| Development of an Information Fusion System for Engine Diagnostics and Health Management |
FEB 2004 |
22 pages |
| Authors:
Allan J. Volponi; Tom Brotherton; Robert Luppold; Donald L. Simon; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
|
 | Aircraft gas-turbine engine data are available from a variety of sources including on-board sensor measurements, maintenance histories, and component models. An ultimate goal of Propulsion Health Management (PHM) is to maximize the amount of meaningful information that can be extracted from disparate data sources to obtain comprehensive diagnostic and prognostic knowledge regarding the health of the engine. Data Fusion is the integration of data or information from multiple sources, to ... |
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| Distributed Control of Nonlinear Aircraft Structures Including Aerodynamic and Temperature Interactions |
JAN 2004 |
376 pages |
| Authors:
H. S. Tzou; G. E. Blandford; KENTUCKY UNIV LEXINGTON DEPT OF MECHANICAL ENGINEERING
|
| Imposed shape changes and surface control of flexible structures can offer many aerodynamic advantages in flight maneuverability and precision control. Largely deformed shapes and surfaces often involve nonlinear deformations. Studies on the control of nonlinear behavior related to the deformed surfaces and shape changes would provide detailed information for future controlled surface design and implementation. This research is concerned with the controlling nonlinearly deformed structures, e.g., various shells and flexible ... |
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| Access-To-Egress III: Repeated Measurement of Factors that Control the Emergency Evacuation of Passengers Through the Transport Airplane Type-III overwing Exit |
JAN 2004 |
24 pages |
| Authors:
Garnet A. McLean; Cynthia L. Corbett; FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST
|
| Simulated emergency evacuations were conducted from a narrow-body transport airplane simulator through a Type-III overwing exit. The independent variables were passageway configuration, hatch disposal location, subject group size (density), and subject motivation level. Additional variables of interest included individual subject characteristics, i.e., gender, age, waist size, and height, shown in previous studies to significantly affect emergency egress. Subjects were restricted to those who had no previous emergency evacuation (research) history. ... |
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| Navy/Marine Corps TacAir Integration: Providing the MAGTF Increased Capability on a Budget |
Jan 2004 |
46 pages |
| Authors:
Timothy J Frank; MARINE CORPS COMMAND AND STAFF COLL QUANTICO VA
|
| The discussion of Naval/Marine Corps Tactical Aircraft (TacAir) Integration has reached a feverous pitch over the last several months. Emotions run high both for and against the concept. In an effort to achieve greater combat capability, while using the limited resources planned for by the Department of the Navy, it is the Navy/Marine Corps Team's collective goal to streamline its ability to support the Marine Air-to-Ground Task Force (MAGTF) without ... |
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| British Naval Aviation and the Anti-Submarine Campaign, 1917-18 |
2004 |
289 pages |
| Authors:
John J. Abbatiello; KING'S COLLEGE LONDON (UNITED KINGDOM) DEPT OF WAR STUDIES
|
| This thesis investigates the employment of British aircraft against German submarines during the final years of the First World War, an issue that appears only marginally in other studies because it does not clearly fall into naval or air power history. A focused study is needed to assess the effectiveness of the effort and the veracity of the secondary literature. The Royal Naval Air Service invested heavily in aircraft of ... |
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| Study of the Coupling Between Twin Single Beveled Supersonic Jets Using Linear and Non-Linear Spectral Analysis Techniques |
2004 |
93 pages |
| Authors:
G. Raman; D. R. Williams; P. Panickar; K. Srinivasan; ILLINOIS INST OF TECH CHICAGO FLUID DYNAMICS RESEARCH CENTER
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| Twin jets emanating from closely spaced nozzles can interact quite unpredictably and give rise to high dynamic pressures in the internozzle region which can result in sonic fatigue of sensitive aircraft equipment. This project studies the interaction between two such jet from nozzles having a single beveled exit geometry. Such nozzles are finding increasing use in modern aircraft due to the thrust vectoring and performance advantages they present. The study ... |
