Vibration Control in Piping System by Dual Dynamic Absorbers : 2nd Report, Realization of Piping Systems with Unresonant Characteristics

Abstract

This paper shows the design method for constructing the piping system with well-suppressed resonance peaks through the wide range of frequency. The piping system is strongly influenced by sources of excitation for blade vibrations since it is usually made flexible and has a low damping property. Thus, many problems, like fatigue damage or noise caused by vibration, happen frequently in the piping system. In order to suppress resonance peaks and obtain high damping in them, dual dynamic absorbers proposed in the previous paper applied. In this paper, it is confirmed theoretically by the transfer matrix method that the piping system with seven resonance peaks within 100Hz is well suppressed by using five dynamic absorbers. The effectiveness of the five optimally designed dual dynamic absorbers is also demonstrated experimentally.