University of Twente Student Theses


Design of a flexure-based tip-tilt-piston mechanism with high support stiffness

Schilder, W. P. (2019) Design of a flexure-based tip-tilt-piston mechanism with high support stiffness.

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Abstract:Flexure based Tip-Tilt-Piston (TTP) mechanisms are often found in optical applications like micro mirror arrays or large fast steering mirrors. In this paper the design of a new TTP mechanism with a high support stiffness over a translational stroke of $\pm$ 4 mm and a rotational stroke of $\pm$ 0.04 rad is presented. Parametric models of multiple concepts with various levels of complexity are generated. By means of optimization a necessary support stiffness is enforced while the actuation stiffness is minimized. During shape optimization penalty constraints are applied to the parasitic eigenfrequencies, occurring stress and support stiffness drop. Analytic and flexible multi-body modelling approaches are used for efficient function evaluations in the optimization algorithm. Additional efficiency is gained by exploiting symmetry in the concepts and choosing an optimal test trajectory. For validation of the results, finite element analyses are conducted. This resulted in a design with an eigenfrequency of 31 Hz corresponding to tip-tilt motion and 15 Hz for piston motion. The first parasitic eigenfrequency corresponding to support stiffness is found at 734 Hz for a payload of 1 kg.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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