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| Test and Evaluation Trends and Costs for Aircraft and Guided Weapons |
2004 |
|
| Authors:
Bernard Fox; Michael Boito; John C. Graser; Obaid Younossi; RAND CORP SANTA MONICA CA
|
 | As military systems have become more complex, testing has become more time consuming and costly. A number of efficiencies have been proposed and implemented, such as increasing use of modeling and simulation and combining developmental and operational testing. How have these approaches worked in practice? And do traditional metrics for estimating the cost of testing still apply? This study addressed these issues by examining system-level testing for selected fixed-wing aircraft, ... |
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| Industry Study Paper: The Aircraft Industry, AY 2004, Seminar 2 |
2004 |
41 pages |
| Authors:
Stephen H. Morris; Dominic Archibald; Gerry C. Berg; Edwin McDermott; Carl D. Rehberg; INDUSTRIAL COLL OF THE ARMED FORCES WASHINGTON DC
|
| The aircraft industry now appears to have weathered the "perfect storm" of Severe Acute Respiratory Syndrome (SARS) and the Global War on Terrorism (GWOT), emerging somewhat battered but poised to begin a slow recovery in the coming years. Orders for new aircraft are up and thus revenues and profits should begin to climb in 2005, reversing declining trends since 2001. However, airlines remain under intense pressure to cut costs to ... |
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| That Others May Live: USAF Air Rescue in Korea |
2004 |
60 pages |
| Authors:
Forrest L. Marion; AIR FORCE HISTORICAL STUDIES OFFICE BOLLING AFB DC
|
| When the Korean War began in June 1950, the United States Air Force's Air Rescue Service was a fledgling organization possessing a variety of aircraft types, most having seen service during World War II. The concept of using helicopters and amphibious fixed-wing aircraft to rescue airmen downed behind enemy lines or in hostile waters had gained little consideration by the Air Force and was largely unproven. But by the fall ... |
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| Mechanical Suppression of SCC and Corrosion Fatigue Failures in 300M Steel Landing Gear |
2004 |
11 pages |
| Authors:
Paul Prevey; N. Jayaraman; Neal Ontko; Mike Shepard; Robert Ware; Jack Coate; LAMBDA TECHNOLOGIES CINCINNATI OH
|
| 300M steel is widely used in landing gear because of its ultra high strength with high fracture toughness, but is vulnerable to both corrosion fatigue and stress corrosion cracking, with potentially catastrophic consequences. Plating and shot peening surface treatments currently used to extend life are only partly effective. A surface treatment is needed that will mitigate foreign object damage (FOD), corrosion fatigue and stress corrosion cracking. This paper describes the ... |
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| A Transcription Scheme for Languages Employing the Arabic Script Motivated by Speech Processing Application |
2004 |
8 pages |
| Authors:
Shadi Ganjavi; Panayiotis G. Georgiou; Shrikanth Narayanan; CALIFORNIA UNIV LOS ANGELES DEPT OF LINGUISTICS
|
| Abstract This paper offers a transcription system for Persian, the target language in the Transonics project, a speech-to-speech translation system developed as a part of the DARPA Babylon program (The DARPA Babylon Program; Narayanan, 2003). In this paper, we discuss transcription systems needed for automated spoken language processing applications in Persian that uses the Arabic script for writing. This system can easily be modified for Arabic, Dari, Urdu and any ... |
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| An Early Look at the UML Profile for Schedulability, Performance, and Time for Engineering Large Scale Airborne C2ISR Platforms |
2004 |
5 pages |
| Authors:
Thomas M. Wheeler; MITRE CORP BEDFORD MA
|
| This paper discusses an investigation into the utility of the Object Management Group's UML Profile for Schedulability, Performance, and Time (RT-UML Profile) for engineering a next generation of network centric, large-scale Command, Control, Intelligence, Surveillance, and Reconnaissance (C2ISR) aircraft. This activity applied the Profile in analysis of a multi-aircraft scenario, loosely based on DARPA's AMSTE research program. In this configuration, two aircraft, each with sensing capability, collaborate in real-time to ... |
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| Flow Control Over Swept, Sharp-Edged Wings at Low and Moderate Angles of Attack |
