The invention discloses a vibration pick-up structure on the basis of a flexible main beam for a vibration
energy harvester. The vibration pick-up structure comprises the flexible main beam, a plurality of
piezoelectric cantilever beams and
mass blocks. The flexible main beam is of a rectangular frame structure, and a rectangular hole is formed in the middle of the flexible main beam; one end of each
cantilever beam is fixedly adhered on the upper surface of the flexible main beam, the other end of each
piezoelectric cantilever bream is suspended above the rectangular hole, and each
mass block is adhered at the suspended end of the corresponding
piezoelectric cantilever beam; the multiple piezoelectric
cantilever beams are respectively arranged on two sides of the rectangular holes to form forking fingers and are parallel and
equidistant to short sides of the rectangular hole. By the aid of the forking finger type multi-
cantilever-
beam vibration pick-up structure on the basis of the flexible main beam in the design, high-order vibration pick-up frequencies and of a
system can be greatly reduced, low-order vibration pick-up frequencies of the
system can be reduced, and accordingly a
vibration energy harvesting frequency band of the
system can be effectively broadened. Compared with the traditional vibration pick-up structure of a vibration
energy harvester, the vibration pick-up structure has the advantages that
broadband vibration energy can be harvested in ultra-
low frequency ranges of frequencies lower than 100Hz, output
voltage can be increased, and accordingly the
energy harvesting efficiency can be improved.