Simulation Model of an Adaptive Control System for a Segmented Deformable Mirror in a Space Telescope and its Metrological Certification

Authors: Sychev V.V., Klem A.I. Published: 29.03.2021
Published in issue: #1(134)/2021  
DOI: 10.18698/0236-3933-2021-1-14-32

Category: Instrument Engineering, Metrology, Information-Measuring Instruments and Systems | Chapter: Metrology and Measurement Assurance  
Keywords: adaptive control system, permanent magnet synchronous machine, simulation model, metrological certification, error of inadequacy

The paper concerns a measurement problem of identifying inadequacy in a mathematical model of an adaptive control system driving segments of a deformable mirror in a large telescope. This is necessary to assess the validity of this model. A dual-axis servo drive unit utilising permanent magnet synchronous machines controls the mirror segments. The servo unit rotates each segment of the deformable mirror with respect to its axis of symmetry and tilts each segment relative to the fixed central reference segment. The paper provides general descriptions of the model structure and the feedback in the current control loop employing phase current measurement and coordinate transformations. We present initial data sets for metrological certification of the model. We used the MMK-stat M software to perform the metrological certification so that we could check empirical equations, determine the scope of application for the model and validate it. The metrological certification allowed us to confirm that the model of an adaptive control system for a segmented deformable telescope mirror is valid, and to find the model structure that ensures a more accurate description of the measurement problem that concerns controlling the spatial position of the object simulated


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