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

ON ORBIT DEPLOYMENT OF THE EU:CROPIS SOLAR PANEL BY GFRP TAPE SPRING HINGES

Mierheim, Olaf and Glaser, Thilo and Orlowski-Feldhusen, Fabian and Kottmeier, Sebastian and Hühne, Christian (2021) ON ORBIT DEPLOYMENT OF THE EU:CROPIS SOLAR PANEL BY GFRP TAPE SPRING HINGES. ECSSMET, 23.-25. März 2021, Braunschweig.

[img] PDF
1MB

Abstract

Eu:CROPIS is a compact satellite featuring a biological payload. The Satellite was launched on December 3rd 2018. The cylindrical Satellite of 1m diameter has four deployable panels for power generation. Those panels are connected to the main structure by glass fibre reinforced polymer (GFRP) tape spring hinges. The hinges, comparable to curved metallic measuring tapes, have elastic energy stored when flattened and folded and thus deploy the panels by simply unfolding. When unfolded the hinges snap into their original shape and support the panels with considerable stiffness. No friction or mechanical locking is involved in the deploying process. The presented paper focuses on the practical handling of the hinges and the mechanisms during the final integration and the deployment process. The integration of the panels requires some special consideration. The hinges are not able to support the panels under gravity. The release mechanisms only work at a correct positioning of the panels. The measures taken to ensure the integrity and functionality of the hinges and mechanisms are described and examples are given for a correct and a false outcome. The separation is done by breaking a bolt with a heated bushing from shape memory alloy. Though reliable the separation cannot be timed down to the second and there is no direct feedback of the separation. To prevent an uneven opening of the panels several on orbit pre-tests are performed to ensure the functionality of the mechanisms for the actual deployment. At the actual separation the heating is monitored to ensure that all mechanisms are activated and the separation is working as proposed. Furthermore, a method was developed to detect the successful breaking of the bolts by use of the heating temperature data. The paper describes these checks and surveillance methods. As not all things go as planned some decisions were to be made before and at panel deployment. Also, the unfolding of the hinges was slower than during the on ground. Tests were made to simulate and understand the on-orbit behaviour. Lessons learned for further use of the mechanisms are presented.

Item URL in elib:https://elib.dlr.de/141551/
Document Type:Conference or Workshop Item (Speech)
Title:ON ORBIT DEPLOYMENT OF THE EU:CROPIS SOLAR PANEL BY GFRP TAPE SPRING HINGES
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mierheim, OlafOlaf.Mierheim (at) dlr.deUNSPECIFIED
Glaser, ThiloThilo.Glaser (at) dlr.deUNSPECIFIED
Orlowski-Feldhusen, Fabianfabian.orlowski (at) dlr.deUNSPECIFIED
Kottmeier, SebastianSebastian.Kottmeier (at) dlr.dehttps://orcid.org/0000-0001-8129-1644
Hühne, ChristianChristian.Huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Date:23 March 2021
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Accepted
Keywords:Deployment, Panel, Hinge, Tape Spring Hinge, In�Flight-Demonstration
Event Title:ECSSMET
Event Location:Braunschweig
Event Type:international Conference
Event Dates:23.-25. März 2021
Organizer:DLR
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Compact Satellites FO V
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Institute of Space Systems > Systems Engineering and Project Office
Deposited By: Mierheim, Olaf
Deposited On:30 Mar 2021 12:15
Last Modified:30 Mar 2021 12:15

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.