With minimal or no damping, the Natural Frequency of a simple mass-spring-damper system, as displayed in Figure 42.1, can be characterized using the following equation: f n = 3.13 (K/W) 1/2 (1) ...

For the building shown to the right, a single-DOF absorber (green) has been added to the top floor (the spring and dashpot are not shown). Here again the absorber is tuned to the first natural ...