| A Review of Australian and New Zealand Investigations on Aeronautical Fatigue During the Period April 1995 to March 1997 |
JUN 97 |
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| Authors:
Colin Martin; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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 | This document is for presentation to the 25th Conference of the International Committee on Aeronautical Fatigue scheduled to be held in Edinburgh, Scotland on 16th and 17th June 1997. A review is given of the aircraft fatigue research and associated activities which form part of the programs of the Aeronautical and Maritime Research Laboratory, the Civil Aviation Safety Authority, and universities in Australia and the Defense Scientific Establishment and the ... |
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| Implementation of a Unified Constitutive Model into the PAFEC Finite Element Package |
MAY 1997 |
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| Authors:
J. Paul; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| A unified constitutive material model was implemented in to the PAFEC Finite Element Package Level 8.1. The modifications allow the PAFEC Package to perform time dependent plasticity. This includes the calculation of the updated material Jacobian used in the formulation of the global stiffness matrix. Automated time stepping, reduced storage requirements and structural convergence features were also included in the code. A series of test analyses addressing different aspects such ... |
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| Critical Diameter Study of Unconfined Australian Manufactured Composition B, Grades A and B |
APR 97 |
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| Authors:
R. J. Swinton; L. McVay; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| Composition B is a widely used high explosive main charge filling for general purpose bombs. In Australia it is manufactured from either RDX (Grade A or Grade B)/TNT 60/40 with 1% wax, or RDX (Grade B)/TNT 55/45 with 1% wax. In weapon applications computational models require experimental data to determine certain specific output parameters of Composition B to predict air blast and fragmentation scenarios. To this end, the critical diameter, ... |
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| Simulating Human Characteristics for Operational Studies |
APR 97 |
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| Authors:
Ian V. Lloyd; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The effect of errors in models of human response on the outcome of a simulated sequence of events can be significantly large compared to the precision with which physical events are typically modelled. The effects of such errors can accumulate when events are propagated up and down a command and control chain. For a simulation of a system to be realistic, the products of simulated human decisions should be available ... |
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| The Referred Weight Flight Test Technique Applied to First of Class Flight Trials |
APR 97 |
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| Authors:
A. M. Arney; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The referred weight flight test technique has been used by the RAN to establish Ship Helicopter Operating Limits for a number of years. This technique involves keeping the referred weight, defined as aircraft weight divided by density ratio, constant for a given flight test. The validity of using this technique has been questioned within the RAN, specifically with respect to its relevance and application to power and flight control margins. ... |
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| Stress Analysis of a Plate Containing a Round Hole with Combined Cold Expansion and Interference Fitting Under F-111C Representative Loading Conditions |
APR 1997 |
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| Authors:
R. B. Allan; M. Heller; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This investigation has been undertaken as part of a program of work having the aim of determining a suitable fatigue life enhancement option for the non-circular fuel flow vent hole # 13 in the wing pivot fitting of the F-111C aircraft. The stress analysis has been undertaken using two dimensional finite element methods assuming either elastic-perfectly plastic or strain hardening material behaviour models. The effect on critical plate stresses due ... |
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| Experimental Stress Analysis of a Plate Containing an Elongated Hole to Determine Buckling Behaviour under Representative F-111 C Loading Conditions |
MAR 97 |
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| Authors:
Robert B. Allan; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report presents an experimental investigation into the tension and compression behavior of a plate specimen with a angled elongated hole. This specimen type will be used for validation of three life management options on the F-111 wing pivot fitting (DADTA, cold expansion/interference fit plug and stress bridge). Two different brands of strain gauges were used to determine their suitability for use in regions of high plastic strains. The buckling ... |
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| Safety Distance Calculations for Multi-Item Fragmenting Munitions |
MAR 97 |
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| Authors:
D. A. Jones; G. Kemister; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The destruction of unwanted munitions is a continuing activity for Army. The Defense Explosives Safety Manual specifies formulae which prescribe a significantly increased safety distance for a multi-item demolition compared to a single item of similar size. In practice this means that in many situations munitions can only be disposed of singly, which is both costly and time consuming due to the safety procedures required between each blast. This report ... |
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| Virtual Reality Technologies and Systems |
