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Active Reduction of Cryocooler Induced Vibration Using Smart Materials And Adaptive Controls

Melz, T. und Sachau, D. und Melcher, J. und Breitbach, E. (1999) Active Reduction of Cryocooler Induced Vibration Using Smart Materials And Adaptive Controls. In: Proceedings European Conference on Spacecraft Structures, Material and Mechanical, SP 428, Seiten 67-72. ESA Publications Division. ESA Symposium on Spacecrafts, Braunschweig, Oktober 1998. ISBN 92-9092-712-7.

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Kurzfassung

At DLR Berlin – Adlershof Research Center, the BIRD (BERLIN INFRARED DETECTOR) satellite is currently being designed, fabricated and tested for launch in late 1999. This small satellite is planned to weight about 80 kg. and measure about 500 mm on each side before the deployment of antennas and solar panels. As the primary payload, the satellite will be carrying two infrared detectors for the purpose of earth observation. The cameras will be independently mounted but observing the same field of view with a slight overlap. Due to the severe weight and volume restrictions, it is planned to use cryocoolers to ensure the necessary operating temperatures for the infrared sensors. The initially selected cryocoolers model induces significant uniaxial vibration into the satellite due to a moving piston arm and an additional pumping action. The coupling of the oscillating cooling arm to the sensor head brings the danger that the sensors’ orientation will not be fixed to the desired accuracy which would result in potential reductions of the quality of the scientific results. Due to volume constraints the standard approach of employing a cryostat cannot be applied, nor is it suitable to mount the cryocoolers back to back since each cryocooler is used separately for the individual infrared sensor. In the present paper an adaptive solution to counteract induced forces and resulting vibrations at the sensors’ heads with respect to the operational boundary conditions in space will be discussed. For this, an adaptive microvibration control system based on piezoceramic actuators and sensors is presented. Adaptive signal processing is used for the adjustment of the actuator driving signals. Digital transversal filter types combined with recursive adaptation algorithms allow self-optimizing controllers. The design of a demonstration structure and the performance of adequate experiments will be described.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=1999, monograph_id=SM98-019/124,
Titel:Active Reduction of Cryocooler Induced Vibration Using Smart Materials And Adaptive Controls
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Melz, T.NICHT SPEZIFIZIERT
Sachau, D.NICHT SPEZIFIZIERT
Melcher, J.NICHT SPEZIFIZIERT
Breitbach, E.NICHT SPEZIFIZIERT
Datum:1999
Erschienen in:Proceedings European Conference on Spacecraft Structures, Material and Mechanical
Band:SP 428
Seitenbereich:Seiten 67-72
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
European Space Agency, NICHT SPEZIFIZIERT
Verlag:ESA Publications Division
ISBN:92-9092-712-7
Status:veröffentlicht
Veranstaltungstitel:ESA Symposium on Spacecrafts, Braunschweig, Oktober 1998
Veranstalter :ESA
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W RP - Raumtransport
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Institut für Strukturmechanik
Hinterlegt von: Sibylle Wolff
Hinterlegt am:16 Sep 2005
Letzte Änderung:14 Jan 2010 15:33

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