Controllable piezoelectric generator based on vortex-induced vibration principle

Abstract

The invention relates to a controllable piezoelectric generator based on the vortex-induced vibration principle. A vortex-induced vibration capture system comprises a fixed truss, a cylindrical bluntbody and a movable truss. The mounting groove of the fixed truss is provided with a first nonlinear spring and a second nonlinear spring which are arranged vertically. The upper end of the first nonlinear spring is fixedly connected with the movable truss, and the lower end is fixedly connected with the end part of the cylindrical blunt body. The lower end of the second nonlinear spring is fixedlyconnected with the lower end surface of the mounting groove, and the upper end is fixedly connected with the end part of the cylindrical blunt body. The periodic vortex-induced vibration of the bluntbody is utilized to convert the kinetic energy of water into mechanical energy, and the positive piezoelectric effect of a piezoelectric ceramic sheet is utilized to convert the mechanical energy into the electric energy, thereby avoiding large energy loss caused by the traditional power generation device in the mechanical transmission process. The blunt body is supported by the nonlinear springs, and the natural frequency of the structure can be changed conveniently to adapt to different flow velocity so that the blunt body is enabled to have locking resonance and achieve the maximum energycapture.

Description

technical field [0001] The invention relates to the technical field of development and utilization of marine renewable energy, in particular to a power generation device that utilizes vortex-induced vibration to drive a piezoelectric plate to vibrate to generate power. Background technique [0002] Electric energy is the main driving force for the development of science and technology and national economic growth, so power generation technology is particularly important. According to the statistics of the National Energy Administration in 2018, thermal power, hydropower, nuclear power, and wind power accounted for 75.08%, 13.15%, and 4.17%, 6.1%, thermal power is still the main power generation method in my country, but the reserve of fossil resources is limited and coal combustion will emit sulfur dioxide, carbon monoxide and other air pollutants, causing acid rain, smog and other natural disasters, and directly cause damage to the human body, Not conducive to the protection ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a vortex-induced vibration mechanism based on the principle of vortex-induced vibration for the problems of energy loss in mechanical transmission and the inability to resonate the blunt body in a locked state to obtain maximum energy conversion in the prior art. controlled piezoelectric generator

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