MAR 97 |
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| Authors:
Sabrina Sestito; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The aim of this report is to provide an overview of recent developments in some key virtual reality (VR) technologies and systems. Various definitions of VR will be provided. Current VR hardware (Head Mounted Displays, BOOM devices, Stereo Glasses, Convolvotron, Gloves, Tracking devices) and VR software (computer graphic issues, object representation and toolkits) will be discussed. Current innovative systems will then be presented which will include a discussion of SmartScene, ... |
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| An Investigation into an Alternative Fragment Projector for Insensitive Munitions Qualification |
MAR 97 |
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| Authors:
C. Lam; T. Liersch; D. McQueen; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The report describes numerical modelling and experimental testing aimed at producing an explosively formed projectile (EFP) that approximates to a right cylinder (where L/D = 1) with a velocity of about 2.5 km/s for consideration as an alternative to the 12.7 mm steel cubes used in the Fragmat Insensitive Munition test. A large number of EFP designs were modelled using the PC-DYNA2D computer hydrocode and short listed candidates were fabricated ... |
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| 'Merge' - A Filter for the Fusion of Dual-Frequency Sidescan Sonar Data |
MAR 1997 |
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| Authors:
Roger A. Neill; Stuart D. Anstee; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| A filtering and data fusion technique is described which uses the correlation between the two data streams of a dual-frequency sidescan sonar in order to discriminate against noise and preferentially enhance features of desired relative size. The filter is applied to data collected with a Klein 590 dual-frequency sidescan sonar with the parameters adjusted so as to enhance the display of minelike objects. Experience with the filter shows that it ... |
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| A Monte-Carlo Simulation of Light Propagation in Sea Water |
MAR 1997 |
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| Authors:
Mike Brennan; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The design and implementation of a suite of programs for Monte Carlo simulation of light propagation in turbid media is described. The program has been tailored to simulate the propagation of the green laser in the RAN Laser Airborne Depth Sounder (LADS) through turbid water. The paper describes the Monte Carlo program in detail, particularly how the inherent multiple scattering problem is interpreted for incorporation into a single scattering simulation. ... |
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| Using Evolutionary Acquisition for the Procurement of Complex Systems |
MAR 1997 |
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| Authors:
Derek E. Henderson; Andrew P. Gabb; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report presents the results of a study into the future use of evolutionary acquisition (EA) in the procurement of complex systems for the Australian Defense Organization. It identifies the benefits, penalties and risks of EA projects, analyses the different activities involved, and makes recommendations for project planning, management and development activities. Its objective is to provide both an understanding of the dynamics of evolutionary acquisition projects and guidance for ... |
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| Bibliography of Wind-Wave Data and Publications for the Coastal Regions of Australia |
FEB 97 |
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| Authors:
L. J. Hamilton; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| Operational sites providing near real-time wind-wave and swell measurements are listed for the coastal waters of Australia, as at February 1996. A representative listing of historical data sites is also provided, with a comprehensive bibliography of papers and reports on wave investigations. An introduction to wave conditions around Australia is included. Real-time high resolution digital data are available from moored wave-rider buoys, mostly non- directional, and from fixed platforms used ... |
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| Memory Design for Electrically Addressed Spatial Light Modulators |
FEB 97 |
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| Authors:
Robert S. Caprari; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report examines the provision of a high performance memory system for an electrically addressed spatial light modulator (SLM), destined for use in an optical correlator. Two distinct fast memory system designs are proposed. One design is advanced to the stage of specification of major elements of its architecture and timing signals. The other design is developed to the conceptual stage. Appendices review recent high performance semiconductor memory technology. ... |
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| Elastic-Plastic Analysis of a Plate of Strain Hardening Material with a Central Circular Hole - Comparison of Experiment with Finite Element Analysis Containing the Unified Constitutive Material Model |
FEB 97 |
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| Authors:
Robert B. Allan; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report presents an experimental validation of elastic-plastic finite element stress analysis, using a unified constitutive model to describe the plastic response. The validation was done by experimentally measuring the elastic-plastic strain distribution around a circular hole in a flat plate under tensile loading and comparing it with that produced by a finite element analysis of the specimen using the unified constitutive model. The validation involved strain measurements using both ... |
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| Signal Processing Methods for Gearbox Fault Detection |
