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Predicting acoustic emission attenuation in small steel blocks using a ray tracing technique

机译：使用射线追踪技术预测小型钢块中的声发射衰减

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摘要

Acoustic emission (AE) is a term used for structure-borne elastic waves generated within, or on the surface of, a solid as a result of events such as particle impingement, cracking and sliding or rolling contact. The waves are normally detected using an array of surface-mounted sensors and so structures, processes and machinery can conveniently be monitored using the array, provided that the signals at the sensors can be interpreted in terms of the generating event(s). For signal interpretation in real structures, it is generally not practicable to solve the wave equation for all possible modes of AE propagation from source to sensor and so the current work is aimed at simulating such propagation using a ray tracing technique. As the attenuation of AE signals is affected not only by the material properties but also by the geometry of the object and the type of surrounding media, knowledge of the attenuation is essential to ensure that sensors can be placed appropriately on large or complex structures. The main purpose of this work is to establish a computationally efficient way of predicting the attenuation of AE in complex structures using 3D solid modelling and a ray tracing technique to simulate surface, bulk and combined surface and bulk wave propagation in the solid. This paper is confined to some relatively simple structures with the assumption of total reflection at boundaries. Four different solid steel shapes of varying dimensions have been used and attenuation has been measured and simulated using bulk and surface ray tracing. Adjustments have been made to the model parameters in order to fit the simulation to the measurements. Surface wave, bulk wave and combined surface and bulk wave simulations all give good agreement with the measured results and exhibit the same general differences as the block shape changes. To investigate more subtle changes in the measured results, such as the effect of the environment on reflection at the boundaries, and to investigate the blending of internal and surface simulations, developments of the simulation physics and some further tests will be required.
机译：声发射（AE）是一个术语，用于表示由于诸如粒子撞击，破裂以及滑动或滚动接触等事件而在固体内部或表面产生的结构传递的弹性波。通常使用一系列表面安装的传感器来检测电波，因此只要可以根据发生的事件来解释传感器处的信号，就可以使用该阵列方便地监视结构，过程和机械。对于真实结构中的信号解释，通常无法解决从源到传感器的AE传播的所有可能模式的波动方程，因此当前的工作旨在使用射线跟踪技术来模拟这种传播。由于AE信号的衰减不仅受材料特性的影响，而且还受物体的几何形状和周围介质类型的影响，因此了解衰减的知识对于确保传感器可以适当地放置在大型或复杂的结构上至关重要。这项工作的主要目的是建立一种使用3D实体建模和光线跟踪技术来模拟复杂结构中AE衰减的计算有效方式，以模拟固体中的表面，体积以及组合的表面和体积波传播。本文仅限于某些相对简单的结构，并假设边界处有全反射。已经使用了四种尺寸不同的实心钢形状，并使用体积和表面射线追踪对衰减进行了测量和模拟。为了使仿真适合测量，已经对模型参数进行了调整。面波，体波以及组合的面波和体波模拟都与测量结果完全吻合，并且随着块形状的变化呈现出相同的一般差异。为了研究测量结果中更细微的变化，例如环境对边界反射的影响，并研究内部和表面模拟的混合，需要模拟物理的发展和一些进一步的测试。

著录项

  • 来源
    《Insight》 |2012年第12期|673-680|共8页
  • 作者

    M El-Shaib; R Reuben; T Lim;

  • 作者单位

    Department of Mechanical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh;

    Department of Mechanical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh;

    Department of Mechanical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    acoustic emission; attenuation; ray tracing;

    机译：声发射衰减;光线追踪;

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