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Modal parameter identification based on image streams under disturbance measurement environment
Li Jing, Cheng Wei*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� To aim at structure modal parameter identification,a method based on a sequence of 2D images was proposed��Chose certain feature points from the object whose modal parameter need to be identified��Factorization method was employed on the image streams taken by CCD camera to solve structure from motion problem and obtain motion track of each point��Eigen-system realization algorithm (ERA) was used to identify modal parameter of structure��Especially when the measure equipment,that is CCD camera was disturbed,it can separate disturbance through image streams and get structure motion parameter,so that the identification result was ensured��A simulation model of cantilever beam under disturbed measurement environment was analyzed��It shows that the first five frequencies of the beam coordinating well with the ANSYS calculation result,which offers high significance to the dynamic characteristic identification using optic images in project programs��
Keywords�� disturbance   image streams   factorization method   modal parameter identification     
Received 2009-07-24;
Fund:

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About author: �� ��(1984-),Ů,����������,˶ʿ��,lijing@ase.buaa.edu.cn.
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�� ��, �� ΰ.�Ŷ����������л���ͼ�����е�ģ̬����ʶ��[J]  �������պ����ѧѧ��, 2009,V35(9): 1100-1103
Li Jing, Cheng Wei.Modal parameter identification based on image streams under disturbance measurement environment[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(9): 1100-1103
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2009/V35/I9/1100
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