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Multilayer adaptive thin shell reflectors for future space telescopes

Units : Department of control engineering and system analysis | ULB809

Description :

The project proposes a concept of piezoelectric adaptive thin shell reflector for future space telescopes; it exhibits excellent
areal density and stowability, and thus, paves the way to future large aperture space telescopes. Controlling the surface figure of
spherical or parabolic shell with in-plane stresses induced by a piezoelectric layer raises two problems: 
(1) Doubly curved
shells are significantly stiffer than flat plates and 
(2) When using segmented electrodes with different voltages, the surface figure
is subject to edge fluctuations. 
This results in a very large number of electrodes, leading to ill-conditioning in the Jacobian
matrix of the system; to solve this, a hierarchical approach is proposed to inverse the Jacobian, based on Saint-Venant’s
principle. This research also provides a petal configuration design which aims at reducing the hoop stiffness and improving the
foldability of the reflector.

List of persons in charge :

  • KINNAERT Michel

  • WANG Kainan

Members List :

  • WANG Kainan

List of lessors :

  • Autres ressources extérieures