Evaluation of Operational Stability of Main Shaft

Abstract

AbstractThe main shaft and bearings are the key components to support and maintain the steady rotation of the RPT. The shaft displacement signals can directly reflect the detailed displacements of the main shaft within the bearing clearances and can also be employed for the synthesis of shaft orbit using the measured signals in two orthogonal directions. However, due to the interferences of many factors (e.g. the background noises and the eddy current effects of experimental sensors), the original shaft displacement signal cannot accurately reflect the actual operational states of main shaft. In this chapter, a set of signal analysis procedure based on the wavelet threshold de-noising method, VMD and cross-correlation analysis method is innovatively proposed to extract the effective components in the shaft displacement signal and recognize the shaft orbits. In addition, the shape evolution of shaft orbit is clearly described using the PE values in combination with the pressure fluctuation signals in the draft tube.