at the farmstead (includes removal from and preparation for storage, also workshop)
Travel time to and from the field.
Machine preparation time in the field both before and after operations (includes daily servicing, preparation for towing, etc.)
Theoretical field time (the time the machine is operating in the crop at an optimum forward speed and performing over its full width of action)
Turning time and time crossing grass water-ways (machine mechanism are operating).
Time to load or unload the machine if not done on-the-go.
Machine adjustment time if not done on-the-go (includes unplugging)
Maintenance time (refueling, lubrication, chain tightening, etc.; if not done on-the-go, does not include daily servicing).
Repair time (the time spent in the field to replace or renew parts that have become inoperative)
Operator’s personal time.
Item 4 to item 9 are the items included in the term FIELD EFFICIENCY