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Shape control of thin shell reflectors for future space telescopes

par Bastaits, Renaud ;Rodrigues, Gonçalo;Jetteur, Philippe;Preumont, André
Référence ESA SP, 691 SP
Publication Publié, 2012

Article révisé par les pairs

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Résumé :

This paper examines the morphing capability of doubly curved elastic shells with various layers of active materials with strain actuation capability. Two lay-ups are considered: unimorph (single layer of active material) and twin-bimorph (two pairs of symmetrical layers of active material with orthotropic properties). Numerical simulations indicate that the optical modes with shapes where the curvatures in orthogonal directions have opposite signs are fairly easy to control and substantial amplitudes may be achieved. However, the optical modes with shapes where the curvatures in orthogonal directions have the same sign are difficult to control with the unimorph configuration. A much better morphing is achieved with a twin-bimorph configuration.