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Innovative Visco-Elastic Dampers for Shock & Vibration Control by Tony DEMERVILLE

Discover the potential of viscoelastic materials in shock and vibration management with insights from Tony DEMERVILLE. Explore the use of visco-elastic dampers in space environments to protect payloads during launch and landing phases. Learn about the unique properties of viscoelastic materials and their role in controlling dynamic problems. Join SMAC on a journey of innovation and engineering excellence in dampers design for various applications.

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Innovative Visco-Elastic Dampers for Shock & Vibration Control by Tony DEMERVILLE

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  1. Innovative Visco Elastic Dampers for Shock and Vibration Control Tony DEMERVILLE (SMAC, tony,demerville@smac.fr) www.smac-sas.comZI Toulon-Est BP 119 83079 Toulon Cedex 9 France

  2. What about viscoelasticmaterials? Polymermaterialswithvarious additives (Vulcanizing agents, reinforcing charges, protecting agents,…) Viscoelasticmaterial = Thermosetmaterial Various possibility to tune the material regarding the requirements, and the environnementconditions,as the space constraints Outgassing values of SMACTANE 50 SP

  3. Viscoelasticmaterials and mechanicalbehavior Soft materialwith an extremeflexibiliy : Hyper-elacticbehavior Visco-elasticitydefined by a storagemodulus (E’) and a lossmodulus (E’’) Ultimate tests on IMU damper

  4. Viscoelasticmaterials and mechanicalbehavior Effect of the temperature on the moduli : Effectof the frequencyon the moduli : SMACTANE 50 SP and DMA tests

  5. Viscoelasticmaterials and mechanicalbehavior Effectof the strainonthemoduli : Visco-elasticmaterial = Various No linearityeffects but veryinteresting to solvedynamicproblems ! PAYNE EFFECT SMACTANE 50 SP and DMA tests

  6. Viscoelastic damper for SEIS/INSIGHT payload INSIGHT : NASA Discovery Program mission on Mars proposed by JPL withseveraleuropeanpartners Objectives : To improve the scientific knowledge about the planet formation process by measuring the planet “vital signs” View of the SEIS Payload

  7. Viscoelastic damper for SEIS/INSIGHT payload Launch phase & Landing phase : Random + Shocks About the Shockevents : Usuallaunchshocks, Activation of lock actuators , deployment of seismometer,…. The payloadcan not survive to thismechanicalenvironment !!! SMAC isselected to design a visco-elastic damper to protect the SEIS payload

  8. Design of the dampers : Review of the specification Mass of the suspendedpayload : 8,0Kg Localisation of the dampers : Alignedwith the suspendedCoG Mechanicalrandomlevels : 7,16 grms Shockenvironment profile : 2200g from 2kHz up to 10kHz

  9. Design of the dampers : Review of the specification Temperature range, Random : -20°C / +45°C Temperature range, Shockevents : -50°C / +35°C (Mars landing) -60°C / +60°C (Release events) Random and Attenuationrequirements : ShockAttenuationrequirements :

  10. Design of the damper, choice of the visco-elasticmaterial Visco-elasticmaterial : Verylow Glass Temperature (Tg) to becompliantwith the requiredattenuation up to -60°C ! The SMAC rubberref MB1176-01 (FS-7286-02) wascompounded ) Spaceenvironmentconstraints (outgassing, radiation, ageing) : OK

  11. Design of the damper, stiffnessassessment and rubbershape Stiffnessassessmentcoupledwithallowable volume : A conicalrubbershapeischoosen : The Axial/Radial stiffness ratio isdriven by Dext, H, t and α Staticstiffness : Analyses by FEMs (HyperelasticNeo-Hooke behaviorlaw) Dext H t α

  12. Design of the damper, stiffnessassessment and rubbershape The nominal rubber design (Mock-up type A) isdefined by analyses : Short schedule and no-lineareffects of rubber : 2 back-up rubber design (Mock-up tye B and type C) are defined (and manufactured) !

  13. Design of the damper, QMs & FMs View of the QMs/FMs design: Externalmetallichousing : Titanium (Ta6V)

  14. Final configuration, QMs & FMs Evolution of the input data : Following X&Y axis (IP), the CoGis not centeredregarding the location of the 3 dampers ! There is a major risk not to get the attenuation rate due to the rocking modes ! Solution : To increase the stiffness of the damper located close to the CoG by adjusting the rubbercompund (MB1176-01=>MB1183-01) « Soft damper » « New » positioning of CoG « Soft damper » « Hard damper »

  15. Random qualification tests, QMs & FMs Random qualification tests : -20°C, +20°C & +45°C (ADETESTS Lab) Mechanicalstrenght : OK (lowevolution of the FFT under sine lowlevel) :

  16. Random qualification tests, QMs & FMs Attenuationunderrandomlevels : OK for the 3 axis from -20°C up to +45°C Y axis, -20°C Z axis, -20°C

  17. Shock tests: Suspended vs No-Suspendedpayload Shock tests based on a dummy mass and Frangibolt activation (CNES pyrolab) A soft damper isreplaced by a « rigiddamper » Soft Damper Rigid Damper

  18. Shock tests: Suspended vs No-Suspendedpayload Main results in rigid configuration :

  19. Shock tests: Suspended vs No-Suspendedpayload Main results in soft configuration :

  20. Pyroshocktestingunderextreme qualification temperatures At -52°C : Z axis (OOP)

  21. Pyroshocktestingunderextreme qualification temperatures At -52°C X axis (IP) Y axis (IP)

  22. CONCLUSIONS Visco-elasticmaterialcanbetunedregardingSpaceOperationalConditions (temperature, outgassing, radiations,…) Used as shock and vibration control thanks to damper, isolatorntuned mass damper, structural damping,…. New way : Earth observation satellite and decoupling of spinningactuaorswhichcaneffect the quality of pictures !

  23. Thank you for your attention SMAC Company

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