NASA Technical Reports Server NTRS 20140017687: Projection-Based Reduced Order Modeling for Spacecraft Thermal AnalysisReportar como inadecuado



 NASA Technical Reports Server NTRS 20140017687: Projection-Based Reduced Order Modeling for Spacecraft Thermal Analysis


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This paper presents a mathematically rigorous, subspace projection-based reduced order modeling ROM methodology and an integrated framework to automatically generate reduced order models for spacecraft thermal analysis. Two key steps in the reduced order modeling procedure are described: 1 the acquisition of a full-scale spacecraft model in the ordinary differential equation ODE and differential algebraic equation DAE form to resolve its dynamic thermal behavior; and 2 the ROM to markedly reduce the dimension of the full-scale model. Specifically, proper orthogonal decomposition POD in conjunction with discrete empirical interpolation method DEIM and trajectory piece-wise linear TPWL methods are developed to address the strong nonlinear thermal effects due to coupled conductive and radiative heat transfer in the spacecraft environment. Case studies using NASA-relevant satellite models are undertaken to verify the capability and to assess the computational performance of the ROM technique in terms of speed-up and error relative to the full-scale model. ROM exhibits excellent agreement in spatiotemporal thermal profiles <0.5% relative error in pertinent time scales along with salient computational acceleration up to two orders of magnitude speed-up over the full-scale analysis. These findings establish the feasibility of ROM to perform rational and computationally affordable thermal analysis, develop reliable thermal control strategies for spacecraft, and greatly reduce the development cycle times and costs.



Autor: NASA Technical Reports Server (NTRS)

Fuente: https://archive.org/







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