10 DEC 2003 |
28 pages |
| Authors:
Demetri P. Telionis; Pavlos P. Vlachos; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIENCE AND MECHANICS
|
| Active control of fully-separated flow over symmetric sharp-edged wings at high angles of attack is investigated. Experiments were carried out in a low-speed, open circuit wind tunnel, as well as a Mach 0.2, 6'x6' wind tunnel. Angles of attack from 30 to 210 were tested. Low-power input, unsteady excitation was applied to the leading edge of the wings. The actuation was introduced by the periodic oscillation of a 4-percent-chord flap ... |
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| Innovative Manufacturing and Structural Analysis of Composite Isogrid Structures for Space Applications |
DEC 2003 |
92 pages |
| Authors:
Hassan Mahfuz; Derrick Dean; Shaik Jeelani; Mohammed Baseer; Gamaleldin Mohamed; TUSKEGEE UNIV AL
|
| The search for lightweight and highly efficient structural components is a continuing process. Reducing the structural weight and improving the load carrying capabilities of these structures will allow designers to add additional capabilities while reducing cost. The basic functions of aerospace structures are to transmit and sustain the applied loads, provide a basic shape and to protect the payload. Shell stiffened structures have been used for many years to fulfill ... |
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| Cost Benefit Analysis of the Department of the Navy's F-5 Tiger II contract |
DEC 2003 |
135 pages |
| Authors:
Jeffrey C. Brown; Robert K. DeGuzman Jr.; Thomas S. Fulford III; Jesse E. Porter Sr.; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| This project consists of a Cost Benefit Analysis (CBA) of the costs, issues and effects associated with replacing the F-5E/F Tiger II aircraft with F/A- 18A/B. The three alternatives analyzed are (1) continued operation of the F-5E/F, (2) replacement of the F-5 with F/A-18A/B by 2008, and (3) installation of 4th generation pulse-doppler radar in the F-5E/F by 2008. The objective was to compare the three alternatives, choosing the alternative ... |
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| The Costs and Benefits of High Speed Vessels Relative to Traditional C- 17 Military Airlift |
DEC 2003 |
77 pages |
| Authors:
Thomas Strenge; Kevin W. Ralston; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLICPOLICY
|
| This cost-benefit analysis conducted on behalf of MSC compared HSVs against C-17 aircraft, Using financial and operational data garnered from the WestPac Express, as well as third-party research, the researchers investigated the following questions: Is the HSV a better choice for intra-theater lift than AMC7 Should DoD buy or lease? Should the crew be military or civilian? What other theaters require an intra-theater lift platform? How many HSVs does DoD ... |
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| Failure Analysis of an AH-64 Main Rotor Damper Blade Rod End, P/N 7- 211411186-5 |
DEC 2003 |
59 pages |
| Authors:
Scott M. Grendahl; Marc S. Pepi; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The U.S. Army Aviation and Missile Command asked the U.S. Army Research Laboratory's Weapons and Materials Research Directorate to determine the probable cause of cracking of an AH-64 main rotor damper blade rod end, part number 7-211411186-5. The component secures an end of one of the linkages on the helicopter's main rotor. The failure was noted while the helicopter was stationed in Seckenheim, Germany, on 10 June 1998. The investigation ... |
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| A-10s over Kosovo. The Victory of Airpower over a Fielded Army as Told by the Airmen Who Fought in Operation Allied Force |
DEC 2003 |
365 pages |
| Authors:
Christopher E. Haave; Phil M. Haun; AIR UNIV MAXWELL AFB AL
|
| In May 1999, our 81st Expeditionary Fighter Squadron (EFS) was flying out of Gioia del Colle Air Base (AB), Italy, conducting around-the-clock combat operations in support of Operation Allied Force (OAF). In the midst of this, several pilots began talking about writing a book. Those of us who were airpower and mllitary-history buffs noticed that the combat we were experiencing was far different from much of what we had studied. ... |
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| An Investigation of Open Loop Flight Control Equations of Motion Used to Predict Flight Control Surface Deflections at Non-Steady State Trim Conditions (Project HAVE TRIM) |
DEC 2003 |
