KEYWORDS: Structural health monitoring, Sensors, Acoustics, Digital signal processing, Ferroelectric materials, Prototyping, Signal processing, Signal generators, Discrete wavelet transforms, Aluminum
Structural damage for spacecraft is mainly due to impacts such as collision of meteorites or space debris. We present a
structural health monitoring (SHM) system for space applications, named Adverse Event Detection (AED), which
integrates an acoustic sensor, an impedance-based SHM system, and a Lamb wave SHM system. With these three
health-monitoring methods in place, we can determine the presence, location, and severity of damage. An acoustic
sensor continuously monitors acoustic events, while the impedance-based and Lamb wave SHM systems are in sleep
mode. If an acoustic sensor detects an impact, it activates the impedance-based SHM. The impedance-based system
determines if the impact incurred damage. When damage is detected, it activates the Lamb wave SHM system to
determine the severity and location of the damage. Further, since an acoustic sensor dissipates much less power than the
two SHM systems and the two systems are activated only when there is an acoustic event, our system reduces overall
power dissipation significantly. Our prototype system demonstrates the feasibility of the proposed concept.
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