The NTIS website and supporting ordering systems are undergoing a major upgrade from 8PM on September 25th through approximately October 6. During that time, much of the functionality, including subscription and product ordering, shipping, etc., will not be available. You may call NTIS at 1-800-553-6847 or (703) 605-6000 to place an order but you should expect delayed shipment. Please do NOT include credit card numbers in any email you might send NTIS.
Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website; (3) the federal government Internet portal; or (4) a web search conducted using a commercial search engine such as
Accession Number ADA564639
Title On-Orbit Assessment of Satellite Structural Properties via Robust Structural Health Monitoring.
Publication Date Jul 2012
Media Count 64p
Personal Author A. Chattopadhyay A. Vizzini Y. Liu
Abstract This project addressed the development of an integrated Structural Health Monitoring (SHM) system for damage diagnosis, including detection and localization in complex composite structures. Lamb wave based active sensing for damage diagnosis is investigated first. The propagation of Lamb wave in stiffened carbon fiber polymer matrix composite panels is characterized. A two step damage detection and characterization approach, which uses both pulse-echo and pitch-catch active sensing schemes, is presented for the identification of delaminations in the stiffened composite panels. The Matching Pursuit Decomposition (MPD) algorithm is used for the representation of the sensor signals in the time-frequency domain. The delaminations are detected by identifying the converted Lamb wave modes in the time-frequency domain. The MPD algorithm is further used to assess the delamination location in composite structures. Due to the redundancy of the PZT sensor array, a probabilistic location estimation algorithm is used to estimate the confidence range of the delamination in the composite structures.
Keywords Algorithms
Composite structures
Confidence level
Damage diagnosis
Integrated systems
Lamb wave
Mpd(Matching pursuit decomposition)
Pursuit courses
Shm(Structural health monitoring)
Structural properties

Source Agency Non Paid ADAS
NTIS Subject Category 57E - Clinical Medicine
57W - Stress Physiology
Corporate Author Arizona State Univ., Tempe.
Document Type Technical report
Title Note Final rept. 3 Feb 2009-11 May 2012.
NTIS Issue Number 1303
Contract Number FA9453-09-1-0316

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader