基于修正模态应变能法的硬涂层薄板阻尼性能预估

Modified Modal Strain Energy Method Used for Predicting Damping Characteristics of Hard-Coating Thin Plate

在考虑硬涂层材料的小阻尼特点以及经典模态应变能法计算误差的前提下,提出了一种适用于硬涂层复合结构阻尼性能预估的新方法.推导了修正模态应变能法的原理性公式.以一个涂敷Mg-Al硬涂层的悬臂薄板为例进行了实例研究,并讨论了硬涂层材料参数、涂层厚度对结构系统阻尼性能的影响.结果发现增大硬涂层的杨氏模量、损耗因子及厚度均可提高复合结构的阻尼性能.相关研究成果可为硬涂层材料制备及阻尼减振设计提供参考.

Considering the small damping characteristics of hard-coating materials and the calculation error caused by classic modal strain energy method, a new method was proposed to predict damping characteristics of hard-coating composite structure. The principle formulas of modified modal strain energy method were deduced. A case of cantilever plate covered with Mg- A1 hard coating was carried out, and the effects of the hard coating materials parameters and coating thickness on the damping characteristics of composite structure were discussed. The analysis results showed that the increase of Young＇ s modulus, loss factor or thickness of coating can improve the damping properties of the composite structure. The relevant research results provide a reference for the preparation of hard coating materials and design of damping vibration reduction.