A tunable piezoelectric energy harvester coupled with wing flutter and vortex induced vibration

Abstract

The invention relates to a wing flutter and vortex-induced vibration coupled and tunable piezoelectric energy harvester, belongs to the technical field of air flow-induced vibration energy harvesting,and solves the problems that an existing energy harvester is suitable for a single wind speed, low in harvested energy and difficult to popularize and apply. One ends of plate springs are connected with fixed supports, and the other ends of the plate springs are adjustably connected with one ends of the supports, so that the effective working length can be adjusted; the other ends of the supportsare provided with an elastic shaft, and the windward side of a wing is adjustably connected with the supports through the elastic shaft, so that an aerodynamic force and a torque transmitted to the plate springs by the wing are changed; the tail edge of the wing is provided with a cantilever beam; the free end of the cantilever beam is connected with a pin fin; and the two plate springs and the cantilever beam are provided with piezoelectric plates. According to the energy harvester, the effective working length of the plate springs and the mounting positions of the elastic shaft and the wingcan be arbitrarily adjusted, the flutter generation conditions of the wing are changed, and the vortex-induced vibration generated by the pin fin is coupled, so that the energy harvesting performanceand efficiency are improved; and the energy harvester can be widely applied to the air flow-induced vibration energy harvesting in a micro-wing type aircraft or a complicated and changeable wind field.

Description

Technical field [0001] The invention relates to a piezoelectric energy harvester, in particular to a tunable piezoelectric energy harvester coupled with wing flutter and vortex-induced vibration, belonging to the technical field of air flow induced vibration energy harvesting. Background technique [0002] When a miniature airfoil aircraft is cruising, its wings are prone to aeroelastic vibration. When the flight speed exceeds or approaches the flutter start speed, the wings will flutter. Flutter is a large-amplitude-self-excitation unstable phenomenon, which contains huge vibration energy and can even cause damage to aircraft. On the one hand, it can use the aeroelastic vibration energy of the wings for piezoelectric energy capture, which can continuously supply energy for microelectromechanical systems such as wireless sensors to monitor the working conditions of the aircraft; on the other hand, it can also use the energy capture characteristics to change or suppress aeroelast...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a tunable piezoelectric energy harvester coupled with wing flutter and vortex-induced vibration to solve the problems of piezoelectric energy harvesters that are difficult to be popularized and applied in practical engineering, poor energy harvesting performance, and single excitation vibration form. The problem

Images