Numerical study on separation shock characteristics of pyrotechnic separation nuts

Zhao, Hongda; Liu, Wei; Ding, Jian; Sun, Yi; Li, Xiao; Liu, Yizhi

doi:10.1016/j.actaastro.2018.07.040

Cited by 36 publications

(16 citation statements)

References 12 publications

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“…Acceleration time domain excitation is applied to a series of SDOF oscillators with different natural frequencies. The improved slope-invariant digital filter recursive algorithm proposed by Smallwood [28] has become a commonly used numerical algorithm and engineering standard for SRS [29], [30] because of its clear physical meaning, concise algorithm, fast calculation speed, and high computational accuracy.…”

Section: Basic Acceleration Synthesis Methodsmentioning

confidence: 99%

An Improved Adaptive Genetic Algorithm for Optimizing Pyroshock Acceleration Synthesis

2019

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The shock response spectrum (SRS) applied to pyroshock designs and tests for space systems does not include input acceleration time history; therefore, it cannot be used directly in structural nonlinear dynamic analysis before acceleration time history is synthesized. Existing synthesis methods typically rely on certain experimental data. In this study, a combined method for pyroshock acceleration synthesis is presented using a series of wavelets at low frequencies and damped sines at medium-high frequencies in the absence of experimental data. To improve the quality of the synthesized SRS, we develop an improved adaptive genetic algorithm (IAGA) with nonlinear adaptive adjustments of crossover and mutation probabilities. Numerical tests show that combined with the developed IAGA, the new method achieves higher accuracy and practicability in the synthesis of pyroshock acceleration compared with traditional methods. This work is expected to improve the calculation accuracy of spacecraft structure response under pyroshock loads.

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Section: Basic Acceleration Synthesis Methodsmentioning

confidence: 99%

An Improved Adaptive Genetic Algorithm for Optimizing Pyroshock Acceleration Synthesis

2019

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“…The results are plotted in terms of time acceleration and shock response spectrum. The shock response spectrum (SRS) is more popular and widely used as an indicator of the shock severity in aerospace engineering (Zhao et al, 2018).…”

Section: Case Study 1: a Single Platementioning

confidence: 99%

Similitudes for vibration characteristic of composite laminated plates

Zhang

et al. 2021

Journal of Vibration and Control

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Similitude laws can be used to extrapolate the vibration characteristic of a small, inexpensive, and easily tested model into structural behavior for the full-size prototype. In this article, a systematic similitude approach is proposed to predict the natural frequency, mode shape, and vibration response of composite laminated plates. The emphasis of this article is to predict the vibration characteristic of composite laminated plates in an effective and convenient way. Sensitivity analysis (SA) is introduced to improve the prediction accuracy of natural frequency. For distortion similarity, the prediction accuracy is improved close to 5%. Modal assurance criterion (MAC) measures the consistency of mode shapes of the full-size prototype and scaled models. The influence of stacking sequence on mode consistency is investigated. Similitude based on virtual mode and statistical energy (SVMSE) is proposed to extrapolate the transient response of the prototype to simulate the shock environment, such as satellite–rocket separation, etc. In conclusion, the prediction accuracy of natural frequency, mode consistency, and response coincidence are considered comprehensively to extrapolate the vibration characteristic of the full-size laminated plates.

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“…Studies show 7–9 that the shock response in pyrotechnic devices is attributed to three factors: combustion and explosion of energetic materials, mechanical movement of components, and release of preload. Wang et al 10 used ANSYS/AUTODYN to predict the shock response in a pyrotechnic device, and discussed the influence of energetic material mass and preload on the separation shock.…”

Section: Introductionmentioning

confidence: 99%

Influence of multiple structural parameters on buffer performance of a thin‐walled circular tube based on the coupling modeling technique

Jiang

Wang

2022

Int Journal of Mech Sys Dyn

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Pyrotechnic devices are widely used in the aerospace and defense industries. However, these devices generate high‐frequency and high‐amplitude shock responses during their use, compromising safe operation of the system. In this paper, the application of a thin‐walled circular tube as the energy absorber in pyrotechnic devices is investigated. To accurately predict the shock load and the buffer performance of the thin‐walled circular tube, a coupled model connecting the energetic material combustion and finite element simulation is established. The validity of the coupled model is verified by comparing with experiments. Then, the collapse mechanism of the thin‐walled circular tube is studied, and the influence of multiple structural parameters on its buffer performance is analyzed. The results show that the thin‐walled circular tube effectively reduces the shock overload. The maximum shock overload reduced from 572 612g to 11 204g in the studied case. The structural parameters of the thin‐walled circular tube mainly affect the deformation process and the maximum shock overload. The order of importance of structural parameters to the maximum shock overload is determined, among which the wall thickness has the most significant effect.

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Numerical study on separation shock characteristics of pyrotechnic separation nuts

Cited by 36 publications

References 12 publications

An Improved Adaptive Genetic Algorithm for Optimizing Pyroshock Acceleration Synthesis

An Improved Adaptive Genetic Algorithm for Optimizing Pyroshock Acceleration Synthesis

Similitudes for vibration characteristic of composite laminated plates

Influence of multiple structural parameters on buffer performance of a thin‐walled circular tube based on the coupling modeling technique

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