Vibration and stability of curved pipe stiffened by linear spring conveying fluid

الملخص EN

The vibration analysis and stability of curved pipe with linear spring stiffener for fixed-fixed ends conveying fluid consisting from several of straight pipe elements is investigated by using three dimensional finite element model.

The characteristic matrices consisting of stiffness, inertia, damping and contradictory terms which derived by finite element method and the effect of the internal flow velocity, axial force, Coriolis force and force of spring stiffener in connected elbow are considered.

Some parameters that affect the dynamic characteristic have been studied such as curved pipe angle, location of spring stiffener, diameter ratio and wall pipe thickness.

It is found that the location of spring stiffener would influence the critical flow velocity and the natural frequency of the system.

Where the natural frequency of curved pipe increased with closed the spring stiffener to center of curved pipe as the flow velocity increase.

The results are compared with the numerical approach and gives good agreement of used technique.