97 citations · 651 across the 39 of their papers we have counts for
6 papers · 1 filter
Photogrammetry and ballistic analysis of a high-flying projectile in the STS-124 space shuttle launch
Philip T. Metzger, John E. Lane, Robert A. Carilli +2
A method combining photogrammetry with ballistic analysis is demonstrated to identify flying debris in a rocket launch environment. Debris traveling near the STS-124 Space Shuttle…
Hyperstaticity and loops in frictional granular packings
Antoinette Tordesillas, Edward Lam, Philip T. Metzger
The hyperstatic nature of granular packings of perfectly rigid disks is analyzed algebraically and through numerical simulation. The elementary loops of grains emerge as a fundamen…
Electric Potential Due to a System of Conducting Spheres
Philip T. Metzger, John E. Lane
Equations describing the complete series of image charges for a system of conducting spheres are presented. The method of image charges, originally described by J. C. Maxwell in 18…
Spatial and Temporal Extrapolation of Disdrometer Size Distributions Based on a Lagrangian Trajectory Model of Falling Rain
John E. Lane, Takis Kasparis, Philip T. Metzger +1
Methodologies to improve disdrometer processing, loosely based on mathematical techniques common to the field of particle flow and fluid mechanics, are examined and tested. The inc…
Jet-induced cratering of a granular surface with application to lunar spaceports
Philip T. Metzger, Christopher D. Immer, Carly M. Donahue +3
The erosion of lunar soil by rocket exhaust plumes is investigated experimentally. This has identified the diffusion-driven flow in the bulk of the sand as an important but previou…
Craters Formed in Granular Beds by Impinging Jets of Gas
Philip T. Metzger, Robert C. Latta, Jason M. Schuler +1
When a jet of gas impinges vertically on a granular bed and forms a crater, the grains may be moved by several different mechanisms: viscous erosion, diffused gas eruption, bearing…