Abstract
This paper aims at the power generation requirements of the fuze airflow-induced acoustic generator, analyzes the influence of structural parameters on the fluid power sound source, which is related to the power generation performance and use performance of the generator. In this paper, the orthogonal experiment method is used to study the sensitive parameters that control fluid dynamic sound sources. The results show that the annulus, the confronting distance, and cavity length can all have an impact on the sound pressure amplitude, and the sound pressure amplitude is most sensitive to the change of the confronting distance. However, the length of the resonant cavity has the most significant effect on the sound pressure frequency. The size of the annulus has a weak effect on the sound pressure frequency, and the confronting distance has almost no effect on the sound pressure frequency. The optimal combination scheme with the highest output power is selected according to the sensitive parameters. In addition, the empirical formula for the vibration frequency of the airflow-induced acoustic generator in the short resonant cavity was revised, and the influence of the annular gap on the vibration frequency was added, and the influence factor α = 0.3 was determined. The corrected frequency empirical formula has the smallest error between the theoretical value and the experimental value, and can be used as an effective method for estimating the vibration frequency. This provides a reference for the engineering design of the fuze airflow-induced acoustic generator, which has high military value and application prospects.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
The results show that the size of the annulus is the most sensitive parameter that affects the sound pressure amplitude, followed by the confronting distance and the length of the resonant cavity
The length of the resonant cavity is the most sensitive parameter that affects the sound pressure frequency, the size of the annulus is more sensitive to the sound pressure frequency, and the spacing has almost no effect on the sound pressure frequency
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The fluid dynamic sound source is a necessary condition for the fuze airflow-induced acoustic generator to generate electricity It is affected by the geometry of the resonant cavity and the incoming flow parameters [5]. The structural parameters and the incoming flow velocity of the fuze airflow-induced acoustic generator are the keys to the generation of the fluid dynamic sound source and the magnitude of the exciting force, which directly control the output performance of the generator. Through the orthogonal experimental method, we analyzed the influence law of multiple structural parameters of air flow induced acoustic generator on hydrodynamic sound source, determined its sensitive parameters, and put forward the optimization scheme of frequency formula. This paper first introduces the working principle of the fuze airflow-induced acoustic generator, analyzes the structural parameters that the airflow-induced generation of theacoustic hydroThis paper first introduces the working principle ofaffect the fuze dynamic sound source, obtains its sensitive parameters through orthogonal experiments, generator, analyzes the structural parameters that affect the generation of the hydroand proposes an obtains empirical scheme. orthogonal experiments, dynamic sound source, itsformula sensitiveoptimization parameters through and proposes an empirical formula optimization scheme
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