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基于迟滞应力应变关系的非线性声学检测理论与方法研究

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张世功, 吴先梅, 张碧星. 2014: 基于迟滞应力应变关系的非线性声学检测理论与方法研究, 物理学报, null(19): 194302. doi: 10.7498/aps.63.194302
引用本文: 张世功, 吴先梅, 张碧星. 2014: 基于迟滞应力应变关系的非线性声学检测理论与方法研究, 物理学报, null(19): 194302. doi: 10.7498/aps.63.194302
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Zhang Shi-Gong W, u Xian-Mei, Zhang Bi-Xing. 2014: Theory and metho d for nonlinear acoustics detection based on hysteretic stress-strain relation, Acta Physica Sinica, null(19): 194302. doi: 10.7498/aps.63.194302
Citation: Zhang Shi-Gong W, u Xian-Mei, Zhang Bi-Xing. 2014: Theory and metho d for nonlinear acoustics detection based on hysteretic stress-strain relation, Acta Physica Sinica, null(19): 194302. doi: 10.7498/aps.63.194302
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基于迟滞应力应变关系的非线性声学检测理论与方法研究

  • 中国科学院声学研究所声场声信息国家重点实验室,北京,100190

Theory and metho d for nonlinear acoustics detection based on hysteretic stress-strain relation

  • 摘要: 本文将传统PM(Preisach-Mayergoyz)模型由一维介质拓展到二维介质，引入迟滞细观弹性单元概念，得到迟滞变化的应力应变关系。并采用一阶有限差分方程进行了声场计算和分析，发现空间声场中含有明显的高阶奇次谐波成分。对接收到的全波信号进行滤波、放大、时间反转后加载到接收换能器对应阵元上再进行发射，观察到高次谐波在微损伤区域实现聚焦。这为利用非线性高次谐波检测微损伤提供了可能的途径，也为疲劳损伤等缺陷的早期检测提供了理论和方法依据。
    Abstract: In this paper, PM (Preisach-Mayergoyz) model in one dimension is extended to two dimensions. Hysteretic stress-strain relation could be obtained when hysteretic mesoscopic elastic unit (HMEU) is considered.The sound field is calculated using a first-order finite difference equation, and the high-odd-order harmonic waves can be found apparently in the sound field. Then, the received full waves are filtered,amplified, time-reversed, and re-emitted through corresponding receiving transducers. The high-order harmonic waves focus on the micro-damage zone. So this method can be used to detect the micro-damages by nonlinear high-order harmony waves. Furthermore, it also provides a method of the early detection of fatigue damages.
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  • 刊出日期:  2014-10-15

基于迟滞应力应变关系的非线性声学检测理论与方法研究

  • 中国科学院声学研究所声场声信息国家重点实验室,北京,100190

摘要: 本文将传统PM(Preisach-Mayergoyz)模型由一维介质拓展到二维介质，引入迟滞细观弹性单元概念，得到迟滞变化的应力应变关系。并采用一阶有限差分方程进行了声场计算和分析，发现空间声场中含有明显的高阶奇次谐波成分。对接收到的全波信号进行滤波、放大、时间反转后加载到接收换能器对应阵元上再进行发射，观察到高次谐波在微损伤区域实现聚焦。这为利用非线性高次谐波检测微损伤提供了可能的途径，也为疲劳损伤等缺陷的早期检测提供了理论和方法依据。

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