Study on vibro-acoustic transmission characteristics of ship's double-layer acoustic bridge
[Objectives]The inter-ship structure between double-layer shells is an important bridge for the transmission of acoustic vibration from pressure shell to light shell.To reduce the impact on the acoustic vibra-tion radiation level of ships,a double-layer acoustic bridge inter-ship structure is proposed and its acoustic vibration transmission characteristics studied.[Methods]The finite element method is used to establish a finite-length double-layer cylindrical shell acoustic vibration radiation model of an inter-board double-layer acoustic bridge.The differences between the sound and vibration transmission of the double-layer acoustic bridge and those of a traditional single-layer acoustic bridge structure are compared and analyzed.Finally,the influence of the double-layer acoustic bridge's structure,structural parameters and axial distribution spacing on its acoustic radiation and vibration transmission characteristics is revealed.[Results]The results show that the double-layer acoustic bridge connection structure between double cylindrical shells has a better noise reduction effect than the traditional single-layer acoustic bridge structure.The effect of the"2-1"double-layer acoustic bridge structure model on reducing vibration transmission between double cylindrical shells is better than that of"1-2"and"2-2"double-layer acoustic bridge structures.Three different"1-1"double-layer acoustic bridge con-nection structures show similar vibration transmission reduction effects.The spacing of the bottom acoustic bridge ribs and the width of the transverse plate have a great influence on the vibration transmission reduction effect of the double-layer shell structure,while the height of the acoustic bridge has little effect.The closer the axial distribution of double-layer acoustic bridges between double cylindrical shells,the worse the vibration transmission reduction effect.[Conclusions]The results of this study can provide references for the shock absorption and noise reduction design of the inter-board structures of ships.
double cylindrical shellacoustic bridgevibration transmission characteristicsfinite element method
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