Autonomous Resonance‐Tuning Mechanism for Environmental Adaptive Energy Harvesting. Issue 3 (28th November 2022)

• Record Type: Journal Article
• Authors: Lee, Dong‐Gyu; Shin, Joonchul; Kim, Hyun Soo; Hur, Sunghoon; Sun, Shuailing; Jang, Ji‐Soo; Chang, Sangmi; Jung, Inki; Nahm, Sahn; Kang, Heemin; Kang, Chong‐Yun; Kim, Sangtae; Baik, Jeong Min; Yoo, Il‐Ryeol; Cho, Kyung‐Hoon; Song, Hyun‐Cheol
• Is Part Of: Advanced science. Volume 10:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-28
• Subjects: adaptive clamps -- autonomous resonance‐tuning -- energy harvesting -- piezoelectric -- tuning beam; Science -- Periodicals; 505
• DOI: 10.1002/advs.202205179
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: An innovative autonomous resonance‐tuning (ART) energy harvester is reported that utilizes adaptive clamping systems driven by intrinsic mechanical mechanisms without outsourcing additional energy. The adaptive clamping system modulates the natural frequency of the harvester's main beam (MB) by adjusting the clamping position of the MB. The pulling force induced by the resonance vibration of the tuning beam (TB) provides the driving force for operating the adaptive clamp. The ART mechanism is possible by matching the natural frequencies of the TB and clamped MB. Detailed evaluations are conducted on the optimization of the adaptive clamp tolerance and TB design to increase the pulling force. The energy harvester exhibits an ultrawide resonance bandwidth of over 30 Hz in the commonly accessible low vibration frequency range (<100 Hz) owing to the ART function. The practical feasibility is demonstrated by evaluating the ART performance under both frequency and acceleration‐variant conditions and powering a location tracking sensor. Abstract : To maximize the harvesting power, the resonance frequency of the energy harvester must match that of ambient vibration. The novel autonomous resonance‐tuning (ART) energy harvester that automatically adjusts its resonance frequency in accordance with ambient vibrations under low‐frequency (<100 Hz) without any external assistance or human intervention is proposed for the first time.