| Analysis of Multilayer Dielectric Waveguide Structures, |
FEB 1983 |
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| Authors:
J. M. Zavada; S. T. Peng; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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 | Multilayer dielectric structures are analyzed to determine the optical waveguiding properties of the surface and leaky waves that can be supported by such structures. Each layer in these structures is assumed to have a uniform dielectric constant that may include an absorption term. Any finite number of layers can be treated by this analysis. The method of transmission line theory is appliedto this problem in order to keep the formulation ... |
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| Discrete-Time Disturbance Accommodating Control of a Helicopter Gun-Turret System, |
OCT 1982 |
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| Authors:
N. P. Coleman; R. Johnson; E. Carroll; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| The design and implementation of a microprocessor-based disturbance accommodating controller for the XM-97 helicopter gun-turret control system is considered. A two-state observer is used to estimate and suppress recoil induced torque disturbances associated with weapon firing. Both nonfiring and firing test results are presented. (Author) |
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| IR Algorithm Development for Fire and Forget Projectiles |
18 JUN 1982 |
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| Authors:
Vincent P. Marchese; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| ARRADCOM has under contract, on the Advanced Indirect Fire System (AIFS) Program, several contractors who are attempting to solve the problem of autonomous detection of military targets, primarily armored vehicles. The contractors are prepared to analyse data from the background as well as targets in their seeker's field of view to develop algorithms designed to distinguish the targets from the background. Several of the sensing approaches collect and analyse reflected ... |
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| Microbial Attack of Nitrocellulose |
18 JUN 1982 |
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| Authors:
Bruce W. Brodman; Michael P. Devine; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| The present study is directed toward the use of microorganisms to remove energetic nitrate ester groups from the surface of propellant grains in order to obtain the requisite control of the propellant burning rate. In summary, it has been shown that Aspergillus fumigatus can utilize nitrogen from pyroxylin suspended in a nitrogen deficient medium if a supplementary carbon source is provided. It appears that the organism does not directly attack ... |
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| The Shock Front Rise Time in Water |
18 JUN 1982 |
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| Authors:
Paul Harris; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| This paper reports on successful shock front optical reflectivity theory and experiment for water at 5.8 kbar (0.58 GPa), and complimentary shock induced electrical polarization experiment and theory for the pressure range 20 kbar to 100 kbar. The LCWSL - Universite de Poitiers program has experiments performed in France (funded by the Commission Nationale Recherche Scientique), while the ILIR program within the LCWSL funds the theoretical work. The consistent interpretation ... |
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| Measurement of Residual Stresses in Ammunition |
82 |
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| Authors:
F. Witt; F. Lee; W. Rider; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| The work on aluminum bases has shown that finite length gage equations produce numerical values for the residual stresses that are 10 to 20 percent lower than those produced by the conventionally used point gage equations; and hole drilling methods with undercut end mills, abrasive jet and trepann ring produce calculated stresses which agree to within 15 percent of each other. The work on steel shell bodies has shown that ... |
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| Evaluation of Titanium Prebond Treatments by Stress Durability Testing |
82 |
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| Authors:
R. F. Wegman; D. W. Levi; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| Ti-6Al-4V alloy was treated prior to adhesive bonding using nine different surface prebond treatments. The resulting clean surfaces were bonded with four different adhesive systems, two 121 C curing types and two 177 C curing types. The stressed durability tests were conducted in accordance with ASTM-D-2919 at 60 C and condensing humidity at varying levels of stress. The results indicate that the surface treatments could be generally divided into three ... |
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| Nondestructive Testing of Armament-System Components by Means of Neutron Diffraction, |
JUN 1980 |
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| Authors:
Henry J. Prask; Chang S. Choi; Samuel F. Trevino; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| In recent years, increasing emphasis has been placed on nondestructive testing (NDT) techniques for quality control in a large variety of applications. Progress in this area has considerable importance for DOD because of the increasing complexity and cost of armament systems and the inherent limitations of quality control by means of traditional, destructive test methods. This is dramatically illustrated by the on-going, multi-billion dollar DA plant modernization project within which ... |
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| Non-Linear Chi-Square Algorithm an Improvement on Non-Linear Least Squares, |
JUN 1980 |
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| Authors:
