On the Long-Term Performance of Solitary Wave-Based Transducers for Nondestructive Evaluation Applications
On the Long-Term Performance of Solitary Wave-Based Transducers for Nondestructive Evaluation Applications
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用于无损评估应用的孤立波传感器的长期性能
DOI：
10.1115/1.4054391
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Rizzo, Piervincenzo
中科院分区：
文献类型：
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作者：
Jalali, Hoda;Rizzo, Piervincenzo
近年来，国际上一些研究小组发展了一种基于高度非线性孤立波的无损检测技术。该技术基于这些波沿着球形颗粒的一维单周期阵列的传播和检测，其中阵列的一端与待检查的材料/结构接触，并且相对端处的颗粒通过机械冲击感应波。几项研究表明，波和要评估的元件之间的动态相互作用取决于结构的几何和机械特性，并且可以通过感测在阵列和结构之间的界面处反射的波来监测这种依赖性。这种无损检测技术通常通过使用所谓的HNSW换能器来执行。术语换能器表示由单周期粒子阵列、触发波的装置和检测波的传感元件组成的便携式装置。在本文介绍的研究中，通过将三个传感器放置在测试对象上方来研究其长期性能，该测试对象的机械和几何特性保持恒定一周，同时传感器触发并检测数千个波。通过提取简单的特征，如振幅、飞行时间和互相关，对波的任何可变性进行量化。为了调查变异性的原因，使用短视频以1000 fps捕获了16个测量值。研究结果表明，孤立波的传播时间是最可靠的参数，长期监测与最低的变化和最小的敏感性阵列内的物理变化。此外，本研究的结果允许一个有效的战略框架，以改善设计的传感器，以使HNSW为基础的技术适合长期监测。
A nondestructive evaluation (NDE) technique based on highly nonlinear solitary waves (HNSWs) has been developed recently by a few groups worldwide. The technique is based on the propagation and detection of these waves along a one-dimensional monoperiodic array of spherical particles in which one end of the array is in contact with the material/structure to be inspected, and the particle at the opposite end induces the waves by means of a mechanical impact. Several studies have demonstrated that the dynamic interaction between the waves and the element to be evaluated is dependent on the geometric and mechanical properties of the structure, and such dependency can be monitored by sensing the waves reflected at the interface between the array and the structure. This NDE technique is typically performed by using the so-called HNSW transducer. The term transducer indicates a portable device that consists of a monoperiodic array of particles, a device to trigger the waves, and a sensing element to detect the waves. In the study presented in this article, the long-term performance of three transducers was investigated by placing them above a test object whose mechanical and geometric properties were left constant for a week while the transducers triggered and detected thousands of waves. Any variability of the waves was quantified by extracting simple features such as amplitude, time of flight, and cross-correlation. To investigate the cause of variabilities, 16 measurements were captured with short videos at ∼1000 fps. The results of the study demonstrate that the traveling time of the solitary waves is the most reliable parameter for long-term monitoring with the lowest variability and the least susceptibility to physical changes within the array. In addition, the findings of this study allow the framing of a valid strategy to improve the design of the transducers in order to make the HNSW-based technique suitable for long-term monitoring.