多粘弹性胶膜夹层约束阻尼梁损耗因子分析

Modal Loss Factor Analysis for Sandwich Beams Embedded with Multiple Viscoelastic Damping Thin Layers

研究了嵌入多粘弹性胶膜夹层约束阻尼梁结构的固有频率及损耗因子分析的一种有限元方法。基于分层离散的LayerWise理论推导了阻尼梁单元的有限元计算程式。结合模态应变能法,建立了多阻尼层约束梁模态损耗因子的计算方法。将该方法与传统的复合单元计算方法及试验数据进行了比较。结果表明,该方法具有计算精度高、计算耗费小的优点,可应用于复杂多阻尼夹层复合结构的损耗因子分析和阻尼参数优化设计。

The high-order discrete layer-wise theory and a beam finite element were proposed for predicting the natural frequencies and modal loss factors of sandwich damping beams with multiple thin visco-elastic layers. The finite element formulations built by the high-order theory were present. Integrating with the modal strain energy method, the modal loss factor formulas were developed for the complicated sandwich damping beams. Numerical results and evaluations of the present method with traditional hybrid finite elements and experimental results were given. It was clear that the present method is more effective, higher precision and lower expense.