Airflow-induced acoustic piezoelectric power generation forced vibration device

Abstract

The invention provides an airflow-induced acoustic piezoelectric power generation forced vibration device, which comprises a vibration structure and a piezoelectric transducer, wherein the vibration structure comprises an air inlet, a nozzle and an acoustic pipe; the piezoelectric transducer is fixed at the bottom part of the acoustic pipe; one end of a housing and a plug form the air inlet; an inner hole of the nozzle is a variable-section contracting airway; the acoustic pipe and a piezoelectric plate are sequentially arranged at the other end of the housing and are fixedly connected with the housing through an outer end cover board; the piezoelectric plate is pressed at the tail end of the acoustic pipe; and a hollow cavity is reserved between the nozzle and the acoustic pipe. By the change characteristic generated by airflow after flowing through a pipeline and the characteristic of structure vibration caused by acoustic wave propagation in the hollow cavity and a pipe hole, the novel airflow-induced acoustic piezoelectric power generation forced vibration device free of a moving part provided by the invention comprises a forced vibrating mechanical system for mechanically self-modulating an airflow-excited fluid power sound source, meets the self-powered requirements of application systems in various fields of automobiles, unmanned vehicles, weapon application systems, aerospace systems, robots, urban or residential lighting and the like, improves clean renewable energy sources and has important theoretical value and guidance significance for engineering.

Description

technical field [0001] The invention provides a forced vibration device for airflow-induced acoustic piezoelectric power generation, which relates to a device that utilizes a fluid dynamic sound source that induces sound waves by airflow and excites a piezoelectric transducer to output electric energy, and belongs to the technical field of airflow piezoelectric power generation. Background technique [0002] The vibration source comes from the vibrating piezoelectric generator of wind and airflow in the environment, which is a clean and renewable energy source. The power supply system that stimulates the natural wind in the working environment (or the airflow generated by the head-on air) has a low wind speed, ranging from 1 to 10m / s, that is, breezes and gentle winds of grades 1 to 5, and the generators use horizontal or vertical axes. Turbine-type rotating structure, relying on the wind or airflow to directly drive the turbine blades to rotate and excite the magnetoelectri...

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Problems solved by technology

This invention relies on a linearly moving piston mechanism to adjust the airflow and the cantilever beam piezoelectric array. Similarly, there are problems of low system strength, poor anti-interference, complex structure, and large volume.

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