Abstract
This paper deals with vibrational characteristics of self-excited pressure oscillations generated in a collapsible tube when the internal water flow rate becomes large and the transmural pressure is sufficient to produce a large deformation in the tube crosssection. Experiments were performed for various values of internal water flow rate, tube length and transmural pressure; and two types of self-excited pressure oscillations were found. One was low-frequency oscillation having a large pressure amplitude occured when the transmural pressure was medium, and the other was high-frequency oscillation with moderate amplitude occurring when the transmural pressure was large. Theoretical investigation based on Ohba's theory revealed that the low-frequency oscillation is the same type as that already reported but the high-frequency one is a new type of self-excited oscillation in a collapsible tube.
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