Discussion
Match the device with the mechanism by which it dissipates energy.
1. Lead rubber bearing 2. Viscous damper 3. Friction damper
P. Fluid through an orifice Q. Slip between clamped surfaces R. Yielding of a metal core
Answer: B
Correct answer: 1-R, 2-P, 3-Q
Three different mechanisms. The lead rubber bearing dissipates by yielding its lead core in shear, cycle after cycle, the lead recrystallising as it goes. The viscous damper forces fluid through an orifice. And the friction damper dissipates through slip between clamped surfaces. Only the second is velocity-dependent, which is the point of the previous item.
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