FEB 97 |
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| Authors:
Simon Rofe; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| Methods of accounting for load variation in vibration signals from helicopter transmission systems are presented. These methods are based on autoregressive moving-average (ARMA) models, and several ARMA parameter estimation schemes are presented. Simulations of load variation are carried out, and a prediction error filter, based on the ARMA models, is used to generate a residual signal. Fault indices extracted from the residential signal are used to indicate the presence or ... |
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| Effect of the Leading-Edge Extension (LEX) Fence on the Vortex Structure over the F/A-18 |
FEB 97 |
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| Authors:
D. H. Thompson; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The effects of the Leading Edge Extension (LEX) fence on the vortex structure over the F/A-18 at moderate to high angles of attack were studied using a 1/9 scale wind tunnel model and a 1/48 scale water tunnel model. Measurements at the tip of one of the vertical fins of the wind tunnel model confirmed that the fence reduced fin vibration caused by vortex breakdown. Flow visualisation in the water ... |
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| Atmospheric Corrosivity of Defence Bases in Northern and Eastern Australia |
FEB 97 |
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| Authors:
B. S. Smith; E. J. Duxbury; B. T. Moore; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| A series of exposure trials has been conducted to characterise the corrosivity of the atmosphere at 16 Defence bases in Eastern and Northern Australia. Atmospheric corrosivity was assessed by measuring the corrosion rates of specimens of steel, zinc and two high strength aluminum alloys when exposed on racks in the open air for periods of one to four years during the period 1988 to 1993. The results are presented in ... |
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| Effectiveness of High Modulus Interference-Fit Bushes for Fatigue Life Extension of Plates with Circular Holes |
FEB 97 |
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| Authors:
Rebecca Evans; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| An experimental program has been carried out to examine the influence of bush modulus on the fatigue lives of aluminum alloy specimens with bushed holes of 12 mm diameter. The specimens, with 1 mm or 2 mm thick bushes of 0.5% interference fit and of widely different modulus, were fatigue tested under a representative fighter aircraft loading sequence. The thin-walled bushes were found to extend the fatigue lives of the ... |
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| A Markov Model for HF Channel Availability in Central Australia |
FEB 97 |
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| Authors:
D. J. Percival; M. Kraetzl; M. Britton; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| In this report, the extensive database of HF spectral surveillance and background noise measurements, recorded at Alice Springs in Central Australia as part of the Jindalee over-the-horizon radar project, is used to develop a model for HF channel availability. Parameters in a two dimensional cyclostationary Markov model are estimated for representative months of Jindalee data. The resulting model may he used for short-term forecasting of HF channel availability for radar ... |
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| The Distributed Interactive C3I Effectiveness (DICE) Simulation |
FEB 97 |
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| Authors:
Mike Davies; Carsten Gabrisch; John M. Dunn; Fred D. Bowden; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| Information Technology Division was tasked by the Headquarters Australian Defence Force to develop tools, through modelling and simulation, for effectiveness studies of Command, Control, Communication and Intelligence (C3I) systems. Such tools needed to allow for the study of systems at the strategic, operational and tactical levels, including all services and joint forces. The primary tool developed is the Distributed Interactive C3I Effectiveness (DICE) simulation in which human players are complemented ... |
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| A Programmer's Reference to the Suppressor Simulation System |
FEB 1997 |
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| Authors:
Robert Whitehurst; Jane Phipps; Victor Kowalenko; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This is a comprehensive reference to the Suppressor Simulation System, a powerful and flexible computer code which allows models of integrated military operations to be put into an Australian context. Such mission level models are vital ingredients to models of entire military campaigns. |
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| A Guide to Using Suppressor in Studies of Large Scale Air Operations |
FEB 1997 |
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| Authors:
Robert Whitehurst; Jane Phipps; Victor Kowalenko; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This guide is an introduction and reference to the Suppressor Simulation System, a powerful and flexible computer code which allows models of integrated military operations to be put into an Australian context. Such mission level models are vital ingredients to models of entire military campaigns. This guide describes in detail how such models are constructed using Suppressor and also provides a comprehensive reference to the Suppressor command language to assist ... |
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| Evaluation of a Laboratory Automatic Target Recognition system: Air-to- Sea Image Sequence |
FEB 1997 |
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| Authors:
