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| 1 | Stochastic model updating using distance discrimination analysis显示文摘This manuscript presents a stochastic model updating method, taking both uncertainties in models and variability in testing into account. The updated finite element(FE) models obtained through the proposed technique can aid in the analysis and design of structural systems. The authors developed a stochastic model updating method integrating distance discrimination analysis(DDA) and advanced Monte Carlo(MC) technique to(1) enable more efficient MC by using a response surface model,(2) calibrate parameters with an iterative test-analysis correlation based upon DDA, and(3) utilize and compare different distance functions as correlation metrics. Using DDA, the influence of distance functions on model updating results is analyzed. The proposed stochastic method makes it possible to obtain a precise model updating outcome with acceptable calculation cost. The stochastic method is demonstrated on a helicopter case study updated using both Euclidian and Mahalanobis distance metrics. It is observed that the selected distance function influences the iterative calibration process and thus, the calibration outcome, indicating that an integration of different metrics might yield improved results. | Deng Zhongmin Bi Sifeng Sez Atamturktur | 2014 | Chinese Journal of Aeronautics2014，27，5： | 5 |
| 2 | Estimation of failure probability in braced excavation using Bayesian networks with integrated model updating显示文摘A probabilistic model is proposed that uses observation data to estimate failure probabilities during excavations.The model integrates a Bayesian network and distanced-based Bayesian model updating.In the network,the movement of a retaining wall is selected as the indicator of failure,and the observed ground surface settlement is used to update the soil parameters.The responses of wall deflection and ground surface settlement are accurately predicted using finite element analysis.An artificial neural network is employed to construct the response surface relationship using the aforementioned input factors.The proposed model effectively estimates the uncertainty of influential factors.A case study of a braced excavation is presented to demonstrate the feasibility of the proposed approach.The update results facilitate accurate estimates according to the target value,from which the corresponding probabilities of failure are obtained.The proposed model enables failure probabilities to be determined with real-time result updating. | Longxue He Yong Liu Sifeng Bi Li Wang Matteo Broggi Michael Beer | 2020 | Underground Space2020，5，4： | 2 |
| 3 | The Exploitation and Comprehensive Utilization of Magnesium Resources in Salt Lakes of China显示文摘The changes of demand and market witnessed the continuous revolution and development in the world magnesium industry.Before the 1950s,the development of magnesium mainly attached to the military industry. | BI Sifeng CUI Xiangmei | 2014 | Acta Geologica Sinica(English Edition)2014，88，S1： | 1 |
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