On the Natural Frequency of Tidal Current Power Systems - A Discussion of Sea Testing

Journal Article · Mon Jul 14 00:00:00 EDT 2014 · Applied Physics Letters, 105(2):Article No. 023902

DOI:https://doi.org/10.1063/1.4886797· OSTI ID:1171291

Li, Ye; Yi, Jin-Hak; Song, Huimin; Wang, Qi; Yang, Zhaoqing; Kelley, Neil D.; Lee, Kwang-Soo

In order to study its wet natural frequency (in water) and dry frequency (in air), we conducted a two-year measurement campaign by deploying a full-scale prototype tidal current turbine system. A theoretical model is validated, and reveals the measured wet natural frequency of the device could be 54.6% of the dry frequency. Among short-term physics, inflow turbulence is important in the excitation of system resonances that can lead to fatigue damage and system failure. Among long-term physics, the wet natural frequency is highly dependent on tidal constituents, the semi-diurnal tides (M2 and S2) and diurnal tides (K1 and O1).

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1171291
• Report Number(s): PNNL-SA-100413
• Journal Information: Applied Physics Letters, 105(2):Article No. 023902, Journal Name: Applied Physics Letters, 105(2):Article No. 023902
• Country of Publication: United States
• Language: English