Paul Miller; Peter Virgo; Mike Royce; Steve Angeli; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The operation and evaluation of a laboratory automatic target recognition (ATR) system is described. The ATR system was evaluated against its ability to acquire and track a specific target in the presence of false targets and background clutter. A ten second air-to-sea image sequence that contained the infrared signatures of three ship targets and sea clutter was used as the test sequence. The evaluation involved assessing the system performance with ... |
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| Australian Airborne Trials of the Sikorsky S-70B-2 Helicopter: Part 1 - Performance Measurements |
JAN 97 |
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| Authors:
A. M. Arney; I. Fieldhouse; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| Airborne tests have been conducted using an instrumented Sikorsky S- 7OB-2 helicopter. These tests were flown by a Royal Australian Navy Test Pilot and were primarily aimed at establishing limits for the S-7OB-2 when operating from an Adelaide' class FFG-7 frigate. While the aircraft was instrumented, the opportunity was taken to fly a series of performance and flight dynamic tests to establish baseline data that will be used to further ... |
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| Finite Element Analysis of an F-111 Lower Wing Skin Fatigue Crack Repair |
JAN 97 |
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| Authors:
R. J. Callinan; S. Sanderson; D. Keeley; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| In this report a three dimensional finite element (F. E.) model has been developed for a structural detail in an F-111 lower wing skin. The location of interest is a fuel flow groove in the lower wing skin where cracking had occurred in service on aircraft A8-145. Detailed models were developed for (1) un-cracked structure; (2) he cracked structure and (3) the repaired structure, using bonded composite patch for the ... |
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| Visits by Nuclear Powered Warships to australian Ports: Report on Radiation Monitoring During 1996 |
97 |
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| Authors:
DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| Nine visits were made by seven Nuclear Powered Warships (NPW) of the United States Navy to Australian ports in 1996. The Commonwealth Government requires that a radiation monitoring program be carried out in association with such visits to detect any release of radioactivity to the ports or their environments or any increase in external radiation levels above those due to natural background radiation. This report presents a summary of the ... |
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| A Database Compiler for Flight Dynamic Applications |
DEC 96 |
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| Authors:
S. D. Hill; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report describes a database system developed by the Air Operations Division (AOD) for aircraft flight dynamic models. A new database format has been established to meet AOD's flight dynamic and performance requirements. A program has been written to create program source code to read and interpolate/extrapolate data stored in the database format. The major advantage of the new database format is that all the information required to read and ... |
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| Geometric and Radiometric Image Warping due to Displacement of Wide Field Optical Systems |
DEC 96 |
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| Authors:
Robert S. Caprari; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report investigates a problem that arises in the precise registration of images viewed from a moving wide field imaging sensor, such as an airborne missile threat warner. It analyses the geometry and radiometry of image formation by idealised but otherwise arbitrary, imaging optics, thereby determining the image plane irradiance distribution. The analysis extends to determining the transformation of the irradiance (i.e. image warping) due to arbitrary displacement of the ... |
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| The Kinetics and Thermochemistry of the Thermal Decomposition of the Initiating Explosive, Tetrazene, near its Ignition Temperature (between 385 K and 400 K) |
DEC 96 |
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| Authors:
Daniel J. Whelan; Mark R. Fitzgerald; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| The efficient explosive pick-up of the AMRL gasless cap composition based on boron / Pb3O4 / tetrazene and of many in-service stab and percussion- sensitive compositions based on primary explosive lead salts mixed with tetrazene arises from the explosive behaviour of tetrazene and its functioning as an energetic sensitizer. Using the thermoanalytical techniques of differential scanning calorimetry and thermogravimetry, it was established that tetrazene decomposes in a series of steps, ... |
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| Petri Nets And their Application to Command And Control Systems |
DEC 96 |
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| Authors:
Fred D. Bowden; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| Petri nets are directed graphs which were designed to model discrete event systems with concurrence and resource sharing. This makes them a useful method of graphically representing command and control systems. In this document Petri nets and some of their extensions are explained in detail. Coloured Petri nets, an extension of Petri nets, with timed transitions are used to model a command and control system. |
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| Underwater Acoustic Imaging Innovation Program |
DEC 96 |
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| Authors:
Ian S. Jones; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This paper discusses a number of issues in the innovation process being undertaken to solve the problem of producing high resolution images in turbid waters. Strategies to increase the success of the attempted innovation are discussed as well as an estimate of the costs involved. This document reflects the situation as of June, 1996. |
