- P 9 Q 0 R 0 S 1 T 0 Asap 1 (73 KiB) Viewed 22 times
m = 1P kg rubber felt Figure Q1(b)
P=9 Q=0 R=0 S=1 T=0 ASAP
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P=9 Q=0 R=0 S=1 T=0 ASAP
P=9 Q=0 R=0 S=1 T=0 ASAP
Between a solid mass of 1P 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 3Q00 N/m and an equivalent viscous damping coefficient of 11R Ns/m. The felt slab has a stiffness of 12,800 N/m and an equivalent viscous damping coefficient of 1 TO 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 (12 marks)
m = 1P kg rubber felt Figure Q1(b)
Between a solid mass of 1P 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 3Q00 N/m and an equivalent viscous damping coefficient of 11R Ns/m. The felt slab has a stiffness of 12,800 N/m and an equivalent viscous damping coefficient of 1 TO 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 (12 marks)
m = 1P kg rubber felt Figure Q1(b)
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