Acoustic Emission Inspection of Atmospheric Storage Tank Based on Different Sensor Arrange
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摘要: 声发射检测技术作为大型常压储罐底板的在线检测技术，其检测结果受传感器布置高度、频率范围、背景噪声高低、定位声速设定等诸多因素的影响。针对两种不同高度的传感器布置方式，通过断铅标定和现场检测分析传感器布置高度对声发射检测结果的影响，结果表明：传感器布置高度为300 mm和600 mm时，实测结果未见明显异常，其误差满足工程检测的要求；将传感器布置在高处的方式容易采集衰减程度小的信号，有利于长距离检测，而将传感器布置在低处的方式更易采集衰减程度明显的信号。Abstract: Acoustic emission technology is a recognized method for large scale atmospheric tank bottom online detection, whose results are affected by many factors, such as the height of sensors, the frequency range of the sensor, the background noise and the sound velocity, etc. In this paper, according to two different arrangements with sensor height, respectively, the influence of the height of sensors on AE detection is analyzed by the broken-lead test and corrosion detection. The results show that there is no obvious difference between results of 300 mm and 600 mm, the error meets engineering requirements. The higher sensor strategy makes it easier to collect the signal with little attenuation which helps the long distance detection. Conversely, the lower strategy is good for the collection of the signal with obvious attenuation.
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[1] 李一博,孙立瑛,靳世久,等.大型常压储罐底板的声发射在线检测[J].天津大学学报,2008,41(1):11-16. [2] PARK S, KITSUKAWA S,KATOH K, et al.AE source and relation between AE activity and rate of corrosion of oil tank bottom plate on acidic soils[J].Materials Transactions,2005,46(11):2490-2496.
[3] 杨明纬,耿荣生.声发射检测[M].北京:机械工业出版社,2005.
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