【摘要】 利用一种基于应变依赖性硬涂层的整体叶盘阻尼减振方案,研究了叶片涂敷应变依赖性硬涂层的整体叶盘非线性动力学特性。首先,基于离散试验数据与高阶多项式得到了非线性硬涂层的连续力学参数;然后,利用基于改进复模量理论与复合Mindlin板理论的能量有限元法,创建了考虑应变依赖性的硬涂层整体叶盘的非线性动力学模型;其次,基于Newton-Raphson计算方法提出一套非线性迭代计算流程,求解了硬涂层整体叶盘的非线性共振频率与共振响应;最后,选择叶片涂敷NiCoCrAlY+YSZ硬涂层的整体叶盘为研究实例进行数值分析与试验测试,分析了硬涂层及其应变依赖性对整体叶盘振动特性的影响。研究结果表明,整体叶盘在涂敷硬涂层后的振动响应得到有效抑制,而应变依赖性能有效增强硬涂层对整体叶盘的减振效果。更多还原

【Abstract】 Here, nonlinear dynamic characteristics of integral blade disc coated with strain-dependent hard coating were studied by using a vibration reduction scheme of integral blade disc damping based on strain-dependent hard coating. Firstly, continuous mechanical parameters of nonlinear hard coating were obtained based on discrete test data and high-order polynomials. Then, using the energy finite element method based on the improved complex modulus theory and the composite Mindlin plate theory, the nonlinear dynamic model of an integral blade disc coated with hard coating considering strain-dependence was established. Secondly, based on Newton-Raphson calculation method, a set of nonlinear iterative calculation procedures was proposed to solve nonlinear resonance frequencies and resonance responses of the integral blade disc. Finally, an integral blade disc coated with NiCoCrAlY+YSZ hard coating was taken as a study example for numerical analysis and tests to analyze effects of hard coating and its strain-dependence on vibration characteristics of the integral blade disc. The study results showed that vibration responses of the integral blade disc coated with hard coating can be effectively suppressed, and the strain-dependent performance can effectively enhance the vibration reduction effect of hard coating on the integral blade disc.更多还原