184 pages |
| Authors:
Gary D. Miller; Fabrizio Beccarisi; E. J. Teichert; Matthew W. Higer; Peter A. Wenell; AIR FORCE FLIGHT TEST CENTER EDWARDS AFB CA
|
| This report presents the results of Project HAVE TRIM, An Investigation of Open Loop Flight Control Equations of Motion Used To Predict Flight Control Surface Deflections at Non-Steady State Trim Conditions. The overall test objective was to validate the HAVE TRIM model through comparison of predicted control surface deflections with flight test measured control surface deflections at specified trimmed conditions. The USAF Test Pilot School, Class 03A, conducted 10 flights ... |
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| Quantifying the Impact of Aircraft Cannibalization |
DEC 2003 |
27 pages |
| Authors:
C. R. Cassady; Alejandro Mendoza; Stephen Ormon; Kellie Schneider; Chase Rainwater; Mauricio Carrasco; Jonathan Crawford; Jason Honeycutt; ARKANSAS UNIV FAYETTEVILLE DEPT OF INDUSTRIAL ENGINEERING
|
| The primary objective of this project was to develop a mathematical modeling methodology for assessing the impact of cannibalization on fleet performance in order to identify policies for making effective cannibalization decisions and to study the impact of these policies on management of the spare parts supply chain. To achieve this objective, we pursued two research avenues in parallel. First, we developed and analyzed a "generic" cannibalization model. This discrete-event ... |
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| The Use of Decision Models in the Development of a Collaborative Integrated Solutions Systems |
DEC 2003 |
112 pages |
| Authors:
Heather Nachtmann; Justin Hunter; Bryan Hill; Brian Waters; David Rieske; Jonathan King; Terry R. Collins; ARKANSAS UNIV FAYETTEVILLE DEPT OF INDUSTRIAL ENGINEERING
|
| The Logistics Readiness Program supports the Air Force Research Laboratory, Human Effectiveness Directorate, Warfighter Readiness Research Division, Logistics Readiness Branch (AFRL/HEAL) through the conduct of logistics research studies that leverage the expertise of the academic community. This research is the product of a collaborative project conducted by personnel at AFRL/HEAL and the University of Arkansas. The AFRL/HEAL identified a need to have a strategically aligned performance measurement system for flightline ... |
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| Configuration Studies Supporting Design/Assessment of Sensor Craft |
21 NOV 2003 |
70 pages |
| Authors:
Rajendar K. Nangia; NANGIA AERO RESEARCH ASSOCIATES BRISTOL(UNITED KINGDOM)
|
| This report results from a contract tasking Nangia Aero Research Associates as follows: The objective of the proposed work is to support on-going research at the Configuration Aerodynamics Branch (AFRL/VA) for design/ assessment of a Sensor Craft configuration. The sensor aircraft is subject to challenging flight envelope (mission profile). The design at present is relatively "fluid". Box wings of different layouts arise. It has to cruise and loiter (very high ... |
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| European Industrial Co-Operation |
NOV 2003 |
21 pages |
| Authors:
Jaap DE Die; ROYAL NETHERLANDS ARMY THE HAGUE
|
| Briefing charts from presentation on European industrial cooperation at the NATO-Partnership for Peace Industry/National Modelling and Simulation Partnerships conference. |
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| Winged Crusade: The Quest for American Aerospace Power |
OCT 2003 |
78 pages |
| Authors:
AIR FORCE ACADEMY COLORADO SPRINGS CO
|
| This bibliography lists a selected portion of the McDermott (Cadet) Library's holdings on the American experience of manned powered flight during the twentieth century. Excluded are newspaper articles, most pictorial works, works dealing with lighter-than-air flight and studies of rotorcraft. |
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| Calibration and Optimization of Constant Voltage Hot-Wire Anemometer in Hypersonic Flows |
OCT 2003 |
58 pages |
| Authors:
Ndaona Chokani; NORTH CAROLINA STATE UNIV AT RALEIGH OFFICE OF CONTRACTS AND GRANTS
|
| Freestream and boundary layer measurements are made in a supersonic flow using both constant temperature (CTA) and constant voltage (CVA) anemometry. The performance of both anemometers is systematically made by operating the same hot-wire under identical conditions and applying post-test software corrections to the fluctuating measurements. In the case of the CVA the in situ time constant of the hot wire is measured to compensate the measured CVA output. The ... |
