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首页> 外文期刊>Canadian Journal of Civil Engineering >Probabilistic characterization of ultrasonic wave propagation in wood poles
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Probabilistic characterization of ultrasonic wave propagation in wood poles

机译：木杆中超声波传播的概率表征

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摘要

Wood poles are widely used in North America to support power electric transmission and distribution lines. Wood poles are continuously exposed to wide ranging temperature and moisture conditions, making them vulnerable to internal decay and rotting. The resulting loss of strength makes the poles vulnerable to failure under adverse weather conditions, such as wind and snow storms. These failures can result in forced outages and customer disruptions with significant economic losses. Ultrasonic testing is a non-destructive method that has been used for detection of internal deterioration of in-service wood poles, which is based on the comparison of the measured wave velocity with a reference wave velocity associated with sound wood. The current ultrasonic methods assume that the reference wave velocity for a given wood species is constant in a pole cross section. This approach is simplistic because wood is an orthotropic material with highly variable material properties. This paper presents a method for probabilistic characterization of ultrasonic wave propagation in wood poles considering wood as an orthotropic material. A better understanding and characterization of ultrasonic wave propagation in a pole cross section will contribute to improve the condition assessment of in-service wood poles based on ultrasonic tests. As an example, P-wave velocity, surface waves, frequency response function, and magnitude spectrum area are used to characterize the propagation of ultrasonic waves at a cross section of a Douglas-fir pole of 25 cm diameter.
机译：木杆在北美被广泛用于支持电力输配电线路。木杆不断暴露于广泛的温度和湿度条件下，使其易于内部腐烂和腐烂。强度的损失使磁极在恶劣的天气条件下（如风和暴风雪）容易损坏。这些故障可能导致强迫停机和客户中断，并造成重大的经济损失。超声波测试是一种无损检测方法，已用于检测在役木杆的内部劣化，该方法基于将测得的波速与与正常木材相关的参考波速进行比较。当前的超声方法假设给定木材物种的参考波速在极点横截面中是恒定的。由于木材是具有高度可变的材料特性的正交异性材料，因此该方法非常简单。本文提出了一种以木材为正交异性材料的超声波在木杆中传播的概率表征方法。更好地理解和表征杆截面中的超声波传播将有助于改善基于超声波测试的在役木杆的状态评估。例如，P波速度，表面波，频率响应函数和幅度谱区域用于表征超声波在直径为25 cm的道格拉斯冷杉极的横截面上的传播。

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