Performance Optimization of a Split-Type Low-Shock Separation Bolt

Hwang, Dae-Hyun; Han, Jae‐Hung; Lee, Juho; Lee, YeungJo; Kim, Dong-Jin

doi:10.2514/1.a34783

Cited by 2 publications

(1 citation statement)

References 9 publications

(15 reference statements)

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“…Woo [30] derived a governing equation of a split nut device that consists of combustion and motions of internal moving parts. Hwang [31][32][33] established a simplified mathematical model of gas pressure and contact forces on interfaces of a pyrotechnic pin-puller device, and investigated influences of friction and the amount of propellant on the behavior of the device.…”

Section: Introductionmentioning

confidence: 99%

Modeling and experimental study on dynamics of a gas-driven split nut device

2023

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Separation devices are widely used in satellites and rockets, where mechanical properties of the devices have significant influences on connection and separation behaviors. Compared to a pyrotechnically actuated separation device, a gas-driven separation device employs preloads, instead of explosions, to actuate separation of the aircrafts, which has advantages of reusability and low impacts. Dynamic modeling of the gas-driven separation device can be used to optimize its separation behaviors, where flexibility is considered since preloads stored in deformations play important roles in separations. Complex interactions of interfaces occur during the separation process in a short time, which raises issues of convergence and computational time when a finite element method is in use. In this work, a simplified model of a gas-driven separation device is firstly developed, where flexibility is introduced only on the interfaces of components and their bodies are still rigid. The LZB multi-point method is applied to deal with repeated impacts of the interfaces in the separation process, and a variable-constraint technique is established to rebuild contact-point pairs when contact areas vary. Simulations of the dynamic model describe detailed interactions of the separation process. Results illustrate that the separation time decreases when the preload increases, and the decreasing rate gets lower due to reactions of split nuts. A test bench of the gas-driven separation device is developed, by which experimental results validate that the proposed dynamic model can accurately predict the separation time and speeds at different preloads.

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Section: Introductionmentioning

confidence: 99%

Modeling and experimental study on dynamics of a gas-driven split nut device

2023

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Design and research of a low-noise pyrotechnic separation device

Xiong

Wang

et al. 2021

Journal of Low Frequency Noise, Vibration and Active Control

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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.

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Performance Optimization of a Split-Type Low-Shock Separation Bolt

Cited by 2 publications

References 9 publications

Modeling and experimental study on dynamics of a gas-driven split nut device

Modeling and experimental study on dynamics of a gas-driven split nut device

Design and research of a low-noise pyrotechnic separation device

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