This paper presents a two-degree-of-freedom (2-DOF) piezoelectric energy harvesting (PEH) system with a stopper for wideband operation. The proposed system consists of a folded piezoelectric cantilever with a stopper integrated. Two cases are considered where the stopper is placed at the free end of the outer beam and inner beam, respectively. It is shown experimentally that with the proper parametric combination we can move the anti-resonance point outside the two resonant peaks and widen the frequency responses of both the peaks. Large amplitude voltage output over 11 Hz can be obtained when we focused on the dynamics of the inner beam. In addition, it is demonstrated that arranging the stopper at the free end of the inner beam yields better performance than that with the stopper placed at the outer beam. Detailed parametric studies are performed to investigate the influences of the stopper distance, amplitude of base movement, and frequency sweep directions on the voltage output. A maximum power output of 713$\mathrm{\mu }\mathrm{W}$ is obtained.

本文介绍了一种二自由度 (2-DOF) 压电能量收集 (PEH) 系统，该系统带有一个用于宽带操作的止动器。所提出的系统由一个折叠的压电悬臂组成，该悬臂带有一个集成的止动器。考虑两种情况，分别将挡块放置在外梁和内梁的自由端。实验表明，通过适当的参数组合，我们可以将反谐振点移到两个谐振峰之外，并扩大两个峰的频率响应。当我们关注内梁的动力学时，可以获得超过 11 Hz 的大振幅电压输出。此外，证明将限位器设置在内梁的自由端比将限位器设置在外梁上的性能更好。进行详细的参数研究以研究止动器距离、基座移动幅度和频率扫描方向对电压输出的影响。最大功率输出713$\mathrm{\mu }\mathrm{W}$获得。