本文選題：激光超聲 + 透射Rayleigh波　； 參考：《中北大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年02期

【摘要】：針對金屬構(gòu)件表面微小缺陷非接觸式定量檢測的難題,采用有限元法模擬了激光超聲波與不同深度的表面缺陷的相互作用,研究了瑞利透射波的時(shí)域和頻域特征與表面缺陷深度的關(guān)系.通過分析時(shí)域和頻域特征的產(chǎn)生機(jī)制,提取出"TR波的到達(dá)時(shí)間"、"TR波峰峰值"、"TRS波的到達(dá)時(shí)間"、"透射波極限頻率"4個(gè)與缺陷深度相關(guān)的特征量,并得出了"TRS波的到達(dá)時(shí)間"特征量與表面缺陷深度的數(shù)學(xué)關(guān)系表達(dá)式.結(jié)果表明:"TRS波到達(dá)時(shí)間"特征量與表面缺陷深度呈線性增加關(guān)系,"透射波極限頻率"特征量與表面缺陷深度呈非線性單調(diào)遞減關(guān)系,可利用這兩個(gè)特征量進(jìn)行表面缺陷深度的定量表征.
[Abstract]:In order to solve the problem of non-contact quantitative detection of micro-defects on the surface of metal members, the interaction between laser ultrasonic wave and surface defects of different depths was simulated by finite element method. The relationship between the characteristics of Rayleigh transmission waves in time domain and frequency domain and the depth of surface defects is studied. By analyzing the generation mechanism of time-domain and frequency-domain features, four characteristic quantities related to the depth of defects are extracted, such as "arrival time of tr wave", "peak value of tr wave peak", "arrival time of TRS wave" and "limit frequency of transmission wave". The mathematical expression between the characteristic quantity of "arrival time of TRS wave" and the depth of surface defect is obtained. The results show that the characteristic quantity of "TRS wave arrival time" increases linearly with the depth of the surface defect, and the characteristic quantity of "transmission wave limit frequency" shows a nonlinear monotone decreasing relationship with the depth of the surface defect. These two characteristics can be used to quantitatively characterize the depth of surface defects.
【作者單位】： 中北大學(xué)信息與通信工程學(xué)院;中北大學(xué)計(jì)算機(jī)與控制工程學(xué)院;
【基金】：教育部博士點(diǎn)基金聯(lián)合資助項(xiàng)目(2013142012007)
【分類號】：TN249

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