Broadband and enhanced piezoelectric-electromagnetic energy harvesting system based on the laminated composite ABH beam under a steady-state harmonic excitation

To meet the rising demand for clean energy, this study introduces a hybrid PEH-EEH harvester based on the laminated composite ABH beam. This study designed the structural configuration of the ABH tip-magnet mass block. The magnet mass block facilitates electromagnetic conversion of vibrational energy and enhances strain. Simultaneously, the modal characteristics of the ABH beam were optimized through mass concentration effects, enhancing piezoelectric energy harvesting performance. The design improves vibration concentration and structural strength compared to traditional ABH structures. At the third resonance peak, the piezoelectric-mass-ABH tip energy harvesting system reaches a peak-to-peak open-circuit voltage of 21.53 V. Under similar excitation conditions, its performance surpasses that of systems with only piezoelectric elements by 84%. An adjustable boundary is introduced, allowing adaptive control of the operating frequency range. Both theoretical and experimental results show that the proposed ABH energy harvester integrated system offers significant performance improvements. The work provides a new solution for developing high-performance, wideband vibration energy harvesters.