The Dynamic Behaviour of a Finite Length Straight Pipe Subject to Waterhammer : 1st Report, For Small Elastic Deformation of the Pipe Wall

概要

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A practical mathematical model capable of predicting the dynamic strains in a finite length straight pipe subject to waterhammer has been investigated. The membrane shell theory, neglecting the radial inertial force, is employed and calculated numerically by the "two step Lax-Wendroff method" after having transformed the displacement equation of motion into equations of conservation for strain and particle velocity. An experimental investigation was carried out for two oil-filled straight pipes whose boundary conditions were open-fixed/closed-fixed and open-fixed/closed-free, and pressure fluctuations and axial and circumferential dynamic strains were measured. The experimental and analytical results are discussed in detail, and the proposed mathematical model and method of calculation are found to be sufficiently appropriate to evaluate the dynamic response of the pipe wall.
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