ADVANCED MEASUREMENTS IN STAR SPACE PROJECT ON STRUCTURAL HEALTH MONITORING

Ioan Ursu, Adrian Toader, Daniela Enciu, Dan Mihai Ştefănescu

Abstract

Accurate specimens representing aluminum spacecraft structures with piezoelectric wafer active sensor (PWAS) bonded on them were subjected to extreme temperature variations and radiations. The structure itself is affected by mechanical damages caused by fatigue and aging. The signature of structure’s health is the real part of electromechanical impedance spectroscopy (EMIS) curves of a PWAS bonded on structure. Based on these EMIS records, damage metrics were calculated as root mean square deviation from healthy to damaged specimen. This paper presents a concise description of four investigative measurements, carried out with advanced electronic, optical and acoustic means.

Keywords

piezoelectric wafer active sensors, electro-mechanical impedance spectroscopy, scanning laser Doppler vibrometer, digital and scanning acoustic microscope

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IMEKO-WC-2015-TC22-439.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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