Estimation of Fatigue Life Using Ultrasonic Sensing: A Symbolic Dynamics Approach

Author

Gupta, Shalabh ; Ray, Asok

Author_Institution

Pennsylvania State Univ., University Park

fYear

2007

fDate

9-13 July 2007

Firstpage

1149

Lastpage

1154

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;

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.2007.4282229

Filename

4282229