基于COMSOL仿真的电磁超声压电接收技术在铝板裂纹检测中的应用研究,COMSOL模拟：电磁超声压电接收技术在铝板裂纹检测中的应用,comsol电磁超声压电接收EMAT在1mm厚铝板中激励250kH
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基于COMSOL仿真的电磁超声压电接收技术在铝板裂纹检测中的应用研究,COMSOL模拟：电磁超声压电接收技术在铝板裂纹检测中的应用,comsol电磁超声压电接收EMAT在1mm厚铝板中激励250kHz的电磁超声在200mm位置处设置一个深0.8mm的裂纹缺陷，左端面设为低反射边界。在85mm位置处放置一个压电片接收信号，信号如图3所示，三个波分别为始波，裂纹反射波(S0模态)和右端面回波(S0）。,comsol;电磁超声;压电接收;EMAT;裂纹缺陷;信号接收;波;始波;S0模态;右端面回波,电磁超声检测技术：裂纹缺陷定位与信号分析 <link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/base.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/90405419/2/raw.css" rel="stylesheet"/><div id="sidebar" style="display: none"><div id="outline"></div></div><div class="pf w0 h0" data-page-no="1" id="pf1"><div class="pc pc1 w0 h0"><img alt="" class="bi x0 y0 w1 h1" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/90405419/bg1.jpg"/><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">标题<span class="ff2">：</span>基于<span class="_ _0"> </span><span class="ff3">COMSOL<span class="_ _1"> </span></span>的电磁超声压电接收<span class="ff2">（<span class="ff3">EMAT</span>）</span>技术在铝板缺陷检测中的应用研究</div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">摘要<span class="ff2">：</span>本文以<span class="_ _0"> </span><span class="ff3">COMSOL<span class="_ _1"> </span></span>为工具<span class="ff2">，</span>研究了电磁超声压电接收<span class="ff2">（<span class="ff3">EMAT</span>）</span>技术在<span class="_ _0"> </span><span class="ff3">1mm<span class="_ _1"> </span></span>厚铝板中的应用<span class="ff4">。</span>通</div><div class="t m0 x1 h2 y3 ff1 fs0 fc0 sc0 ls0 ws0">过在<span class="_ _0"> </span><span class="ff3">200mm<span class="_ _1"> </span></span>位置设置一个深<span class="_ _0"> </span><span class="ff3">0.8mm<span class="_ _1"> </span></span>的裂纹缺陷<span class="ff2">，</span>左端面设为低反射边界<span class="ff2">，</span>并在<span class="_ _0"> </span><span class="ff3">85mm<span class="_ _1"> </span></span>位置放置压电</div><div class="t m0 x1 h2 y4 ff1 fs0 fc0 sc0 ls0 ws0">片接收信号<span class="ff4">。</span>通过分析始波<span class="ff4">、</span>裂纹反射波<span class="ff2">（<span class="ff3">S0<span class="_ _1"> </span></span></span>模态<span class="ff2">）</span>和右端面回波<span class="ff2">（<span class="ff3">S0</span>）</span>的波形<span class="ff2">，</span>对铝板缺陷进行</div><div class="t m0 x1 h2 y5 ff1 fs0 fc0 sc0 ls0 ws0">检测和分析<span class="ff4">。</span></div><div class="t m0 x1 h2 y6 ff3 fs0 fc0 sc0 ls0 ws0">1.<span class="_ _2"> </span><span class="ff1">引言</span></div><div class="t m0 x1 h2 y7 ff1 fs0 fc0 sc0 ls0 ws0">电磁超声技术是一种非接触<span class="ff4">、</span>非破坏性的测试方法<span class="ff2">，</span>广泛应用于金属材料的缺陷检测和评估<span class="ff4">。</span>其中<span class="ff2">，</span></div><div class="t m0 x1 h2 y8 ff1 fs0 fc0 sc0 ls0 ws0">电磁超声压电接收<span class="ff2">（<span class="ff3">EMAT</span>）</span>技术具有操作简便<span class="ff4">、</span>信号清晰等优点<span class="ff2">，</span>逐渐成为研究热点<span class="ff4">。</span>本文以</div><div class="t m0 x1 h2 y9 ff3 fs0 fc0 sc0 ls0 ws0">COMSOL<span class="_ _1"> </span><span class="ff1">为工具<span class="ff2">，</span>通过激励<span class="_ _0"> </span></span>250kHz<span class="_ _1"> </span><span class="ff1">的电磁超声<span class="ff2">，</span>在<span class="_ _0"> </span></span>1mm<span class="_ _1"> </span><span class="ff1">厚铝板中设置裂纹缺陷<span class="ff2">，</span>探讨了<span class="_ _0"> </span></span>EMAT<span class="_ _1"> </span><span class="ff1">技术</span></div><div class="t m0 x1 h2 ya ff1 fs0 fc0 sc0 ls0 ws0">在铝板缺陷检测中的应用<span class="ff4">。