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Unsteady aerodynamic modeling based on POD-observer method

Science China(Technological Sciences) 2010年第8期53卷 2032-2037页

作者： YANG Chao,LIU XiaoYan &WU ZhiGang Beijing University of Aeronautics and Astronautics,Beijing 100191,China Beijing University of Aeronautics and Astronautics Beijing China

A new hybrid approach to constructing reduced-order models(ROM)of unsteady aerodynamics applicable to aeroelastic analysis is presented by using proper orthogonal decomposition(POD)in combination with observer *** modes are generated through POD by sampling observations of solutions derived from the full-order *** response in the POD training is projected onto the fluid modes to determine the time history of the modal *** resulting data are used to extract the Markov parameters of the low-dimensional model for modal amplitudes using a related deadbeat *** state-space realization is synthesized from the system's Markov parameters that are processed with the eigensystem realization *** POD-observer method is applied to a two-dimensional airfoil system in subsonic flow *** results predicted by the ROM are in general agreement with those from the full-order *** ROM obtained by the hybrid approach captures the essence of a fluid system and produces vast reduction in both degrees of freedom and computational time relative to the full-order model.

关键词： aeroelasticity aerodynamic modeling proper orthogonal decomposition observer eigensystem realization algorithm

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Mode Shape Identification Using Residues of Measured Offshore Structure Data

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Journal of Ocean University of China 2017年第2期16卷 200-208页

作者： WANG Chao LIU Fushun LU Hongchao College of Engineering Ocean University of ChinaQingdao 266100P.R.China

Compared to traditional mode shape identification methods such as eigensystem realization algorithm(ERA),this article proposes a mode shape identification method based on estimated residues of measured data and the theoretical relationship between the estimated residues and the mode shapes from the state space model is obtained by defining a coefficient matrix.A mass-spring model with five degrees of freedom(DOFs) is utilized to demonstrate the *** numerical results indicate that the estimated residues are the mode shapes of structures,but with a coefficient matrix to maintain consistency with the mode shapes from the *** MATLAB a complicated numerical jacket platform is built to further study the proposed *** results show that mode shapes consistent with those from the ERA could be obtained by taking the defined coefficient matrix into account,which is also demonstrated by a physical beam model that was built at Ocean University of China.

关键词： mode shape residue Prony-based method eigensystem realization algorithm offshore structures

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A　Two－Stage　Approach　of　Integrated　Parameter　Identification　and　State　Estimation

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Journal of Harbin Institute of Technology(New Series) 1995年第4期2卷 81-84页

作者：周露吴瑶华黄文虎闻新

ＡＴｗｏ－ＳｔａｇｅＡｐｐｒｏａｃｈｏｆＩｎｔｅｇｒａｔｅｄＰａｒａｍｅｔｅｒＩｄｅｎｔｉｆｉｃａｔｉｏｎａｎｄＳｔａｔｅＥｓｔｉｍａｔｉｏｎＺＨＯＵＬｕ；ＷＵＹａｏｈｕａ；ＨＵＡＮＧＷｅｎｈｕ；ＷＥＮＸｉｎ（周露）... 详细信息

ＡＴｗｏ－ＳｔａｇｅＡｐｐｒｏａｃｈｏｆＩｎｔｅｇｒａｔｅｄＰａｒａｍｅｔｅｒＩｄｅｎｔｉｆｉｃａｔｉｏｎａｎｄＳｔａｔｅＥｓｔｉｍａｔｉｏｎＺＨＯＵＬｕ；ＷＵＹａｏｈｕａ；ＨＵＡＮＧＷｅｎｈｕ；ＷＥＮＸｉｎ（周露）（吴瑶华）（黄文虎）（闻新）（Ｄｅ...

关键词： ss: Parameter identification state estimation ARX model eigensystem realization algorithm

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