含周期压电俘能器的点阵夹芯结构的波动和振动特性研究

Lattice sandwich structures not only have excellent load-carrying capability, but also have superior advantages over traditional sandwich structures in its potential for multi-functional design, such as anti-shocking, stealth, vibration suppression, noise reduction and smart actuation, thus they have extensive potential applications in the fields of aerospace, automotives and ships. In the practical applications of lattice sandwich structures, vibration suppression is a key issue to be solved urgently. Investigation of the characteristics of elastic wave propagation in lattice sandwich structures and exploitation of the bandgap effect in elastic wave propagation provide a new possible route to address this issue. In order to explore the feasibility of vibration suppression design based on the bandgap effect and energy harvesting principle, the present proposal aims to investigate the elastic wave propagation characteristic, energy harvesting and vibration suppression properties of lattice sandwich structures with periodic piezoelectric energy harvesters (including piezoelectric resonators and energy harvesting circuits) via theoretical, numerical and experimental methods. On that basis, we will analyze the effects of material properties, geometric parameters and the parameters of the energy harvesting circuits on the bandgap characteristic and the energy harvesting performance of a unit cell, explore the intrinsic correlation of the vibration suppression performance of the whole structure with the bandgap characteristic and energy harvesting performance, and clarify the mechanisms of vibration suppression and energy harvesting. The implement of the present proposal will provide theoretical guide for multi-functional design of lattice sandwich structures with superior load-carrying capability, vibration suppression property and energy harvesting performance.

点阵夹芯结构不仅具有优异的承载能力，而且在抗冲击、隐身、减振、降噪和智能驱动等多功能化方面也具有传统夹芯结构无法比拟的优势，因此其在航空、航天、汽车、船舶等领域具有广阔的应用前景。振动抑制是点阵夹芯结构实际应用中一个亟需解决的关键问题，研究点阵夹芯结构的弹性波传播特性并利用波传播的禁带效应来抑制振动为解决这一问题提供了可能。为探索利用禁带效应和能量收集原理进行减振设计的可行性，本项目拟采用理论分析、数值仿真和实验验证相结合的方法，研究含周期压电俘能器（包括压电谐振器和俘能电路）的点阵夹芯结构的弹性波传播特性、俘能性能和减振性能，分析材料和几何参数以及俘能电路参数对弹性波传播的禁带特征和单胞的俘能性能的影响规律，探讨整体结构的减振性能与其弹性波传播的禁带特征及其俘能性能的内在关联，揭示结构的减振和俘能机理。本项目的研究可为点阵夹芯结构的承载、减振和俘能的多功能一体化设计提供理论基础。

点阵夹芯结构不仅具有优异的承载能力，而且在抗冲击、隐身、减振、降噪和智能驱动等多功能化方面也具有传统夹芯结构无法比拟的优势。因此其在航空、航天、汽车、船舶等领域具有广阔的应用前景。振动抑制是点阵夹芯结构实际应用中一个亟需解决的关键问题，研究点阵夹芯结构的弹性波传播特性并利用波传播的禁带效应来抑制振动为解决这一问题提供了可能。本项目采用理论分析和数值仿真相结合的方法，研究了波纹板夹芯结构（波纹板结构是一种典型的二维点阵结构）和含有谐振器的粘弹性声子晶体杆结构的弹性波传播特性，分析了材料和几何参数对弹性波传播的禁带特征的影响规律，探讨了整体结构的减振性能与其弹性波传播的禁带特征的内在关联，揭示了结构的减振机理。