Campbell-scientific CR9000X Measurement and Control System Manual de usuario Pagina 213

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Section 6. Data Table Declarations and Output Processing Instructions
Given this, the count would be output to bin:
C(1,1) when 0 Amp < 200 and -500 Mean < 0
C(1,2) when 200 Amp< 400 and -500 Mean < 0
C(1,3) when 400 Amp < 600 and -500 Mean < 0
C(1,4) when 600 Amp < 800 and -500 Mean < 0
C(1,5) when 800 Amp < 1000 and -500 Mean < 0
C(2,1) when 0 Amp < 200 and 0 Mean < 500
C(2,2) when 200 Amp< 400 and 0 Mean < 500
C(2,3) when 400 Amp < 600 and 0 Mean < 500
C(2,4) when 600 Amp < 800 and 0 Mean < 500
C(2,5) when 800 Amp < 1000 and 0 Mean < 500
Shown in a Table format:
Amplitude Column Bin Ranges
Mean Range
0 to 200 200 to 400 400 to 600 600 to 800 800 to 1000
-500 to 0
BIN 1 :
C(1,1)
BIN 2 :
C(1,2)
BIN 3 :
C(1,3)
BIN 4 :
C(1,4)
BIN 5 : C(1,5)
0 to 500
BIN 6 :
C(2,1)
BIN 7 :
C(2,2)
BIN 8 :
C(2,3)
BIN 9 :
C(2,4)
BIN 10 :
C(2,5)
Rainflow Example Continued: Assume a member is going through a stress
cycle with peaks and values shown in the graph below, using the instruction set-
up as shown previous in this example.
CYCLIC STRESS
100
-500
450
50
200
-300
100
-500
-600
-400
-200
0
200
400
600
0123456789
Peak Values
Stress/Strain Values
The first stress cycle that would be counted is from 50 to 200 as shown below.
The amplitude of this stress cycle is 150 and the mean is 125, so the count
would go into bin 6, the cycle removed, and the 450 point would be connected
to the -300 point.
CYCLIC STRESS
100
-500
450
50
200
-300
100
-500
-600
-400
-200
0
200
400
600
0123456789
Peak Values
Stress/Strain Values
CYCLIC STRESS
100
-500
450
-300
100
-500
-600
-400
-200
0
200
400
600
0123456789
Peak Values
Stress/Strain Values
6-29
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