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Propeller-based Underwater Piezoelectric Energy Harvesting System for an Autonomous IoT Sensor System

Title
Propeller-based Underwater Piezoelectric Energy Harvesting System for an Autonomous IoT Sensor System
Author
성태현
Keywords
Energy harvesting; Piezoelectric; Frequency matching; Underwater; Autonomous system; LED light
Issue Date
2020-02
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v. 76, no. 3, page. 251-256
Abstract
While there is a demand for energy harvesting in environments with water, such as rivers, lakes seas, it has been difficult to use energy harvesting, especially piezoelectricity, because of the waterproof problem and the low output scale. Here, we report a propeller-based underwater piezoelectric energy harvester consisting of a propeller, hitting sticks and a piezoelectric module. The hitting sticks spin with a rotating axis connected to a propeller rotated by water flow and hit a piezoelectric cantilever beam. Unlike previous tip mass method, a newly applied technique makes it possible to match a frequency by easily controlling the bending length of a piezoelectric module using an acrylic plate to find the maximum output power. For reliability, we performed an experiment at 1.2 m/s, which is the actual water flow rate of the Han River in South Korea, and a frequency of 24.5 Hz occurred with four hitting sticks. The frequency-matched bending length was 80 mm (acrylic plate length: 10 mm). Then, impedance matching was carried out: At a resistance of 10.8 k omega, an output power of 17 mW(rms) and a power density of 57.4 mW/cm(3) were obtained. This result is one of the highest results in a field of similar piezoelectric energy harvesting devices considering challenging conditions that occur in real environments. Finally, the system was applied to an LED light system, one of applications under water, and succeeded in operating a total of 972 LEDs with only one piezoelectric device. This research proves the potential and the feasibility of applying a piezoelectric energy harvesting system to a real underwater environment.
URI
https://link.springer.com/article/10.3938%2Fjkps.76.251https://repository.hanyang.ac.kr/handle/20.500.11754/161547
ISSN
0374-4884; 1976-8524
DOI
10.3938/jkps.76.251
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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