The free-vibration responses of an electric motor of weight \(500 \mathrm{~N}\) mounted on different types of foundations are shown in Figs. 2.114

(a) and (b). Identify the following in each case: (i) the nature of damping provided by the foundation, (ii) the spring constant and damping coefficient of the foundation, and (iii) the undamped and damped natural frequencies of the electric motor.

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x(t), mm 8 0 0.1 0.2 0.3 0.4 0.5 0.6 (a) x(1), mm 8 4 0.1 0.2 0.3 0.4 0.5 t, s (b) FIGURE 2.114 Free vibration responses of damped systems.