【摘要】 针对粘弹性材料的频变性,采用模态应变能法求解三明治夹层结构的各阶固有频率及损耗因子,讨论粘弹性材料的厚度、刚度变化对结构的频率和损耗因子的影响,并采用零阶近似法进行模态损耗因子的初步优化设计;最后,对夹层板结构的横向应变动力响应进行探讨。计算结果表明,所提出的建模及计算方法有效,对于三明治夹层板的动力特性研究,考虑芯层的横向应变影响是必要的。更多还原

【Abstract】 This paper analyzes the frequency-dependent properties of viscoelastic materials by using a modal strain energy approach based on ANSYS.The improved modal strain energy(MSE)method and the Sub-problem Approximation Method are also presented to determine the resonant frequency and loss fac tors of sandwich structures under varying thickness and stiffness of the core material.An analysis regarding the optimization design is conducted accordingly.Finally,the lateral dynamic response of sandwich struc tures is discussed.For validation,a particular sandwich plate is examined,and both the theoretical solu tion and numerical solution are obtained.The results show that the proposed model is effective and that the consideration of the transverse strain in the core layer is essential for the dynamic characteristics analysis.更多还原