Agriculture Reference
In-Depth Information
(8)
(9)
wherein c
m,y
is the undetermined parameter.
Another equation is established as follow in order to ensure the conti-
nuity of Equations (8) and (9):
(10)
Equations (5)-(10) should be solved simultaneously to estimate pa-
rameter a
m,y
, b
m,y
and c
m,y
. Then the number of tractors with the representa-
tive power in the interval i can be determined.
7.2.5 UNIT CONSUMPTION MODULE AND PRODUCTIVITY
MODULE
Unit consumption (or motor effi ciency) and productivity of agricul-
tural machinery are both functions of the machinery's rated power. The
simulation results from the Distribution Module are processed by the
Operation Module and then output into the Unit Consumption Module
and the Productivity Module which generate the weighted average of unit
consumption and that of productivity. The data describing the relation-
ship between the input and output of the functions are collected from the
relevant national standards of China and product manuals of those ag-
ricultural machinery [15,16]. They are fi tted by the least square method
(Figures 3 and 4).
The fi tting equation of the unit consumption is as follows:
