Vibration Control of Nuclear Power Plant Piping System Using Stockbridge Damper under Earthquakes

Table 4

Properties of SBD.

Parameters	SBD (-direction)	SBD (-direction)
Mass ratio	0.022	0.024
Mass (kg)	4.0	4.0
Frequency ratio	0.978	0.977
Damping ratio	0.15	0.15
Messenger cable length (m)	0.24	0.21