Number of Wavevectors for Each Frequency in a Periodic Structure

[+] Author and Article Information
Farhad Farzbod

ASME Member Assistant Professor, University of Mississippi 201A Carrier Hall, University, MS 38677

1Corresponding author.

ASME doi:10.1115/1.4036466 History: Received September 06, 2016; Revised March 16, 2017


Periodic structures have interesting acoustic and vibration properties making them suitable for a wide variety of applications. In a periodic structure, the number of frequencies for each wavevector depends on the degree of freedom of the unit cell. In this paper, we investigate the number of wavevectors for each frequency. This analysis defines the upper bound for the maximum number of wavevectors for each frequency in a general periodic structure which might include damping. Investigation presented in this paper can also provide an insight for designing materials in which the interaction between unit cells is not limited to the closest neighbor. As an example application of this work, we investigate phonon dispersion curves in hexagonal form of Boron Nitride to show that first neighbor interaction is not sufficient to model dispersion curves with force-constant-model.

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