Abstract
Space launchers are submitted to complex vibration environments and this can impact the payload it is carrying. Ensuring the protection of the payload therefore requires the addition of a secondary system. In this paper, a rapid design method for the dimensioning of a friction damper is developed, based on the equivalent energy dissipation with that of a viscous damper. A friction damper is designed and a prototype is built. The friction damper is first characterised alone and it is then mounted inside a scale model of a launcher last stage. The friction damper is adequately modelled by a spring in series with a friction element. The damper prototype proves to efficiently damp the rocket engine vibrations, and the design method used for dimensioning the friction damper gives a good approximation for the optimal sliding force of the damper.
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Abbreviations
- W c :
-
Dissipated energy per cycle in the viscous damper
- W f :
-
Dissipated energy per cycle in the friction damper
- k f :
-
Stiffness of the friction damper
- F g :
-
Sliding force of the friction damper
- p :
-
Pressure in the hydraulic jack of the friction damper prototype
- f :
-
Excitation frequency
- u 0 :
-
Excitation amplitude
- F(t):
-
Temporal signal of the tangential force in the friction damper
- u(t):
-
Temporal signal of the relative displacement across the friction damper
- T :
-
Period of the temporal signals (inverse of f)
- A :
-
Area of the force–displacement (F–u) curve
- A + :
-
Area of the force–displacement curve above F = 0
- A−:
-
Area of the force–displacement curve below F = 0
- F n :
-
Normal force in the friction damper
- F gp :
-
Positive sliding force of the friction damper
- F gn :
-
Negative sliding force of the friction damper
- μ :
-
Friction coefficient of the brake lining
- A trap :
-
Area of the absolute value of the force signal F(t)
- τ :
-
Ratio of sliding time to oscillation period of the friction damper
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Brizard, D., Besset, S., Jézéquel, L. et al. Design and test of a friction damper to reduce engine vibrations on a space launcher. Arch Appl Mech 83, 799–815 (2013). https://doi.org/10.1007/s00419-012-0718-1
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DOI: https://doi.org/10.1007/s00419-012-0718-1