Development of a power generator utilizing chaotic vibrations of a saddle-shaped plate for maintenance free small hydroelectric generation

• Project/Area Number: 25420175
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Dynamics/Control
• Research Institution: Gunma University
• Principal Investigator: Nagai Ken-ichi 群馬大学, その他部局等, 名誉教授 (00110403)
• Co-Investigator(Kenkyū-buntansha): MARUYAMA Shinichi 群馬大学, 大学院理工学府, 准教授 (60344925)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 機械力学 / 機械力学・制御 / 機械力学・計測制御

Outline of Final Research Achievements

Aiming at establishment of an energy harvesting method by generating dynamic-through flow-induced vibrations in an saddle-shaped thin plate with a piezo-elastic sheet, experimental results are presented on flow-induced vibrations of a bi-stable rectangular CFRP laminated curved plate. The plate has two equilibrium configurations, a cylinder and a saddle. Vibration responses of the plate are measured, with changing the angle and speed of the flow. Maximum strain is obtained when the vibration response is accompanied by dynamic snap-through with specific velocity and angle of flow, in which broader frequency components are generated compared with the response without dynamic snap-through. Contributions of vibration modes to the chaotic responses are inspected by the principal components analysis.