142
Z. Wang et al.
5
105
205
305
405
505
605
705
805
905
1005
1105
t / min
4
6
8
10
12
14
16
18
20
22
24
Ring Count
Fig. 13.5 Ring count
5
105
205
305
405
505
605
705
805
905
1005
1105
t / min
0
0.1
0.2
0.3
0.4
0.5
Rise Time t / ms
Fig. 13.6 Rise time
with the improved AE index. Peak-peak and peak are relatively stable in B area. But
the judgement for slight damage and slight pitting is a little later than frequency
domain peak.
In Fig. 13.10, the trend of these five indexes is opposite in B and C area compare
with the same area in Fig. 13.9. These five indexes show an upward trend in initial
operation stage. Kurtosis and waveform index are relatively stable at this stage. In
a short period of time before entering the stage of minor injury, each index has an
upward mutation process. Judgement in slight damage stage by pulse index margin
index and peak index is relative delay. But it can be able to determine the appearance
of slight pitting earlier than the indexes in group 1.
Z. Wang et al.
5
105
205
305
405
505
605
705
805
905
1005
1105
t / min
4
6
8
10
12
14
16
18
20
22
24
Ring Count
Fig. 13.5 Ring count
5
105
205
305
405
505
605
705
805
905
1005
1105
t / min
0
0.1
0.2
0.3
0.4
0.5
Rise Time t / ms
Fig. 13.6 Rise time
with the improved AE index. Peak-peak and peak are relatively stable in B area. But
the judgement for slight damage and slight pitting is a little later than frequency
domain peak.
In Fig. 13.10, the trend of these five indexes is opposite in B and C area compare
with the same area in Fig. 13.9. These five indexes show an upward trend in initial
operation stage. Kurtosis and waveform index are relatively stable at this stage. In
a short period of time before entering the stage of minor injury, each index has an
upward mutation process. Judgement in slight damage stage by pulse index margin
index and peak index is relative delay. But it can be able to determine the appearance
of slight pitting earlier than the indexes in group 1.