Active sensors for health monitoring of aging aerospace structures
A project to develop non-intrusive active sensors that can be applied on existing aging aerospace structures for monitoring the onset and progress of structural damage (fatigue cracks and corrosion) is presented. The state of the art in active sensors structural health monitoring and damage detection is reviewed. Methods based on (a) elastic wave propagation and (b) electro-mechanical (NM) impedance technique are sighted and briefly discussed. The instrumentation of these specimens with piezoelectric active sensors is illustrated. The main detection strategies (E/M impedance for local area detection and wave propagation for wide area interrogation) are discussed. The signal processing and damage interpretation algorithms are tuned to the specific structural interrogation method used. In the high-frequency EIM impedance approach, pattern recognition methods are used to compare impedance signatures taken at various time intervals and to identify damage presence and progression from the change in these signatures. In the wave propagation approach, the acoustic-ultrasonic methods identifying additional reflection generated from the damage site and changes in transmission velocity and phase are used. Both approaches benefit from the use of artificial intelligence neural networks algorithms that can extract damage features based on a learning process. Design and fabrication of a set of structural specimens representative of aging aerospace structures is presented. Three built-up specimens, (pristine, with cracks, and with corrosion damage) are used. The specimen instrumentation with active sensors fabricated at the University of South Carolina is illustrated. Preliminary results obtained with the E/M impedance method on pristine and cracked specimens are presented.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 752614
- Report Number(s):
- SAND2000-0601C; TRN: AH200018%%354
- Resource Relation:
- Conference: SPIE's 7th International Symposium on Smart Structures and Materials and 5th International Symposium on Nondestructive Evaluation and Health Monitoring of Aging Infrastructure, Newport Beach, CA (US), 03/05/2000--03/09/2000; Other Information: PBD: 8 Mar 2000
- Country of Publication:
- United States
- Language:
- English
Similar Records
Real-Time Canister Welding Health Monitoring and Prediction System for Spent Fuel Dry Storage
On-Line Monitoring and Diagnostics of the Integrity of Nuclear Plant Steam Generators and Heat Exchangers, Volumes 1, 2
Related Subjects
AIRCRAFT
MONITORS
AGING
NONDESTRUCTIVE TESTING
FATIGUE
CRACK PROPAGATION
CORROSION
TECHNOLOGY ASSESSMENT
PIEZOELECTRICITY
DATA ANALYSIS
PIEZOELECTRIC SENSORS
ACTIVE SENSORS
AGING AIRCRAFT
DAMAGE DETECTION
HEALTH MONITORING
FAILURE PREVENTION
ULTRASONICS
PULSE-ECHO DETECTION
EMITTER-RECEPTOR DETECTION
ACOUSTO-ULTRASONIC
SIGNAL ANALYSIS
WAVELET TRANSFORM