Seal type viscoelastic damper suitable for on-orbit application of spacecraft

Abstract

The invention provides a seal type viscoelastic damper suitable for the on-orbit application of a spacecraft, mainly comprising a connecting screw bolt, an end face seal ring, a press plate, an outer housing, a shaft sleeve, a cover plate, a radial seal ring, a hollow central spindle, etc. The elastic material internally generates a shear action due to the relative movement between the shaft sleeve and the central spindle as well as between the shaft sleeve and the outer housing, so that the energy of mechanical vibration is converted into the shearing deformation energy of the viscoelastic material. The viscoelastic mechanical material is sealed in a sealed cavity, so that the quality loss or the gas discharge of the viscoelastic material can be avoided in the vacuum, and the obvious decrease of the damp performance and the possible pollution to the other optical equipment caused by the quality loss or the gas discharge can be avoided. The damper has the advantages of being simple in structural composition, reliable in sealing, free from space pollution, long in service life, wide in application range, convenient to install and operate, etc.

Description

technical field [0001] The invention relates to a sealed viscoelastic damper suitable for on-orbit vibration reduction of spacecraft. Background technique [0002] With the development of spacecraft technology, the spacecraft has more and more functions, and it carries more and more sophisticated payloads. These payloads are often very sensitive to the vibration environment of the spacecraft in orbit. The vibration source on the spacecraft is generally an important equipment, which cannot be removed directly, or it is very difficult to change its vibration characteristics. Therefore, in order to meet the environmental requirements of the payload, it is necessary to use a corresponding damper to absorb the vibration energy transmitted from the vibration source to the payload through the spacecraft structure. A commonly used method is to directly attach viscoelastic materials to the parts of the spacecraft that vibrate greatly. Although this method is effective, the viscoelas...

AI Technical Summary

Problems solved by technology

A commonly used method is to directly attach viscoelastic materials to the parts of the spacecraft that vibrate greatly. Although this method is effective, the viscoelastic materials will produce outgassing in space, which will pollute the optical payload. this method generally cannot be used in the vicinity of optical payloads

In addition, this method often directly exposes the viscoelastic material to the outside. Under the irradiation of sunlight, its damping performance will accelerate attenuation, and its life will be greatly shortened.

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