PhD position (3 years): Design and Optimization of Laboratory Model Robotic Arm End-Effector for In-Orbit Contact Capacitor Discharge Stud (CCDS) Welding on Conductive and Non-Conductive Spacecraft Surfaces

Bratislava, Bratislavský kraj
Dočasný pracovný pomer
Plný úväzok

Pred 15 dňami

Offer DescriptionAs we venture deeper into the era of space exploration and the density of human-made objects in orbit increases, the imperative for a circular economy in space becomes ever more critical. This thesis is focused on the advancement of a technology that is pivotal for enabling sustainable operations in orbit: the design and optimization of a robotic arm end-effector for Contact Capacitor Discharge Stud (CCDS) Welding. This innovative end-effector is not only designed for welding conductive and non-conductive surfaces common to spacecraft but also introduces a versatile capability for manipulating space debris and creating universal interfaces for material joining. By equipping space missions with the ability to weld studs onto structures, this technology opens new avenues for repurposing debris and constructing modular assemblies in space. Such capabilities are essential for the establishment of a circular economy beyond Earth, where the principles of reuse, recycling, and resource optimization are critical for minimising space debris and reducing the reliance on Earth-based resources. This research aims to enhance our ability to perform in-orbit construction and repair, thereby contributing to the development of sustainable space infrastructure that supports the long-term presence and exploration of humanity in outer space. The research is supported by cooperation within the European Space Agency (ESA)Objectives: * Conceptualize Electromechanical Design of End-Effector: Develop a versatile end-effector design that accommodates the welding of both conductive and non-conductive spacecraft surfaces, emphasising adaptability, precision, and compatibility with space robotics.

Prototyping of the End-Effector: Construct a laboratory prototype that embodies the conceptual design, using materials and components resilient to space conditions, including extreme temperature fluctuations and vacuum.
Analyze Mechanical and Thermal Behavior of the End-Effector by Simulations: Leverage simulation tools for in-depth analysis of the end-effector's performance, focusing on stress distribution, thermal management, and the interaction with different spacecraft surface materials.
Testing of the End-Effector Behavior: Implement exhaustive testing to evaluate the welding quality on various spacecraft surfaces in vacuum, ensuring compliance with ISO 14555 standards.
Achieve High-Quality Joints on Varied Spacecraft Surfaces: Through careful design, testing, and optimization, ensure that the end-effector can produce welds that meet or exceed the quality requirements across a diverse range of conductive and non-conductive surfaces encountered in spacecraft.
Metallographic and Metallurgical Analysis of Weld Joints: Conduct comprehensive analyses using advanced microscopy techniques to assess the microstructure, phase composition, and integrity of weld joints, providing insights into the quality and durability of the welds.
Mechanical Testing of Weld Joints: Perform mechanical testing, including tensile, shear, and fatigue tests, to evaluate the strength and reliability of welds produced by the end-effector on different spacecraft materials.

Methodology:● Incorporate a mixed-methods approach, combining design and engineering practices with material science and metallurgical analysis.● Utilise CAD and FEA for the design and simulation phases, followed by additive manufacturing and precision machining for prototyping.● Apply advanced microscopy, such as SEM (Scanning Electron Microscopy) and EDS (Energy Dispersive Spectroscopy), for metallographic analysis.● Conduct mechanical tests in compliance with relevant standards to assess joint performance.Expected Outcomes:● A versatile end-effector prototype capable of welding conductive and non-conductive spacecraft surfaces with high precision in vacuum conditions.● Comprehensive data on the mechanical and thermal behaviour of the end-effector, validated through simulations and laboratory tests.● Detailed metallographic and metallurgical reports on the quality of weld joints, highlighting compliance with ISO 14555 standards.● A repository of mechanical test results demonstrating the strength and durability of welds across various spacecraft materials.Significance: This research aims to significantly enhance in-orbit manipulation, construction, repair, and recycling capabilities, directly contributing to the feasibility and success of prolonged space missions and circular space economy. By ensuring the end-effector's ability to achieve high-quality welds on a wide range of spacecraft surfaces, this work lays the foundation for the future recycling depots and construction of resilient and reliable space structures, facilitating the ambitious goals of human exploration and habitation in outer space.RequirementsResearch Field Engineering » Materials engineering Education Level Master Degree or equivalentResearch Field Engineering » Mechanical engineering Education Level Master Degree or equivalentSkills/Qualifications- Previous experience in material engineering, metallurgy, analysis and characterization methods,- Active knowledge of the English language,- Ability to work in a dynamic team and independence are required.Specific RequirementsPlease, send your CV (incl. the list of publications, citations, and conferences is existing), the motivation letter, and 2 reference letters.Send it to Dr. Naďa Beronská, .Languages ENGLISH Level ExcellentAdditional InformationBenefits- a competitive scholarship- working in the young international dynamic team- SAS dormitory lodging at a low monthly wage - involved in the project- travelling, conferences, collaborative basisEligibility criteria- Master degree or equivalent.- Ability to work independently, collaborate with member of team and other teams- English literacySelection processThe applications will be considered individually and based on the sent documents the promising applicants. Candidates will be invited for the internal preselection. The online interview of candidates will take place in May - June 2024. The candidates will be informed about the selection results before June 30th, 2024. The preselected candidates must pass an admissions interview at the University.Candidates will receive more detailed information upon inquiry.Additional commentsData protection: All application documents sent in connection with this call will be safely stored, used only for the preselection process, and will not be provided to any third party. Personal data will be kept for six months and then will be erased.Work Location(s)Number of offers available 1 Company/Institute Institute of Materials and Machine Mechanics, SAS Country Slovakia City Bratislava Postal Code 84513 Street Dubravska cesta 9 GeofieldWhere to apply E-mailnada.beronska@savba.skContact CityBratislava WebsiteStreetDúbravská cesta Postal Code845 13 E-Mailnada.beronska@savba.skmarek.gebura@savba.skSTATUS: EXPIRED

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