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| Characterization of Pulsed Vortex Generator Jets for Active Flow Control |
OCT 2003 |
14 pages |
| Authors:
Carl P. Tilmann; Kevin J. Langan; John G. Betterton; Mark J. Wilson; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
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| The flowfields produced by several active and passive flow control devices are being investigated experimentally and numerically as part of co- operative effort between the US Air Force Research Laboratory and the UK's Defense Evaluation & Research Agency (DERA). This manuscript reports the results of an experimental investigation of pulsed vortex generator jets (PVGJs) conducted at DERA's Boundary Layer Facility in Bedford. The focus of these tests was to investigate ... |
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| Augmenting Camera Images for Operators of Unmanned Aerial Vehicles |
OCT 2003 |
|
| Authors:
Hans Veltman; Arjen Oving; HUMAN FACTORS RESEARCH INST TNO SOESTERBERG (NETHERLANDS)
|
| Unmanned aerial vehicles (UAVs) do not have pilots on board, but operators are very important for the control of the system during operation. Due to a high level of automation, steering of the platform has become relatively easy and most often UAVs follow pre-programmed waypoints. However, manual camera steering is often required. To control the camera, a steering signal from a control station is sent to the camera. The camera ... |
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| Automatic Dependent Surveillance - Broadcast/Cockpit Display of Traffic Information: Pilot Use of the Approach Spacing Application |
OCT 2003 |
20 pages |
| Authors:
O. V. Prinzo; Alfred M. Hendrix; FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST
|
| Pilots may benefit from surveillance technology that enhances their ability to maintain pre-determined distances from other aircraft during initial and final approach. Avionics that provide a cockpit display of traffic information (CDTI) enable pilots to acquire, verify, establish, and maintain pre-defined spacing intervals from other aircraft. It is of interest to the Federal Aviation Administration to determine how the use of these displays influences safety, capacity, and efficiency. The second ... |
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| Turbulent Sensitivity Analysis for Enhancing Future Aircraft |
OCT 2003 |
28 pages |
| Authors:
Andrew G. Godfrey; AEROSOFT INC BLACKSBURG VA
|
| The sensitivity-equation method has been extended to accommodate three-dimensional, unstructured mesh topologies. The method is developed and demonstrated for inviscid, laminar and the two-equation turbulence models. Performance is enhanced by implementing a MPI parallel capability as well as a graphical user interface. For all cases, solutions to the linear sensitivity equations require less than 10% of the computational time required to solve the non-linear flow problem. A central-difference utility is ... |
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| Nondestructive Evaluation (NDE) Technology Initiative Program (NTIP). Delivery Order 0032: MAUS Implementation for Corrosion/Crack Detection in Wing Structure - Phase III |
30 SEP 2003 |
48 pages |
| Authors:
Donald D. Palmer Jr.; Nancy L. Wood; BOEING CO ST LOUIS MO PHANTOM WORKS
|
| This report summarizes the results of Phase III of the "MAUS implementation for Corrosion/Crack Detection in Wing Structure" program. During Phase III, all system optimization activities, including hardware and software enhancements to improve ultrasonic pulse-echo data collection and data interpretation, were completed. Also completed was the B-52 upper wing spanwise splice inspection process development and validation. The automated second layer ultrasonic inspection procedure developed was designed to rapidly detect fatigue ... |
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| Opportunities and Approaches for Doubling the Structural Efficiency of Metallic Materials |
09 SEP 2003 |
63 pages |
| Authors:
Daniel B. Miracle; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| Briefing charts of presentation on the opportunities and approaches for doubling the structural efficiency of metallic materials. |
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| The Air Force KC-767 Tanker Lease Proposal: Key Issues for Congress |
02 SEP 2003 |
87 pages |
| Authors:
Christopher Bolkcom; DEFENSE ACQUISITION UNIV FT BELVOIR VA
|
