Power transmission pipes are widely present in industrial applications. Moreover, the physical and mathematical model describing the dynamics of a pipe is similar to that of many mechanical systems such as heat exchangers high-speed magnetic tapes, band saw blades, aerial cable threadlines, and sheet production processes. All previous systems are axially moving systems. The dynamic behaviour of an axially moving system is greatly influenced from the presence of the internal flowing fluid, which affects the pipes dynamics and stability. When a critical value of the axial speed is reached, the first linear natural frequency vanishes; the straight equilibrium position loses stability and bifurcates into new equilibrium states. In the sub-critical speed range, all natural frequencies decrease as the axial speed increases and the vibration modes are complex. In actual operating conditions, pipe lines are subjected to many external disturbances, such as external excitations or dynamic disturbances exerted by the flow fluctuations induced by a volumetric pump. Some example of pump-pipes interactions can be found in literature, that highlight the great influence of pump irregularity on lines stability and system noising. When an oscillating external excitation causes a resonance, very dangerous conditions can be met and the axially moving continuum can undergo to catastrophic failures. The presence of an internal flow can cause divergence and flutter type instabilities. The fluid structures interaction analysis requires a deep investigation of the internal velocity field

Dynamic Stability of a Pipe Subjected to a Pulsating Flow / Catellani, Giulia; Milani, Massimo; Pellicano, Francesco. - STAMPA. - --:(2002), pp. -----. (Intervento presentato al convegno The 2nd International FPNI Ph.D. Symposium on Fluid Power tenutosi a Modena, ITALY nel 3-5 July, 2002).

Dynamic Stability of a Pipe Subjected to a Pulsating Flow

CATELLANI, Giulia;MILANI, Massimo;PELLICANO, Francesco
2002

Abstract

Power transmission pipes are widely present in industrial applications. Moreover, the physical and mathematical model describing the dynamics of a pipe is similar to that of many mechanical systems such as heat exchangers high-speed magnetic tapes, band saw blades, aerial cable threadlines, and sheet production processes. All previous systems are axially moving systems. The dynamic behaviour of an axially moving system is greatly influenced from the presence of the internal flowing fluid, which affects the pipes dynamics and stability. When a critical value of the axial speed is reached, the first linear natural frequency vanishes; the straight equilibrium position loses stability and bifurcates into new equilibrium states. In the sub-critical speed range, all natural frequencies decrease as the axial speed increases and the vibration modes are complex. In actual operating conditions, pipe lines are subjected to many external disturbances, such as external excitations or dynamic disturbances exerted by the flow fluctuations induced by a volumetric pump. Some example of pump-pipes interactions can be found in literature, that highlight the great influence of pump irregularity on lines stability and system noising. When an oscillating external excitation causes a resonance, very dangerous conditions can be met and the axially moving continuum can undergo to catastrophic failures. The presence of an internal flow can cause divergence and flutter type instabilities. The fluid structures interaction analysis requires a deep investigation of the internal velocity field
2002
The 2nd International FPNI Ph.D. Symposium on Fluid Power
Modena, ITALY
3-5 July, 2002
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Catellani, Giulia; Milani, Massimo; Pellicano, Francesco
Dynamic Stability of a Pipe Subjected to a Pulsating Flow / Catellani, Giulia; Milani, Massimo; Pellicano, Francesco. - STAMPA. - --:(2002), pp. -----. (Intervento presentato al convegno The 2nd International FPNI Ph.D. Symposium on Fluid Power tenutosi a Modena, ITALY nel 3-5 July, 2002).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/465711
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