Q 1(a) Consider the system shown in Figure 1. Assume that any motion of the two masses is vertical. The spring stiffnesses are k, = 1000 N/m and k, = 3000 N/m. Measure the positions of the two masses, from their equilibrium positions, in the ways shown in the diagram. Using free-body diagrams, find their equations of motion. Find the mass and stiffness matrices for the system. 1 kg 10 kg Figure 1

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Q 1(a)
Consider the system shown in Figure 1. Assume that any motion of the two masses
is vertical. The spring stiffnesses are kz = 1000 N/m and k, = 3000 N/m.
Measure the positions of the two masses, from their equilibrium positions, in the
ways shown in the diagram. Using free-body diagrams, find their equations of
motion.
Find the mass and stiffness matrices for the system.
1 kg
10 kg
Figure 1
Q 1(b)
Find the modal frequencies and corresponding mode shapes for the system in
Q1(a).
Q 1(c)
The system in Q1(a) is released from rest at time t = 0 with x, (0) = x2(0) = 10 mm.
Using your solution for Q1(b), find how the two masses move over time t> 0.
Q 1(d)
State any two differences between the idealised model of the system used in Q1(a)
and any real mass-spring system like that being analysed (other than the assumption
stated in Q1(a) that any motion is vertical).
A more accurate model of a real system could be solved using Simulink or
equivalent software. State any one significant reason why you might choose to
analyse an idealised model instead.
Transcribed Image Text:Q 1(a) Consider the system shown in Figure 1. Assume that any motion of the two masses is vertical. The spring stiffnesses are kz = 1000 N/m and k, = 3000 N/m. Measure the positions of the two masses, from their equilibrium positions, in the ways shown in the diagram. Using free-body diagrams, find their equations of motion. Find the mass and stiffness matrices for the system. 1 kg 10 kg Figure 1 Q 1(b) Find the modal frequencies and corresponding mode shapes for the system in Q1(a). Q 1(c) The system in Q1(a) is released from rest at time t = 0 with x, (0) = x2(0) = 10 mm. Using your solution for Q1(b), find how the two masses move over time t> 0. Q 1(d) State any two differences between the idealised model of the system used in Q1(a) and any real mass-spring system like that being analysed (other than the assumption stated in Q1(a) that any motion is vertical). A more accurate model of a real system could be solved using Simulink or equivalent software. State any one significant reason why you might choose to analyse an idealised model instead.
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