涂敷硬涂层的失谐整体叶盘减缩建模及振动分析

为了提高整体叶盘的服役寿命,提出一种对叶片涂敷硬涂层的减振方法。同时,针对失谐叶盘-硬涂层复合结构的运算规模庞大的难题,提出了一种双重减缩建模方法。利用一种改进的混合界面子结构(HISCMS)法对复合结构进行第一重的自由度减缩。利用一种模态密集判别准则与经典模态减缩(SNM)法的思想对综合后的模型进行第二重的模态减缩。选取了对叶片双面涂敷NiCoCrAlY+YSZ(yttria-stabilized zirconia,氧化锆) 硬涂层的失谐叶盘进行仿真分析及试验测试,以探究失谐叶盘的振动情况以及硬涂层厚度对失谐叶盘的影响。结果表明:双重减缩建模方法能够在保证计算精度的前提下提高25.86%~42.05%的计算效率;而且硬涂层表现出较强的阻尼作用,能够在共振区显著抑制失谐叶盘的共振响应。 

Reduced-order modeling and vibration analysis of mistuned blisk with damping hard coating

For mistuned blisk (integrally bladed disk), a method for damping hard coating on blades was proposed to reduce vibration and improve its working life. However, the high fidelity model of mistuned blisk with hard coating tended to characterize massive computational scales in a finite element analysis, thus a method of double reduced-order modeling was developed to deal with this defect. Degrees of freedom of mistuned blisk with hard coating were reduced by using an improved hybrid interface sub-structural component modal synthesis (HISCMS) method, the modes of mistuned blisk with hard coating were reduced based on a criterion of intensive modes and a method of subset of nominal modes (SNM). In order to investigate vibration of mistuned blisk and the influence of hard coating on blisk, a mistuned blisk with NiCoCrAlY+YSZ (yttria-stabilized zirconia) hard coating on both sides of blades was selected as example to conduct simulation. Results revealed that the method of double reduced-order modeling can improve 25.86%－42.05% computational efficiency under the premise of the accuracy of calculation, the hard coating had strong damping effect, and resonant response of mistuned blisk in resonant areas can be suppressed remarkably.