Design and produce machined spectrometer frame, STL-045-21 [STL-003-19], Year 1 of 1
Presentation to be presented during the Site-Directed Research and Development (SDRD) program FY 2021 review meeting (Webex), September 22–23, 2021.
Baldwin, David↗
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Rapid particle generation from an STL file and related issues in the application of material point methods to complex objects
Abstract In this paper, we focus on three issues related to applications of material point methods (MPMs) to objects with complex geometries. They are material point generation, compatibility of material points with a mesh, and sensitivity to mesh orientation. An efficient method of generating material points from a stereolithography (STL) file is introduced. This material point generation method is independent of the mesh used in MPM calculations. The compatibility between the material points and the mesh is then studied. We also show that the original MPM and the dual domain material point (DDMP) method are sensitive to mesh orientation. These issues are related to the calculation of the internal force and are concerns of the MPMs. They become more prominent when MPMs are applied to complex geometries. Our numerical results show that the recently developed local stress difference (LSD) algorithm (Perez et al. in J Comp Phys 498:112681, 2024) can be used to effectively address them.
36 MATERIALS SCIENCE↗
Imaging of Bubble Collapse Effects in Optically Transparent High Explosive as a Method to Study the Detonation Process STL-017-19, Year 2
Imaging of Bubble Collapse Effects in Optically Transparent High Explosive as a Method to Study the Detonation Process STL-017-19, Year 2. Presentation to be given a the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx.
36 MATERIALS SCIENCE↗
Dynamic Sub-Micron Particulate Behavior in Turbulent Media, STL-008-20, Year 1 of 2
Dynamic Sub-Micron Particulate Behavior in Turbulent Media, STL-008-20, Year 1 of 2. Presentation to be given a the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx. There are two videos associated with the presentation, attached.
36 MATERIALS SCIENCE↗
Cognitive Hybrid Radio Waveforms for High-Reliability Secure Wireless Communications, STL-013-19, Year 2
Presentation to be given at the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx. Cognitive Hybrid Radio Waveforms for High-Reliability Secure Wireless Communications, STL-013-19, Year 2
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
High-Energy Neutron Production in a Laser-Generated High-Density Plasma, STL-012-20, Year 1
Presentation to be given at the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx. High-Energy Neutron Production in a Laser-Generated High-Density Plasma, STL-012-20, Year 1
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Millimeter Wave Imaging Diagnostic for High-Explosive Fireball Characterization, STL-011-19, Year 2
Presentation to be given at the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx. Millimeter Wave Imaging Diagnostic for High-Explosive Fireball Characterization, STL-011-19, Year 2
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Laser-Induced Particle Impact Test (LIPIT) and Micro-Pin Investigation of Ejecta/Surface Interactions, STL-025-20, Year 1
Presentation to be given at the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx. Laser-Induced Particle Impact Test (LIPIT) and Micro-Pin Investigation of Ejecta/Surface Interactions, STL-025-20, Year 1
36 MATERIALS SCIENCE↗
Compact Heterodyne Spectrometer for LWIR Detection of Gases from WMD Proliferation Activities, STL-003-19, Year 2
Presentation to be given at the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx. Compact Heterodyne Spectrometer for LWIR Detection of Gases from WMD Proliferation Activities, STL-003-19, Year 2
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Dual Comb Spectroscopy for Definitive Identification of Gas at Speeds Faster than Turbulence Effects, STL-006-19, Year 2
Presentation to be given at the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx. Dual Comb Spectroscopy for Definitive Identification of Gas at Speeds Faster than Turbulence Effects, STL-006-19, Year 2
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
UAS Sensors in Difficult Locations, STL-016-20, Year 1
Presentation to be given at the FY 2020 SDRD Annual Meeting, to be held Sept. 23-24, on WebEx. UAS Sensors in Difficult Locations, STL-016-20, Year 1
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Phenomenology and Node-Level Processing of MASINT Sensor Data across Distributed Sensor Networks STL-016-19, Year 2
This presentation will be presented at the NNSS FY 2020 SDRD Annual (Webex) Meeting scheduled for September 23–24, 2020. Phenomenology and Node-Level Processing of MASINT Sensor Data across Distributed Sensor Networks STL-016-19, Year 2
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
A Spectral Evaluation of the Application of Super-Resolution to Commercial Satellite Imagery, STL-010-18, Year 3
This presentation will be presented at FY 2020 SDRD Annual (Webex) Meeting scheduled for September 23–24, 2020. A Spectral Evaluation of the Application of Super-Resolution to Commercial Satellite Imagery, STL-010-18, Year 3
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Wraparound PDV for Measuring the Impactor Velocity History in High-Hazard Plate Impact Experiments, STL-029-20, Year 1
This presentation will be presented at the NNSS FY 2020 SDRD Annual (Webex) Meeting scheduled for September 23–24, 2020. Wraparound PDV for Measuring the Impactor Velocity History in High-Hazard Plate Impact Experiments, STL-029-20, Year 1
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Material point generation from an STL file
In this short note we describe a method for generating material points from a file in the stere olithography (STL) format commonly used in computer aided design (CAD), 3-D printing, and computer aided manufacturing applications. In this file format the surface of an object is described by triangles in three-dimensional space. The coordinates of the triangle vertexes are provided in the file. In this note we assume that the object of interest is inside of the enclosing set of triangles. Similar methods can also be used to generate material points outside of the enclosing triangles.
42 ENGINEERING↗
Cognitive Hybrid Radio Waveforms for High-Reliability Secure Wireless Communications STL-013-19
Explore the source record for details and available documents.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Radioactive noble gas detection, STL-007-21, Year 1 of 2
Presentation to be presented during the Site-Directed Research and Development (SDRD) program FY 2021 review meeting (Webex), September 22–23, 2021.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Phenomenology and node-level processing of MASINT sensor data across distributed sensor networks, STL-016-19, Year 3 of 3
Presentation to be presented during the Site-Directed Research and Development (SDRD) program FY 2021 review meeting (Webex), September 22–23, 2021.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