This study introduces a novel star-shaped auxetic piezoelectric bimorph higher-order plate for enhanced vibration energy harvesting in fluid environments. The design utilizes a negative Poisson's ratio (NPR) cellular core to improve mechanical compliance and energy conversion efficiency. A comprehensive Multiphysics model couples fluid–structure interaction with electromechanical dynamics, enabling the derivation of analytical frequency responses that explicitly relate electrical power to load resistance. The model demonstrates that the proposed harvester achieves a power output approximately 13% higher than traditional auxetic cores and 172% greater than conventional aluminum-based harvesters. A detailed parametric study reveals how the star-shaped geometry's NPR, material properties, and dimensions synergistically enhance performance and tunability. These results validate the star-shaped auxetic metamaterial as a superior design for efficient, adaptable piezoelectric energy harvesters in complex engineering applications.
Ebrahimi et al. (Sun,) studied this question.