研究目的
To develop an analytical model of a piezoelectric vibration energy harvester with a Brinson shape memory alloy plate for tuning the resonant frequency by varying temperature to match excitation frequency and maximize power output.
研究成果
The study successfully develops an electromechanical coupled model for a PZT energy harvester with SMA, demonstrating that varying the temperature of SMA can tune the natural frequency by approximately 25% for the first three vibration modes. This tuning allows the harvester to match excitation frequencies, maximizing power output. The model includes damping effects and shows consistent behavior across different load resistances. Future work could address layer bonding defects and extend to 3D analyses.
研究不足
The analysis assumes perfect bonding between layers and neglects defects such as cracks or delamination. It is limited to one-dimensional bending stress and does not consider other stress components, which could be extended to 3D cases. External damping is neglected, and the model is theoretical without experimental validation.
1：Experimental Design and Method Selection:
The study uses an analytical modeling approach based on Euler-Bernoulli beam theory to derive electromechanically coupled equations for a composite cantilever beam consisting of PZT, substructure, and SMA layers. The Brinson model is employed to represent the SMA's phase transformation behavior with temperature and stress.
2：Sample Selection and Data Sources:
Material properties and dimensions are specified in Table 1, including properties for nitinol SMA, PZT-5A, and aluminum substructure. No experimental samples or datasets are used; it is a theoretical analysis.
3：List of Experimental Equipment and Materials:
No specific equipment or materials are listed as the study is analytical; properties are based on literature values (e.g., Brinson 1993).
4：3).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The methodology involves deriving governing equations for beam motion and electrical output, solving for frequency response functions (FRFs) of voltage, current, and power under harmonic base excitation, and conducting parametric studies with varying temperatures (20°C, 30°C, 40°C) and load resistances (100 Ω and 1 MΩ).
5：Data Analysis Methods:
Analytical solutions are obtained for modal responses; FRFs are plotted and analyzed to observe shifts in resonant frequencies and output characteristics. Damping ratios are considered (n1=0.01, n2=0.012, n3=0.03).
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