Energy Harvesting And Vibration Characteristic Of A Piezo-Pneumatic Vibration Isolator

Our Research of piezoelectric energy harvesting mainly focuses on vibration energy recovery and the fluid energy generator. In this paper, we will use gas as a medium to transfer the vibration power. Based on gas’s advantages of compressibility and vibration absorption, gas will help improve the reliability of the piezoelectric energy, and, at the same time, harvest coupling vibration energy. When the resonance frequency of the piezoelectric power generating device close to the external excitation frequency resonant state is reached, energy harvesting operates in a more efficient and better way. The resonant frequency of the external environment is not fixed, so its resonant frequency changing with the external environment frequency structural parameters becomes extremely important. This paper presents a piezo-pneumatic isolator, with its power being transferred by gas. When piezoelectric and gas couple with each other, and with the additional back pressure, additional quality of the natural frequency of the piezoelectric oscillator can be adjusted to achieve low or wide band or high intensity of energy recovery. All the while, achieving an active vibration control effect.1. The background and significance of the piezo-pneumatic vibration isolator was initially introduced. We analyzed the present situation and recent development of the piezoelectric vibration/fluid generation technologies.2. The characteristics of circular double-crystal piezoelectric oscillator in the air was analyzed and tested. We established the equations of deformation and output voltage of the piezoelectric energy. We carried out relevant tests to obtain the characteristics of vibration and energy recovery in air environment.3. We introduced the model of the piezo-pneumatic vibration isolators, and thoroughly reviewed the structure and principle. Established a theoretical model of the piezo-pneumatic vibration isolator, using MAPLE and other simulation software to do the simulation analysis. By changing the external excitation frequency, system back pressure, added mass and other parameters, we explore the influence of various parameters on the isolators and vibration energy harvesting characteristics.4. Through experiments we verified the theoretical analysis and simulation of the piezo-pneumatic vibration isolator. Based on the proposed the structure and principles of piezo-pneumatic vibration isolators were designed and produced, other necessary parts, procurement, assembly and we set up the required experimental platform. Conducted research on isolator energy harvesting and damping characteristics:test different excitation frequencies, different system back pressure, additional tests of different mass and damping characteristics of the power generation performance and analyzed the influence of various factors on the performance of the isolator. The test results verify the correctness of the simulation results of the analysis.