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| An Explanation and Analysis Capability for Extended Petri Nets |
DEC 96 |
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| Authors:
Mike Davies; Fred D. Bowden; John M. Dunn; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| Extended Petri nets (EPN) have been adopted to help establish a number of capabilities for the study of military Command, Control, Communication and Intelligence (C3I). Regardless of the specific application, an EPN explanation and analysis capability is very important. This is particularly true where EPN have been used to describe artificial representations of real-world C3I entities. Some explanation and analysis capability is needed so that the underlying assumptions and characteristics ... |
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| The SPRing Approach to Software Costing |
DEC 96 |
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| Authors:
Gina Kingston; Martin Burke; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This paper describes a two-phase approach to Software Costing which has been proposed by the iMAPS Software Costing Research team. The proposed approach consists of obtaining an initial, rough, estimate of the Cost of the system during the first phase. During the second phase the estimate is refined throughout the development of the system as more information becomes available. |
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| Data Link Technology for a Portable Unmanned Aerial Vehicle |
NOV 96 |
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| Authors:
Victor Kowalenko; Jane Phipps; Keith Cameron; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report examines data link requirements for a portable unmanned aerial vehicle. Crucial to the operation of such a data link is the development of suitable computer algorithms that are capable of significantly compressing and reconstructing image data in a timely manner for viewing at a remote station. As a consequence of the near real time requirement, we investigate recent advances in lossy data compression techniques concentrating on transform coding ... |
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| A Guide to Explosives Firing |
NOV 96 |
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| Authors:
Michael G. Wolfson; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This document is a guide to explosives firing using exploding bridgewire (EBW) detonators. It details the special equipment and procedures developed in the Weapons Systems Division, Maribyrnong and currently in use in the Division's firing chambers and at field test sites, and discusses the relative merits of electric detonators and EBW detonators. It serves as a useful guide and reference document to both Firing Officer trainers and trainees. |
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| Spatial Filtering of Sidescan Sonograms to Remove Streaking due to Signal Level Fluctuations |
NOV 96 |
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| Authors:
Stuart Anstee; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| A spatial filtering technique originally devised to filter streaking from geographically-scaled sidescan sonar images is applied successfully to smaller-scale sidescan sonar images generated during mine warfare exercises. Implementation of the algorithm to minimise computation time is discussed and appropriate filter parameter settings are established. Related techniques for image contrast and noise control are also discussed. |
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| Elastic/Plastic Finite Element Analysis of the F-111 Fuel Flow Vent Hole Number 13 |
NOV 96 |
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| Authors:
J. Paul; P. Chapman; A. Searl; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| A detailed plasticity finite element stress analysis is presented for a fatigue critical location, at Fuel Flow Vent Hole #13 (FFVH #13) in the Wing Pivot Fitting of the Royal Australian Air Force's F-111 aircraft. The D6ac material behaviour was represented by a unified constitutive model which is considered to be particularly accurate for modeling plastic deformation through several cycles of non-symmetric loading. The aim of the present work is ... |
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| On the Dynamics of the Bubble Created Upon Detonation of a Limpet Mine |
NOV 96 |
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| Authors:
John P. Best; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| In this report a simple model of the bubble formed by detonating a limpet mine in contact with a plane surface is developed. The key features are the assumption of a hemispherical bubble and the account taken of the outflow of detonation products from the bubble through the hole caused by the detonation. The outflow of the gas is assumed to be one dimensional. The equations describing the time variation ... |
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| F-111C Lower Wing Skin Bonded Composite Repair Substantiation Testing |
NOV 96 |
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| Authors:
R. Boykett; K. Walker; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| Experimental testing was undertaken to verify a bonded composite repair to a crack in the primary structure of a F-111C aircraft of the Royal Australian Air Force. The flight safety was compromised by a crack in the lower wing skin reducing the structure residual strength below the Design Limit level. Two levels of representative specimens were designed to incorporate the complex local geometry in the lower wing skin. They were ... |
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| The Static Testing of a Lockheed P-3 Orion Wing Leading Edge Centre Section |
NOV 96 |
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| Authors:
