Version 5.0 of the Integrated Modeling of Optical Systems (IMOS) software has been released. A previous version was described in "Software for Multidisciplinary Analysis of Optical Systems" (NPO-20536), NASA Tech Briefs, Vol. 24, No. 11 (November 2000), page 36. In both versions, IMOS is a MATLAB™ computer program that provides many functions for analysis of a system represented by mathematical models of its thermal, structural, control, and/or optical aspects. IMOS is unique in making it possible to perform the entire multidisciplinary analysis in one program. The new features incorporated into version 5.0 include a capability for calculating stresses in rods and beams, a utility subprogram that generates equivalent properties of laminates, a three-dimensional-viewing subprogram, a provision for temperature-dependent heat input for thermal analyses, a provision for a simulated stiffness for the drilling degree of freedom of a plate structural element, a provision for a lumped-mass formulation for a beam, a capability to orient properties of materials with respect to plate structural elements, plate-to-acoustic and beam-to-acoustic connections for statistical energy analysis, geometric stiffnesses for plate elements (for buckling analysis), subprograms for translation from the SINDA program to IMOS and from IMOS to the NASTRAN program, and greatly improved subprograms for translation from IMOS to SINDA and from NASTRAN to IMOS.
This program was written by Laura Needels, Hugh C. Briggs, Daniel Eldred, Robert Glaser, Andrew Kissil, Marie Levine, James Melody, Mark Milman, Robert Norton, Miltiadis Papalexandris, Terry Scharton, Samuel Sirlin, Tricia Sur, Wan Tsoi, and Walter Tsuha of Caltech for NASA's Jet Propulsion Laboratory. For further information, access the Technical Support Package (TSP) free on-line at www.nasatech.com/tsp under the Physical Sciences category.
This software is available for commercial licensing. Please contact Don Hart of the California Institute of Technology at (818) 393-3425. Refer to NPO-20849.
This Brief includes a Technical Support Package (TSP).
Updated Multidisciplinary Optical-System-Analysis Software
(reference NPO-20849) is currently available for download from the TSP library.
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Overview
The document provides an overview of the Integrated Modeling for Optical Systems (IMOS) software, specifically highlighting the features and capabilities of its latest version, 5.0. IMOS is a MATLAB™-based program designed for multidisciplinary analysis of optical systems, integrating thermal, structural, control, and optical models into a single environment. This integration allows for end-to-end analysis, enabling users to simulate complex interactions, such as how solar heating affects structural deformation, which in turn can misalign optics and degrade instrument performance.
One of the key advantages of IMOS is its ability to perform comprehensive analyses without the need for multiple separate software programs, which is the common practice in the industry. This unified approach facilitates optimization based on multi-disciplinary criteria, such as minimizing energy encirclement for optical instruments and ensuring that critical values, like temperature at specific nodes, are accurately represented.
Version 5.0 introduces several new features, including the capability to calculate stresses in rods and beams, a utility for generating equivalent properties of laminates, and a three-dimensional viewing subprogram. It also includes provisions for temperature-dependent heat inputs, simulated stiffness for drilling degrees of freedom in structural elements, and lumped-mass formulations for beams. Additionally, the software supports plate-to-acoustic and beam-to-acoustic connections for statistical energy analysis, geometric stiffnesses for buckling analysis, and improved translation subprograms for interfacing with other software like SINDA and NASTRAN.
The development of IMOS involved a collaborative effort from a team of researchers at Caltech for NASA’s Jet Propulsion Laboratory, emphasizing its robust foundation in scientific research and engineering. The software is available for commercial licensing, with contact information provided for interested parties.
Overall, IMOS represents a significant advancement in the field of optical system analysis, offering a comprehensive tool for engineers and scientists to optimize designs and improve performance through integrated modeling. The document underscores the importance of such tools in enhancing the efficiency and accuracy of analyses in complex optical systems.
