28 Research on Acoustic Emission Technology for Tank Floor …
343
Channel
Impacts
Fig. 28.9 Impact number of channel under some guard sensor
Fig. 28.10 Event plane
location under global guard
sensor
X Distance/mm
Y Distance/mm
28.3.4 Result Analysis
(1) From Figs. 28.4, 28.5, 28.7, 28.8 and 28.10, 28.11, it can be seen that for the
same tank and the same operation condition, the number of event location under
three different working conditions decreased significantly, from 139 per min to
1 per minute on average. It can be seen that the guard sensor can effectively
block the noise from the nitrogen sealing system;
(2) It can be seen from Figs. 28.4 and 28.7 that the location map in the mode of
local guard sensor presents petal shape, that is, there is no location event in the
343
Channel
Impacts
Fig. 28.9 Impact number of channel under some guard sensor
Fig. 28.10 Event plane
location under global guard
sensor
X Distance/mm
Y Distance/mm
28.3.4 Result Analysis
(1) From Figs. 28.4, 28.5, 28.7, 28.8 and 28.10, 28.11, it can be seen that for the
same tank and the same operation condition, the number of event location under
three different working conditions decreased significantly, from 139 per min to
1 per minute on average. It can be seen that the guard sensor can effectively
block the noise from the nitrogen sealing system;
(2) It can be seen from Figs. 28.4 and 28.7 that the location map in the mode of
local guard sensor presents petal shape, that is, there is no location event in the