压力管道声发射信号去噪方法研究

Study on Denoising Method of Acoustic Emission Signal in Pressure Pipeline

随着我国经济的快速发展,压力管道作为基础设备被广泛应用到各工业领域。在生产生活中,压力管道主要输送易爆、易燃、高温、高压的危险介质,一旦管道发生泄漏,会引发爆炸、中毒等危险事故。因此通过声发射检验可及早发现压力管道内部缺陷,保障设备安全运行。但由于各类噪声广泛存在于压力管道检验现场,导致采集的声发射信号淹没在噪声信号中甚至严重失真。通过研究小波阈值去噪、卡尔曼滤波等理论基础,采取小波-卡尔曼联合滤波进行含噪声发射信号的去噪预处理,将对压力管道泄漏定位产生重要影响。

With the rapid development of China's economy,pressure pipelines are widely used in various industrial fields as basic equipment.In production and life,pressure pipelines mainly transport explosive,flammable,high-temperature and high-pressure dangerous media.Once the pipeline leaks,it will cause dangerous accidents such as explosion and poisoning.Therefore,the internal defects of penstock can be found early through acoustic emission inspection to ensure the safe operation of equipment.However,because all kinds of noise widely exist in the pressure pipeline inspection site,the collected acoustic emission signal is submerged in the noise signal and even seriously distorted.By studying the theoretical basis of wavelet threshold denoising and Kalman filter,the denoising pretreatment of noisy emission signal by using wavelet-Kalman filter will have an important impact on the location of pressure pipeline leakage.