带缘板摩擦阻尼片高压涡轮叶片的减振研究

利用干摩擦阻尼对构件进行减振是1种简单又有效的方法,广泛应用于航空发动机叶片上,可以有效限制叶片的振动应力水平。针对带缘板阻尼片的高压涡轮叶片,基于滞后弹簧模型,以1次谐波平衡法与动柔度法结合为基本算法,提出了1种由气动力计算激振力的方法,并对其影响参数进行研究。对该叶片进行了稳态应力响应的计算,得到使叶片振动应力最小的最优正压力,并对阻尼片质量进行了优化分析。结果表明:现有的阻尼片质量在比较合理的范围内,可以起到较好的减振效果,为提高减振效果可适当增加阻尼片质量。

Vibration Reduction of High Pressure Turbine Blade with Platform Friction Damper

Dry friction damping is a very effective method to reduce the vibration response of aeroengine blades, which can effectively limit the vibration stress level of the blade. Aiming at the high pressure turbine blade with the platform damper, a method of aerodynamic calculated exciting force was proposed, and the influence parameters were analyzed by the harmonic balance method combined with dynamic flexibility method based on the hysteretic spring model. The stress response was calculated on the blade, optimum stress made the blade vibration stress, and the damper mass was optimum analyzed. The results show that the increase of damper mass can improve the results of vibration reduction in a reasonable range.