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Nonlinear modeling method of broadband piezoelectric energy capture system

A piezoelectric energy and modeling method technology, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, generators/motors, etc., can solve the nonlinear restoring force model to obtain complex and accurate modeling. Difficulty, etc.

Inactive Publication Date: 2014-05-21
XI AN JIAOTONG UNIV
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Problems solved by technology

The precise modeling of the latter is very difficult, one of the reasons is that the acquisition of the nonlinear restoring force model of the system is relatively complicated

Method used

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  • Nonlinear modeling method of broadband piezoelectric energy capture system
  • Nonlinear modeling method of broadband piezoelectric energy capture system
  • Nonlinear modeling method of broadband piezoelectric energy capture system

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Embodiment Construction

[0061] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0062] Introduction to the test bench: figure 1 It is a schematic diagram of a magnetically coupled nonlinear broadband piezoelectric energy harvesting system. Taking this as an example, the nonlinear model of the broadband piezoelectric energy harvesting system is derived and verified by experiments. In the experimental device, the excitation source generation system is composed of an exciter, a signal generator and a power amplifier to excite the piezo-electromagnetic coupling energy harvesting system. Use the oscilloscope to obtain and display the experimental data such as the voltage generated by the system in real time. The nonlinear restoring force of the system is measured with a miniature force gauge. figure 2 The schematic diagram of the structure of the system is shown. The whole structure is composed of piezoelectric materials, intermedi...

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Abstract

The invention provides a nonlinear modeling method of a broadband piezoelectric energy capture system. The method comprises the following steps of: directly measuring nonlinear restoring force in the broadband piezoelectric energy capture system by using a force measuring instrument; fitting the data of the nonlinear restoring force in the system by adopting a polynomial equation, and then obtaining an expression of the nonlinear restoring force and parameter values in the expression; according to the Hamilton's principle, the theory of piezoelectricity, the Rayleigh-Ritz principle, the Euler-Bernoulli beam theory, the electric-field constant distribution theory and the Rayleigh theorem for damping, performing deduction to obtain an expression of a nonlinear dynamic model of the broadband piezoelectric energy capture system and parameter values in the model. According to the invention, a model with nonlinear output characteristics can be accurately predicted, and can be obtained simply.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric vibration energy power generation, and in particular relates to a nonlinear modeling method of a broadband piezoelectric energy capture system. Background technique [0002] In the past ten years, electronic technology, micro-electromechanical technology, and sensor technology have developed rapidly, and more and more low-power wireless sensors have been applied to various structures, equipment or environments. Currently, most of these sensors are powered by traditional non-rechargeable batteries. However, it is very difficult to replace the battery for this type of sensor, especially for sensors embedded in mountains, tracks, bridges, large machinery, buildings, etc., the battery replacement task of power supply is very expensive. In addition, the batteries used in current sensors not only have limited energy and life, but also have problems such as environmental pollution after use. If e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/18
Inventor 曹军义周生喜林京刘胜胜曹秉刚
Owner XI AN JIAOTONG UNIV
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