Actuation Noise Prediction and Decoupling of Pyrotechnic Separation Nut

doi:10.12382/bgxb.2022.0641

Abstract

Abstract:

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 10~6000Hz, 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 400Hz, the contribution of combustion noise is more significant, about 22%.

Key words: pyrotechnic separation nut, actuation noise, finite element simulation, boundary element

CLC Number:

TJ45⁺9

YANG Tuo, XIONG Shihui, WANG Jingcheng, ZHAO Xiangrun, WEN Yuquan. Actuation Noise Prediction and Decoupling of Pyrotechnic Separation Nut[J]. Acta Armamentarii, 2024, 45(3): 763-773.

Figures/Tables 26

Fig.1 Schematic diagram of an indirect thrust separation nut

Fig.2 Schematic diagram of test system

Fig.3 Site layout of test system

Table 1 Parameters of sensors and signal acquisition system

名称	型号	量程	频响特性
压力传感器	KISTLER601A	0~25MPa
环形力传感器	CL-YD-305M	0~50kN
声压传感器	INV9204	0~156dB	20~50kHz

Fig.4 Schematic of electric burst pipe

Fig.5 1/2 finite element model of separation nut

Fig.6 Pressure loading surfaces of sleeve(left) and piston(right)

Fig.7 Measured gas pressure-time curve

Table 2 Material modeland parameters of components[19]

部件	材料	密度/(g·cm³)	弹性模量/GPa	泊松比	屈服强度/MPa
外壳	7A04铝	2.85	72	0.33	400
活塞、内套筒、端盖	1Cr11Ni2W2MoV不锈钢	8.00	206	0.30	855
剪切销、垫块、安装块	2A12铝	2.78	69	0.33	255
螺母瓣、螺杆	35CrMnSiA合金钢	7.85	207	0.30	1907

Fig.8 Schematic diagram of preload application

Fig.9 Von-Mises stress

Fig.10 Acoustic boundary element model

Fig.11 Calculation method of structural response and radiated sound field

Fig.12 Von-Mises stress at critical moment in the separation process

Fig.13 Comparison of simulated and experimental preload release curves

Fig.14 Propagation process of transient radiated sound

Fig.15 Comparison of monitored, sound results at monitoring points under different angles

Fig.16 Comparison of monitored sound results at different distance monitoring points

Fig.17 Relationship between sound pressure amplitude and propagation distance

Fig.18 Comparison ofsimulated and experimental sound results

Fig.19 Measured pressure and preload data of steel shear pin-separation nut

Fig.20 Comparison of combustion noise and actuation noise

Fig.21 Comparison of sound powers of combustion noise and actuation noise in frequency domain

Table 3 Contribution of combustion noise in different frequency bands

频率范围/Hz	燃烧噪声功率/W	作动噪声功率/W	贡献量/%
10~400	3.81×10^-6	1.73×10^-5	22.02
400~6000	1.67×10^-6	6.31×10^-4	0.27
10~6000	5.48×10^-6	6.48×10^-4	0.85

Fig.22 Comparison of sound data from different numerical models

Table 4 Sound powers and relative values of different numerical models

模型	10~6000Hz声功率/10^-4W	声功率相对值/%
原模型	2.99	100
Model Ⅰ	2.30	76.92
Model Ⅱ	1.50	50.17

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