Richard L. Moore; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| Because of the high cost of testing, many large weapon systems cannot be tested over the full range of possible battlefield parameters. As a result, the developer and the reviewing authorities have come to rely on system simulation to demonstrate the system capability over the range of untested parameters. These simulations also are useful to investigate the change in performance resulting from possible subsystem modifications. In some important programs, the ... |
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| Interior Ballistic Modeling for Blank Ammunition, |
JUN 1980 |
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| Authors:
Sidney Goldstein; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| The 1973 Yom Kipper War emphasized that adequate field training was essential for an effective modern mechanized army. There evolved, therefore, the requirement (1) to fire the .50 caliber M2HB and M85 machine guns during training exercises. As a result, blank ammunition for .50 cal weapons is currently being developed as part of the Multiple Integrated Laser Engagement System (MILES) program. This paper describes a computer model which would aid ... |
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| An Adaptive Lead Prediction Algorithm for Maneuvering Target Engagement. |
MAY 1980 |
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| Authors:
Pak T. Yip; Norman P. Coleman; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| This paper describes a multiple model adaptive Kalman Filter approach to the problem of estimating and predicting the position, velocity and acceleration states of tank targets of varying maneuverability. The estimation and prediction problem presupposes that the range and angle DATA (measurements corrupted by Gaussian white noise) is available. The target dynamics is described by a system equation. The solution to this problem is an adaptive algorithm implementable in real ... |
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| Applications of Delay Feedback in Control Systems Design. |
MAY 1980 |
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| Authors:
N .P. Coleman; E. Carroll; D. Lee; K. Lee; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| Necessary and sufficient conditions for exact state reconstruction using delays are discussed together with an example in which the technique is implemented in real time using an 8080/8085 microprocessor. Also, a frequency domain technique for synthesizing certain feedback control laws with delays is developed and several examples discussed. (Author) |
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| Copperhead Semiactive Laser Guidance System Development. |
OCT 1979 |
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| Authors:
Robert A. Nulk; Harold L. Pastrick; Phillip A. Morrison; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| The Effects of Physical and Chemical Processes on Two-Phase Detonations, |
JUN 1978 |
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| Authors:
Pai-Lien Lu; Norman Slagg; Barry Fishburn; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| Systematic studies of the effect of additives and fuel drop size on the detonability of heptane-air mixtures have been carried out under controlled laboratory conditions and in large scale field tests. It was shown in the shock tube studies that n-propyl nitrate and butyl nitrite as well as, to a lesser extent, small drop size can greatly widen the detonation limits and reduce initiation requirements of heptane-air mixtures. Large scale ... |
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| Dynamics of Pin Pallet Runaway Escapement, |
JUN 1978 |
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| Authors:
Gerard G. Lowen; Frederick R. Tepper; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| This paper reports on the development of a simulation of a constant input torque pin pallet runaway escapement. The resulting program provides a basic tool for the analysis and synthesis of various safing and arming devices. The dynamics of the regimes of motion of the escapement were formulated. Coupled motion, with continuous contact between escape wheel tooth face and pallet pin, impact of the pin on the tooth face and ... |
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| METALLURGICAL AND NONDESTRUCTIVE ANALYSIS OF THE 90% W-7% Ni-3% Fe ALLOY KINETIC ENERGY PENETRATOR |
78 |
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| Authors:
J. M. Sakai; C. M. Glass; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| several nondestructive testing techniques were used on a candidate kinetic energy penetrator with the composition w-7ni-3fe. the tests were effective in detecting cracks and voids. uts, yts and pct strain at fracture are given for unswaged and 12 pct swaged specimens. |
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| BALLISTICS TESTS ON HEAT TREATED TUNGSTEN ALLOY PENETRATORS AFTER SWAGING |
78 |
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| Authors:
J. M. Sakai; C. Grabarek; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| two tungsten alloy penetrators were heat treated by gradually heating to 1720 f and quenching. the two treatments varied in the heating rate and the hold time prior to quenching. tys was decreased by both treatments. one treated penetrator was too ductile and the other penetrated the multiple target. |
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| Protective Systems for Cast Magnesium |
78 |
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| Authors:
W. T. Ebihara; A. Gallaccio; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| This paper summarizes findings from several phases of a multifaceted investigation on the assessment of protective systems for three cast magnesium alloys, AZ91C, EZ33A, and ZE41A. Salient information is presented concerning: the inherent corrosion and fatigue characteristics, the influence on corrosion behavior and fatigue endurance of machining (surface), shot peening, resin impregnating, acid pickling, chromating, and organic finishing. Other phases of this investigation nearing completion, and for which results are ... |
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