University of Twente Student Theses


Design of a flexible hollow hinge for a cryogenic environment

Klomp, E.J. (2021) Design of a flexible hollow hinge for a cryogenic environment.

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Abstract:Flexure hinges are a common solutions for smooth and accurate control of a movement. In this research, a hollow flexure hinge is designed for the rotation of a triple mirror system for an instrument of the European Larges Telescope (ELT). The study aims to maximizing the deflection of a one degree of freedom system, while maintaining high second and higher term natural frequencies (vibration modes). The flexures are developed using the Freedom and Constraint Topologies (FACT) theory, and optimized with multibody software Spacar. Multiple concepts have been developed of which three were selected for detailed analysis. During the development of the concepts, the use of tapered flexures is analyzed with the use of Finite Element Method (FEM) software Ansys Workbench. The study showed that even though the geometry of flexure hinges can rotate at a large angle, the vibration modes and stress still limit the maximum rotation angle. With the use of tapered flexures foreshortening (shorting) issues can be prevented and stress can be reduced. The optimizations show that the three leaf spring torsion model can be rotated by an angle of seven degrees around the zaxis while fulfilling all the other requirements. Additional study will be needed in order to enlarge the maximum rotation angle.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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