Acoustic source characteristics of built-in acoustic emission sensor in storage tank
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摘要: 大型原油储罐声发射在线检测技术受罐底直径的影响较大，其中心区域声源信号衰减明显，传统检测方式难以获取完整的罐底腐蚀声源信号。提出了内置传感器阵列与罐壁外周传感器阵列相关联的声发射广域检测方法，通过全相位多次互相关算法得到更精确的声源信号到达时差，并结合三维超定定位算法实现储罐底板腐蚀全域声源信号的准确定位，并在模拟立式储罐中进行验证试验。试验结果表明：基于全相位多次互相关的三维超定定位法可以有效用于传感器内外混合布置的声源定位，定位精度高于传统贴于外壁式检测方法的精度。Abstract: On-line acoustic emission detection technology for large crude oil storage tanks is affected by the larger diameter of tank bottom, and the attenuation of acoustic source signal in the central area is obvious. It is difficult to obtain the complete acoustic source signal of tank bottom corrosion by traditional detection methods. In this paper, a wide-area acoustic emission detection method associated with the built-in sensor array and the peripheral sensor array of tank wall is proposed. The difference of arrival time of acoustic source signal can be more accurately obtained by the full-phase multiple cross-correlation algorithm, and the accurate localization of the whole-area acoustic source signal of tank floor corrosion can be achieved by combining the three-dimensional overdetermined localization algorithm. The validation experiment is carried out in the simulated vertical tank. The experimental results show that the three-dimensional overdetermined location method based on all-phase multi-correlation can be effectively used to locate the sound source with mixed arrangement inside and outside the sensor, and the location accuracy is higher than that of the traditional detection method sticking to the outer wall multiple cross-correlation.
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