Vibration Signature Analysis and Acoustic Emission Monitoring at Brayton Point

摘要

This report discusses the on-line monitoring techniques of vibration signature analysis and acoustic emission detection in light of a two-year monitoring program at the Brayton Point plant of New England Power Service Company. Included in the study are discussions relating to sensor selection and location, spectrum analysis techniques, computation equipment, and display devices. Specificjilant equipment failures occurred during the monitoring period, and the appropriate vibration and acoustic emission data are analyzed to assess any deviations prior to failure.nVibration signature analysis is seen to be a we11-developed technique which can be successfully implemented into a preventative maintenance system for fossil plants. Before being able to detect changes in vibration spectra due to malfunction, however, it is stressed that a full understanding of the effect of normal variations in plant parameters (load, speed, etc.) should be achieved. This implies a statistical base of information and derived correlation equations.