| Climate and Weather Analysis of Afghanistan Thunderstorms |
Sep 2011 |
169 pages |
| Authors:
Chad E Geis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
 | Thunderstorms are a significant factor in the planning and execution of Department of Defense (DoD) operations in Afghanistan, especially in the spring and summer. Skillful forecasting of Afghanistan thunderstorms has proven difficult, even at relatively short lead times of 24 hours or less. This has led to adverse effects on a wide range of DoD missions. One potential reason for the forecasting difficulties is a lack of understanding of the ... |
|
| Optimal Parameters for Maneuverability of Affordable Precision Munitions |
Aug 2011 |
42 pages |
| Authors:
Frank Fresconi; Ilmars Celmins; Luisa Fairfax; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| High maneuverability of guided projectiles enables engagement of fleeing targets, opens the area of influence of a weapons system, and allows new missions to be performed such as prosecuting targets in defilade. Gun-launched precision munitions have unique constraints that create technical barriers to achieving enhanced maneuverability. Structural integrity during the gun launch event, packaging control surfaces within the launch tube, and affordability are paramount concerns. This work is a fundamental ... |
|
| Control Authority of a Mortar Using Internal Translating Mass Control |
Jun-2009 |
28 pages |
| Authors:
Ilmars Celmins; Jonathan Rogers; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| This report examines the control authority of an 81-mm mortar projectile equipped with an internal translating mass. The translating mass undergoes controlled motion within the projectile body, resulting in a lateral mass center offset that creates a drag-induced moment. This moment can be utilized to guide the round to a target. Several example studies demonstrate basic control authority characteristics, while trade studies examine the effect of projectile static stability as ... |
|
| Deriving Sea Surface Salinity and Density Variations From Satellite and Aircraft Microwave Radiometer Measurements: Application to Coastal Plumes Using STARRS |
MAR 2008 |
22 pages |
| Authors:
Derek M. Burrage; Joel C. Wesson; Jerry Miller; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| Using brightness temperature Tb measurements from L-band airborne microwave radiometers, with independent sea surface temperature (SST) observations, sea surface salinity (SSS) can be remotely determined with errors of about 1 psu in temperate regions. Nonlinearities in the relationship between $Tb$, SSS, and SST produce variations in the sensitivity of salinity S to variations in Tb and SST. Despite significant efforts devoted to SSS remote sensing retrieval algorithms, little consideration has ... |
|
| Atmospheric Effects on Winter SO2 Pollution in Lanzhou China |
01-Jan-2008 |
30 pages |
| Authors:
Peter C Chu; Yuchun Chen; Shihua Lu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA NAVAL OCEAN ANALYSIS AND PREDICTION LAB
|
| Lanzhou is one of the most polluted cities in China SO2 concentration has evident seasonal variability It is generally within the second-level criterion (< 0.15 mg m sub-3) in spring, summer, and fall, but is much higher than the second-level criterion and sometimes reaches mid level pollution (API > 200) in winter Meteorological conditions (low winds, stable stratification) are found to be important for the SO2 pollution Observational and modeling ... |
|
| The Interaction of Jet/Front Systems and Mountain Waves: Implications for Lower Stratospheric Aviation Turbulence |
01-Jan-2008 |
217 pages |
| Authors:
David R Vollmer; NORTH CAROLINA STATE UNIV AT RALEIGH
|
| The role of jet streaks and their associated upper-level structures (fronts, troughs, thermal fields, etc.) in enhancing orographically-induced aviation turbulence near and above the tropopause is investigated. The primary hypothesis for this research suggests that there is an optimal configuration for the positioning of upper-level circulations leading to vertically confluent flow and differential thermal advection, forming an intense inversion. Such a configuration may be associated with vertically-intersecting ageostrophic jet circulations ... |
|
| Deriving Sea Surface Salinity and Density Variations from Satellite and Aircraft Microwave Radiometer Measurements: Application to Coastal Plumes Using STARRS |
NOV 2007 |
22 pages |
| Authors:
Derek Burrage; Joel Wesson; Jerry Miller; C. Cabarro; J. Font; A. Camps; A. Piola; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| Using brightness temperature Tb measurements from L-band airborne microwave radiometers, with independent sea surface temperature (SST) observations, sea surface salinity (SSS) can be remotely determined with errors of about 1 psu in temperate regions Nonlinearities in the relationship between Tb, SSS and SST produce variations in the sensitivity of salinity S to variations in Tb and SST. Despite significant efforts devoted to SSS remote sensing retrieval algorithms, little consideration has ... |
|
| Improved Correlations for Augmentor Static Stability (Postprint) |
AUG 2007 |
|
| Authors:
Barry V. Kiel; Darin A. Knaus; Patrick J. Magari; Roger W. Hill; Scott D. Phillips; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
 | Flame stability is critical to the operational performance of combustion systems in propulsion and power generation. Current predictive tools for flame stability are based on decades-old empirical correlations that have limited applicability for modern combustor designs. Recent advances in computational fluid dynamics (CFD) and advanced combustion diagnostics have provided new insight into the fundamental processes that occur in these flows. Reacting-flow CFD has yet to mature to a level where ... |
