The Research On Resonant Frequency And Power Output Of Piezoelectricity Device

Piezoelectric cantilever generation device can convert mechanical energy into electricity directly. It has many advantages such as simple structure and high transformation efficiency, in addition, it is easy to process. This device can produce high voltage at resonance. Its natural frequency is largely related to dimensions and mechanical property of material. Appropriate plus impedance can promote it to product higher energy output. Therefore, researching on natural frequency and power output is very significant to increase the generation capacity.The paper is based on piezoelectric effect. Building the theoretical model basis of vibration mode and support mode. The piezoelectric ceramic PZT-5H is fabricated into a piezoelectric vibrator with different dimensions. Brass sheet, aluminum alloy and stainless steel are selected as metal substrate for different thickness. Using epoxy resin E51 and amide curing agent W93 mixture as binder. To test the nature frequency and power output of piezoelectric cantilever generation device.Combined with the theoretical model and experimental analysis, to start with three main factors which is the piezoelectric vibrator size, metal substrate size, and the type of metal substrate. Analyzing the change law natural frequency in different conditions. It is found that the natural frequency decreases with the length increase of piezoelectric vibrator and the metal material, linear increase with the increase of the thickness of the material. When the type of metal substrate changes, the natural frequency increases with the increase of the rigidity coefficient of the metal matrix. The conclusion is consistent with the theoretical deduction. The accuracy of the theory is verified, and the change law of natural frequency with structure size is summarized. It provides the bases for optimizing the structure size of the cantilever type piezoelectric device.The results of the energy output experiment show that the output voltage varies with the frequency, specific performance as the change trend of the first high and then decreased, and the size of the natural frequency can be judged by the change trend. The experimental study of the structure size is carried out. Summarizing the influence of the size of generating device on the generation capacity. From the change of power with the load can be clearly seen, The appropriate load impedance can greatly improve the output power.