elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

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

Melz, T. and Sachau, D. and Melcher, J. and 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, pp. 67-72. ESA Publications Division. ESA Symposium on Spacecrafts, Braunschweig, Oktober 1998. ISBN 92-9092-712-7.

Full text not available from this repository.

Abstract

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.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999, monograph_id=SM98-019/124,
Title:Active Reduction of Cryocooler Induced Vibration Using Smart Materials And Adaptive Controls
Authors:
AuthorsInstitution or Email of Authors
Melz, T.UNSPECIFIED
Sachau, D.UNSPECIFIED
Melcher, J.UNSPECIFIED
Breitbach, E.UNSPECIFIED
Date:1999
Journal or Publication Title:Proceedings European Conference on Spacecraft Structures, Material and Mechanical
Volume:SP 428
Page Range:pp. 67-72
Editors:
EditorsEmail
European Space Agency, UNSPECIFIED
Publisher:ESA Publications Division
ISBN:92-9092-712-7
Status:Published
Event Title:ESA Symposium on Spacecrafts, Braunschweig, Oktober 1998
Organizer:ESA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Institut für Strukturmechanik
Deposited By: Sibylle Wolff
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 15:33

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.