| The Air Force wishes to replace its KC-135E aircraft by leasing 100 new Boeing KC-767 tankers. The Air Force indicates that leasing is preferred because it will result in faster deliveries than outright purchasing. Air Force leaders argue that a lease will allow them to husband scarce procurement dollars by making a small down payment. Although Congress authorized the proposed lease in the FY2002 DOD Appropriations Act, it stipulated that ... |
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| The Evolution, Revolution, and Challenges of Handling Qualities |
SEP 2003 |
27 pages |
| Authors:
David G. Mitchell; David B. Doman; David L. Key; David H. Klyde; David B. Leggett; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| The need for good aircraft handling qualities has been apparent since the days of the Wright Flyer. In the past decade, there has been a perception that this need has lessened as advanced concepts have evolved, in parallel with acquisition reform. The former has led those who are unfamiliar with the field of handling qualities to conclude that quantitative requirements are not necessary, as the latter has resulted in the ... |
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| Maintenance Mentor |
SEP 2003 |
220 pages |
| Authors:
John T. Jacobs; Randall Whitaker; Dave Byler; David A. Lemery; Brian E. Tidball; NORTHROP GRUMMAN INFORMATION TECHNOLOGY FAIRBORN OH
|
| Maintenance Mentor (MXM) is a research effort conducted by a joint AFRL/HESR and Northrop Grumman Information Technology team to identify the basic, high-level requirements necessary for improving flight line diagnostic capabilities. The effort was initially focused on identifying specific informational and visual requirements and needs of the maintainer for a specific avionics diagnostics task on a specific aircraft. Soon after its start, however, redirection of the project began to move ... |
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| Nondestructive Evaluation (NDE) Technology Initiatives Program (NTIP) delivery Order 0043: Upgrade of Computed Tomography Facility |
SEP 2003 |
5 pages |
| Authors:
S. T. Neel; UNIVERSAL TECHNOLOGY CORP DAYTON OH
|
| The two aging CT systems in Building 71 at Wright-Patterson AFB were analyzed to determine the current state of computer and other hardware, and to define an upgrade plan to improve supportability and enhance system performance. The Tomoscope CT system became the focus of the project. The Tomoscope gantry control computer was a Compaq 386-processor-based PC, which included several one-of-a-kind processor boards. The gantry control interface module included aging wire-wrap ... |
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| The Air Force KC-767 Lease Proposal: Key Issues for Congress |
29 AUG 2003 |
|
| Authors:
Christopher Bolkcom; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| The Air Force wishes to replace its KC-135E aircraft by leasing 100 new Boeing KC-767 tankers. The Air Force indicates that leasing is preferred because it will result in faster deliveries than outright purchasing. Air Force leaders argue that a lease will allow them to husband scarce procurement dollars by making a small down payment. Although Congress authorized the proposed lease in the FY2002 DOD Appropriations Act, it stipulated that ... |
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| Logistics: Condition Based Maintenance-Plus (D-2003-125) |
27 AUG 2003 |
21 pages |
| Authors:
INSPECTOR GENERAL DEPT OF DEFENSE ARLINGTON VA
|
| This audit was initiated to determine whether DoD was still achieving the maintenance savings from reliability centered maintenance that were identified in Inspector General of the Department of Defense Report No. 91-098, "Aircraft Depot Maintenance Programs," June 17, 1991. During the survey phase of this audit, we found that DoD was implementing a new maintenance concept (condition based maintenance- plus) that focuses on the actual condition of the weapon system ... |
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| Technical Evaluation and Report |
27 AUG 2003 |
14 pages |
| Authors:
M. A. Holly; N. Sinha; T. A. Weisshaar; BOEING CO ST LOUIS MO
|
| The defense of NATO requires a new paradigm in the development and deployment of weapon systems. The development and integration of weapon systems modeling and simulation from concept to operation, as envisioned by both the RTO MSG and AVT Panels, are essential to achieving the cost and time reductions needed to field new and improved weapon systems. Improved design simulation tools and advanced modeling methods, coupled with a maturing set ... |
