Fidelity of a Finite Element Model for Longitudinal Wave Propagation in Thick Cylindrical Wave Guides.

Technical Information Center Oak Ridge Tennessee

关键词: Finite element method;    Wave propagation;    Cylindrical bodies;    Theses;    Waveguides;   

RP-ID  :  PB2001103960

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The ability to model wave propagation in circular cylindrical bars of finite length numerically or analytically has many applications. In this thesis the capability of an explicit finite element method to model longitudinal waves in cylindrical rods with circular cross-sections is explored. Dispersion curves for the first four modes are compared to the analytical solution to determine the accuracy of various element sizes and time steps. Values for the time step and element size are determined that retain accuracy while minimizing computational time. The modeling parameters are validated by calculating a signal propagated with a broadband input force. Limitations on the applicability are con-sidered along with modeling parameters that should be applicable to more general geometries.