Micro wind turbine generator based on wind-induced vibration mechanism and piezoelectric effect

Abstract

The invention provides a method of using the wind-induced vibration phenomenon of a micro structure to generate power and a micro generator based on wind-induced vibration mechanism and piezoelectric effect, wherein the micro generator comprises a silicon underlay, a composite beam / membrane comprising a piezoelectric layer and metal electrodes on the upper surface and the lower surface thereof, and the like. When the load of environmental wind causes the vibration of the composite beam / membrane structure comprising the piezoelectric layer, the vibration of the beam / membrane structure can cause the alternative change of the stress of the piezoelectric layer; due to the piezoelectric effect, the upper metal electrode and the lower electrode of the piezoelectric layer can generate an alternatively changed electric potential difference; and the electric potential difference can supply power for the load or a power accumulator. The composite beam / membrane structure comprising the piezoelectric layer can adopt a plurality of structure forms comprising a cantilever composite bema, a double-end fixedly supported composite beam, a multi-point fixedly supported composite part or a composite membrane which is partially and fixedly supported in the boundary. The micro wind turbine generator based on wind-induced vibration mechanism does not need a rotating mechanism, has a simple structure, is convenient to adopt silicon micro-processing technology to implement batch processing, has low cost, and is suitable for supplying power for wireless sensing network nodes, and the like.

Description

technical field [0001] The invention belongs to the field of micro-electro-mechanical systems (MEMS), in particular to MEMS micro-energy (Power MEMS) technology. Background technique [0002] The development of integrated circuits and MEMS technology has made it possible to construct wireless sensor networks with thousands of nodes. Wireless sensor networks have broad application prospects in the fields of environmental monitoring, large building health monitoring, public safety, and military affairs. , has aroused widespread attention at home and abroad. Due to the disadvantages of large battery size, limited life, and need for replacement, the application in long-life wireless sensor networks, wireless sensor networks set in hazardous environments, and wireless sensor networks with many nodes is limited. In addition, portable electronic products also have a huge demand for micro energy. MEMS micro energy, which converts environmental energy (such as vibration energy, the...

AI Technical Summary

Problems solved by technology

The study found that the design of long-span bridges cannot only consider the static response under wind load, but also the dynamic response of the structure, that is, the structural vibration caused by wind load, which may make drivers or passengers feel uncomfortable. Comfortable, may also cause bridge structure fatigue, and even cause bridge wind damage accidents

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