A topology optimization method for vibration energy harvesting piezoelectric metamaterial thin plate structure

A vibration energy collection, material thin plate technology, applied in design optimization/simulation, electrical digital data processing, instruments, etc., can solve the problem of not considering the optimization of unit cell size, poor ability to collect broadband vibration energy, and high quality factor. To achieve the effect of easy implementation, efficient capture, and simple calculation process

Active Publication Date: 2021-05-11
HUNAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this cantilever beam structure has several obvious shortcomings in practical applications: one is that it requires additional space to place the mass block and the clamping end; It produces the maximum energy and has poor ability to collect broadband vibration energy; the third is that its resonance frequency is inversely proportional to the length, and it needs to increase the length to collect low-frequency vibration energy
Chinese patent CN202010063955.7 discloses a vibration energy harvesting piezoelectric metamaterial thin plate material topology optimization method, which optimizes the layout of piezoelectric materials under the condition of given thin plate and mass block, so that the first-order vibration bandgap width is the largest , but does not consider the optimization of the size of each part of the unit cell, so it is urgent to optimize the size of the unit cell structure to obtain the largest first-order vibration bandgap width

Method used

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  • A topology optimization method for vibration energy harvesting piezoelectric metamaterial thin plate structure
  • A topology optimization method for vibration energy harvesting piezoelectric metamaterial thin plate structure
  • A topology optimization method for vibration energy harvesting piezoelectric metamaterial thin plate structure

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Embodiment 1

[0067] Such as figure 2 The shown vibration energy harvesting piezoelectric metamaterial thin plate structure is mainly used in the collection of vibration energy, including a plurality of periodically arranged unit cells, and the unit cells include an elastic substrate 1, a piezoelectric material 2 and a mass Block 3. Such as image 3 As shown, the piezoelectric material 2 is connected to the elastic substrate 1 by overlapping the surroundings, the mass block 3 is pasted and placed above the middle of the piezoelectric material 2, and the piezoelectric material 2 and the elastic There is no overlapping portion of the substrate 1 , that is, there is no elastic substrate 1 where the piezoelectric material 2 is located.

[0068] Preferably, the elastic substrate 1 can be made of materials such as aluminum plate, copper plate or silver plate, preferably an aluminum block in this embodiment; the piezoelectric material 2 can be made of ferroelectric ceramics, piezoelectric ceram...

Embodiment 2

[0075] Such as figure 1 A vibration energy harvesting piezoelectric metamaterial thin plate structure topology optimization method is shown, using the unit cell unit composed of elastic substrate 1, piezoelectric material 2 and mass block 3 as described in Embodiment 1. According to Bloch's theorem, the piezoelectric The vibration bandgap of the metamaterial thin plate can be calculated by solving the eigenvalues ​​of the unit cell, so only the topology optimization of the unit cell structure size needs to be considered. This embodiment is a method based on differential evolution combined with Matlab and Comsol hybrid programming. Algorithmic Topology Optimization Method for Vibrational Energy Harvesting Piezoelectric Metamaterial Sheet Structures.

[0076] In the topology optimization of vibration energy harvesting piezoelectric metamaterial thin plate structure, it is assumed that the shape of each component of the unit cell can be characterized by parameters (such as the ra...

Embodiment 3

[0112] The present invention also provides a computer device on the basis of the second embodiment, the computer device may be a server, and its internal structure diagram may be as follows Figure 5 shown. The computer device includes a processor, memory, network interface and database connected by a system bus. Wherein, the processor of the computer device is used to provide calculation and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs and databases. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database of the computer device is used to store basic model component data. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is exec...

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Abstract

This application relates to a topology optimization method for vibration energy harvesting piezoelectric metamaterial thin plate structure, including: obtaining the D-dimensional structure size and algorithm parameter value of the unit cell unit and performing initialization processing; establishing a parameterized finite element model and performing simulation calculation; calculation The first vibration bandgap of the piezoelectric metamaterial thin plate, when the number of iterations exceeds a predetermined value or the decrease of the first vibration bandgap is less than a set threshold, the optimization process is terminated; otherwise, multiple groups of geometric size individuals are selected for variation The operation generates a variation vector group; multiple groups of geometric size individuals are selected and sorted; multiple groups of geometric size individuals are selected for crossover operation; better geometric size individuals are selected as the new D-dimensional structure size, and all optimizations are gradually achieved. The physical meaning of the method of the invention is clear, the established objective function is directly related to the geometric size of the unit cell, the geometric size of each component of the unit cell structure can be optimized simultaneously, and the calculation process is simple and easy to implement.

Description

technical field [0001] The present application relates to the technical field of piezoelectric material vibration power generation, in particular to a topology optimization method for vibration energy harvesting piezoelectric metamaterial thin plate structure. Background technique [0002] It is an important development trend of structural health monitoring (SHM) technology to design a sensor monitoring system that meets various requirements and integrate it into the structure so that the structure itself can realize self-sensing and self-diagnosis. In particular, the SHM wireless sensor network based on micro-electromechanical systems (MEMS) has the advantages of both MEMS and wireless measurement and control technologies, and is currently the key research direction of SHM technology for major projects. How to provide long-term and reliable power for wireless sensor nodes is one of the problems to be solved in the field of SHM. [0003] As the power consumption of wireless...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F113/24
Inventor 陈仲生何静刘建华张昌凡胡雷朱敏盛浩夏叶媚
Owner HUNAN UNIV OF TECH
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