Abstract
In order to meet the requirements of airflow vibration piezoelectric generator, and solve the critical issue of stable excitation force, the key is to effectively control structure sensitive parameters. The range of structural parameters of airflow excitation device are optimized by simplified orthogonal test. The result shows that corresponding to different resonator lengths, it approximates a linear increasing trend between the amplitude of excitation force and airflow velocity, and the greater length owns the smaller slope, and vice versa. It is relatively complex for the space and ring gaps, too big or too small gap would make the amplitude smaller or even no waveform formed. The length of resonator is the main factor impacting on the frequency of excitation sound pressure, and the frequency decreases with the increase of the length, presenting an inverse relationship, and the space and ring gaps have less effect on the frequency. Therefore, for high airflow velocity, the stable excitation force of high amplitude and frequency can be obtained by short resonator. In addition, reasonable space and ring gaps are also important for ensuring bigger amplitude of excitation sound pressure. The resulting sensitive parameter values of sound excitation device can be used as references for engineering design.
Highlights
As the miniaturized development trend of aircrafts, small physical powers supplied complicated application systems of microelectronics system are desperately needed
According to the principle of frequency pump [7], Zou Hua-Jie et al designed a small structure of the airflow vibration piezoelectric generator based on the structure of nozzle-resonator, which is composed of an ISSN PRINT 1392-8716, ISSN ONLINE 2538-8460, KAUNAS, LITHUANIA
The range of structural parameters of airflow excitation device are optimized by simplified orthogonal test method to ensure good waveform with high amplitude and frequency
Summary
As the miniaturized development trend of aircrafts, small physical powers supplied complicated application systems of microelectronics system are desperately needed. Xu Wei et al have studied the vibration displacement response of the piezoelectric and the output voltage of the generator by simulation [4] He Peng designed an air-inlet with airflow conditioning function and analyzed the flow field inner the inlet [5]. They focused on the process of acoustic excitation induced by airflow and studied the operational principle and characterization of airflow-induced acoustic excitation through simulation and experiment [8]. They studied the characterization of the output power by measuring output voltage across the road and calculating related electrical [9] They analyzed the fixed method of the piezoelectric transducer [10]. The range of structural parameters of airflow excitation device are optimized by simplified orthogonal test method to ensure good waveform with high amplitude and frequency
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