NDLI: Upgrades and Modifications of the NASA Ames HFFAF Ballistic Range

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Upgrades and Modifications of the NASA Ames HFFAF Ballistic Range

Content Provider	Semantic Scholar
Author	Bogdanoff, David W. Wilder, Michael C. Cornelison, Charles J. Perez, Alfredo J.
Copyright Year	2017
Abstract	Recent developments at the NASA Ames Hypervelocity Free Flight Aerodynamic Facility (HFFAF) ballistic range are described, including the conversion of the shadowgraph stations from film-based cameras to digital cameras. The various configurations of the shadowgraph stations are presented, and resolution tests of film and two types of digital camera are described. Digital camera resolution of ~4000 x 4000 pixels nearly achieves film resolution. The advantages of the digital cameras are discussed, including the immediate availability of the shadowgraphs. Tests have been conducted to assess the applicability of a commercially-available model detection system. A new gunpowder, St. Marks Powder WC 886, was assessed for the NASA Ames 6.25”/1.50” light gas gun to replace the traditionally-used Hercules HC-33-FS powder, which is no longer available. The results from eight proof shots for the two powders are presented. Both muzzle velocities and piston velocities are 5 – 9% lower for the new St. Marks WC 886 powder than for the old Hercules HC-33-FS powder. Computed piston and muzzle velocities are in good agreement with experiment. Finally, shadowgraph-reading software that employs template-matching pattern recognition to locate the ballistic-range model is described. Templates are generated from a 3D solid model of the ballistic-range model. The accuracy of the approach is assessed using a set of computer-generated test images.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20170011587.pdf
Alternate Webpage(s)	https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20180001561.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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