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DEPLOYTECH Streszczenie raportu

Project ID: 284474
Źródło dofinansowania: FP7-SPACE
Kraj: United Kingdom

Periodic Report Summary 1 - DEPLOYTECH (Large Deployable Technologies for Space)

Project Context and Objectives:

DEPLOYTECH is a three part project whose primary focus is the increase in Technology Readiness Level (TRL) of promising deployable space technologies. The three technologies concerned are:

• Inflatable structural components for satellites in the micro-nano satellite categories;
• Bistable Reeled Composite (BRC) deployable booms (with special reference to solar array applications) for mid-large sized satellites;
• Closed-section lenticular carbon fibre deployable booms for solar sails.

Project Results:


The work related to InflateSail performed in the first period of DEPLOYTECH includes:

• Extensive review of relevant existing deployable technologies;
• Overall concept and system design;
• Selection and extensive experimental verification of rigidisation technique;
• Thermal analysis of deployed laminate structure;
• Sail and inflatable folding pattern selection;
• Worst-case dynamic loads on system during deployment;
• Sizing and material selection for all components;
• Orbital dynamic simulation for selected geometry;
• Design of inflation system.

Roll-up Solar Array

The project aims to produce a generic and highly scalable design for the deployment of solar arrays – arrays of photo-voltaic cells used to provide electrical power in most mid to large scale satellite designs. This is aimed primarily at using the new generation of flexible solar cells, which offer significant weight and space savings as they consist of thin flexible films that can be coiled for storage but the potential to use the same design to deploy more orthodox rigid solar cells will be explored in principle.

The design uses a pair of bi-stable carbon fibre booms, deployed side by side with the solar cells stretched between them. This bi-stable boom technology, which is proprietary to RolaTube Technology Ltd, is also being used in a somewhat different configuration in the InflateSail project that also forms part of the Deploytech programme.

DLR Booms for GOSSAMER 2

The design of boom (see Figure 12) and boom deployment mechanisms (see Figure 13) of Gossamer-1 has been adapted to the DEPLOYTECH relevant Gossamer-2 size.

The booms will be manufactured from shells of 0.12mm thick 0/90 plain weave CFRP stripes. The CFRP is a 94g/m² material made from T700 fibre and the cyanate ester resin LTM123 matrix from ACG/UMECO with 55% fibre volume content. The specific mass of the booms will be about 60 to 70 gram per meter.

The boom deployment mechanism will be made out of CFRP/Alu-Honeycomb sandwich panels. The functionality will be identical to the Gossamer-1 engineering model (see Figure 14): A metallic belt is co-coiled with the boom on the passively braked hub inside the mechanism. The boom can be deployed in a very controllable manner, by coiling the free end of the belt with a winch mechanism.

Potential Impact:


The Engineering Model (EM) is currently under construction, and will be ready for testing in late September. Qualification will begin in early 2014, and a flight model will be ready for delivery by late 2014.

It is hoped that InflateSail will demonstrate the first successful deployment of an inflatable from a CubeSat, and the first use of a structural inflatable of this kind. The inflatable boom will weigh between 30-60 g per metre, representing a clear advantage as a telescopic deployment system.

Roll-up Solar Array

Final detailed design of the QM will commence in December 2013 and it is anticipated that construction will be completed by May 2014. It is hoped that this work will provide satellite designers with a novel method of providing cost-effective solar arrays that are lighter, more compact and simpler and thus more reliable than the current designs.

DLR Booms for GOSSAMER 2

The adaption of the concepts to Gossamer-2 dimensions is mainly finished. Currently, the efforts are focussed on the finalisation of the detailed design of the engineering model.

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