</span></div><div class="t m0 x1 h2 yb ff3 fs0 fc0 sc0 ls0 ws0">2.<span class="_ _2"> </span><span class="ff1">研究方法</span></div><div class="t m0 x1 h2 yc ff3 fs0 fc0 sc0 ls0 ws0">2.1.<span class="_"> </span><span class="ff1">建立模型</span></div><div class="t m0 x1 h2 yd ff1 fs0 fc0 sc0 ls0 ws0">基于<span class="_ _0"> </span><span class="ff3">COMSOL<span class="ff2">，</span></span>建立了一个<span class="_ _0"> </span><span class="ff3">1mm<span class="_ _1"> </span></span>厚铝板模型<span class="ff4">。</span>在模型中<span class="ff2">，</span>设置<span class="_ _0"> </span><span class="ff3">200mm<span class="_ _1"> </span></span>位置处的裂纹缺陷<span class="ff2">，</span>深度为</div><div class="t m0 x1 h2 ye ff3 fs0 fc0 sc0 ls0 ws0">0.8mm<span class="ff2">，<span class="ff1">并将左端面设为低反射边界<span class="ff4">。</span>在<span class="_ _0"> </span></span></span>85mm<span class="_ _1"> </span><span class="ff1">位置放置一个压电片<span class="ff2">，</span>用于接收信号<span class="ff4">。</span></span></div><div class="t m0 x1 h2 yf ff3 fs0 fc0 sc0 ls0 ws0">2.2.<span class="_"> </span><span class="ff1">激励信号</span></div><div class="t m0 x1 h2 y10 ff1 fs0 fc0 sc0 ls0 ws0">激励信号采用<span class="_ _0"> </span><span class="ff3">250kHz<span class="_ _1"> </span></span>的电磁超声波<span class="ff2">，</span>通过模型中的电磁超声源激发<span class="ff4">。</span></div><div class="t m0 x1 h2 y11 ff3 fs0 fc0 sc0 ls0 ws0">3.<span class="_ _2"> </span><span class="ff1">结果分析</span></div><div class="t m0 x1 h2 y12 ff1 fs0 fc0 sc0 ls0 ws0">通过<span class="_ _0"> </span><span class="ff3">COMSOL<span class="_ _1"> </span></span>仿真<span class="ff2">，</span>得到了始波<span class="ff4">、</span>裂纹反射波<span class="ff2">（<span class="ff3">S0<span class="_ _1"> </span></span></span>模态<span class="ff2">）</span>和右端面回波<span class="ff2">（<span class="ff3">S0</span>）</span>的波形<span class="ff4">。</span>根据波形特</div><div class="t m0 x1 h2 y13 ff1 fs0 fc0 sc0 ls0 ws0">征可以对铝板的缺陷进行检测和分析<span class="ff4">。</span></div><div class="t m0 x1 h2 y14 ff3 fs0 fc0 sc0 ls0 ws0">3.1.<span class="_"> </span><span class="ff1">始波</span></div><div class="t m0 x1 h2 y15 ff1 fs0 fc0 sc0 ls0 ws0">始波是指电磁超声波从激发源发射至铝板表面时的波形<span class="ff4">。</span>始波的特征对应着激发源的信号特性<span class="ff2">，</span>我们</div><div class="t m0 x1 h2 y16 ff1 fs0 fc0 sc0 ls0 ws0">可以通过分析始波的振幅和频谱信息<span class="ff2">，</span>了解激发源的性能以及能量传输情况<span class="ff4">。</span></div><div class="t m0 x1 h2 y17 ff3 fs0 fc0 sc0 ls0 ws0">3.2.<span class="_"> </span><span class="ff1">裂纹反射波<span class="ff2">（</span></span>S0<span class="_ _1"> </span><span class="ff1">模态<span class="ff2">）</span></span></div><div class="t m0 x1 h2 y18 ff1 fs0 fc0 sc0 ls0 ws0">裂纹反射波是指电磁超声波在裂纹处反射产生的波形<span class="ff4">。</span>裂纹反射波的特征对应着缺陷的位置和形态<span class="ff2">，</span></div><div class="t m0 x1 h2 y19 ff1 fs0 fc0 sc0 ls0 ws0">通过分析裂纹反射波的振幅和时间</div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>