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System Identification by Sub-domain approach
백승민(Sungmin Baek),조맹효(Meanghyo Cho),김기욱(Ki-Ook Kim),김혁(Hyuk Kim),최형길(Hyunggil Choi),최재락(Jearak Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A number of approximate techniques have been developed to determine primary degrees of freedom of the reduced eigenvalue problem. In general, sequential elimination can be used with reliability. But it takes excessively large amount of time to construct a reduced system. To reduce computational time and resources, two-level selection scheme combined with improved sub-structuring method are used. In the present study, nonlinear inverse perturbation method is used to solve inverse problem. It is the form of optimal design problem with the objective function which is the residual error of dynamic equilibrium equations. Design variables are limited not to all the perturbed quantities of the elements in the global domain but only to the perturbed quantities in the particular sub-domain which is expected to possess damages. The present method requires only small number of design variables and convergence in nonlinear problem is much faster than that of a single global system.