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Title: Six Degrees of Freedom (6DOF) Simulations of Supersonic Fragment Trajectories.

Abstract

In this report a process using existing technologies at Sandia National Laboratories (SNL) to simulate the six degrees-of-freedom (6DOF) trajectories of explosive fragments is described and tested. First, aerodynamic forces and moments as functions of orientation are computed using the SIERRA/Aero supersonic ow solver. The forces and moments are normalized and tabulated in a database. Second, this the aerodynamic coefcient database is imported into a 6DOF rigid body dynamics solver in order to compute the resulting trajectories. The supersonic ow simulations are tested for simple geometries and show good agreement with literature values. The simulation procedure is then demonstrated for an example fragment. The results of the example fragment indicate that the distance traveled in the early ight (from 2.5 km/s until decreasing down to 1 km/s) varies widely depending on the initial orientations. The fragment trajectory distribution and steady tumbling rate is explored. The study indicates that a 6DOF analysis will yield information about a spread of possible trajectories, while using an average drag coefcient can only represent the most likely trajectory.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1597202
Report Number(s):
SAND2020-0759
683328
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Yeh, Peter Derek. Six Degrees of Freedom (6DOF) Simulations of Supersonic Fragment Trajectories.. United States: N. p., 2020. Web. doi:10.2172/1597202.
Yeh, Peter Derek. Six Degrees of Freedom (6DOF) Simulations of Supersonic Fragment Trajectories.. United States. doi:10.2172/1597202.
Yeh, Peter Derek. Wed . "Six Degrees of Freedom (6DOF) Simulations of Supersonic Fragment Trajectories.". United States. doi:10.2172/1597202. https://www.osti.gov/servlets/purl/1597202.
@article{osti_1597202,
title = {Six Degrees of Freedom (6DOF) Simulations of Supersonic Fragment Trajectories.},
author = {Yeh, Peter Derek},
abstractNote = {In this report a process using existing technologies at Sandia National Laboratories (SNL) to simulate the six degrees-of-freedom (6DOF) trajectories of explosive fragments is described and tested. First, aerodynamic forces and moments as functions of orientation are computed using the SIERRA/Aero supersonic ow solver. The forces and moments are normalized and tabulated in a database. Second, this the aerodynamic coefcient database is imported into a 6DOF rigid body dynamics solver in order to compute the resulting trajectories. The supersonic ow simulations are tested for simple geometries and show good agreement with literature values. The simulation procedure is then demonstrated for an example fragment. The results of the example fragment indicate that the distance traveled in the early ight (from 2.5 km/s until decreasing down to 1 km/s) varies widely depending on the initial orientations. The fragment trajectory distribution and steady tumbling rate is explored. The study indicates that a 6DOF analysis will yield information about a spread of possible trajectories, while using an average drag coefcient can only represent the most likely trajectory.},
doi = {10.2172/1597202},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {1}
}