02714nam a2200397 4500 20260818085720.0 220798 th eng .b10180990 AIT Thesis no.ST-91-01 Bui Thanh Tam Damping identification of structure using free vibration data Bangkok : Asian Institute of Technology, 1991 55 p. Thesis ; no. ST-91-01 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. Structural dynamics Statistical methods Damping (Mechanics) Yamaguchi, Hiroki, Chairperson Karasudhi, Pisidhi, Examination Committee Maekawa, Koichi, Examination Committee Government of Australia, Scholarship Donor Asian Institute of Technology. Thesis ; no. ST-91-01 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B17694 .b10180990 mnait s 240411 2 951012 m a s 0 mnait mnarc 22 40 Barcode : 30050120692263 CREATED : 2014-02-04 RECORD # : i12786172 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160022710 CREATED : 2016-04-04 RECORD # : i12921956 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 25427 25427 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.ST-91-01 30050120692263 2026-08-18 08:57:20 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ST-91-01 30050160022710 2026-08-18 08:57:20 1 2026-08-18 40