Abstract
In order to reduce the longitudinal vibration of a pipe string for mining manganese nodules from deep sea floors, the pipe string was assumed to be supported by a linear or nonlinear spring at its upper part. The analyses of the longitudinal vibration and stress produced in the pipe string show that the linear-spring support itself tends to increase the resonance frequency of the pipe string as well as the resonance amplitude of buffer at the lower end of the string, while reducing the maximum axial stress of the pipe in case of the small spring constant. The hard-spring support strengthens this tendency and the soft-spring support tends to act reversely.
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