Simulation of Dir-MUSIC Direction-Finding Algorithm for Partial Discharge Direction-Finding Ultrasonic Array
The ultrasonic testing method is widely used in the detection and positioning of insulation status of power equipment.The directional MUSIC(Dir-MUSIC)direction-finding algorithm based on direction-finding ultrasonic array signal strength information is proposed to overcome the shortcomings of MUSIC algorithm for partial discharge ultrasonic direction-finding,such as high sampling rate requirements and large computational complexity.On the basis of elaborating on the theoretical model and application conditions of the algorithm,the paper simulates and studies the direction-finding accuracy of the Dir-MUSIC algorithm under differ-ent gain pattern main lobe width and signal-to-noise ratio conditions for a uniform disc ultrasonic array.The simulation results show that the 8-element array has the highest direction-finding accuracy at a signal-to-noise ratio of-5 dB and a main lobe width of 90 °～120 °,with a root mean square error of less than 2 °.Finally,a direction-finding experiment is conducted based on the developed MEMS direction-finding ultrasound array.The results show that the root mean square error of direction-finding for the 8-element disc ultrasound array is the minimum of 2.76 °,and the standard deviation of direction-finding is the minimum of 2.72 °,which verify the effectiveness and accuracy of the Dir-MUSIC algorithm.
万方数据
维普
