Paper folding coupling broadband nonlinear piezoelectric vibration power generation device

Abstract

The invention provides a paper folding coupling broadband nonlinear piezoelectric vibration power generation device, which comprises a first piezoelectric beam and a second piezoelectric beam, whereinthe first piezoelectric beam and the second piezoelectric beam are arranged in parallel, one end of the first piezoelectric beam and one end of the second piezoelectric beam are fixed to a vibrationsource, the other end of the first piezoelectric beam and the other end of the second piezoelectric beam are free ends and provided with a first mass block and a second mass block respectively, a paper folding coupling nonlinear element is further connected between the free ends of the first piezoelectric beam and the second piezoelectric beam in a bridging mode, and piezoelectric patches are arranged on the upper surfaces and the lower surfaces of the first piezoelectric beam and the second piezoelectric beam. In the vibration process, the paper folding coupling nonlinear element can change the structural rigidity through dynamic folding, so that the energy collection frequency band is broadened, and the energy collection frequency is improved.

Description

technical field [0001] The invention relates to the field of piezoelectric vibration power generation, in particular to an origami coupling broadband nonlinear piezoelectric vibration power generation device. Background technique [0002] In recent years, with the continuous development of microelectronics and wireless communication technology, the advancement of large-scale wireless sensor networks, wearable devices, and Internet of Things technology has been promoted, and its applications in military, medical, environmental monitoring, industrial automation and other fields High profile. These wireless sensor networks and wearable devices all rely on traditional batteries to provide power, but traditional batteries have disadvantages such as short service life, large size, and environmental pollution, and are difficult to update and maintain in some occasions, which brings difficulties to practical applications and limits wireless technology. Large-scale applications of s...

AI Technical Summary

Problems solved by technology

However, the existing piezoelectric vibration energy conversion devices generally have the problems of fixed and single working frequency and narrow working frequency band. In practical applications, the environmental frequency often changes within a certain range, fluctuates randomly, and does not have a fixed period. Therefore, this A piezoelectric energy harvester with a single operating frequency and a narrow operating frequency band cannot meet the actual needs of use

[0004] In CN 209823663 U, a utility model patent titled "a multi-degree-of-freedom vibration power generation platform based on piezoelectric materials" is disclosed. In this application, the properties of the vibration system can be changed by adjusting the spring stiffness. The spring conforms to Hu Gram's law is a monostable structure; and in the elastic range, its stiffness is constant, and the entire energy collection process is a linear change, which cannot realize the collection of multi-band energy, and the energy collection frequency is low; and changing the spring stiffness requires its effective circle The number, diameter, wire diameter, material, etc. are changed, and the operation is complicated

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