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The liquid oxygen Ø tank
(LOX) is simply supported at its bottom side by
several suspension struts. Four damper struts
(SARO) are connected between the liquid hydrogen
tank (LH2) and the top of the LOX tank. Without
the four damper struts, the thrust oscillations
of the boosters would lead to dynamic response
of the LOX which could bring undesirable effects
on the payloads..
Friction damper
of the ESC-A
of ARIANE V
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Main characteristics of the
SARO damper
Mass: < 4 kg
At room temperature :
- Stroke: ± 30 mm
- Friction force : min.
At cryogenic temp. (-170°C)
during the flight:
- Stroke: from ± 0.05 to ± 0.2
mm
- Axial stiffness > 1E8 N/m
- Frequency range: from 5 Hz to 30 Hz
- Force: ± 2250 N
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New cryogenic upper
stage (ESC-A) of
ARIANE V
The damper strut includes two main parts : a CFRP
strut developed and manufactured by ASTRIUM
Bremen** and a FRICTION DAMPER developed and manufactured
by JARRET
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