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局放超声阵列定位方法是阵列传感器技术与阵列信号处理技术发展的最新成果之一。为此,采用改进型圆形超声阵列传感器对局放源进行测向定位。首先研制了改进型圆形超声阵列传感器,并搭建了油中局放定位实验平台;接着采用相位模式激励算法、MUSIC算法以及多平台交叉定位相结合的方法对圆形阵列信号进行测向定位,最后运用快速独立分量分析(fast independent component analysis,FastICA)算法对超声阵列信号进行去噪后再进行测向定位。结果表明:采用改进型圆形阵列传感器的定位准确度优于传统圆形阵列和方阵;比较去噪前后的定位效果发现去噪后的定位误差为3.8cm,优于去噪前的11.3cm。多次实验验证了该方法的有效性。
Partial positioning ultrasonic array positioning method is one of the latest achievements in the development of array sensor technology and array signal processing technology. To this end, the use of improved circular ultrasonic array sensors to locate the release source directional mapping. Firstly, an improved circular ultrasonic array sensor was developed and a PD experimental platform for oil was built. Secondly, the phase array excitation algorithm, the MUSIC algorithm and the multi-platform cross-location method were combined to locate the circular array signal. Finally, the Fast Independent Component Analysis (FastICA) algorithm is used to denoise the ultrasonic array signal and then locate it. The results show that the positioning accuracy of the improved circular array sensor is better than that of the traditional circular array and square matrix. The comparison of the positioning effect before and after denoising shows that the positioning error after denoising is 3.8cm, which is better than 11.3cm before denoising . Several experiments show the effectiveness of this method.