FORCED RESPONSE OF SDOF ROTATING BLADE BY BLADE-TIP-TIMING

Abstract

Blade tip timing (BTT) is a non-contact technique used for detection, measurement and analysis of blade vibrations and stresses in rotating bladed assemblies. The focus in of BTT system has been the determination of blade vibration amplitudes, phase and frequencies. Although the fundamentals of the technique are fully developed, the analysis of data obtained in the presence of simultaneous excitation response is problematic. A few methods have been introduced for the analysis of BTT data from assemblies undergoing synchronous excitation or asynchronous vibration, each of them has its inherent limitation in practice. Several of the techniques were found to perform effectively on asynchronous resonances or synchronous resonances, with accurate vibration frequency estimates yielded.noise corrupt the signal data. And hence leading to distorted results. This study is an attempt to model how noise effect the data and the effect of noise on data distortion be reduced significantly.