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A novel methodology for condition assessment of wood poles using ultrasonic testing

机译：一种使用超声波测试评估木杆状况的新方法

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摘要

This paper presents a new methodology based on theoretical, numerical, and experimental studies for condition assessment of wood poles using ultrasonic tests. Conventional ultrasonic testing of wood poles is based only on wave velocity measurements. Whereas in the new methodology, the condition assessment of a wood pole is represented by statistical quantities called dissimilarity indices; which are computed from ultrasonic measurements. These measurements include compressional wave velocities, transmission factors, and elastic moduli in the radial and tangential directions. The dissimilarity index is computed by comparing the measured parameters in a given pole section with the corresponding expected values and standard deviations for a sound pole. Four ultrasonic transmitters, with nominal frequency of 50 kHz, are evenly spaced around the circumference of the cross-section of the pole. For each transmitter location, an array of five receivers at different angles from the transmitter is used to measure the response of the wood pole to the ultrasonic excitation. Thus, a total of 14 independent raypaths across the section are defined for each test. Laboratory results show that for an area of decay of 30% of the cross-section, the wave velocity and the transmission factor decrease by 51% and 96%, respectively. Whereas the average elastic moduli in the radial and tangential directions are 80% and 43% smaller than the expected values for a sound pole. The observed deterioration pattern in a blind test is in perfect agreement with the predicted condition using the new methodology.
机译：本文提出了一种基于理论，数值和实验研究的新方法，用于使用超声波测试评估木杆的状态。传统的木杆超声波测试仅基于波速测量。而在新方法中，木杆的状况评估由称为不相似指数的统计量表示；根据超声波测量结果计算得出。这些测量包括沿径向和切向的压缩波速度，传输因子和弹性模量。通过将给定磁极部分中的测量参数与声极的相应预期值和标准偏差进行比较，可以计算出相异指数。四个超声波发射器（标称频率为50 kHz）围绕磁极横截面的圆周均匀分布。对于每个发射器位置，与发射器成不同角度的五个接收器阵列用于测量木杆对超声激励的响应。因此，为每个测试定义了总共14条独立的射线路径。实验结果表明，对于30％横截面的衰减区域，波速和透射因子分别降低了51％和96％。而径向和切线方向的平均弹性模量比音杆的期望值小80％和43％。在盲法测试中观察到的劣化模式与使用新方法的预测条件完全一致。

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