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Estimating model parameters of rockfill materials based on genetic algorithm and strain measurements
Li, Shouju,Yu, Shen,Shangguan, Zichang,Wang, Zhiyun Techno-Press 2016 Geomechanics & engineering Vol.10 No.1
The hyperbolic stress-strain model has been shown to be valid for modeling nonlinear stress-strain behavior for rockfill materials. The Duncan-Chang nonlinear constitutive model was adopted to characterize the behavior of the modeled rockfill materials in this study. Accurately estimating the model parameters of rockfill materials is a key problem for simulating dam deformations during both the dam construction period and the dam operation period. In order to estimate model parameters, triaxial compression experiments of rockfill materials were performed. Based on a genetic algorithm, the constitutive model parameters of the rockfill material were determined from the triaxial compression experimental data. The investigation results show that the predicted strains provide satisfactory precision when compared with the observed strains and the strains forecasted by a gradient-based optimization algorithm. The effectiveness of the proposed inversion procedure of model parameters was verified by experimental investigation in a laboratory.
PRECISE SIMULATION OF THE GATE CHARGE IN POWER MOSFET
Baoxia zhou,Zhiming Chen,Shoujue Wang 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Errors in calculation of the gate-source capacitor's charging time in a switch-on process may occur when a characteristic simulation is performed for power MOSFETs by means of SPICE with a commonly used equivalent circuit This is related to the gate-drain capacitor's non-linear charge and discharge behavior An improved model for precise simulation of the switching process of power MOSFETs is presented in this paper The variation of the gate charges with input voltage is calculated accurately.