Multivariable Isoperformance Methodology for Precision Opto-Mechanical Systems

O.L. de Weck and D.W. Miller (USA)


Isoperformance, Multidisciplinary Design Optimization, Contouring, Opto-Mechanical Systems


Precision opto-mechanical systems, such as space tele scopes, combine structures, optics and controls in order to meet stringent line-of-sight (LOS) pointing and wavefront error (WFE) phasing requirements. In this context a novel approach to the design of complex, multi-disciplinary sys tems is presented in the form of a multivariable isoperfor mance methodology. The performance outputs are treated as equality constraints and the non-uniqueness of the design space is exploited by trading key system parameters with respect to each other. The goal is to find a performance in variant set of design options, I. Three algorithms (branch-and-bound, tangential front following and vector spline approximation) are developed for the bivariate and multivariable isoperformance problem. An experimental validation is carried out on the DOLCE laboratory testbed and it is shown that the predicted perfor mance contours match the experimental data well at low ex citation levels. This paper focuses on the algorithms used to find I, rather than the systems engineering implications. The isoperformance approach enhances the understanding of complex multi-disciplinary systems by exploiting perfor mance information beyond the local neighborhood of a par ticular point design.

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