Abstract
The paper studies the influence of piezoelectric materials and structural parameters on the electromechanical conversion characteristics of the piezoelectric vibrator. Employing the mechanical theory of Euler–Bernoulli beam, the mechanical vibration and circuit balance equation are obtained about the single-step variable cross-section bimorph piezoelectric vibrator under the condition of external resistance, and the analytical equations are derived for the displacement, output voltage, and conversion efficiency of the piezoelectric vibrator excited by near natural frequency simple harmonic support. The validity of the theoretical model is verified by vibration test. Theoretical analysis and experimental results show that the mechanical and electrical conversion efficiency of the piezoelectric vibrator is the highest when the circuit impedance is matched, and the mechanical and electrical conversion efficiency of the piezoelectric vibrator is determined by the resistance ratio caused by mechanical and electrical coupling after resistance optimization.
Highlights
Oscillating float wave force structure can obtain energy by means of the oscillating motion of the floating body on the sea surface under the action of waves, which is easy to be combined with various forms of transmission and power generation systems. ere are many energy conversion modes, and the oscillating float is the most suitable type of wave energy device to combine with piezoelectric power generation to realize continuous power supply for offshore equipment. e pendulum device is more suitable for wave energy utilization in shallow water near shore
The analytical equations are derived about the displacement, output voltage, and conversion efficiency of the piezoelectric vibrator under the condition of natural frequency simple harmonic support based on the mechanical theory of Euler–Bernoulli beam, and the validity of the theoretical model is verified by vibration test
Based on the Euler–Bernoulli beam theory, the paper presented the structural vibration equation and the circuit balance equation of the piezoelectric vibrator with external pure resistance. e analytical expressions of the vibration response and the voltage at both ends of the external resistance are obtained by employing the modal method under the condition of the near natural frequency bearing simple harmonic vibration, and the model is verified by experiments. e following conclusions are drawn: (1) eoretical analysis shows that when the circuit impedance is matched, the electromechanical conversion efficiency of the piezoelectric vibrator is the highest, and the electromechanical conversion efficiency of the piezoelectric vibrator after resistance optimization is determined by the ratio of the electric damping caused by electromechanical coupling to the total damping of the vibrator
Summary
Oscillating float wave force structure can obtain energy by means of the oscillating motion of the floating body on the sea surface under the action of waves, which is easy to be combined with various forms of transmission and power generation systems. ere are many energy conversion modes, and the oscillating float is the most suitable type of wave energy device to combine with piezoelectric power generation to realize continuous power supply for offshore equipment. e pendulum device is more suitable for wave energy utilization in shallow water near shore. Ere are many energy conversion modes, and the oscillating float is the most suitable type of wave energy device to combine with piezoelectric power generation to realize continuous power supply for offshore equipment. E research on the oscillating float wave piezoelectric power generation device can better promote the application of the existing offshore equipment technology. E maximum wave energy conversion power obtained by the floating body exists in the upper Budal limit [13, 14]. The analytical equations are derived about the displacement, output voltage, and conversion efficiency of the piezoelectric vibrator under the condition of natural frequency simple harmonic support based on the mechanical theory of Euler–Bernoulli beam, and the validity of the theoretical model is verified by vibration test
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