title: Three-dimensional piezoelectric vibration energy harvester using spiral-shaped beam with triple operating frequencies.
abstract: This work has demonstrated a novel piezoelectric energy harvester without a complex structure and appended component that is capable of scavenging vibration energy from arbitrary directions with multiple resonant frequencies. In this harvester, a spiral-shaped elastic thin beam instead of a traditional thin cantilever beam was adopted to absorb external vibration with arbitrary direction in three-dimensional (3D) spaces owing to its ability to bend flexibly and stretch along arbitrary direction. Furthermore, multiple modes in the elastic thin beam contribute to a possibility to widen the working bandwidth with multiple resonant frequencies. The experimental results show that the harvester was capable of scavenging the vibration energy in 3D arbitrary directions; they also exhibited triple power peaks at about 16 Hz, 21 Hz, and 28 Hz with the powers of 330 μW, 313 μW, and 6 μW, respectively. In addition, human walking and water wave energies were successfully converted into electricity, proving that our harvester was practical to scavenge the time-variant or multi-directional vibration energies in our daily life.
authors.affiliation: Department of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
authors.forename: Nian
authors.initials: N
authors.lastname: Zhao
authors.affiliation: Department of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
authors.forename: Jin
authors.initials: J
authors.lastname: Yang
authors.affiliation: Department of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
authors.forename: Qiangmo
authors.initials: Q
authors.lastname: Yu
authors.affiliation: Department of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
authors.forename: Jiangxin
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
authors.forename: Yumei
authors.initials: Y
authors.lastname: Wen
authors.affiliation: Department of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
authors.forename: Ping
authors.initials: P
authors.lastname: Li