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Marco Riva – Thesis Proposal - Optomechanical design: integrated models and Structural Optimization |
The design of astronomical instrument is growing in dimension and
complexity following ELT class telescopes. The availability of new structural
material like
composite ones is asking for more robust and reliable designing numerical
tools. This thesis wants to push on the activity started at Osservatorio
Astronomico di
Brera regarding optomechanical design by upgrading the in house developed
integrated design framework.
The procedure starts from the developing of a raw structure consisting in
an assembly of plates and beams directly from the optical design. The basic
Finite Element
Model is then prepared joining together plate and beam elements for the
structure and mass and semi-rigid element for the the
opto-mechanical subsystems. The
technique developed is based onto Matlab;
commands and run the FEA, extrapolate the optical displacements, implement them
into the optical design and evaluates
the image quality in terms of displacement and spot size. Thanks to a simplified procedure the routine is able to
derive the full field of displacements from a reduced
sequence of three different load sets. The automatic optimization routine
modifies the properties of plates and
beams considering also different materials and, in
case of composites different lamination sequences. The algorithm is
oriented to find the best compromise in terms of overall weights w.r.t. eigen-frequencies, image
stability and quality.
FEM + Raytracing integrated framework design
Example of Telescope Integrated Structural
Optimization
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Last modified: 06/11/2008