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  • 1
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    Creation of Anatomically Accurate Computer-Aided Design (CAD) Solid Models from Medical Images (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Most surgical instrumentation and implants used in the world today are designed with sophisticated Computer-Aided Design (CAD)/Computer-Aided Manufacturing (CAM) software. This software automates the mechanical development of a product from its conceptual design through manufacturing. CAD software also provides a means of manipulating solid models prior to Finite Element Modeling (FEM). Few surgical products are designed in conjunction with accurate CAD models of human anatomy because of the difficulty with which these models are created. We have developed a novel technique that creates anatomically accurate, patient specific CAD solids from medical images in a matter of minutes.
    Keywords: Computer Programming and Software
    Type: 1999 American Association of Neurological Surgeons Annual Meeting; Apr 24, 1999 - Apr 29, 1999; New Orleans, LA; United States
    Format: text
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  • 2
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    Statistical Emulator for Expensive Classification Simulators (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Expensive simulators prevent any kind of meaningful analysis to be performed on the phenomena they model. To get around this problem the concept of using a statistical emulator as a surrogate representation of the simulator was introduced in the 1980's. Presently, simulators have become more and more complex and as a result running a single example on these simulators is very expensive and can take days to weeks or even months. Many new techniques have been introduced, termed criteria, which sequentially select the next best (most informative to the emulator) point that should be run on the simulator. These criteria methods allow for the creation of an emulator with only a small number of simulator runs. We follow and extend this framework to expensive classification simulators.
    Keywords: Computer Programming and Software
    Type: NASA/TM-2016-219174 , L-20675 , NF1676L-23725
    Format: application/pdf
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  • 3
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    Multidisciplinary Tool for Systems Analysis of Planetary Entry, Descent, and Landing (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Systems analysis of a planetary entry (SAPE), descent, and landing (EDL) is a multidisciplinary activity in nature. SAPE improves the performance of the systems analysis team by automating and streamlining the process, and this improvement can reduce the errors that stem from manual data transfer among discipline experts. SAPE is a multidisciplinary tool for systems analysis of planetary EDL for Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Titan. It performs EDL systems analysis for any planet, operates cross-platform (i.e., Windows, Mac, and Linux operating systems), uses existing software components and open-source software to avoid software licensing issues, performs low-fidelity systems analysis in one hour on a computer that is comparable to an average laptop, and keeps discipline experts in the analysis loop. SAPE uses Python, a platform-independent, open-source language, for integration and for the user interface. Development has relied heavily on the object-oriented programming capabilities that are available in Python. Modules are provided to interface with commercial and government off-the-shelf software components (e.g., thermal protection systems and finite-element analysis). SAPE currently includes the following analysis modules: geometry, trajectory, aerodynamics, aerothermal, thermal protection system, and interface for structural sizing.
    Keywords: Man/System Technology and Life Support
    Type: LAR-17821-1 , NASA Tech Briefs, September 2011; 44
    Format: application/pdf
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  • 4
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    More About the Tetrahedral Unstructured Software System (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: TetrUSS is a comprehensive suite of computational fluid dynamics (CFD) programs that won the Software of the Year award in 1996 and has found increasing use in government, academia, and industry for solving realistic flow problems (especially in aerodynamics and aeroelastics of aircraft having complex shapes). TetrUSS includes not only programs for solving basic equations of flow but also programs that afford capabilities for efficient generation and utilization of computational grids and for graphical representation of computed flows (see figure). The 2004 version of the Tetrahedral Unstructured Software System (TetrUSS), which is one of two software systems reported in "NASA s 2004 Software of the Year," NASA Tech Briefs, Vol. 28, No. 10 (October 2004), page 18, has been improved greatly since 1996. These improvements include (1) capabilities to simulate viscous flow by solving the Navier-Stokes equations on unstructured grids, (2) portability to personal computers from diverse manufacturers, (3) advanced models of turbulence, (4) a parallel-processing version of one of the unstructured-grid Navier-Stokes-equation-solving programs, and (5) advanced programs for generating unstructured grids.
    Keywords: Man/System Technology and Life Support
    Type: LAR-16882-1 , NASA Tech Briefs, September 2006; 28
    Format: application/pdf
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  • 5
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    A Multidisciplinary Tool for Systems Analysis of Planetary Entry, Descent, and Landing (SAPE) (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: SAPE is a Python-based multidisciplinary analysis tool for systems analysis of planetary entry, descent, and landing (EDL) for Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Titan. The purpose of SAPE is to provide a variable-fidelity capability for conceptual and preliminary analysis within the same framework. SAPE includes the following analysis modules: geometry, trajectory, aerodynamics, aerothermal, thermal protection system, and structural sizing. SAPE uses the Python language-a platform-independent open-source software for integration and for the user interface. The development has relied heavily on the object-oriented programming capabilities that are available in Python. Modules are provided to interface with commercial and government off-the-shelf software components (e.g., thermal protection systems and finite-element analysis). SAPE runs on Microsoft Windows and Apple Mac OS X and has been partially tested on Linux.
    Keywords: Computer Programming and Software
    Type: NASA/TM-2009-215950 , L-19730 , LF99-9217
    Format: application/pdf
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  • 6
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    Application of Quaternions for Mesh (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new three dimensional mesh deformation algorithm, based on quaternion algebra, is introduced. A brief overview of quaternion algebra is provided, along with some preliminary results for two-dimensional structured and unstructured viscous mesh deformation.
    Keywords: Computer Programming and Software
    Type: 8th International Conference on Numerical Grid Generation in Computational Field Simulations; Jun 01, 2002; Honolulu, HI; United States
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  • 7
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    Discrete Data Transfer Technique for Fluid-Structure Interaction (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents a general three-dimensional algorithm for data transfer between dissimilar meshes. The algorithm is suitable for applications of fluid-structure interaction and other high-fidelity multidisciplinary analysis and optimization. Because the algorithm is independent of the mesh topology, we can treat structured and unstructured meshes in the same manner. The algorithm is fast and accurate for transfer of scalar or vector fields between dissimilar surface meshes. The algorithm is also applicable for the integration of a scalar field (e.g., coefficients of pressure) on one mesh and injection of the resulting vectors (e.g., force vectors) onto another mesh. The author has implemented the algorithm in a C++ computer code. This paper contains a complete formulation of the algorithm with a few selected results.
    Keywords: Computer Programming and Software
    Type: AIAA Paper-2007-4309 , 18th AIAA Computational Fluid Dynamics Conference; Jun 25, 2007 - Jun 28, 2007; Miami, FL; United States
    Format: application/pdf
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