DocumentCode :
3171829
Title :
Irreversibility-based Measure of Slowly Evolving Anomalies
Author :
Srivastav, Abhishek ; Ray, Asok ; Gupta, Shalabh
Author_Institution :
Pennsylvania State Univ., University Park
fYear :
2007
fDate :
9-13 July 2007
Firstpage :
3228
Lastpage :
3233
Abstract :
This paper presents formulation and experimental validation of a novel real-time analytical tool for detection of slowly evolving anomalies (e.g., incipient faults and their growth) in dynamical systems. The measure of anomaly is built upon the concept of thermodynamic irreversibility (i.e., deviation of the system trajectory from the respective reversible path of equilibrium state transitions) and is derived as the distance of the estimated system states from the respective (ideal) equilibrium states on the evolution trajectory. The proposed anomaly detection method has been applied to track fatigue damage growth in test specimens of polycrystalline (e.g., 7075-T6 Aluminium) alloys subjected to cyclic loading. The results of experimentation on a laboratory test apparatus are presented to validate the theoretical concept in both crack initiation and crack propagation phases.
Keywords :
cracks; evolutionary computation; large-scale systems; statistical analysis; thermodynamics; time-varying systems; anomaly detection method; crack initiation; crack propagation; cyclic loading; dynamical systems; equilibrium state transitions; evolution trajectory; fatigue damage growth tracking; irreversibility-based measure; real-time analytical tool; system state estimation; system trajectory; thermodynamic irreversibility; Cities and towns; Control systems; Degradation; Fatigue; Fault detection; Laboratories; Real time systems; State estimation; Testing; Thermodynamics; Fatigue Damage; Fault Detection; Thermodynamic Formalism;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
American Control Conference, 2007. ACC '07
Conference_Location :
New York, NY
ISSN :
0743-1619
Print_ISBN :
1-4244-0988-8
Electronic_ISBN :
0743-1619
Type :
conf
DOI :
10.1109/ACC.2007.4282880
Filename :
4282880
Link To Document :
بازگشت