The Experts below are selected from a list of 308112 Experts worldwide ranked by ideXlab platform
Y Ding - One of the best experts on this subject based on the ideXlab platform.
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Structural Response reconstruction with transmissibility concept in frequency domain
Mechanical Systems and Signal Processing, 2011Co-Authors: Jun Li, Y DingAbstract:This paper presents a method for Structural Response reconstruction in the full structure or in a substructure, using the generalized transmissibility concept in frequency domain. The Response reconstruction is based on transforming the measured Responses into Responses at other selected locations with the transmissibility matrix. The use of transmissibility concept in a substructure for Response reconstruction is introduced by taking the interface forces at the interface degrees-of-freedom as input excitations. The First-Order-Hold input approximation is used in the forward Response calculation to improve the accuracy of the dynamic Response analysis. Numerical studies on a seven-storey plane frame structure are conducted to investigate the accuracy and efficiency of the proposed method and the effects of influencing parameters, such as the system sampling duration, sampling rate, sensor numbers and measurement noise are studied. Accurate reconstruction is achieved in all studies when there is significant vibration in the measured Responses.
Jun Li - One of the best experts on this subject based on the ideXlab platform.
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Structural Response reconstruction with transmissibility concept in frequency domain
Mechanical Systems and Signal Processing, 2011Co-Authors: Jun Li, Y DingAbstract:This paper presents a method for Structural Response reconstruction in the full structure or in a substructure, using the generalized transmissibility concept in frequency domain. The Response reconstruction is based on transforming the measured Responses into Responses at other selected locations with the transmissibility matrix. The use of transmissibility concept in a substructure for Response reconstruction is introduced by taking the interface forces at the interface degrees-of-freedom as input excitations. The First-Order-Hold input approximation is used in the forward Response calculation to improve the accuracy of the dynamic Response analysis. Numerical studies on a seven-storey plane frame structure are conducted to investigate the accuracy and efficiency of the proposed method and the effects of influencing parameters, such as the system sampling duration, sampling rate, sensor numbers and measurement noise are studied. Accurate reconstruction is achieved in all studies when there is significant vibration in the measured Responses.
D.m. Lopes - One of the best experts on this subject based on the ideXlab platform.
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ICASSP - Time-frequency methods for analyzing Structural Response data
2000 IEEE International Conference on Acoustics Speech and Signal Processing. Proceedings (Cat. No.00CH37100), 2000Co-Authors: P.r. White, D.m. LopesAbstract:This paper considers the application of various time-frequency methods to Structural Response data. It illustrates that by use of time-frequency methods information that is not evident in impulse or frequency Responses data is brought to light. The shortcomings of classical bilinear time-frequency representations are discussed. A selection of data adaptive time-frequency methods designed as enhancements to the classical techniques are compared and contrasted for this application. It is shown that many of these algorithms fail to give acceptable results when applied to the comparatively complex data sets considered here.
Michael F. Riley - One of the best experts on this subject based on the ideXlab platform.
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An evaluation of higher-order modal methods for calculating transient Structural Response
Computers & Structures, 2003Co-Authors: Charles J. Camarda, Raphael T. Haftka, Michael F. RileyAbstract:The present study evaluates a higher-order modal method proposed by Leung for transient Structural analysis entitled the force-derivative method. This method repeatedly integrates by parts with respect to time the convolution-integral form of the Structural Response to produce successively better approximations to the contribution of the higher modes which are neglected in the modal summation. Comparisons are made of the force-derivative, the mode-displacement, and the mode-acceleration methods for several numerical example problems for various times, levels of damping, and forcing functions. The example problems include a tip-loaded cantilevered beam and a simply-supported multispan beam. The force-derivative method is shown to converge to an accurate solution in fewer modes than either the mode-displacement or the mode-acceleration methods. In addition, for problems in which there are a large number of closely-spaced frequencies whose mode shapes have a negligible contribution to the Response, the force derivative method is very effective in representing the effect of the important, but otherwise neglected, higher modes.
Jack W Baker - One of the best experts on this subject based on the ideXlab platform.
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vector valued intensity measures incorporating spectral shape for prediction of Structural Response
Journal of Earthquake Engineering, 2008Co-Authors: Jack W Baker, Allin C CornellAbstract:Vector-valued ground motion intensity measures (IMs) are developed and considered for efficiently predicting Structural Response. The primary IM considered consists of spectral acceleration at the first-mode Structural period along with a measure of spectral shape which indicates the spectral acceleration value at a second period. For the IM to effectively predict Response, this second period must be selected intelligently in order to capture the most relevant spectral shape properties. Two methods for identifying effective periods are proposed and used to investigate IMs for example structures, and an improvement in the efficiency of Structural Response predictions is shown. A method is presented for predicting the probability distribution of Structural Response using a vector IM while accounting for the effect of collapses. The ground motion parameter e is also considered as part of a three-parameter vector. It is seen that although the spectral shape parameter increases the efficiency of Response predi...
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probabilistic Structural Response assessment using vector valued intensity measures
Earthquake Engineering & Structural Dynamics, 2007Co-Authors: Jack W BakerAbstract:Methods for using scalar and vector ground motion intensity parameters to estimate the probabilistic relationship between ground motion intensity and Structural Response are described and compared. Options include using regression analysis on Structural analysis results from a set of unscaled (or uniformly scaled) ground motions, or fitting a probability distribution to the analysis results from scaled ground motions analysed using incremental dynamic analysis and related methods. Past methods for using scalar ground motion intensity are reviewed, and methods for utilizing improved vector-valued intensity measures (IMs) are proposed. ‘Hybrid’ estimation methods that obtain the benefit of vector-valued IMs using simplified techniques such as careful record selection are also discussed. The results are then combined with models for ground motion occurrence obtained from probabilistic seismic hazard analysis to compute seismic reliability, and the results obtained from the various methods are compared. In general, a tradeoff must be made between the accuracy of the functional relationship between ground motion intensity and Structural Response versus the number of Structural analyses needed for estimation. Copyright © 2007 John Wiley & Sons, Ltd.
