Hydrokinetic Power Harnessing Utilizing Vortex Induced Vibrations through aVirtual c-k VIVACE Model.

Virtual Damper-spring;High-damping VIV;VIVACE Converter;Hydrokinetic Energy Harnessing;Power Envelope;Naval Architecture and Marine Engineering;Engineering;Naval Architecture & Marine Engineering

Lee, JonghunXiros, Nikolaos I. ;

University of Michigan

关键词: Virtual Damper-spring;    High-damping VIV;    VIVACE Converter;    Hydrokinetic Energy Harnessing;    Power Envelope;    Naval Architecture and Marine Engineering;    Engineering;    Naval Architecture & Marine Engineering;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/75975/jonghun_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

An apparatus, VCK, is designed and built to replace the physical damper and springs of the VIVACE (Vortex Induced Vibrations for Aquatic Clean Energy) Converter with a motor-controller system. VIVACE harnesses hydrokinetic energy of water currents by converting it to mechanical energy using VIV. Next, it converts the mechanical energy of cylinders in VIV into electricity. VCK enables conducting high number of model tests quickly as damping and springs are set by software rather than hardware. The controller provides a damper-force and spring-force feedback based on displacement and velocity measurements, thus, introducing no additional artificial force-displacement phase lag, which would bias energy conversion. The damping of even such a simple spring-damper-mass system is strongly nonlinear, even in air, particularly away from the system’s natural frequency and strongly affects modeling near the ends of the VIV synchronization range. System identification in air reveals nonlinear viscous damping, static friction, and kinetic friction. Hysteresis, which occurs in the zero velocity limit, is successfully modeled by a proposed nonlinear dynamic damping model LARNOS (Linear Autoregression combined with NOnlinear Static model). To obtain the optimal VIVACE power at a given current speed, extensive VIV tests are performed with the VCK VIVACE apparatus for Reynolds number 40,000