粘弹性-弹性材料复合结构具有高强度/刚度、低成本/密度等特性，在航空航天航海和国防军工等重大需求领域都有重要应用。这类结构在温湿环境和多变激励下的动态响应、安全性和可靠性等方面的研究却相对较薄弱。本项目拟研究温湿幅频特性下粘弹性-弹性材料复合板壳结构的动态力学特性和弹性波能量耗散问题。主要研究内容包括：（1）基于粘弹性材料属性和能量叠加原理，构建温湿幅频特性下粘弹性材料的本构方程，推导复合板壳结构的动力学方程；（2）基于渐近原理，发展温湿幅频效应下动力学方程的高精度、高效解法；（3）分析复合结构动态力学特性的温湿幅频特性，揭示其弹性波能量耗散机理；（4）对粘弹性-弹性材料复合板壳结构进行优化设计，使之在温湿环境和多变激励工况下保持优异的力学特性。该研究成果将为粘弹性-弹性复合结构的理论建模、计算方法和动态特性分析提供理论基础和技术支撑，可促进粘弹性-弹性材料复合结构在重大工程装备中的应用。

Viscoelastic-elastic composite plates and shells are applied extensively in aviation, navigation, national defense and military industry, due to its high stiffness/strength, low density/cost. The study on the safety, reliability and mechanical response of the composite structures under hygrothermal environment and variable external excitation is weakness. This project plans to investigate the dynamic characteristic of viscoelastic-elastic composite structures and its energy dissipation properties. The main research is to: i) construct the constitutive equations of viscoelastic materials under hygrothermal environment with changeable external excitation base on the characteristic equation and superposition principle of energy; ii) develop a high precision and efficient method for the composite structure by concerning the hygrothermal and amplitude-frequency effects base on asymptotic theory; iii) investigate the dynamic properties of the composite structure under hygrothermal and amplitude-frequency effects, and reveal the energy dissipation mechanism of the propagation wave; iv) optimize the viscoelastic-elastic composite plates and shells to maintain excellent mechanical properties with consideration of the hygrothermal and amplitude-frequency effects. The study will provide a theoretical basis and technical support for modeling, calculating and examining the dynamic characteristic of viscoelastic-elastic composite structures, and will promote the application of the viscoelastic-elastic composite structures in the major engineering equipments.