A Method of Modeling and Parameter Identification 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., which can solve the problems of accurate modeling and magnetic field force measurement.

Active Publication Date: 2019-04-09
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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  • A Method of Modeling and Parameter Identification for Nonlinear Broadband Piezoelectric Energy Harvesting System
  • A Method of Modeling and Parameter Identification for Nonlinear Broadband Piezoelectric Energy Harvesting System
  • A Method of Modeling and Parameter Identification 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

A method for modeling and parameter identification of a nonlinear broadband piezoelectric energy capture system. Firstly, the linear piezoelectric vibration energy capture system model is identified, and the mass, stiffness and damping are calculated; The electromechanical coupling coefficient is calculated from the velocity-voltage subsystem; finally, the nonlinear restoring force in the nonlinear broadband piezoelectric vibration energy capture system is fitted by a polynomial, and it is used as After the system input, the discrete-time state-space equation of the nonlinear broadband piezoelectric vibration energy capture system was identified, the nonlinear restoring force was calculated using its frequency response function, and the modeling and analysis of the nonlinear broadband piezoelectric vibration energy capture system was completed. For parameter identification, the invention establishes a model capable of accurately predicting the output characteristics of the broadband piezoelectric energy capture system, and uses the model to calculate various parameters of the system and nonlinear restoring force.

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 Patents(China)
IPC IPC(8): G06F17/50H02N2/18
CPCG06F30/367H02N2/18
Inventor 曹军义李丹蔡云龙
Owner XI AN JIAOTONG UNIV
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