Abstract
To solve the problem of large operating noise of existing pyrotechnic separation devices, a new low-noise pyrotechnic separation device is designed by changing the utilisation mode of pyrotechnic separation, using micro gas pyrotechnic as heat sources, and shape memory alloy material to convert heat energy into mechanical energy. The results showed that the separation time was 1.526 s when the preload was 20 kN, and the maximum shock response was 319 G (2268 Hz) for 100 Hz–100 kHz. When used underwater, the maximum sound pressure level is 106.9 dB at 12,698 Hz and 98.5 dB from 10 Hz–5 kHz. Compared with a conventional separation nut, the frequency band sound pressure level can be reduced by more than 70 dB, realising underwater low-noise separation.
Highlights
Explosive bolts and separation nuts are widely used in aerospace, missile weapons and underwater vehicle separation systems,[1,2] using the energy driving mechanism of a charge explosion or combustion to complete specific functions
Mechanical noise is the noise generated by the collision between the moving parts of the pyrotechnic separation device to excite the vibration of the housing of the pyrotechnic separation device
Compared with the separation nut, the frequency band sound pressure level is reduced by 76 dB from 10–15 kHz, indicating that the low-noise pyrotechnics separation device design offers good noise reduction performance
Summary
Explosive bolts and separation nuts are widely used in aerospace, missile weapons and underwater vehicle separation systems,[1,2] using the energy driving mechanism of a charge explosion or combustion to complete specific functions. Non-explosive separation devices mainly include polymer driving devices, thermal cutting devices, electric drive reel devices and shape memory alloy (SMA) deviees.[9,10,11,12,13] Separation mechanisms based on SMA offer simplicity, repeatability, adjustability and unique material characteristics They have been used in aerospace[14,15] as an alternative to pyrotechnic separation devices. Conventional pyrotechnic separation devices involve combustion or explosion of energetic materials, a motion collision of the mechanism and the release of strain energy in the process of work to produce high-frequency and high-amplitude pyrotechnic shock and separation noise. According to the different excitation force, the operating noise of the pyrotechnic separation device mainly includes the combustion noise of energetic materials and mechanical noise
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