Spatial Nyquist fidelity method for structural models of opto-mechanical systems

Deborah Howell; Olivier de Weck; David W. Miller

doi:10.1117/12.789111

9 July 2008 Spatial Nyquist fidelity method for structural models of opto-mechanical systems

Deborah Howell, Olivier de Weck, David W. Miller

Proceedings Volume 7017, Modeling, Systems Engineering, and Project Management for Astronomy III; 70171A (2008) https://doi.org/10.1117/12.789111
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

Simulation models of new opto-mechanical systems are often based on engineering experience with older, potentially dissimilar systems. This can result in inaccuracies in the model prediction. A method is needed to gauge the fidelity of new system models in the initial design phases, often in the absence of hardware data. The Nyquist criterion is used to develop a quantitative measure of model fidelity, called the Nyquist fidelity metric. The spatial Nyquist fidelity method is presented which uses the Nyquist fidelity metric to both assess the fidelity of existing complex models and to synthesize new multi-component models starting from architectural considerations such as geometric and material properties of the system. This method also estimates the error bound on the output figures of merit based on the fidelity levels and sensitivity analysis. The Nyquist fidelity method is applied to the Modular Optical Space Telescope (MOST), the Thirty Meter Telescope, and the Stratospheric Observatory for Infrared Astronomy. It is shown in the MOST case study that the Nyquist fidelity method provides a 40% improvement in computational time while assuring less than 5% modal frequency error, and less than 2.2% error in the output figure of merit.

Citation Download Citation

Deborah Howell, Olivier de Weck, and David W. Miller "Spatial Nyquist fidelity method for structural models of opto-mechanical systems", Proc. SPIE 7017, Modeling, Systems Engineering, and Project Management for Astronomy III, 70171A (9 July 2008); https://doi.org/10.1117/12.789111

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