A grounding system and method for external multi-layer heat insulation components of a geo satellite

Abstract

The invention discloses a GEO satellite external multilayer thermal insulation assembly earthing system and method. The judgment criterion of the number of multilayer thermal insulation assembly earthing devices on a monoblock multilayer thermal insulation assembly is designed, the GEO satellite external multilayer thermal insulation assembly earthing system comprising the multilayer thermal insulation assembly earthing devices, an earthing ridge and an O-shaped terminal is designed, and an installation method and the test criterion for guiding multilayer thermal insulation assembly earthing implementation are designed. By using the GEO satellite external multilayer thermal insulation assembly earthing system and method provided by the invention, on the premise that the surface charging potential control requirements during GEO satellite in-orbit operation period are met, the defects that a plurality of earthing wires are led out of the multilayer thermal insulation assembly, but limited satellite surface earthing points cannot meet the earthing wire lap jointing requirements for the multilayer thermal insulation assembly can be overcome; and the surface charging and discharging risks of the GEO satellite can be reduced, and GEO satellite in-orbit abnormal situation caused by surface charging and discharging effects is greatly relieved.

Description

technical field [0001] The invention relates to a grounding system and method for an external multilayer heat insulation component of a GEO satellite, and belongs to the technical field of satellite space environment effect protection. Background technique [0002] During the operation of GEO satellites in orbit, they will encounter complex space environments, including surface charged environments. Satellites at GEO altitudes are bombarded with energetic electrons and protons from space, charged particles from the space plasma created by the solar wind from Earth's dark side. This type of electron and proton energy is the surface charging effect of the GEO satellite, and its charging potential can reach 10,000V to 20,000V. When the charging potential generated by different parts of the satellite has a certain potential difference and exceeds a certain threshold, surface electrostatic discharge will occur. Foreign measurement results show that the peak current of surface el...

AI Technical Summary

Problems solved by technology

[0006] The grounding method of the external multilayer heat insulation components adopted by existing GEO satellites is direct grounding (that is, the grounding device of the multilayer heat insulation components on the multilayer heat insulation components is directly connected to the grounding point on the surface of the satellite with a grounding wire), usually There are many grounding wires drawn from the multi-layer heat insulation component, but the number of grounding points on the satellite surface is very small, resulting in too many ○-shaped terminals being overlapped on the same satellite surface grounding point or some grounding wires are not overlapped at all. , burying the risk of anomalies caused by surface charging and discharging effects during the GEO satellite’s in-orbit operation, which has been proved by the in-orbit anomaly statistics of many GEO satellites

[0007] In the process of grounding the external multi-layer heat insulation components of the existing GEO satellites, due to incorrect installation methods, it is easy to cause damage to the multi-layer heat insulation components, which in turn affects the thermal control performance of the multi-layer heat insulation components; due to unclear test criteria, It is easy to cause the grounding of multi-layer heat insulation components to fail to meet the requirements of low-resistance discharge channels for electrostatic charges, and cannot play the role of the grounding system in controlling the surface charging potential

[0008] Practice shows that the existing grounding system and method of GEO multi-layer insulation components cannot fully meet the requirements of surface charging potential control

When the number of grounding wires drawn from the multi-layer heat insulation components is large and concentrated, and the number of grounding points on the satellite surface is small, the disadvantages of the existing grounding system and method are more prominent, which cannot meet the requirements of GEO satellites for long life, high reliability requirements

Images