Intensités vibratoire et acoustique dans les tuyaux

Abstract : The subject of the thesis is the propagation of vibratory and acoustic energy in pipes. The study begins by presenting the general shell theory in tensor notation. Cylindrical shell theories of Flugge and Flugge-Timoshenko are used to describe the vibratory behavior of the pipe. In the Flugge-Timoshenko theory are included the effects of shear and rotary inertia. The fluid inside the pipe is supposed to be acoustic and its behavior is modeled by the wave equation in the cylindrical coordinates. The coupling between the pipe wall and the fluid is taken into account. Elastic waves propagating in the pipe wall and the acoustic waves in the internal fluid spread along the axial sense of the pipe as free, evanescent and attenuated waves. The net transferred energy is composed of structure-borne and fluid-borne contribution. Each of these contributions is the outcome of interaction between free waves on one hand and evanescent waves on the other hand. The interaction of attenuated waves does not produce the net energy flow but creates evanescent stationary waves. Given the coupling between the pipe wall and the internal fluid, the total energy flow may be expressed in terms of pipe wall displacements. This allows developing experimental techniques that determine the total energy flow out of measurement of pipe wall vibrations. Results of tests performed in laboratory conditions and an industrial application on the piping of refrigerating compressor are presented.
Document type :
Theses
Acoustics [physics.class-ph]. Université de Technologie de Compiègne, 1995. French


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Submitted on : Sunday, December 6, 2009 - 7:41:39 AM
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  • HAL Id : tel-00424848, version 1

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Kresimir Trdak. Intensités vibratoire et acoustique dans les tuyaux. Acoustics [physics.class-ph]. Université de Technologie de Compiègne, 1995. French. <tel-00424848>

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