Title :
Estimation of Fatigue Life Using Ultrasonic Sensing: A Symbolic Dynamics Approach
Author :
Gupta, Shalabh ; Ray, Asok
Author_Institution :
Pennsylvania State Univ., University Park
Abstract :
The paper addresses the issues of diagnosis and prognosis of fatigue failure in mechanical systems using symbolic time series analysis (STSA) of ultrasonic sensor data. Specifically, the paper presents a statistical analysis procedure for online estimation of remaining fatigue life in polycrystalline alloys using STSA-based information from an ensemble of fatigue experiments. This real-time information is useful for monitoring the evolving fatigue damage and life extending control of mechanical structures for prevention of widespread failures. The concept is experimentally validated on 7075-T6 aluminum alloy specimens on a special-purpose fatigue test apparatus that is equipped with ultrasonic flaw detectors and an optical travelling microscope.
Keywords :
aluminium alloys; fatigue; fatigue testing; flaw detection; remaining life assessment; structural engineering; time series; ultrasonic transducers; fatigue failure; fatigue life estimation; life extending control; mechanical structures; mechanical systems; online estimation; optical travelling microscope; polycrystalline alloys; statistical analysis; symbolic dynamics approach; symbolic time series analysis; ultrasonic flaw detectors; ultrasonic sensing; Condition monitoring; Failure analysis; Fatigue; Life estimation; Mechanical sensors; Mechanical systems; Optical microscopy; Sensor systems; Statistical analysis; Time series analysis;
Conference_Titel :
American Control Conference, 2007. ACC '07
Conference_Location :
New York, NY
Print_ISBN :
1-4244-0988-8
Electronic_ISBN :
0743-1619
DOI :
10.1109/ACC.2007.4282229
