hUNGARiAN AGRicUltURAl RESEARch

11
10
9
50 Hz, Ø5mm, 60% hopper
Q=0.3924kg/s; T=0.7848kg
y = 0.3924x – 5.5747
R 2 = 1
weight [kg]
8
7
6
5
4
3
2
1
y = 0.3924x - 6.3595
R 2 = 0.9997
0
0 10 20 30 40 50 60
Time [s]
Figure 2: Eight-channel data collector and frequency drive applied
sampling (50Hz). The data
collector and the frequency drive
applied are illustrated in Figure 2.
In the processing of the data,
phenomena taking place at
identical moments had to be
illustrated over time. The basis of
the simultaneous representation of
the different amounts was
provided by the database
comprising 56,000 entries per
measurement. Figure 3 illustrates
the data obtained in one of the
measurement settings. When
establishing the settings, it was
usually the peripheral speed of the
hammer that was changed in order
to permit the comparison. [3]
In Figure 3 you can see that it
was only after the ninth second
when the stabilized phase of
milling began and in the preceding
phase, it took some time until the
motor and the axis of the mill,
according to a previously
determined characteristic, assumed
the working RPMs. In the
Power [W], Rotational speed [1/min]
6000
5000
4000
3000
2000
1000
0
Data measured during milling grain corn
(85m/s peripheral hammer speed)
Mechanical power
Rotational speed of motor
Weight
Electric power
Torque
Temperature of meal
Rotational speed of mill axis
0 5 10 15 20 25 30 35 40 45 50 55 60
Time [s]
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Torque [Nm], Temp. of mela [oC], Weight
[kg] .
Figure 3: Temporal distribution of data measured during milling grain corn
Hungarian Agricultural Research 2009/3–4 15