Modeling and parameter identification method for nonlinear broadband piezoelectric energy harvesting system

An energy capture and system modeling technology, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, electrical digital data processing, electrical components, etc.

Active Publication Date: 2016-10-26
XI AN JIAOTONG UNIV
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Problems solved by technology

Accurate modeling of the latter is very difficult, in part due to the difficulty of measuring the magnetic forces of the system

Method used

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  • Modeling and parameter identification method for nonlinear broadband piezoelectric energy harvesting system
  • Modeling and parameter identification method for nonlinear broadband piezoelectric energy harvesting system
  • Modeling and parameter identification method for nonlinear broadband piezoelectric energy harvesting system

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Embodiment Construction

[0093] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0094] refer to figure 1 , the broadband piezoelectric vibration energy capture system of the embodiment includes a cantilever beam, a piezoelectric sheet is connected to the upper end of the cantilever beam, the piezoelectric sheet is connected to a load resistor R, an end magnet is arranged at the lower end of the cantilever beam, and two External magnets, external magnets and end magnets cooperate.

[0095] A method for modeling and parameter identification of a nonlinear broadband piezoelectric energy harvesting system, comprising the following steps:

[0096] 1) According to the Hamiltonian principle, piezoelectric theory, Rayleigh-Ritz principle, Euler-Bernoulli beam theory, electric field constant value distribution theory and Rayleigh damping theorem, the dynamic model expression of the linear piezoelectric vibration energy capture system is ...

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Abstract

The invention discloses a modeling and parameter identification method for a nonlinear broadband piezoelectric energy harvesting system. The method comprises the steps of carrying out identification to obtain a linear piezoelectric vibration energy harvesting system model, calculating quality, rigidity and damping; calculating an electromechanical coupling coefficient by employing a speed-voltage subsystem separated from a linear piezoelectric energy harvesting system; fitting nonlinear restoring force in the nonlinear broadband piezoelectric vibration energy harvesting system by employing a polynomial, taking the nonlinear restoring force as system input when a nonlinear broadband piezoelectric energy harvesting system model is identified, carrying out identification to obtain a discrete time state space equation of the nonlinear broadband piezoelectric vibration energy harvesting system, carrying out calculation to obtain the nonlinear restoring force by employing a frequency response function, and finishing carrying out modeling and parameter identification on the nonlinear broadband piezoelectric vibration energy harvesting system. According to the method, the model capable of accurately predicting the output feature of the broadband piezoelectric energy harvesting system is established, and various parameters and the nonlinear restoring force of the system are calculated by employing the model.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric vibration energy capture modeling, in particular to a method for modeling and parameter identification of a nonlinear broadband piezoelectric energy capture system. Background technique [0002] Usually, the process of obtaining energy in the surrounding environment and converting it into usable energy is called energy capture, and energy capture technology has great application prospects. At present, there are many types of energy capture technologies, such as solar power generation, wind power generation, temperature difference power generation, RF power generation, human body power generation, atmospheric pressure difference power generation and vibration power generation. Compared with other energy sources, vibration energy is relatively stable and widespread. There are three methods of vibration energy capture: electromagnetic, electrostatic, and piezoelectric. Among them, the voltage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02N2/18
CPCH02N2/18G06F30/367
Inventor 曹军义李丹蔡云龙
Owner XI AN JIAOTONG UNIV
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