Variable stiffness tuned piezoelectric energy harvester

Abstract

The invention relates to a variable stiffness tuned piezoelectric energy harvester. The energy harvester is composed of a variable stiffness tuning module and a piezoelectric energy harvesting module, and the variable stiffness tuning module is composed of a base, a piezoelectric ceramic block, a T-shaped hinge, a stiffness adjusting ring, a slider-crank compliant mechanism and the like. Based on the kinematics singularity principle of an additional spring slider-crank mechanism, when the mechanism starts to move from a kinematics non-singular position and passes through the singular position and then reaches the non-singular position, the rigidity of the mechanism has a positive-rigidity zero-rigidity negative-rigidity zero-rigidity positive-rigidity changing process. A rigid body replacement comprehensive method is adopted, the crank sliding block compliant mechanism with the variable stiffness characteristic is designed, the structure of the energy harvester is greatly simplified, the variable stiffness tuning characteristic of the crank sliding block compliant mechanism enables the energy harvester to conduct vibration reduction and absorption under the broadband vibration condition, the application scene is broadened, and the energy absorption efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of energy harvesting, and in particular relates to a variable stiffness adjustable piezoelectric energy harvester. Background technique [0002] With the rapid development of composite materials, power systems, sensing technology, and flight control, especially in military applications, the maneuverability, reliability, safety, and economy of helicopters are all subject to increasingly severe tests. However, structural vibration fatigue and acoustic fatigue caused by unsteady airflow loads, engine vibration loads, and strong noise loads during flight have serious consequences, so they have received increasing attention. [0003] Piezoelectric energy harvesting technology is the use of energy harvesting technology to convert other forms of energy in the natural environment into electrical energy, and then provide power for wireless sensors or micro-electromechanical systems, etc., and has become a research ho...

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Problems solved by technology

[0005] The current vibration and noise reduction components have problems such as heavy weight of the matrix structure, narrow applicable frequency band of fixed stiffness vibration and noise reduction components, and failure to realize the recycling of vibration mechanical energy.

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