Data Zeroing Based on Correlation and Linear Interpolation of the Blade Tip-Timing Data

The blade tip-timing has become the most promising technique in the field of rotating blade vibration monitoring with its advantages of non-contacting. However the signal can be disturbed by many factors, especially the noise and drift of the blade vibration displacement curve caused by the centrifugal force changed with rotating speed. The main difficulty to data zeroing is to prevent the peak amplitude from being attenuated or eliminated. In this paper, a method was developed using blade vibration displacement to identify the areas of resonance by calculating the correlation of the data over a number of assembly revolutions from the multi-probe. The blade vibration simulator is carried out to study the relationship between the number of probes and the window width in the correlation. Applying this method into the experimental data, and verify the superiority of the correlation method.