Sideband frequency response function based damage identification of rotor system with open cracks

Jie Zhao; Hans DeSmidt

doi:10.1117/12.2045253

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9 March 2014 Sideband frequency response function based damage identification of rotor system with open cracks

Jie Zhao, Hans DeSmidt

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Proceedings Volume 9064, Health Monitoring of Structural and Biological Systems 2014; 90640Q (2014) https://doi.org/10.1117/12.2045253
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

This paper develops a new vibration based damage detection method to identify the location and severity of structural damage of periodically time-varying systems. The frequency response function (FRF) shifts induced by cracks are utilized to detect the location, depth and orientation angle of open transverse cracks on a shaft-disk system. The dynamical model of system is built based on the Lagrange principle and the assumed mode method while the crack model for periodically time-varying systems is based on the fracture mechanics. This method provides the advantages of arbitrary interrogation frequency and multiple inputs/outputs which greatly enriches the dataset for damage identification. The method is synthesized via harmonic balance and numerical examples for a shaft/disk system to demonstrate the effectiveness in detecting both location and severity of the structural damage.

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Jie Zhao and Hans DeSmidt "Sideband frequency response function based damage identification of rotor system with open cracks", Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 90640Q (9 March 2014); https://doi.org/10.1117/12.2045253

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