Albert K. Wong; Glenn Luke; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report documents the design of the test rig and the results of the static test of the Lockheed P-3 Orion Wing Leading Edge centre section structure. The test comprised of two parts, viz., the validation of the structural integrity of the structure under design load conditions, and the determination of the static strength of the structure for the local transonic flight regime within which the RAAF Orion A9-754 had ... |
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| A Lightweight Vibration Monitoring System for the S-70A-9 Black Hawk Transmission |
NOV 96 |
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| Authors:
D. M. Blunt; S. A. Dutton; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| A lightweight carry-on/carry-off transmission vibration monitoring system has been developed for the Black Hawk helicopter. The system collects vibration data from accelerometers mounted on the transmission while in flight, and then post-processes the data on the ground using AMRL-developed fault detection algorithms. This report describes the system, its installation and operation, and the results of a flight trial conducted by the RAAF Aircraft Research and Development Unit. |
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| Static and Fatigue Test Loading Development for an F-111 Bonded Composite Repair Substantiation |
NOV 96 |
|
| Authors:
K. Walker; G. Swanton; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| Substantiation of a bonded composite repair to an F-111 lower wing skin required the development of representative loads for specimen testing. This report describes the development of representative static and fatigue spectrum loads to be applied during the testing. The spectrum was based on a known representative Wing Pivot Bending Moment spectrum. Full scale static wing testing and the manufacturer's original stress analysis reports were used to convert this spectrum ... |
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| Site Survey For on Ocean Engineering Project West of Perth for July to September 1992 |
NOV 96 |
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| Authors:
Ian S. Jones; D. H. Cato; L. J. Hamilton; B. D. Scott; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| Oceanic environmental surveys were made by DSTO off Perth, Western Australia over July to September 1992 to assess site suitability for an Underwater Radiated Noise Range for the Royal Australian Navy. Acoustic ranges are required to measure the noise radiated from ships and submarines. Salient factors for range design and performance include ambient noise, currents, topography and nature of the seafloor, water properties, wave, wind, and weather conditions. Measurements of ... |
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| Broadband Active Sonar: Implications and Constraints |
OCT 96 |
|
| Authors:
H. Lew; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| The broadband sonar concept has an impact on all areas of an active sonar system. This includes the signal processing of transmit receive signals, the response of the medium and the target response. Beginning with the definition of a broadband signal, the implications of broadband signal processing in terms of matched filtering, pulse compression, low probability of interception and beamforming are examined. This is followed by an investigation of the ... |
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| Environmental Stressors Affecting Human Physiology and Performance in Northern Australia |
OCT 96 |
|
| Authors:
Wai-Man Lau; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| Deployment of military staff to the north exposes them to the debilitating effects of high heat and humidity. This paper summarises the findings of a series of visit to several military establishments in northern Australia and a training battalion in NSW. Areas of research priority were identified and recommendations were given to address ADF's requirements in human physiological performance and survivability in adverse environments. |
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| An Implementation of a Digital Map Overlay on a Tactical Display |
OCT 96 |
|
| Authors:
R. B. Dodd; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| This report describes a digital map implementation developed for overlaying a tactical information display. The digital map implementation operates over widely varying display ranges, with the ability to render both coastal outlines and shaded landforms. The report discusses features of the implementation approach, data preparation and resultant performance. |
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| Strength and Fatigue Life Enhancements of Cracked Metal |
OCT 96 |
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| Authors:
J. M. Finney; C. Neissan; N. Absolom; K. Lemm; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| Measures to reclaim both the static strength and the fatigue life of plates with cracks are examined experimentally on 2024 aluminum alloy specimens. The simple measure of stop drilling the crack tips restored most of the tensile strength of the plate. To enhance the fatigue life of a cracked plate the process of stop drilling the crack tips, cold expanding the resulting holes and inserting interference-fit steel plugs has dramatically ... |
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| Initiation of Detonation in Composition B by an Underwater Shock Wave |
SEP 96 |
|
| Authors:
Michael Chung; Darren McQueen; Lyn McVay; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| This paper examines the interaction of underwater shock waves with bare, cylindrical Composition B acceptor charges. Suitable methods to discern detonation and non-detonation of an underwater charge were determined. Separation distances for the 50% probability of sympathetic detonation of Composition B acceptors using 0.5, 2.5, 5.0 and 10.0 kg spherical pentolite donor charges were calculated from the Bruceton technique. The variation in near field shock wave velocity between donor and ... |
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Reports by Corporate Author
