Experimental and numerical investigations of axisymmetric wave propagation in cylindrical pipe filled with fluid

摘要: Acoustic wave propagation in fluid-filled cylindrical pipe with arbitrary thickness is investigated numerically and experimentally. The vibrational properties of the coupled fluid-pipe system are evaluated by a layerwise approach, which similar to finite-strip method. In this thick wall divided into number thin layers direction. displacements direction for each layer approximated linear-shape functions. governing equation obtained using an energy minimization principle. dispersion curves, distribution between contained fluid, displacement fields examined. dependence curves on discussed. Two PZT ring transducers adhered outer surface used as source receiver, respectively. propagating waves generated burst signals measured. To localize transient signal both time frequency domains, discrete wavelet transform applied decomposing receiving several components. Each component limited narrower bandwidth. Therefore frequency-dependent group velocity estimated. experimental numerical results compared.