Integration of vibration isolation and energy harvesting for a sandwich meta-pipe conveying fluid

This paper is aimed at exploring the potential of a composite meta-pipe conveying fluid for simultaneously suppressing vibration and collecting energy. The pipe features a sandwich design, with the outer layers composed of glass fiber-reinforced composite and the core layer made of carbon fiber-reinforced composite. Meanwhile, the pipe is periodically attached with piezoelectric layers connected with shunting circuits to both trigger frequency band gaps (BGs) and generate electricity. A point defect is further introduced into the pipe by modifying the position and length of the piezoelectric layers, enabling energy localization in the defect segment. Numerical results demonstrate the achieved dual functionality of the proposed fluid-structure interaction (FSI) integrated meta-structure, and reveal the essential relations between vibration isolation and energy harvesting. The FSI and composite effects on the dual functionality are elucidated. More importantly, the findings clarify the distinct roles of defect in energy harvesting across the Bragg scattering (BS) BG and locally resonant (LR) BG, highlighting the effects of different types of defect on the integration performance. This research will facilitate the development of smart pipe structures in engineering applications, and offer new perspectives on the vibration isolation and energy harvesting in FSI systems.