研究目的
Investigating the power flow and scattering in a straight-helical-straight waveguide structure using the wave and finite element (WFE) method.
研究成果
The WFE method is used to study power scattering in a straight-helical-straight waveguide structure. The wave behavior of each waveguide is resolved using the WFE method and the wavemodes are used to formulate power flow, reflection and transmission. In the three examples presented, a common observation is made: power is largely reflected at low frequencies and largely transmitted at higher frequencies. This is explained by examining the dispersion curves of the straight and helical waveguides.
研究不足
The technical and application constraints of the experiments include the complexity of waveguides with noncanonical cross-sections, where analytical models are challenging to obtain. Potential areas for optimization include the FE discretization and the selection of wave pairs retained in the WFE model.
1：Experimental Design and Method Selection:
The WFE method is used to model the wave behavior in each waveguide in the structure. The power flow is studied by considering how waves reflect and transmit at the boundaries that join the straight waveguides with the helical waveguide.
2：Sample Selection and Data Sources:
Three numerical examples are presented: an isotropic beam with circular cross-section, a composite beam, and a steel pipework.
3：List of Experimental Equipment and Materials:
The FE model of the segment is obtained using either in-house or commercial FE software packages. For the composite beam example, SOLID45 elements of the ANSYS software package are used.
4：Experimental Procedures and Operational Workflow:
The WFE method is based on post-processing the FE model of a small segment of a waveguide. The segment’s length must be chosen such that FE discretization errors and rounding errors are minimized.
5：Data Analysis Methods:
The power flow is studied by considering how waves reflect and transmit at the boundaries that join the straight waveguides with the helical waveguide. The power reflection and transmission matrices are defined and used to analyze the power flow.
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