A Preloaded Energy Harvester with Adjustable Frequency, High Amplitude and Large Bandwidth

Abstract

The invention discloses a pre-pressed energy harvester with adjustable frequency, high amplitude and large bandwidth, comprising a main beam and at least one side beam group distributed along the axisof the main beam; the side beam group comprises side beams arranged at the two sides of the main beam, one end of each side beam is connected with the main beam, and mass blocks are respectively arranged on the upper surface and the lower surface of the free end of each side beam; piezoelectric patches are respectively arranged on the upper surface and the lower surface of each of the two ends ofthe main beam; and the two ends of the main beam are provided with a clamping end respectively, one clamping end is clamped, and the other clamping end can move along the axis of the main beam. The pre-pressed energy harvester provided by the invention has the advantages of adjustable frequency, high amplitude and large bandwidth. Regulation on resonant frequency, voltage amplitude, displacementamplitude and bandwidth of the pre-pressed energy harvester can be realized by changing structures and material parameters of the side beams, the main beam and the mass blocks and an axial force applied to a non-clamped clamping end. The pre-pressed energy harvester provided by the invention has the advantages of simple structure, easiness in preparation, low cost and easy operation, so that engineering applicability of the pre-pressed energy harvester is strong.

Description

technical field [0001] The invention relates to a preloaded energy harvester with adjustable frequency, high amplitude and large bandwidth, and belongs to the technical fields of vibration detection, piezoelectric power generation and energy recovery. Background technique [0002] With the rapid development of microelectronics technology and wireless communication technology, low-power devices such as wireless sensors, implanted devices and health monitoring devices have been widely used in many fields such as industry, transportation, military, and medical treatment. The energy required for most electronic devices is provided by conventional chemical batteries. However, due to the inevitable shortcomings of traditional batteries such as large size, short life, difficult replacement and environmental pollution, it is difficult to meet the industrial needs of micro devices and low power consumption devices. At present, piezoelectric energy harvesters have attracted more and ...

AI Technical Summary

Problems solved by technology

A piezoelectric-electromagnetic composite low-frequency bandwidth energy harvester, although the energy harvester can increase the bandwidth of the energy harvester through piezoelectric energy harvesting and electromagnetic energy harvesting, but the resonant frequency of the energy harvester cannot be adjusted in real time; in addition, Hybrid energy harvesters also have disadvantages such as complicated preparation process and large volume.

[0004] Therefore, through the above analysis, it can be seen that in terms of adjustable frequency and wide frequency, existing piezoelectric energy harvesters still have problems such as complicated preparation process, large volume and limited frequency modulation range.

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