Computer Science – Performance
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984dcsl.rept.....s&link_type=abstract
Final Technical Report Draper (Charles Stark) Lab., Inc., Cambridge, MA.
Computer Science
Performance
Infrared Telescopes, Large Deployable Reflector, Large Space Structures, Mathematical Models, Reflectors, Simulation, Spaceborne Telescopes, Airborne/Spaceborne Computers, Computer Programs, Equations Of Motion, Focal Plane Devices, Performance Prediction, Photons, Ray Tracing, Reflecting Telescopes, Signal Processing, Structural Analysis, Thermal Analysis, Transfer Functions
Scientific paper
Simulation tools for the large deployable reflector (LDR) are discussed. These tools are often the transfer function variety equations. However, transfer functions are inadequate to represent time-varying systems for multiple control systems with overlapping bandwidths characterized by multi-input, multi-output features. Frequency domain approaches are the useful design tools, but a full-up simulation is needed. Because of the need for a dedicated computer for high frequency multi degree of freedom components encountered, non-real time smulation is preferred. Large numerical analysis software programs are useful only to receive inputs and provide output to the next block, and should be kept out of the direct loop of simulation. The following blocks make up the simulation. The thermal model block is a classical heat transfer program. It is a non-steady state program. The quasistatic block deals with problems associated with rigid body control of reflector segments. The steady state block assembles data into equations of motion and dynamics. A differential raytrace is obtained to establish a change in wave aberrations. The observation scene is described. The focal plane module converts the photon intensity impinging on it into electron streams or into permanent film records.
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