Energy harvesting characteristics on curvature based PVDF cantilever energy harvester due to vortex induced vibration

Woo-Jin Song; Jongkil Lee

doi:10.7776/ASK.2024.43.2.168

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2024 Vol.43, Issue 2 Preview Page Next Page

Research Article

Energy harvesting characteristics on curvature based PVDF cantilever energy harvester due to vortex induced vibration 곡면을 가진 외팔보형 PVDF 에너지 하베스터의 와류유기진동으로 인한 에너지 수확 특성

31 March 2024. pp. 168-177

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Abstract

When designing an underwater Piezoelectric Energy Harvester (PEH), Vortex Induced Vibration (VIV) is generated throughout the cantilever through a change in curvature, and the generation of VIV increases the vibration displacement of the curved cantilever PEH, which is an important factor in increasing actual power. The material of the curved PEH selected a Polyvinyline Di-Floride (PVDF) piezoelectric film, and the flow velocity is set at 0.1 m/s to 0.50 m/s for 50 mm, 130 mm, and 210 mm with various curvatures. The strain energy change of PEH by VIV was observed. The smaller the radius of curvature, the larger the VIV, and as the flow rate increased, more VIV appeared. Rapid shape transformation due to the small curvature was effective in generating VIV, and strain energy, normalized voltage, average power, etc. To increase the amount of power of the PEH, it is considered that the average power will increase as the number of curved PEHs increases as well as the steep curvature is improved.

Keywords

Underwater energy harvester

Energy harvesting measurement

Curvature based cantilever

Vortex induced vibration (VIV)

Polyvinyline Di-Floride (PVDF)

수중 압전 에너지 하베스터(Piezoelectric Energy Harvester, PEH) 설계시 곡률변화를 통해 외팔보형 전체의 와류유기진동(Vortex Induced Vibration, VIV)을 생성시키고, VIV의 생성으로 곡면형 외팔보 PEH에 진동 변위가 증가한다는 것은 실제 전력을 증대 시키는 데 중요한 요소이다. 해석 모델인 곡면형 PEH의 재질은 Polyvinyline Di-Floride(PVDF) 압전 필름으로서 곡률이 다양한 50 mm, 130 mm, 210 mm 모델에 유속은 0.1 m/s ~ 0.50 m/s로 정하여 VIV에 의한 PEH의 스트레인 에너지 변화를 관찰하였다. 곡률 반경이 작을수록 큰 폭의 VIV가 나타났고, 유속이 증가할수록 VIV가 많이 나타났다. 작은 곡률로 인한 급격한 형상변환이 VIV의 생성에 효과적이었고 스트레인 에너지, 정규화 발생 전압, 평균 전력 등은 곡률이 증가할수록 감소하였다. PEH 자체의 전력량을 증대시키기 위해 급한 경사의 곡률 개선뿐만 아니라 곡률형 PEH의 개수가 늘어남에 따라 평균 전력도 상승할 것으로 사료된다.

키워드

수중 에너지 하베스터

에너지 하베스팅 측정

곡면 외팔보

와류유기진동

Polyvinyline Di-Floride (PVDF)

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 43
No :2
Pages :168-177
Received Date : 2023-12-20
Accepted Date : 2024-02-01
DOI :https://doi.org/10.7776/ASK.2024.43.2.168

The Journal of the Acoustical Society of Korea 한국음향학회지 ISSN:1225-4428(Print) 2287-3775(Online)

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