Abstract
In order to reduce the longitudinal vibration of a pipe string for mining manganese nodules from deep sea floors, the pipe string is supported by a linear spring at its upper part. Furthermore, a vibration absorber is attached to the buffer at the lower end of the string. The analyses of the longitudinal vibration and axial stress produced in the string indicate that the mutual effect of the spring support and absorber is very small on the peak amplitude of the longitudinal vibration of the pipe string but considerably large on the maximum axial stress induced in the string. The effect on the stress, moreover, is found to increases with the stiffness of the support. Thus, it can be said that the spring support of the pipe string combined with the effect of the vibration absorber attached to the buffer is a quite useful measure for reducing the stress induced in the pipe string by the vibration.
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