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| Advances in Product Modelling and Simulation at Dassault Aviation |
27 AUG 2003 |
8 pages |
| Authors:
Lionel DE LA Sayette; DASSAULT AVIATION SAINT-CLOUD (FRANCE)
|
| Aerospace industry has always been in the forefront in relying as much as possible on modelling and simulation to continuously increase global efficiency of product development and realization. A comprehensive combination of partial tests and simulation stands as a low-cost approach to limit the number of necessary prototypes to design, develop and qualify a new product, For more than 30 years Dassault Aviation has invested large efforts in the field ... |
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| Collaborative Product Development Supported by Modelling and Simulation |
27 AUG 2003 |
10 pages |
| Authors:
Billy Fredriksson; Gunnar Holmberg; Johan Lilliecreutz; SAAB AEROSPACE LINKOEPING (SWEDEN)
|
| The development of aircraft involves many actors throughout the supply chain. The rationale for forming partnerships and selecting suppliers ranges from risk sharing, knowledge access to price and reliability of supply. The product, subject to many design drivers, uses a wide range of technologies in highly optimized conditions with ever-increasing cost pressure. The lifetime for technologies and subsystems, clockspeed, ranges over more than an order of magnitude between software functionality ... |
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| Reducing Military Aircraft Engine Development Cost through Modeling and Simulation |
27 AUG 2003 |
12 pages |
| Authors:
Charles A. Skira; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH TURBINE ENGINE DIV
|
| In the past thirty years, weapon systems development costs have been steadily increasing with each succeeding system costing mow than the last one. In fact, the cost of developing a new weapons system may become a factor in deciding whether a new system is procured or not. Clearly, there is a need to reduce the cost of developing new military systems. Besides the obvious benefit of saving real dollars at ... |
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| The Digital Mock-up as a Virtual Working Environment within the Development Process |
27 AUG 2003 |
10 pages |
| Authors:
Steffen Kaun; EUROPEAN AERONAUTIC DEFENCE AND SPACE DEUTSCHLAND GMBH MUNCHEN (GERMANY)
|
| The need for a reduction of engineering time and cost during the last years made an optimization of the development processes inevitable, In order to defend their market shares, all companies were forced to employ more efficient development methodologies and to bring all their software tools up to date, As a result the CAD world for new projects has essentially changed from the 2D to 3D world, However, from an ... |
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| The Factory is Virtual...The Savings are Real |
27 AUG 2003 |
8 pages |
| Authors:
Robert G. Brown; John M. Caddick; DELMIA CORP TROY MI
|
| Modeling and simulation of manufacturability and supportability have been used to different degrees in the JSF, AAAV, DD-21, Future Frigate, Virginia Class Submarine, and many lifecycle extension programs The use of digital manufacturing tools has resulted in innovative manufacturing techniques to significantly reduce tooling cost and to create modular build and test methodologies Supportability studies have impacted designs to reduce lifecycle costs by reducing manning levels, by eliminating the need ... |
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| A Data-Centric Infrastructure for Multidisciplinary Analysis Integration and Management |
27 AUG 2003 |
11 pages |
| Authors:
Jean-Yves Trepanier; Francois Guibault; Benoit Ozell; CENTRE DE RECHERCHE EN CALCUL APPLIQUE MONTREAL (QUEBEC)
|
| This paper presents the overall architecture of the VADOR application framework. The purpose of the VADOR framework is to enable the seamless integration of commercial and in-house analysis applications in a heterogeneous, distributed computing environment, to allow the deployment of automatic design optimization algorithms and to provide a comprehensive data management infrastructure for design and analysis data. The emerging database will then provide the basis of a future knowledge-based engineering ... |
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| Integrated Design and Analysis of an Aircraft Fuel System |
27 AUG 2003 |
11 pages |
| Authors:
R.M. Tookey; M. G. Spicer; D. J. Diston; BAE SYSTEMS LANCASHIRE (UNITED KINGDOM)WARTON AERODROME
|
