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Using Modal Parameters for On-Line Structural Faults Diagnostics
Richardson,Mark H. 대한기계학회 1993 Korea - U. S. Vibration Engineering Seminar Vol.1 No.1
Many types of structural faults, such as cracking, delamination, unbonding, loosening or wear out of fastened parts, etc., will cause changes in the measured vibration response of a machine or structure. These changes will, in turn, cause changes in the structure's experimentally derived modal parameters. Using this premise, a structural monitoring system which measures the vibration of a structure, identifies changes in its modal parameters, and predicts occurrences of structural faults could be built. Such a system would provide a level of accuracy far beyond the traditional peak picking of threshold crossing implementations of the past. Also, its implementation can benefit from a complete a priori knowledge of the structure's dynamic characteristics, which is contained in its modal properties. 1n this paper, several important issues associated with the use of experimentally derived modal parameters as a means of detecting structural faults are examined. Also included are some experimental results which demonstrate how modal parameters are changed by simulated faults.