Abstract
This paper presents a novel experimental design for complex structural health monitoring (SHM) studies achieved by integrating 3D printing technologies, high-resolution laser displacement sensors, and multiscale entropy SHM theory. A seven-story structure with a variety of composite bracing systems was constructed using a dual-material 3D printer. A wireless Bluetooth vibration speaker was used to excite the ground floor of the structure, and high-resolution laser displacement sensors (1-μm resolution) were used to monitor the displacement history on different floors. Our results showed that the multiscale entropy SHM method could detect damage on the 3D-printed structures. The results of this study demonstrate that integrating 3D printing technologies and high-resolution laser displacement sensors enables the design of cheap, fast processing, complex, small-scale civil structures for future SHM studies. The novel experimental design proposed in this study provides a suitable platform for investigating the validity and sensitivity of SHM in different composite structures and damage conditions for real life applications in the future.
Highlights
In recent years, 3D printing technologies have emerged as a promising method for creating complex materials and structures
A seven-story specimen with various types of composite bracing was printed for structural health monitoring (SHM) experiments in this study
The results reveal that the multiscale sample entropy (MSE) derived from single laser displacement monitoring on the uppermost story could distinguish the damage of the specimen
Summary
3D printing technologies have emerged as a promising method for creating complex materials and structures. Polylactide (PLA), acrylonitrile butadiene styrene, and a wide range of polymer materials have been used extensively in low-cost Another crucial feature of 3D printing technologies is the availability of 3D printers with multiple printing heads that can fabricate complicated composite structures [7,8]. The idea is to utilize the advantage of high-resolution laser displacement sensors and precise 3D printing technology in damage simulation to demonstrate that a novel structural health monitoring system can be developed for studying complex damage conditions in SHM. A multiscale entropy SHM method was used to demonstrate that the novel experimental approach provides an effective platform for SHM studies for complex structures and composite materials under various damage conditions. This platform serves as a systematic method of studying novel composite materials for civil engineering applications (e.g., novel lightweight composite materials for engineering applications) and investigating their damage
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