Abstract
A method for developing an automatic fine-tuning controller for matching a specification in the frequency domain is developed for the wind simulation equipment at the Offshore Technology Research Center (OTRC). A test signal synthesis method for realizing a time series from power spectral density is presented. A power spectrum estimator is developed for analyzing aerodynamic data and computing power spectral density. A control method is developed for comparing output spectra with the specification and updating the input spectra for upcoming iterations. Windowing techniques and filtering are discussed to provide smoothing and noise suppression. The results of numerical simulations are presented and optimization of a relaxation parameter to suppress the effects of noise is performed. A lower final error is possible with the optimal value of the parameter. Convergence is quickest with the smallest possible value but more stable with an optimal value in the presence of noise.
Miller, Mark Alan (1994). Automatic fine-tuning and wind simulation at the Offshore Technology Research Center (OTRC). Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1994 -THESIS -M649.