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Variable modal parameter identification for non-linear mdof ...
229 Variable modal parameter identification fornon-linear mdof systemsPart II: Experimental validation and advancedcase Chong and M. Imregun Imperial College of Science Technology and Medicine,Mechanical Engineering Department, ExhibitionRoad, London SW7 2BX, UKTel.: +44 20 7594 7068; Fax: +44 20 7584 1560;E-mail: and 6 June 1999 Revised 5 January 2000 The purpose of Part II is to provide an experimental valida-tion of the methodology presented in Part I and to consider arepresentative engineering case, the study of which requiresa relatively large numerical model. A beam system with cu-bic stiffness type non-linearity was used in the experimentalstudy. The non-linear response was measured at three loca-tions and the underlying linear system was obtained via linearmodal analysis of low-excitation response data. The non-linear parameter variations were obtained as a function of themodal amplitude and the response of the system was gener-ated for other force levels.
Y.H. Chong and M. Imregun / Variable modal parameter identification for non-linear mdof systems – part II 231 17 6 2 Fig. 3. FE model of Beam A.
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