研究目的
Investigating the design and active control of an elastic wave metamaterial with electrically switchable properties for tuning the propagation direction of flexural waves.
研究成果
The study successfully demonstrates the active control of switchable waveguide properties in elastic wave metamaterials using piezoelectric patches and negative capacitance circuits, supported by both numerical simulations and experimental results.
研究不足
The experimental testing system cannot present the displacement distribution field like the numerical results, limiting the analysis to acceleration signals at certain points.
1：Experimental Design and Method Selection:
The study involves designing an elastic wave metamaterial with a T-shaped waveguide using 3D printing technology and employing an active control system with piezoelectric patches connected by negative capacitance circuits to tune the propagation direction of flexural waves.
2：Sample Selection and Data Sources:
The structure consists of a thin resin plate with periodic arrangement of surface-bonded hollow cylinders, fabricated using 3D printing technology.
3：List of Experimental Equipment and Materials:
Includes piezoelectric patches, negative capacitance circuits, operational amplifier LM324N, and a 3D printed waveguide structure.
4：Experimental Procedures and Operational Workflow:
The propagation properties of elastic waves are simulated using finite element software COMSOL, followed by experimental validation with the fabricated model.
5：Data Analysis Methods:
The mean stress on the left and right sides of the waveguide is calculated to analyze the propagation direction of elastic waves.
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