皮囊式衰减器工作特性的数值计算研究OA

The drainage system is essential for the normal operation of underwater vehicles.A bladder-type attenuator is an effective measure for reducing pipeline noise.It also improves the overall stability,reliability,and stealth performance of underwater vehicles.We use the ideal gas equation of state and the Ogden hyperelastic constitutive equation.The arbitrary Lagrangian-Eulerian(ALE)method is adopted to simulate the shapes of the rubber bladder and the fluid domain of the bladder-type attenuator under steady-state operating conditions.The noise transmission loss of the attenuator is calculated using the acoustic simulation software Actran.The results show that the ALE method effectively handles large deformations of rubber materials.It also addresses two-way fluid-structure interaction.Under steady-state operating conditions,the rubber bladder presents a trilobal-like shape.The attenuator significantly suppresses noise over a wide frequency range.