Deployables for MicroSats
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
A novel deployable concept for space application has been based on motion structures, referring to deployable structures with internal mechanisms. The work has been concentrated on realizing a Bricard based deployable concept, which is a closed loop mechanism with mobility one. Configuration of de-orbiting sail, antenna or solar array is achieved by accommodating an elastic membrane within the deployable structure. Various mechanisms are traded-off within the scope of space deployables complying with company's requirements. Time varying dynamic behaviour of the chosen mechanism is simulated in MATLAB SimMechanics. Model is simulated both as rigid and flexible to record the resulting torque profile. Structural dynamic response in deployed configuration is simulated in Abaqus to document deployable's natural frequency. Origami inspired folding techniques are explored for the purpose of accommodating the membrane. For deployment, consideration is given to space qualified actuation concepts. Among the examined mechanisms, Alternative form of threefold-symmetric Bricard mechanism turns out to be the most suitable one, with its high stowage efficiency. It is a 6-bar mechanism with mobility one, this property was confirmed by dynamic simulation. Actuating one joint is enough to actuate the whole model. Actuation can be done by electric motor or preloaded spring. The model can accommodate membrane with tree-leaf folding into a cylindrical volume and deploy it into a hexagon. This mechanism could be used to accommodate solar array or sail.
Place, publisher, year, edition, pages
2016. , 115 p.
Technology, Deployable, Microsat, Overconstrained, Bricard, Mechanism
IdentifiersURN: urn:nbn:se:ltu:diva-43625Local ID: 179ad15f-9451-4c52-8a27-889754517aa8OAI: oai:DiVA.org:ltu-43625DiVA: diva2:1016859
Subject / course
Student thesis, at least 30 credits
Space Engineering, master's level
Tom De Vuyst, Dr.Enmark, Anita
Validerat; 20160110 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved