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Computation of plate wave dispersion diagrams and surface wave velocities without explicit boundary conditions

机译:在没有明确边界条件的情况下计算板波频散图和面波速度

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We discuss the computation of the band structure of plate waves using the plane wave expansion (PWE) method. This method is generally used to formulate eigenvalue problems to compute dispersion diagrams for solid-solid phononic crystals. We show how the free surface boundary condition can be included implicitly in the form of the PWE solution, thus leading to an efficient eigenvalue problem. This generic method for wave dispersion is non-iterative and does not require an initial guess for the solution. Furthermore, surface acoustic wave velocities can be estimated from the slowest wave for large wave vectors. Examples for a single plate and a multilayer plate are given, and extension to piezoelectric materials is discussed.
机译:我们讨论了使用平面波扩展(PWE)方法计算板波的能带结构。该方法通常用于公式化特征值问题,以计算固体-固体声子晶体的色散图。我们展示了如何以PWE解的形式隐式包含自由表面边界条件,从而导致有效的特征值问题。这种用于波色散的通用方法是非迭代的,不需要对解决方案进行初步猜测。此外,对于大的波矢,可以从最慢的波估计声表面波的速度。给出了单板和多层板的示例,并讨论了压电材料的扩展。

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