Lamb Wave Mode Decomposition
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<p style="text-align: center;"><img alt="" src="/resources/150/download/Overview.JPG" style="height:300px; width:500px" /></p> <p><strong>Abstract.</strong> Lamb waves using surface-bonded piezoelectric transducers (PZTs) have been widely used for nondestructive testing (NDT). However, the identification of individual Lamb wave modes and the subsequent data interpretation are often difficult due to the dispersive and multimodal natures of Lamb waves. To tackle the problem, a Lamb wave mode decomposition technique using concentric ring and circular PZTs is proposed. Its advantages over the conventional approaches are that (1) PZTs need to be placed only a single surface of a specimen and (2) mode decomposition can be performed at any desired frequency without changing the PZT size and/or spacing configuration. The proposed mode decomposition technique is formulated by solving 3D Lamb wave propagation equations considering the PZT size and shape, and this technique requires a specially designed dual PZT composed of concentric ring and circular PZTs. The effectiveness of the proposed technique for the Lamb wave mode decomposition is investigated through numerical simulation and experimental tests performed on an aluminum plate.</p> <p><span style="background-color:rgb(255, 255, 255); color:rgb(34, 34, 34); font-family:arial,sans-serif; font-size:13px; font-style:normal; font-variant:normal; line-height:16.1200008392334px">Reference:&nbsp;Yeum, Chul Min, Hoon Sohn, and Jeong Beom Ihn. &quot;Lamb wave mode decomposition using concentric ring and circular piezoelectric transducers.&quot;</span><em style="background-color:rgb(255, 255, 255); color:rgb(34, 34, 34); font-family:arial,sans-serif; font-size:13px; font-variant:normal; line-height:16.1200008392334px">Wave motion</em><span style="background-color:rgb(255, 255, 255); color:rgb(34, 34, 34); font-family:arial,sans-serif; font-size:13px; font-style:normal; font-variant:normal; line-height:16.1200008392334px">&nbsp;48.4 (2011): 358-370.</span></p> <nb:citations></nb:citations>
<p style="text-align: center;"><img alt="" src="/resources/150/download/Overview.JPG" style="height:300px; width:500px" /></p> <p><strong>摘要.</strong> 采用表面粘接式压电传感器（piezoelectric transducers, PZTs）激发的兰姆波（Lamb waves）已被广泛应用于无损检测（nondestructive testing, NDT）领域。然而，由于兰姆波兼具频散特性与多模态特性，单一兰姆波模态的识别及后续数据解析往往颇具挑战。为解决该问题，本文提出一种基于同心环型与圆形压电传感器的兰姆波模态分解技术。相较于传统方法，该技术的优势在于：其一，仅需在试件的单一表面布设压电传感器；其二，无需调整压电传感器的尺寸与间距配置，即可在任意目标频率下完成模态分解。所提出的模态分解技术通过求解考虑压电传感器尺寸与形状的三维兰姆波传播方程构建而成，且该技术需采用由同心环型与圆形压电传感器组成的专用复合压电传感器。本文通过数值仿真与铝板上开展的实验测试，验证了所提兰姆波模态分解技术的有效性。</p> <p><span style="background-color:rgb(255, 255, 255); color:rgb(34, 34, 34); font-family:arial,sans-serif; font-size:13px; font-style:normal; font-variant:normal; line-height:16.1200008392334px">参考文献: </span><em style="background-color:rgb(255, 255, 255); color:rgb(34, 34, 34); font-family:arial,sans-serif; font-size:13px; font-variant:normal; line-height:16.1200008392334px">Yeum, Chul Min, Hoon Sohn, Jeong Beom Ihn</em><span style="background-color:rgb(255, 255, 255); color:rgb(34, 34, 34); font-family:arial,sans-serif; font-size:13px; font-style:normal; font-variant:normal; line-height:16.1200008392334px">. 《采用同心环型与圆形压电传感器的兰姆波模态分解技术》, 《波动》, 2011, 48(4): 358-370.</span></p> <nb:citations></nb:citations>
