This study verifies the effects of using dynamic vibration absorbers as seismic response vibration control devices for small-bore piping systems. The aim of this study is to reduce the response for each vibration mode by installing dynamic vibration absorbers with adjusted frequency and mounting position, focusing on the primary vibration modes. The dynamic vibration absorbers were installed with adjusted frequencies and mounting positions for the primary vibration modes, and then complex eigenvalue analysis and seismic response analysis were conducted to investigate the increase in damping and reduction in response. From the numerical analysis results using the 3D piping model, it was found that the dynamic vibration absorbers could add damping to the targeted vibration mode and reduce the seismic response. Properly installed dynamic vibration absorbers can reduce maximum responses and improve the seismic margin of the piping systems.
MAEKAWA et al. (Wed,) studied this question.