Discussion
Arrange the following steps of designing an isolation system in order.
1. Assume a displacement 2. Compute effective stiffness and damping 3. Read the spectrum at the isolated period 4. Check convergence of the displacement
Answer: D
Correct answer: 1, 2, 3, 4
The procedure is iterative because the properties depend on the answer. A displacement is assumed; the effective stiffness and damping at that displacement follow; the spectrum is read at the resulting period to give a new displacement; and the loop is repeated until the assumed and computed values agree. Nothing later can be evaluated before the step above it, which fixes the order.
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