164
F. Qiu et al.
15.3.3 Experimental Results and Analysis
When the AEwin tank bottom positioning software developed by PAC is used to
locate the acoutic source of tank bottom, the No. 7 sensor on the center of the
bottom plate in the experiment can not be listed as the positioning sensor. Therefore,
a software system (NTBPT
TM , new tank bottom position testing) is developed to
identify and locate the acoustic source by placing sensors in tank. Aewin system and
ntbpttm system are used to locate the acoustic source in the experiment. Figure 15.6
shows AEwin tank bottom positioning software, and Fig. 15.7 shows the localization
of NTBPT
TM .
The results of the two software systems show S1, S2, S3 locations. The result
of AEwin software is with 1, 2, 6 sensor, and NTBPT
TM is with 1, 7, 2. The wave
trigger 7 sensor cause 92 dB amplitude which is 1 dB higher than that of 6 sensor
with 91 dB. The location results of other 2 acoustic source show the same condition.
It can be seen that placing the sensor on the center of the tank bottom can improve the
amplitude of the signal received by the sensor in the triangle forming positioning, and
increase the recognition degree of the acoustic emission detection for the acoustic
source in arbitrary triangle positioning, so as to improve the reliability of positioning
results.
Fig. 15.6 Acoustic source
location of traditional
location method