AE source positioning technologies under the condition of strong noise

作者：Liu Mao Jun; Wang Gen Wei; Xu Guo Ping; Zhou Sheng Kai

来源：International Journal of Earth Sciences and Engineering, 2015, 8(5): 2283-2289.

• AE source
• Basic characteristics
• Collection frequency
• Comparative analysis
• Concrete highway bridges
• Noise
• Positioning
• Positioning technologies

In order to study the AE source positioning method under the condition of strong noise, AE experiment was carried out in the box girder of a pre-stressed and reinforced concrete highway bridge in operation. After the collection and analysis of AE signals of noise and on-the-spot lead break experiment, the corresponding positioning parameters were acquired. After a comparative analysis between the characteristic of AE signals of noise and the energy-average frequency correlation graph of AE signals, the basic characteristics of AE signals of noise were acquired, and the corresponding denoising methods concluded. Studies show that under the condition of strong noise, through setting the proper collection threshold and the range of collection frequency, some noise signals can be filtered. But the positioning does not have a high accuracy. Through further analysis of energy-average frequency correlation graph, ambient noise that is above the threshold and is strong enough to cause an event can be further filtered, thus improving positioning accuracy. In the meantime, by clustering the location maps, the cluster center can get closer to the AE source.

• 出版日期2015
• 单位桂林理工大学