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Posted: **Fri Apr 29, 2022 10:08 am**

: Q1b Between A Solid Mass Of 19 Kg And Floor Two Slab Of Isolator Natural Rubber And Felt Are Kept In Series As Shown 1 (36.62 KiB) Viewed 21 times

Q1b) Between a solid mass of 19 kg and floor, two slab of isolator, natural rubber and felt are kept in series as shown in Figure Q1(b). The natural rubber slab has a stiffness of 3000 N/m and an equivalent viscous damping coefficient of 110Ns/m. The felt slab has a stiffness of 12100 N/m and an equivalent viscous damping coefficient of 160 Ns/m.

(i) Sketch the single degree of freedom spring-mass-damper system (2 marks) (ii) Determine the undamped and damped natural frequencies of the system in the vertical direction. Neglect the mass of the isolator

m = 1P kg rubber felt Figure Q1(b)