研究目的
To develop and validate a finite element model for simulating the multiphysical process of piezoelectric vibration energy harvesting using real-world vibration data, addressing gaps in existing literature.
研究成果
The proposed multiphysical FE model accurately simulates the dynamic response of piezoelectric vibration energy harvesting on composite structures using real-world vibration data, with experimental validation showing less than 10% deviation. It enables parametric studies for design optimization and is applicable to various industrial applications such as aerospace and automotive.
研究不足
The interpolation of vibration data may lose some information due to mathematical manipulation. Fabrication tolerances and material property uncertainties can cause deviations in results. The model's reliability decreases at low power levels (<0.1 mW) due to background noise. The study is limited to specific MFC and CFRP configurations and may not generalize to other materials or topologies.
1：Experimental Design and Method Selection:
A finite element model was developed using COMSOL Multiphysics software, combining solid mechanics, electrostatics, and electrical circuit physics. Eigenfrequency, time-dependent modal, and frequency domain modal studies were employed to analyze resonant frequencies, mode shapes, and responses. Vibration data from various applications were interpolated and used as dynamic loading.
2：Sample Selection and Data Sources:
A piezoelectric macro-fibre composite (MFC) transducer (M8525-P2 from Smart Material) integrated on a carbon fibre composite beam (60 mm width, 200 mm length) was used. Vibration data were measured from aerospace, automotive, engine, bridge, and rail applications using accelerometer data loggers.
3：List of Experimental Equipment and Materials:
COMSOL Multiphysics software, MFC transducer (M8525-P2, Smart Material), carbon fibre composite (RC200T), electrodynamic shaker, accelerometers, impedance box, digital oscilloscope, Agilent Waveform Editor, Agilent function/arbitrary wave generator, BKSV LDS electrodynamic shaker.
4：Experimental Procedures and Operational Workflow:
The FE model was set up with orthotropic material properties for MFC and CFRP. Vibration data files were imported using interpolation functions. The model was solved for mechanical and electrical responses. Experimental validation involved mounting the prototype on a shaker, applying sine wave and vibration data excitations, and measuring outputs.
5：Data Analysis Methods:
Results were analyzed using FFT and STFT in MATLAB for frequency characteristics. Power output was calculated from RMS voltage across load resistance. Damping ratios were fitted from experimental data.
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COMSOL Multiphysics
COMSOL
Finite element software used for simulating multiphysical processes including solid mechanics, electrostatics, and electrical circuits.
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MFC transducer
M8525-P2
Smart Material
Piezoelectric macro fibre composite used for energy harvesting, sensing, and actuation on carbon fibre composite structures.
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Carbon fibre composite
RC200T
Base material for the composite beam structure in the energy harvesting device.
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Electrodynamic shaker
BKSV LDS
BKSV
Used to mechanically excite the prototype device for experimental validation.
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Accelerometer data logger
Gulf Coast Data Concepts
Used to measure and log vibration data from various environments for input into the FE model.
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Agilent Waveform Editor
Agilent
Software used to communicate vibration data to the arbitrary wave generator for experimental excitation.
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Agilent function/arbitrary wave generator
Agilent
Used to program the electrodynamic shaker with vibration data traces for experimental testing.
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Digital oscilloscope
Used to measure electrical outputs such as voltage from the energy harvesting device.
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Impedance box
Used to set and measure load resistance for power output calculations in experiments.
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