Force Identification Based on Sensitivity in Time Domain

A new method is proposed for identifying the time history of the input excitation using the dynamic response of the structure. The sensitivities of dynamic response with respect to the parameters of the input force are calculated in the time domain. These sensitivities are used to update the paramet...

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Bibliographic Details
Published in:Journal of engineering mechanics 2006-10, Vol.132 (10), p.1050-1056
Main Authors: Lu, Z. R, Law, S. S
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
Solid mechanics
Structural and continuum mechanics
TECHNICAL PAPERS
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:A new method is proposed for identifying the time history of the input excitation using the dynamic response of the structure. The sensitivities of dynamic response with respect to the parameters of the input force are calculated in the time domain. These sensitivities are used to update the parameters of the identified force(s) iteratively in the inverse analysis. Both sinusoidal excitation and impulsive force are used in the simulation study. Three numerical examples show that the proposed method is effective and highly accurate in identifying the force(s). Both the effects of measurement noise and modeling error of the structure are found negligible on the accuracy of the identified force in the studies. The proposed method is further verified with laboratory measurements from a steel bar under sinusoidal excitation with very good results.
ISSN:0733-9399
1943-7889
DOI:10.1061/(ASCE)0733-9399(2006)132:10(1050)