Abstract
This article demonstrates the use of guided elastic waves (GEW) for multiple-in and multiple-out (MIMO) data communication in the framework of a structural health monitoring (SHM) system. Therefore, miniaturized low-voltage communication nodes have been developed. They are arranged in a spatially distributed and permanently installed network. Wireless exchange of encoded information across a metallic plate and a stiffened carbon-fiber reinforced plastics (CFRP) structure is investigated. A combination of square-wave excitation sequences and frequency-division multiplexing (FDM) is explored for parallel communication with multiple nodes. Moreover, the impact of the excitation-sequence length on the reliability of information transmission is studied in view of future energy-aware application scenarios. The presented system achieves in both studied structures error-free transmission at a data rate of 0.17 kbps (per carrier frequency) with a power consumption of 224 mW.
Highlights
Detecting, localizing and classifying structural defects in an automated manner are the key purposes of conventional structural health monitoring (SHM) systems
Considering Lamb waves in the frequency-domain alleviates the challenges which are due to their inherent intricate propagation behavior and the additional complexity related to the generation of harmonics
Novel miniaturized low-power electronics have been introduced for application as embedded nodes in structural health monitoring systems with dual functionality: inspection and wireless data communication
Summary
Detecting, localizing and classifying structural defects in an automated manner are the key purposes of conventional SHM systems. Lamb waves are one type of GEW, which are sensitively scattered by specific types of damage, including cracks [18], [26], disbonding [21], delaminations [32] or impact damage [17]. They undergo merely moderate energy dissipation and reach comparatively large distances. The technical structure itself functions as the physical layer for wave propagation and communication This new complementary feature might be practical when conventional wireless electromagnetic or cabled communication is
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