复材蒙皮的硬涂层阻尼减振设计与优化方法

Damping anti-vibration design and optimization method of composite skin with hard coating

针对民用飞机复材蒙皮的局部振动问题,提出复材蒙皮的硬涂层阻尼减振设计方法,并综合考虑涂覆硬涂层对蒙皮结构的附加质量和固有特性影响,对硬涂层减振性能进行多参数优化。基于有限元法和经典层合板理论,建立复材蒙皮-硬涂层复合结构动力学方程,并以共振峰值降低量最高为目标、给定质量增加和固有频率变化范围为约束条件,采用可行方向法求解获得硬涂层材料性能参数和涂层厚度参数的最佳组合结果。优化算例表明,通过合理设计硬涂层的材料弹性模量和损耗因子参数组合,可涂覆更薄的涂层获得更高的共振峰值衰减,并将涂覆硬涂层带来的蒙皮结构质量增加与固有频率变化控制在设计范围内,获得最优的减振性能。

To solve the local vibration problem of thin composite skin in civil aircraft,damping anti-vibration design method with hard coating is proposed,and multi-parameter optimization method was carried out in consideration of the effects of structural parameters of coating on the mass and natural characteristics.Based on the finite element method and classical laminated plate theory,dynamic equation of compound structure of composite skin with hard coating was established.Feasible direction method was put forward to obtain the optimal combination of hard coating material performance parameters and thickness parameters to achieve the maximum reduction of resonance peak value,with constraint conditions of given mass increase and natural frequency change range.The optimization example shows that by reasonably designing the parameter combination of elastic modulus and loss factor of hard coating,a higher resonance peak value attenuation can be obtained with a thinner coating,and the optimal anti-vibration performance can be obtained when mass increase and natural frequency change of skin caused by hard coating are controlled in the design range.