30, March 2018

ESA Open Invitation to Tender AO9307
Open Date: 26/03/2018
Closing Date: 14/05/2018 13:00:00

Status: ISSUED
Reference Nr.: 18.133.01
Prog. Ref.: Technology Developme
Budget Ref.: E/0901-01 – Technology Developme
Tender Type: C
Price Range: 200-500 KEURO
Products: Satellites & Probes / Mechanisms / Mechanisms / Other
Techology Domains: Space System Control / Control Systems Innovative Technologies / High Accuracy Pointing Technologies / Space System Control / Control Systems Innovative Technologies / Competitive AOCS Technologies / Mechanisms / Mechanism Core Technologies / Dampers & Speed Regulator Technologies
Establishment: ESTEC
Directorate: Directorate of Tech, Eng. & Quality
Department: Mechanical Engineering Department
Division: Structure and Mechanisms Division
Contract Officer: Strzelecki, Patryk Michal
Industrial Policy Measure: N/A – Not apply
Last Update Date: 26/03/2018
Update Reason: Modified the Statement of Work (English version)

Typical isolation systems currently used are limited to passive isolators, based on viscoelastic elements. Other passive existing technologies include eddy-current dampers, the so-called D-struts and shunted piezo electric transducers. Active systems include voicecoil and piezo actuators and active eddy current dampers. This proposal is prompted by recent developments in the frame of TEC Technology Assessment supported work on electromagnetic shunt dampers connected to a negative resistance circuit showing promising performances. However, multiple promising competing technologies are under development in Europe and the TDA is open to all technologies fulfilling the following criteria: – Limited amplification of system resonances (~3dB) – 20 dB attenuation @ 20Hz, 50-60dB attenuation @ 100Hz, 80-90dB attenuation @ 200Hz . (Best existing systems provide 40dB @ 100Hz, but have not been flown.) – Low/predictable temperature dependence of isolation performance – Low complexity/ high reliability – Low mass, 25-75% of mass of isolated equipment -Low power consumption – Magnetically clean – Tuneable/scalable (to avoid complete system redesign as is currently the case for passive isolators) This activity aims to take the newest technologies demonstrated in the laboratory or via analysis and develop a full scale breadboard for one application (e.g. reaction wheel isolation). A typical configuration for these isolation systems is in the form of a hexapod, using 6 struts. The following tasks will be performed: – Selection of the application (e.g. reaction wheels, cryocoolers, payload isolation) – Design of a full-scale breadboard – Modelling and simulation/analysis of isolation system performance- Functional validation at strut level – Functional validation at hexapod level, including assessment of tunability

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