| A Multidisciplinary Coupled Computational Fluid Dynamics (CFD) and Structural Dynamics (SD) Analysis of a 2.75-in Rocket Launcher |
APR 2002 |
40 pages |
| Authors:
Karen R. Heavy; Jubaraj Sahu; Stephen A. Wilkerson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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 | A multidisciplnary effort was undertaken to investigate the effect of aerodynamic loading on the structural integrity of a multiple launch rocket system of interest to the U.S. Army. Computational fluid dynamics (CFD) techniques have been used to obtain numerical solutions for the flow field of a rocket and launcher. Computed results have been obtained for several launch tubes, with the rocket at separation distances of 20, 33, and 66 in. ... |
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| Optimizing a Slingatron Launcher Using MATLAB |
AUG 2001 |
47 pages |
| Authors:
Mark L. Bundy; Gene R. Cooper; Stephen A. Wilkerson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| A slingatron is the name given to a propellantless mechanical means of launching a projectile. To date, slingatrons are only conceptual in nature, but their potential use as a ground-to-space launch mechanism for umnanned payloads is under investigation. Slingatrons can be configured in a variety of geometries; one form consists of a spiral track (or launch tube) that gyrates at a constant frequency about a set radius. Under proper conditions ... |
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| Comparison Between Simulated and Experimental Results for a Balanced- Breech M256 Cannon System |
SEP 2000 |
26 pages |
| Authors:
Stephen A. Wilkerson; David H. Lyon; Larry Rusch; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| Numerical simulations indicate that a mass-balanced system, with realistic tolerances and boundary conditions, would drastically reduce the motion of the gun tube during the projectile in-bore cycle. It was further postulated that such a system could significantly reduce projectile dispersion, as well as diminish the computer correction factors for different ammunition types. Several simple devices were designed and manufactured to achieve this desired effect on the actual recoil system. Then, ... |
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| Analysis of Bending a Square Ceramic Plate under Strong Rotation |
SEP 2000 |
31 pages |
| Authors:
Gene R. Cooper; Stephen A. Wilkerson; Don Carlucci; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The U.S. Army has a continuing interest in smart weapons systems. Among them are projectiles employing independent logic. Smart weapons use printed circuitry with chips supplying the smarts for the system's autonomic functions. Experience has shown that considerable thought is required to design circuits that remain effective when subjected to severe environmental conditions. Launch conditions can place a projectile's components under axial loads ... |
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| Analysis of a Balanced Breech System for the M1A1 Main Gun System Using Finite Element Techniques |
NOV 94 |
39 pages |
| Authors:
Stephen A. Wilkerson; David A. Hopkins; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| A DYNA3D finite element (FE) analysis was used to help determine the observed behavior of the M256 gun system during the balanced breech experiment. The experiment was conducted to see if balancing the breech block on the M256 would unprove the overall gun system's performance. The experiment, although partially successful, revealed some unsuspected results. The analysis in this report uses an advanced numerical model of the entire M256 system to ... |
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| Boundary Integral Technique for Explosion Bubble Collapse Analysis |
AUG 93 |
49 pages |
| Authors:
Stephen A. Wilkerson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The dynamics of an underwater explosion bubble, including its collapse and interaction with a free or hard surface, are analyzed using incompressible flow theory and a boundary integral formulation. The formulation of the solution method and the crux of the numerical treatment are presented in detail. A computer program for axisymmetrical problems has been successfully developed. Numerical results, including bubble periods, maximum radii, and velocities of the reentrant jet tip, ... |
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| Bubble Dynamics Calculations Using the DYSMAS/E Finite Difference Code |
JUL 88 |
26 pages |
| Authors:
Stephen A. Wilkerson; Hans Schittke; NAVAL SURFACE WARFARE CENTER SILVER SPRING MD
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| A method of calculating underwater bubble collapse using the DYSMAS/E code is presented. The effects on bubble growth and collapse of a nearby rigid boundary and the free surface are included in the analysis. The solution methodology is described, and the advantages and disadvantages of compressible flow theory are compared to incompressible flow theory. The approach is shown to give reasonable results in comparison to observed explosion bubble behavior. This ... |
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| A Method for the Calculation of Abscissas and Weight Factors Using Gaussian Integration for Integrands with a Logarithmic Singularity |
20 NOV 87 |
30 pages |
| Authors:
Stephen A. Wilkerson; NAVAL SURFACE WARFARE CENTER SILVER SPRING MD
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| A method for the calculation of abscissas and weight factors using Gaussian integration for integrands with a logarithmic singularity is presented. The method shows good convergent properties and allows for the accurate estimation of the error. A program is supplied for the generation of orthogonal polynomials with weight Log(x) to order n, and numerical tables for the Gaussian integration method are provided. Keywords: Abscissas, Gaussian integration, Orthogonal polynomials.(JHD) |
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