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When a high-speed penetrator carrying detection equipment penetrates planetary bodies at high speed， the scientific instruments in it are impacted by high g value and easily damaged. The buffer protection structure for scientific instrumentation is essential for improving the survival rate. This work suggested a penetrator with a multi-layered energy absorbing structure where the foam-filled thin-wall structure (abbreviated as FTS) is applied to the penetrating vibration-damping structure to improve the survival rate of the penetrator. The penetrating process of the penetrator into the planetary medium is simulated in LS-DYNA. Then， the reliability of the penetrator’s finite element model was verified by the impulse response test and simulation. The results suggest that FTS has a beneficial effect on isolation impact and energy absorption and provides an important solution for the research and development of penetrator engineering prototype. [ABSTRACT FROM AUTHOR]

A prototype of a small penetrator was designed to provide a high-speed impact structure for lunar exploration. The advantages of this penetrator structure are lightweight， high stiffness and good vibration damping performance， which makes the penetrator effectively impact a small celestial body. The method of combining theory， numerical analysis and simulation was used for the analysis of the impact response of small penetrator and the penetration process of normal incidence and oblique incidence， so as to explore the needs of impact protection in the field of deep space exploration. The results show that the as-designed penetrator can effectively guarantee the existence of the internal components， and that the acceleration response of internal instrument module is less than the input value， which proves the effect of vibration damping. Moreover， the structure can protect the internal instrument so that it can work normally after the impact. [ABSTRACT FROM AUTHOR]