A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Issues on the durability of piezoceramic transducers for in situ SHM using acousto ultrasonics
It is expected that acousto-ultrasonic techniques applied using structurally integrated low-profile piezoceramic transducers will eventually provide an effective low-cost and reliable means of non-destructive inspection for high value engineering assets like aircraft. One of the key attractions of this form of structural inspection is that broad diagnostic coverage can be achieved with a relatively low sensor density, which in principle should result in a relatively low system footprint and thereby alleviate some of the system certification challenges associated with the application of structural health monitoring technology to aircraft. Another critical aspect from a certification viewpoint is system reliability, which is determined in large part by the stability of piezoceramic materials under environmental and mechanical loading. This paper describes some experimental work addressing the effects on the performance of piezoceramic wafer transducers of exposure to a mechanical loading spectrum derived from a structurally critical location on a military aircraft. It proposes some simple metrics that provide a promising basis for diagnosing certain forms of transducer degradation and also describes a novel means of mitigating load transfer from a host into a bonded transducer allowing piezoceramic materials to be applied in applications where the mechanical loading would normally lead to a rapid deterioration in performance.
Issues on the durability of piezoceramic transducers for in situ SHM using acousto ultrasonics
It is expected that acousto-ultrasonic techniques applied using structurally integrated low-profile piezoceramic transducers will eventually provide an effective low-cost and reliable means of non-destructive inspection for high value engineering assets like aircraft. One of the key attractions of this form of structural inspection is that broad diagnostic coverage can be achieved with a relatively low sensor density, which in principle should result in a relatively low system footprint and thereby alleviate some of the system certification challenges associated with the application of structural health monitoring technology to aircraft. Another critical aspect from a certification viewpoint is system reliability, which is determined in large part by the stability of piezoceramic materials under environmental and mechanical loading. This paper describes some experimental work addressing the effects on the performance of piezoceramic wafer transducers of exposure to a mechanical loading spectrum derived from a structurally critical location on a military aircraft. It proposes some simple metrics that provide a promising basis for diagnosing certain forms of transducer degradation and also describes a novel means of mitigating load transfer from a host into a bonded transducer allowing piezoceramic materials to be applied in applications where the mechanical loading would normally lead to a rapid deterioration in performance.
Issues on the durability of piezoceramic transducers for in situ SHM using acousto ultrasonics
Probleme der Haltbarkeit von piezokeramischen Wandlern zur In-Situ-Bauwerksüberwachung mittels Akustoultraschall
Rajic, N. (author) / Tsoi, K.A. (author) / Rosalie, C. (author)
2010
10 Seiten, 6 Bilder, 13 Quellen
Conference paper
Storage medium
English
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