The vibration isolation and sound radiation reduction characteristic of the micro-floating raft array skin

The control of the drag, noise, and vibration of underwater vehicles has always been a hot topic, causing the study of skin with multiple functions to become a development trend. In the present paper the vibration isolation and sound radiation reduction characteristic of a multiple functions skin, micro-floating raft array skin (MFRAS), are assessed by a mathematical model. The mathematical model is developed based on the thin plate theory and the effective medium theory and validated by the finite element model and reference. The structural parameters of MFRAS have been discussed and optimized by orthogonal experiment design with the evaluation index, the average value of the mean square velocity level. The results show that the MFRAS can isolate the vibration transmission of internal equipment by mismatched impedance between MFRAS and plate, and then reduce the sound radiation. The optimized MFRAS can reduce the mean square velocity level by 1.35 dB and the sound radiation power level by 2.47 dB within the frequency range of 10–2000 Hz compared with the equal weight free damping layer.