带缘板阻尼块涡轮叶片减振特性研究

以某型带缘板阻尼块涡轮叶片为对象,采用二维整体-局部统一滑动模型,编制涡轮叶片振动响应分析程序。在此基础上系统地计算不同参数时带缘板阻尼块叶片的振动响应,分析了正压力、外激励对减振效果的影响。算例分析表明:同一外激励下,存在一最佳正压力可以使系统减振效果比较好;正压力不变时,外激励幅值大小的变化对叶片减振效果有较大影响;另外阻尼块对叶片起到调频作用。

Reduced Vibration Characteristics of Turbine Blade with Platform Damper

The vibration response analysis program of a turbine blade is developed by using the two-dimensional macro-micro slip model. The influence factors of reducing the vibration response, such as the normal force and the exciting force, are achieved by calculating example. The results show that at the same exciting force, there is a normal force which makes the response decrease effectively. The exciting force is important to reduce the vibration response of dry friction damping. In addition, introducing the friction damper can also modulate the natural frequency of the blade system.