A Broadband Piezoelectric Energy Harvesting Method for Rotating Machinery

Abstract

The invention relates to a rotary machine broadband piezoelectric energy collecting method, which comprises the steps of: firstly, determining a mass relationship among a mass block, a cantilever beamand a piezoelectric piece; then assembling an assembled energy collecting mechanism; and finally, generating unidirectional rotational motion around the center of a rotary machine, and fixing a pedestal to the center of the rotary machine so as to drive other components to rotate along with. In the process, the mass block moves up and down periodically due to the action of gravity, the cantileverbeam and the piezoelectric piece deform along with vibration, an alternating voltage is generated by means of a piezoelectric effect, and then the alternating voltage is converted into electric energy by means of an energy harvesting circuit and stored in an energy storage device, so as to provide a sensor with energy. According to the rotary machine broadband piezoelectric energy collecting method, the cantilever beam and the mass block are arranged on the outer side of the rotary machine, the resonant frequency of the cantilever beam is changed by utilizing the change of a centripetal force, so that the resonance frequency is matched with a rotational speed, and the energy collection in a wide frequency band is realized.

Description

technical field [0001] The invention belongs to the technical field of energy conversion and collection, and in particular relates to a method for collecting broadband piezoelectric energy of a rotating machine. Background technique [0002] Rotating machinery is an important part of mechanical equipment, covering many engineering fields such as electric power, chemical industry, metallurgy, vehicles, and aviation. Rotating machinery generally runs at a high speed and is often a key piece of equipment, such as generators, steam turbines, rolling mills, car wheels, etc. Its working condition not only affects the operation of the equipment itself, but also has a direct impact on other components. When the failure is serious, it will cause major economic losses, and even cause accidents such as machine crashes and fatalities. [0003] Therefore, the structural health monitoring of rotating machinery is very important to detect faults in time and prevent major accidents. The s...

AI Technical Summary

Problems solved by technology

Energy is currently a bottleneck limiting wireless sensor applications

Traditional wireless sensors are powered by batteries and require frequent maintenance. For some occasions, they cannot meet the requirements of frequent maintenance.

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