During run ups and run downs, the rotating blades are subjected to fluctuating forces with time dependent frequencies and the dynamic response of the blades around the resonance crossings deviates from the stationary response. This paper presents a procedure to identify the vibration parameters of rotating blades under this non-stationary condition. An analytically based solution of a single degree of freedom (SDOF) system exposed to a transient harmonic excitation with linear time varying frequency is used for parameters identification. This analytical model is fitted into the Blade Tip-Timing (BTT) data and the vibration parameters are determined by a least square optimization technique. A numerical simulator based on a lumped parameter model of the bladed disk assembly is employed to demonstrate the method performance. Afterwards, the accuracy of the method is proved by testing it on the experimental data acquired by BTT and strain gauges on a rotating bladed disk.

在上升和下降过程中，旋转叶片受到具有时间相关频率的波动力，并且共振交叉点周围叶片的动态响应偏离了静态响应。本文提出了一种在这种非平稳条件下确定旋转叶片振动参数的程序。暴露于具有线性时变频率的瞬态谐波激励的单自由度 (SDOF) 系统的基于分析的解决方案用于参数识别。该分析模型适用于叶片尖端正时 (BTT) 数据，振动参数由最小二乘优化技术确定。采用基于叶盘组件集总参数模型的数值模拟器来演示该方法的性能。然后，