AI SearchDamping identification of structure using free vibration data
Call Number: AIT Thesis no.ST-91-01 Material type:
TextSeries: Asian Institute of Technology. Thesis ; no. ST-91-01Publication details: Bangkok : Asian Institute of Technology, 1991Description: 55 pSubject(s): Online resources: Dissertation note: Thesis (M.Eng.) - Asian Institute of Technology, 1991 Summary: Quantification of damping is by far the most vexing problem in dynamics of structures, because damping does not refer to a unique physical phenomenon. The ability to estimate damping ratios accurately plays an important role in the design of dynamically sensitive structures. A modern method of system identification, the Ibrahim Time Domain method, is applied to estimate the modal characters of structure. The effect of the white noise on the accuracy of identifying natural frequency and damping ratio is investigate through numerical examples : Single degree of freedom system, three degree of freedom system, and structure with a tuned mass damper (TMD). The results confirm that the accuracy of the solution depends on the number and characteristics of data series, on the number of data points, on the sampling period, on the closeness of natural frequencies, and on the magnitude of damping. The study also shows the advantages of the method over the logarithmic decrement method.
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A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
Thesis (M.Eng.) - Asian Institute of Technology, 1991
Quantification of damping is by far the most vexing problem in dynamics of structures, because damping does not refer to a unique physical phenomenon. The ability to estimate damping ratios accurately plays an important role in the design of dynamically sensitive structures. A modern method of system identification, the Ibrahim Time Domain method, is applied to estimate the modal characters of structure. The effect of the white noise on the accuracy of identifying natural frequency and damping ratio is investigate through numerical examples : Single degree of freedom system, three degree of freedom system, and structure with a tuned mass damper (TMD). The results confirm that the accuracy of the solution depends on the number and characteristics of data series, on the number of data points, on the sampling period, on the closeness of natural frequencies, and on the magnitude of damping. The study also shows the advantages of the method over the logarithmic decrement method.
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