火工分离螺母作动噪声的预示和解耦

The pyrotechnic separation device may bring the risk of exposure to a target due to its excessive actuation noise in its application in underwater weapon. Combined with the finite element and boundary element method, a numerical model is established to predict the actuation noise of pyrotechnical separation nut, which realizes the visualization of transient radiated noise during the separation process. The validity of the numerical model is verified by experiments. The source and generation mechanism of actuation noise are analyzed, and the noise source is quantitatively decoupled by calculating the sound power based on the test and simulation model. The results show that, in the frequency band of 10 ~ 6 000 Hz, the contribution of the impact of inner sleeve is about 50%, and the contribution of the impact of nut flap is about 23% . The contribution of combustion noise is less than 1%, but in the low-frequency band below 400 Hz, the contribution of combustion noise is more significant, about 22% .