Campbell Scientific CR9000X Measurement and Control System - Manual (Page 214)

Section 6. Data Table Declarations and Output Processing Instructions
The next stress cycle to get counted would be the -300 to 100 cycle depicted
below. It would have an amplitude value of 400 and a mean value of -200, thus
a count would be added to bin 3. A new vector from 950 to 0 would be drawn.
CYCLIC STRESS
100
-500
450
-300
100
-500
-600
-400
-200
0
200
400
600
0 1 2 3 4 5 6 7 8 9
Peak Values
St
ress/
St
rai
n
Val
u
es
CYCLIC STRESS
100
-500
450
-500
-600
-400
-200
0
200
400
600
0 1 2 3 4 5 6 7 8 9
Peak Values
St
ress/
St
rai
n
Val
u
es
At this point, we are out of new data points, and we will assume that the Data
Table's output has been triggered. We would bring across the 100 and -500
points to finish off the output for the rainflow histogram. We would count a
stress cycle from -500 to 100 that has an amplitude value of 600 and a mean
value of -200, resulting in a count being added to Bin 3. We would then add
one last stress cycle from -500 to 450, with an amplitude value of 950 and a
mean value of -25. This count would go into bin 5.
CYCLIC STRESS
-500
450
-500
100
-500
-600
-400
-200
0
200
400
600
0 2 4 6 8 10 12 1
Peak Values
Stress/Strain Values
Starting
Point
4
The result of these counts is shown in the table below:
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 :
0
BIN 2 :
0
BIN 3 :
2
BIN 4 :
0
BIN 5 :
1
0 to 500
BIN 6 :
1
BIN 7 :
0
BIN 8 :
0
BIN 9 :
0
BIN 10 :
0
The record stored to the Data Table would look something like:
Time Stamp, Record Number, 0,0,2,0,1,1,0,0,0,0
6-30