An Equivalent Method for Explosion Shock Spectrum of Explosive Objects on Space

Abstract

An equivalent method for on-board initiating explosive device explosion shock spectra includes the steps: (1) acquiring on-board equipment initiating explosive device explosion shock time domain acceleration spectrum values and converting the spectrum values into shock response spectra; (2) acquiring vibration displacement for obtaining different frequency points by the aid of the shock response spectra; (3) accumulating and summing the vibration displacement of each frequency point; (4) acquiring displacement cumulative sum of the ground universal shock response spectra according to on-board applied shock acceleration spectrum values in satellite universal ground impact test and according to the steps (2) and (3); (5) determining the displacement ratio of the shock response spectra of on-board equipment to ground universal shock response spectrum conditions according to the steps (3) and (4); (6) acquiring the shock response spectra equivalent to on-board equipment initiating explosive device explosion shock by the aid of the obtained ratio and universal shock response spectra of on-board equipment ground impact tests.

Description

technical field [0001] The invention relates to an equivalent method for the explosion shock spectrum of pyrotechnics on a planet, which is suitable for a ground shock platform to truly simulate the explosion and shock environment of pyrotechnics on a planet, and to assess and evaluate the influence of the shock environment on products on the planet. Background technique [0002] In order to achieve specific functions, mechanical products such as star and arrow belts, solar wings on the star, antennas, and outriggers need to be unlocked with explosive device devices, and use the load generated by the combustion and explosion of the charge to realize their functions. When the device explodes, it will produce high-level, broadband, and short-term complex oscillating explosive shock loads, which usually propagate in the form of high-frequency stress waves in the structure, which will cause microelectronic chips and component solder joints in spacecraft electronic products. , cr...

AI Technical Summary

Problems solved by technology

[0002] In order to achieve specific functions, mechanical products such as star and arrow belts, solar wings on the star, antennas, and outriggers need to be unlocked with explosive device devices, and use the load generated by the combustion and explosion of the charge to realize their functions. When the device explodes, it will produce high-level, broadband, and short-term complex oscillating explosive shock loads, which usually propagate in the form of high-frequency stress waves in the structure, which will cause microelectronic chips and component solder joints in spacecraft electronic products. , crystal oscillator, electromagnetic relay, etc., which will affect the on-orbit performance of the product

[0003] Due to the lack of accurate and effective engineering analysis methods for the stress and deformation of products under the impact of explosion and impact environment of pyrotechnics, in the design of products, the adaptability under the impact of explosion separation and impact environment can only be considered qualitatively

At present, the electronic equipment with a large shock response in the explosive shock test of pyrotechnic products on the planet needs to be assessed and evaluated for the shock environment, but it is very expensive to use pyrotechnic devices to simulate the explosive shock environment. According to the standards MIL-HDBK-340A, NASA- STD-7003 and GJB 1027A carry out identification tests on products, and the test methods generally adopt the classic shock response spectrum method

However, for products with relatively large impacts near pyrotechnics, the shock spectrum shows that the low-frequency magnitude is low, and some high-frequency frequency peaks are high. It is difficult for pendulums, electric vibration tables and bubble shock tables on the ground to simulate the shock response of this spectrum.

If the shock test is carried out according to the peak value actually measured, due to the limitation of the test equipment, it is difficult to achieve, and it will also cause the shock to pass the test and cause harm to the shock-sensitive devices. Therefore, the shock response of explosive explosives is equivalent to the shock spectrum of the general test specification. relationships matter

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