Research On Acoustic Optimization Of Typical Submarine Cabin

Submarine becomes the main battle power of modern navy for its concealment and unexpected attack capability. With the improvement of acoustic stealth performance, the comprehensive combat capability of submarine could be significantly enhanced, which has always drawn navy's highly attention. Traditional design of vibration and noise reduction is flexible isolation, such as elastic support or damping material. While in actual application, large deformation of some equipment or structure was not allowed when running. In addition, steel plates were firmly welded to ensure structural strength as well as water-tightness, so rigid isolation technology, on which the current research is quite few, should be used. Therefore, the following research was carried out in this paper.Based on wave analysis method, the characteristics of vibration wave propagation in typical submarine structure were studied according to impedance variation and wave pattern conversion in heterogeneous structure. And as a starting point,(?)type,(?)type,(?) type composite slabs, rigid vibration isolation mass and vibration-absorption overburden were applied to main transmission path of sound and vibration in typical submarine structure to impede the propagation of principal sound transmission component. Meanwhile, typical submarine pedestal, bulkhead and brace with high transmission loss were presented.According to its structural characteristics, parameterized model of typical submarine cabin was established. Furthermore, structural dynamic optimization formulations of typical submarine pedestal, bulkhead and brace were established on dynamic optimal design theory. And dynamic optimization weakening the vibration of submarine cabin on the restrain conditions of weight, scale, strength as well as installation requirements was carried out.With the introduction of rigid vibration isolation mass to main transmission path of sound and vibration in typical submarine pedestal, bulkhead and brace, the dynamic optimization on discrete variables of sectional dimensions and arranging position of the mass without excessive increase of total weight and scale of submarine cabin as well as destroying structural strength of the cabin was carried out in accordance with dynamic optimal design (?).Based on the boundary element method, the influence of pedestal, bulkhead and composite brace with high transmission loss obtained through dynamic optimization on the vibration and sound radiation of typical submarine cabin was discussed and the effectiveness of the optimal design was verified. The study provides new ideas for vibration and noise reduction design of submarine.