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Purpose <p>In order to improve the efficiency of the electrostatic vibration energy harvester (EVEH) that captures the mechanical vibration energy to power low-power electronic devices, and demonstrate that electrostatic harvester is also able to serve as the vibration isolation device, this paper presents the model of the beam-type EVEH and the combination with the quasi-zero stiffness isolator (QZSI), respectively.</p> Method <p>The double-fixed straight beam and the cosine beam are employed to be the vibrator of the EVEH and their linear and nonlinear stiffness characteristics are compared. The electromechanical coupling equations are established by using the Newton’s second law and the Kirchhoff’s voltage law. To combine the function of energy harvesting and the vibration isolation, the quasi-zerostiffness balance condition is obtained which is determined by the relationships among the electrostatic force, the isolated mass and the stiffness of the cosine beam and the spring. By controlling the gap and the voltage between the plates of the capacitor, the electrostatic force is balanced with the isolated mass, and then the vibration isolation system achieves the equilibrium for the QZSI.&#xa0;The system parameters for the cosine beam-EVEH are also optimized by the response surface analysis.</p> Results <p>The influence of several system parameters on the performance and the output characteristics of the devices are numerically analyzed, and the results for the straight beam- and cosine beam-type EVEHs are compared. While higher voltage and narrower gap is benefit for better performance of energy harvesting and vibration isolating, the appropriate value of the resistance can both lead to high energy harvesting performance at low frequencies and effective isolation for high-frequency vibration. Additionally, the electrostatic force can further reduce the stiffness and resonance frequency of the system.</p> Conclusion <p>The EVEH with cosine beam, in contrast to the straight beam, exhibits bistable nonlinear characteristics, which can increase the output power, broaden the frequency band, and even maintain good performance with a lager external excitation. The EVEH can be combine with the QZSI, and the electrostatic force balanced with the force from the isolated mass can significantly reduce the initial isolation frequency.</p>

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Design and Analysis of a Beam-Type Electrostatic Energy Harvester and the Integration with the Quasi-Zero Stiffness Vibration Isolation

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • D. S. Zhang,
  • X. Peng

摘要

Purpose

In order to improve the efficiency of the electrostatic vibration energy harvester (EVEH) that captures the mechanical vibration energy to power low-power electronic devices, and demonstrate that electrostatic harvester is also able to serve as the vibration isolation device, this paper presents the model of the beam-type EVEH and the combination with the quasi-zero stiffness isolator (QZSI), respectively.

Method

The double-fixed straight beam and the cosine beam are employed to be the vibrator of the EVEH and their linear and nonlinear stiffness characteristics are compared. The electromechanical coupling equations are established by using the Newton’s second law and the Kirchhoff’s voltage law. To combine the function of energy harvesting and the vibration isolation, the quasi-zerostiffness balance condition is obtained which is determined by the relationships among the electrostatic force, the isolated mass and the stiffness of the cosine beam and the spring. By controlling the gap and the voltage between the plates of the capacitor, the electrostatic force is balanced with the isolated mass, and then the vibration isolation system achieves the equilibrium for the QZSI. The system parameters for the cosine beam-EVEH are also optimized by the response surface analysis.

Results

The influence of several system parameters on the performance and the output characteristics of the devices are numerically analyzed, and the results for the straight beam- and cosine beam-type EVEHs are compared. While higher voltage and narrower gap is benefit for better performance of energy harvesting and vibration isolating, the appropriate value of the resistance can both lead to high energy harvesting performance at low frequencies and effective isolation for high-frequency vibration. Additionally, the electrostatic force can further reduce the stiffness and resonance frequency of the system.

Conclusion

The EVEH with cosine beam, in contrast to the straight beam, exhibits bistable nonlinear characteristics, which can increase the output power, broaden the frequency band, and even maintain good performance with a lager external excitation. The EVEH can be combine with the QZSI, and the electrostatic force balanced with the force from the isolated mass can significantly reduce the initial isolation frequency.