| Using an aircraft fuel tank as an industrial case-study, the paper describes some recent research developments at BAE SYSTEMS that allow the airframe and systems life-cycles to become better aligned. In particular, the paper demonstrates that the design and analysis of the fuel system can be integrated with the airframe structure. This will reduce qualification times in the future and enable Simulation Based Acquisition (SBA), that is, the procurement of ... |
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| Multi-Disciplinary Simulation of Vehicle System Dynamics |
27 AUG 2003 |
16 pages |
| Authors:
W. R. Krueger; O. Vaculin; W. Kortuem; DEUTSCHES ZENTRUM FUR LUFT-UND RAUMFAHRT (DLR) WESSLING (GERMANY) INST OF AEROELASTICITY
|
| Modeling and computer simulation play an important role in all engineering disciplines. As specialized simulation tools have become very sophisticated and, at the same time, the simulation of complex systems and phenomena showed the limits of mono-disciplinary approaches, multi-disciplinary simulation has gained wide acceptance. For the coupling of different simulation tools interfaces are necessary, including both aspects of physics and numerics as well as of software engineering. This paper tries ... |
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| Impact of System-Level Engineering Approaches on the Airframe Development Cycle Via Integration of KBE with CAD Modeling and PDM |
27 AUG 2003 |
12 pages |
| Authors:
Frederick Emch; ELECTRONIC DATA SYSTEMS MARYLAND HEIGHTS MO
|
| A classic airframe development problem is the disconnect between initial layouts/trade studies of structural arrangements and the detail designs that emanate from these layouts. Hence, the process of communicating design change has been time consuming, inefficient, and prone to errors. This paper describes new methods now available that enable the linkage between system-level layouts and the digital master models. Knowledge-Based Engineering (KBE) tools can now be directly linked to preliminary ... |
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| Virtual Testing with Validated Analysis Tools |
27 AUG 2003 |
12 pages |
| Authors:
Craig Collier; Duane Veley; Steve Owens; COLLIER RESEARCH CORP HAMPTON VA
|
| Collier Research Corporation is working with Lockheed Martin Aeronautics (LM Aero) under United States Air Force Research Lab (AFRL) funding to develop a "certification-by-analysis" process to reduce unexpected failures during experimental testing that will, in turn, accelerate Air Force structural certification. The goal is early identification and avoidance of conceptual and preliminary design problems on new and sustaining aircraft programs using a "design-by-analysis" process that includes the commercial structural sizing ... |
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| Analytical Qualification of Composite Structures |
27 AUG 2003 |
19 pages |
| Authors:
G. A. Davies; D. Hitchings; IMPERIAL COLL OF SCIENCE AND TECHNOLOGYLONDON (UNITED KINGDOM) DEPT OF AERONAUTICS
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| The feasibility of replacing substructure and component testing by analytical "virtual testing" is addressed here for composite structures. The special difficulties in estimating the failure loads of composite structures are described, especially when initiation starts from a local stress concentration. Damage may initiate and then propagate, but final failure can occur at loads significantly higher than that for initiation. The separate modes of in-plane (fibre-dominated) and delamination (matrix dominated) are ... |
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| Using High-Fidelity Analysis Methods and Experimental Results to Account for the Effects of Imperfections on the Buckling Response of Composite Shell Structures |
27 AUG 2003 |
14 pages |
| Authors:
James H. Starnes Jr.; Mark W. Hillburger; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER
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| The results of an experimental and analytical study of the effects of initial imperfections on the buckling response of unstiffened thin-walled compression-loaded graphite-epoxy cylindrical shells are presented. The analytical results include the effects of traditional and nontraditional initial imperfections and uncertainties in the values of selected shell parameters on the buckling loads of the shells. The nonlinear structural analysis results correlate very well with the experimental results. The high-fidelity nonlinear ... |
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Aircraft
