Thesis (M.S.) University of Alaska Fairbanks, 2013The mechanical vibration of an oscillating cantilever plate is studied to determine the interaction of a plate coupled with air and with water. Experimental data was collected and analyzed using multiple methods including Fast Fourier Transform, wavelet analysis, and the Hilbert-Huang Transform (HHT) to characterize the behavior of the plate. The HHT is able to process nonlinear and nonstationary signals and provides more meaningful information compared to the traditionally used Fourier transform for similar applications. The HHT was found to be appropriate and more descriptive for the analysis of coupled fluid-structure systems. Digital Particle Image Velocimetry (DPIV) was also used to analyze the circulation and energy transferred to the fluid.Chapter 1. Introduction -- Chapter 2. Method -- 2.1. Equipment setup -- 2.2. Data collection parameters -- 2.3. Analysis methods -- 2.3.1. Fast Fourier transform -- 2.3.2. Wavelet -- 2.3.3. Hilbert-Huang transform -- 2.3.4. Digital particle image velocimetry -- Chapter 3. Experiment -- 3.1. Design of experiment -- Chapter 4. Analysis -- 4.1. Raw data -- 4.2. Data analysis -- 4.2.1. Waveform -- 4.2.2. Fast Fourier transform -- 4.2.3. Wavelet -- 4.2.4. Hilbert-Huang transform -- 4.2.5. Digital particle image velocimetry -- Chapter 5. Conclusions -- References
