Browsing by Subject "Damping ratio"
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Item Dynamic properties of fine liquefiable sand and calcareous sand from resonant column testing(2015-05) Wang, Yaning, Ph. D.; Stokoe, Kenneth H.; Cox, Brady R.The study of the dynamic properties of two specific kinds of granular soils is performed using torsional resonant column testing. The sandy soils are: (1) liquefiable sand from Christchurch, New Zealand, and (2) calcareous sand from Puerto Rico. The effects of isotropic effective confining pressure, shear strain amplitude, void ratio, and total unit weight on the small-strain and nonlinear dynamic properties of both types of sand are presented and discussed. Empirical models from previous studies are examined to determine how well the models fit the test results.Item Synchrophasor based methods for computing the thevenin equivalent impedance of a transmission network between the University of Texas at Austin and the University of Texas PanAm(2011-08) Mohan, Deepak; Grady, W. M.; Santoso, SuryaWith the increase in complexity of modern electricity grids, the implementation of state-estimators has become a vital aspect of stability and contingency analyses for stable and secure power system operation. Transmission line reactance is an important component in the computation of state-estimators. Two models utilizing real-time synchrophasor data and ERCOT load information are proposed to compute Thevenin equivalent reactance. This thesis presents the results of implementing these methods to estimate the equivalent reactance of a transmission network between The University of Texas at Austin and The University of Texas, PanAm.