Analysis of Sound Insulation Performance of Double-walled Cylindrical Shells under Plane Wave Excitation
Combining Donnell's thin shell theory and acoustic-structure coupling boundary conditions,a theoretical model of transmission loss through an infinitely long double-walled cylindrical shell was developed in the presence of mean flow by using the modal expansion method.The convergence of the algorithm was analyzed,and the accuracy of the model was verified in comparison with the results in the existing literature.The effects of the incident and azimuthal angles of the plane wave,the inter-shell gap and the mean flow on the shell transmission loss were further investigated The results show that:changes of the incident and azimuthal angles will affect the acoustic-structure coupling characteristics of the system,and the locations of peaks and dips of sound transmission losses are altered evidently in the lower frequency band;the en-largement in the inter-shell gap results in an increase of transmission loss in the middle and high frequency bands,but a de-crease of transmission loss in the low frequency band;a larger mean flow Mach number means higher total sound transmis-sion loss in the mid and high frequency bands.Results of this study may provide a reference for sound insulation perfor-mance regulation of double-layer cylindrical shells.
acousticsdouble-walled cylindrical shellsound insulationplane wavetransmission loss
万方数据
维普
