Experimental Study on Frequency Band of Dynamic Vibration Absorber in Pipe Systems

Abstract

This paper investigated the vibration control mechanism of dynamic vibration absorber (DVA) used in pipelines and other chemical equipment. For investigating the broadband characteristics, a pipe-vibration absorber test bench was built and different tests were carried out. The results showed that high mass ratio could widen the frequency bandwidth of effective vibration suppression. A new type of passive ring-shaped DVA with particle damping, employing moving steel particles in single-layer or more-layers boxes was designed, and its vibration suppression capability tested and compared with traditional DVA. The proposed damped DVA could reduce the pipeline double vibration peaks typical of the traditional DVAs. Moreover, results showed that stratifying the box was a useful method to improve the vibration suppression efficiency that increased from 59.5% (single-layer-box case) to 72.5% when two-layers-box were used and to 78.5% with three-layers-box.