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Scaling Analysis for Large Membrane Optics

By: Palazotto, A.N.; Cobb, R.G.; Shepherd, M.J.; Baker, W.P.;

2007 / IEEE / 1-4244-0524-6

Description

This item was taken from the IEEE Conference ' Scaling Analysis for Large Membrane Optics ' To meet future requirements, space telescopes are envisioned to require optics tens of meters in diameter. Packaging restrictions of current and foreseeable launch vehicles prohibit the use of a single rigid monolithic mirror of that size. Membrane optics research seeks to create large diameter apertures out of thin flexible film-like reflective material. For our analysis, we examine those structures with embedded in-plane actuated piezo-electric elements for active surface shape control. By analyzing the non-dimensional form of the governing differential equation, relative effects of linear and non-linear terms are apparent. Then, through a series of MSC. Nastran finite element models, scalability issues are explored to include the effects of non-linear terms, existing membrane pre-tension, and unimorph versus bimorph actuation. Results show small-scale (existing) test articles may respond in accordance with linear models, but may mask the nonlinear characteristics which dominate large full-scale membrane optics in the proposed applications.