基于概率约束的超声相控阵输煤机工伤缺陷检测

Ultrasonic Phased Array Coal Conveyor Work-related Defect Detection Based on Probability Constraints

输煤机常处于复杂且恶劣的运行环境中,对其外部探伤过程中,存在信息缺失和遮挡干扰,当前以固定阈值为基础的探查方法容易忽略出现各类工伤缺陷的概率波动,单一阈值很难描述这种概率波动,导致检测效果差。针对上述问题,该文提出超声相控阵技术下输煤机工伤缺陷检测方法。分析输煤机工伤缺陷事件类型,计算设备工伤缺陷事件发生概率。以缺陷概率为约束条件,基于超声相控阵列的几何参数,计算平面和凸面超声相控阵聚焦声压,确定回波信号的数据深度。遍历发射阵元和发射通道,通过比较设定阈值的幅度、信号峰值、谷值,判断输煤机是否发生工伤缺陷,实现工伤缺陷检测。实验结果表明,所提方法能够准确检测到输煤机中的所有工伤缺陷。

Coal conveyors are often in complex and harsh operating environments,and there is information loss and obstruction interference during their external inspection process.The current detection methods based on fixed thresholds are prone to ignoring the probability fluctuations of various work-related defects.A single threshold is difficult to describe this probability fluctuation,resulting in poor detection results.Research on the detection method of work-related injuries and defects in coal conveyors using ultrasonic phased array technology.Analyze the types of work-related injury and defect events of coal conveyors,and calculate the probability of equipment work-related injury and defect events.Based on the geometric parameters of the ultrasonic phased array with defect probability as the constraint,calculate the focused sound pressure of the planar and convex ultrasonic phased array,and determine the data depth of the echo signal.Traverse the transmission array elements and transmission channels,compare the amplitude,signal peak,and valley values of the set threshold to determine whether the coal conveyor has work-related defects,and achieve work-related defect detection.The experimental results show that the proposed method can accurately detect all work-related defects in the coal conveyor.