10, August 2015

ESA Open Invitation To Tender AO8359
Open Date: 05/08/2015
Closing Date: 15/10/2015

Status: ISSUED
Reference Nr.: 15.133.04
Prog. Ref.: GSTP Period 5 Elem 1
Budget Ref.: E/0904-051 – GSTP Period 5 Elem 1
Special Prov.: DE+GB
Tender Type: C
Price Range: 200-500 KEURO
Establishment: ESTEC
Directorate: Directorate of Technical & Quality Manag
Department: Mechanical Engineering Department
Division: Structure and Mechanisms Division
Contract Officer: Pratesi, Giulia
Last Update Date: 05/08/2015
Update Reason: Tender issue

Microvibration is becoming a critical issue to more and more ESA missions (e.g. Sentinel2, MTG¦). The Reaction Wheels required for the attitude control for these missions are also one of the key micro-vibration sources. This activity is intended to investigate and assess all of the contributors to reaction wheel microvibrations, to characterise these by test, determine their likely variability due to launch and environmental conditions and to seek for ways both to reduce their contribution and to provide a likely in orbit vibration spectra with a high degree of confidence. From the test results, a model of the disturbance spectra will be produced and delivered. Such an activity will prove highly useful to a number of current and future ESA missions and will also be of great benefit to reaction wheel providers to assist in the improvement of their wheels.

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