Pyroshock Qualification Tests of the Electronics Equipments for the Upper Stage of KSLV-I

Paper number

IAC-07-C2.I.02

Author

Mr. Jong-Chan Park, Korea Aerospace Research Institute, Korea

Coauthor

Dr. Young-Doo Chun, Korea Aerospace Research Institute, Korea

Coauthor

Dr. Eui Seung Chung, Korea Aerospace Research Institute, Korea

Coauthor

Dr. Jeong Joo Park, Korea Aerospace Research Institute, Korea

Coauthor

Dr. Gwang-Rae Cho, Korea Aerospace Research Institute, Korea

Year

2007

Abstract

Generally, explosive pyrotechnic devices are used extensively in space launch vehicles for the purpose of stage separation, payload fairing separation, etc. The shock environment induced by explosive pyrotechnic devices is known pyrotechnic shock or pyroshock. This can be characterized by the quite high peak acceleration during the extremely short duration, which are able to damage or fail the electric/electronic parts in electronic equipments. For the mission success of a space launce vehicle, therefore, all electronic equipments should survive and the engineers have assurance of the fine functionality of them in any pyroshock environments occurred in any phases during mission flight. In this reason pyroshock tests are normally carried out as a category of the qualification tests for the subsystem and the units as well, in many space launch vehicle programs. The pyroshock test for a subsystem of a launch vehicle is generally done by using the real explosive pyrotechnic devices in scaled or real-scaled models. However it can be dangerous and expensive so the tests for unit level are done by using the pyroshock simulator commonly.
The pyroshock tests as the unit qualification have been performed for the electronic equipments which would be installed in the upper stage of KSLV(Korea Space Launch Vehicle)-I, which is developed currently in Korea. As results of the test so far, totally seven equipments are failed to be qualified out of 32 electronic equipments. There are several causes of the failures to be revealed: 5 equipments are failed due to the pole transfer, which is occurred when shock is induced, of the relay used in the equipments, the one of the rest two causes is a oscillator breakage and the last one is the abnormal operation of SRAM(Static RAM). The test facility, Pyroshock Simulator, is designed to create the shock spectrum induced by a resonance plate through the impact of a projectile hammer released by compressed springs. The shock levels occurred at qualification tests are compared with the shock levels generated at the 1st real-scaled PLF separation test. By this work, the correlation between both is investigated. As results, pyroshock qualification tests simulate the real-scaled PLF separation tests using the real explosive pyrotechnic devices similarly and have the repeatability for qualification test.

Abstract document

IAC-07-C2.I.02.pdf

Manuscript document

IAC-07-C2.I.02.pdf (🔒 authorized access only).

To get the manuscript, please contact IAF Secretariat.