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首页> 外文会议>19th International conference on adaptive structures and technologies 2008 >Maximizing the Excitation Strength at Specific Resonance Frequencies of Functionally Graded Piezoelectric Transducers
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Maximizing the Excitation Strength at Specific Resonance Frequencies of Functionally Graded Piezoelectric Transducers

机译：功能梯度压电换能器在特定共振频率下的激励强度最大化

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An important parameter in piezoelectric transducer design is to maximize the strength of a specific resonance when a voltage is applied across the electrodes. In this work, it is proposed a new approach to design piezoelectric transducer based on the maximization of the excitation strength of user-defined modes. Here, the piezoelectric transducer is designed based on Functionally Graded Material (FGM) concept (named Functionally Graded Piezoelectric Transducers (FGPT)). FGM are composite advanced materials, which are made by changing gradually the properties with position inside material domain. In this work, Topology Optimization Method (TOM) is applied to find the optimal gradation function that maximizes the excitation strength of desirable modes. The Piezoelectric Modal Constant (PMC) is considered to quantify the excitation strength of a specific mode. The main goal is to maximize a specified PMC of a specific FGPT mode by finding the optimal material distribution subjected to a given volume constraint. In addition, the FGPT is required to oscillate in a thickness extensional mode (aiming acoustic wave generation applications); thus, to track the desirable mode a mode-tracking method based on the Modal Assurance Criterion (MAC) is applied. The optimization algorithm is constructed based on Sequential Linear Programming (SLP), and the concept of the Continuum Approximation of Material Distribution (CAMD) is considered. To illustrate the method, two-dimensional FGPT are designed considering plane strain assumption. The result shows the advantage of using FGM concept and TOM to design piezoelectric transducers. The desired PMC is increased more than 60%. In addition, the target mode is achieved by using an accurate mode-tracking strategy.
机译：压电换能器设计中的一个重要参数是当在电极之间施加电压时，最大化特定共振的强度。在这项工作中，提出了一种基于最大化用户定义模式的激励强度来设计压电换能器的新方法。在此，压电换能器是基于功能梯度材料（FGM）概念（称为功能梯度压电传感器（FGPT））设计的。 FGM是复合高级材料，是通过逐渐改变材料在材料域内的位置而制成的。在这项工作中，使用拓扑优化方法（TOM）来找到使所需模式的激发强度最大化的最佳灰度函数。压电模态常数（PMC）被认为可以量化特定模式的激发强度。主要目标是通过找到在给定体积约束下的最佳材料分布来最大化特定FGPT模式的指定PMC。另外，要求FGPT以厚度扩展模式振动（针对声波产生应用）；因此，为了跟踪期望的模式，应用了基于模态保证标准（MAC）的模式跟踪方法。基于顺序线性规划（SLP）构造优化算法，并考虑了材料分布的连续近似（CAMD）的概念。为了说明该方法，在考虑平面应变假设的情况下设计了二维FGPT。结果显示了使用FGM概念和TOM设计压电传感器的优势。所需的PMC增加超过60％。另外，目标模式是通过使用精确的模式跟踪策略来实现的。

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