... turned off Each recorded time history typically consists of an initial phase, a growing phase, a steady-state phase of about 30 s, and a decaying (free vibration) phase of about 60 s A total of 120 ... noting that the optimal U and r can be found analytically in terms of f and f, taking advantage of the fact that the objective function is a quadratic form in U As a result, the best f and f can be ... Yip, graduate student at the University of Hong Kong, participated in the field tests References [1] Satake N, Suda KI, Arakawa T, Sasaki A, Tamura Y Damping evaluation using full-scale data of buildings...