Abstract
A technique for countermeasures against structure-borne sound in pomp piping system is newly proposed. The technique using two joints that was developed in our previous work has the practical difficulty that the pipe's vibration mode must be measured many times in order to determine the optimum location of joints. In the new technique, after two joints are installed in the arbitrary location, a rigid disk is mounted on the upstream of piping. The pipe vibration can be easily reduced by just adjusting the location of the disk. In this paper, the influence of underwater sound is neglected and the effectiveness of the new technique in reducing vibration in straight-line piping is investigated experimentally and analytically.
