Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14446
Title: Uncertainty of parameters in structural identification by genetic algorithm
Authors: SITHU HTUN
Keywords: Structural Identification; Genetic Algorithms; Monte-Carlo Simulation; Parameter Uncertainty, Normal Distribution, Adaptive Search Strategy
Issue Date: 15-Dec-2004
Source: SITHU HTUN (2004-12-15). Uncertainty of parameters in structural identification by genetic algorithm. ScholarBank@NUS Repository.
Abstract: Uncertainty of model parameters identified by Genetic Algorithm (GA) is addressed in this study. A framework to estimate the uncertainty of parameters is formulated based on the specified threshold value of fitness. In order to interpret the identified results and to estimate the uncertainty of parameters, Monte-Carlo Simulation (MCS) can be adopted. Nevertheless, performing many repetitions of GA in MCS is computationally expensive, especially for systems with many unknown parameters. For this purpose, a GA based adaptive search algorithm that employs adaptive search space zooming strategy is proposed, and later adopted to explore the optimal neighbourhood of the fitness evaluation function. An ensemble of solutions with equal or higher fitness than threshold is used to evaluate the statistics of identified parameters under normal PDF, or Skew-Normal PDF whichever the data is fitted to. Confidence intervals of parameters are calculated from these distributional parameters. Numerical results show good interpretation of identified results with considerable saving in computational time in comparison with the brute-force approach of repeating GA runs.
URI: http://scholarbank.nus.edu.sg/handle/10635/14446
Appears in Collections:Master's Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Uncertainty of Parameters in SID by GA_Part_1.pdf2.71 MBAdobe PDF

OPEN

NoneView/Download
Uncertainty of Parameters in SID by GA_Part_2.pdf3.03 MBAdobe PDF

OPEN

NoneView/Download
Uncertainty of Parameters in SID by GA_Part_3.pdf7.76 MBAdobe PDF

OPEN

NoneView/Download
Uncertainty of Parameters in SID by GA_Part_4.pdf7.09 MBAdobe PDF

OPEN

NoneView/Download
Uncertainty of Parameters in SID by GA_Part_5.pdf8.57 MBAdobe PDF

OPEN

NoneView/Download
Uncertainty of Parameters in SID by GA_Part_6.pdf191.3 kBAdobe PDF

OPEN

NoneView/Download

Page view(s)

302
checked on Jan 19, 2018

Download(s)

717
checked on Jan 19, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.