|
| Free-to-Roll Study of Uncommanded Lateral Motions for the Vented Strake F/A-18E/F |
12 MAY 2005 |
65 pages |
| Authors:
Elaine Melendez Bryant; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| A free-to-roll study was conducted on the lateral characteristics of a 10% scale model pre-production vented strake F/A-18E/F. This study carried out both static force and moment tests along with free-to-roll tests to determine the correlation to previous studies, assess the lateral motion, and verify free- to-roll as a viable test technique for the determination of uncommanded lateral motion potential. Static force and moment tests established correlation with previous studies. ... |
|
| Free-to-Roll Study of Uncommanded Lateral Motions for the Vented Strake F/A-18E/F |
07 APR 2005 |
62 pages |
| Authors:
Elaine M. Bryant; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| A free-to-roll study was conducted on the lateral characteristics of a 10% scale model pre-production vented strake F/A-18E/F. This study carried out both static force and moment tests along with free-to-roll tests to determine the correlation to previous studies, assess the lateral motion, and verify free- to-roll as a viable test technique for the determination of uncommanded lateral motion potential. Static force and moment tests established correlation with previous studies. ... |
|
| Mission Level Mobility Analysis of the U.S. Marine Corps HIMARS Vehicles |
FEB 2004 |
128 pages |
| Authors:
Randolph A. Jones; Stephanie J. Price; Richard B. Ahlvin; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB
|
| The U.S. Army Engineer Research and Development Center (ERDC), Vicksburg, MS, conducted a vehicle mobility analysis for the U.S. Marine Corps (USMC) High Mobility Artillery Rocket System (HIMARS) to identify the different mission profiles the prime transporters (the USMC Medium Tactical Vehicle Replacement (MTVR) and the MK48-14 Logistics Vehicle System (LVS)) may encounter during worldwide deployment. The proposed mission profile evaluation program focused on using computer-based digital terrain and vehicle ... |
|
| A Quasi-Steady Evaluation of Submarine Rising Stability: The Stability Limit |
MAR 2003 |
|
| Authors:
George D. Watt; Jan Hooft; DEFENCE RESEARCH ESTABLISHMENT ATLANTICDARTMOUTH (NOVA SCOTIA)
|
| When submarines blow ballast to the surface from deep depths in an emergency, they can experience roll instability if they ascend with a large flow incidence angle. It is shown that an instability is caused by the destabilizing hydrodynamic rolling moment on the sail (which points upwards into the onset crossflow) overcoming the static righting moment (the center of gravity is below the center of buoyancy) as the boat is ... |
|
| Examination of the 13 February 2001 Eastern Pacific Maritime Cyclogenesis |
MAR 2002 |
63 pages |
| Authors:
Marc E. Touchton; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| On 13 February 2001, an explosive cyclone made landfall in Southern California. This system was responsible for storm force winds and heavy precipitation in the Los Angeles area. This storm is interesting because it was handled poorly by the numerical models and developed in an unusual area. Analysis of this storm revealed double circulation centers and multiple baroclinic zones. Due to weak static stability, air-sea fluxes were contributory in developing ... |
|
| Effect of Body Cross Section on Projectile Aerodynamic Performance With Application to Electromagnetic (EM) Guns |
APR 2001 |
36 pages |
| Authors:
Paul Weinacht; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The most effective bore cross-section geometry for electromagnetic (EM) guns may differ significantly from the circular cross section of conventional guns. The geometry of the bore cross section will influence the shape of the armature/subprojectile launch package. For certain applications, a noncircular cross section may provide payload packaging benefits which have not been considered previously for conventional circular cross-section guns. Whether these benefits can be fully realized depends, in part, ... |
|
| Enhancement to Repair Assessment Procedure and Integrated Design (RAPID) . Analysis Methods Enhancements |
JUN 2000 |
319 pages |
| Authors:
Chun Chen; Miles Nomura; Jin Yu; BOEING CO LONG BEACH CA
|
| This document describes the technical details of the analysis methodology used in the static and damage tolerance analysis modules of the Repair Assessment Procedure and Integrated Design (RAPID) program. In this document, the static strength analysis method for repaired fuselage skin and skin modifications to antenna installation is first described. Next, a description of the damage tolerance method is provided. This document also includes descriptions of the methods developed for ... |
|
| Influence of Downflooding on Iroquois Class Damage Stability |
MAR 2000 |
|
| Authors:
Kevin A. McTaggart; DEFENCE RESEARCH ESTABLISHMENT ATLANTICDARTMOUTH (NOVA SCOTIA)
|
| This report examines stability in waves of a damaged Iroquois class ship. Stern asymmetric flooding is the limiting design case for the Iroquois class. To reduce heel angle for this limiting case, DND is considering installing ports to permit downflooding to lower compartments, resulting in a lower center of gravity for the damaged ship. The computer program FREDYN has been used to examine motions in waves for the damaged ship ... |
|
| Results of Experiments With a Segmented Model to Investigate the Distribution of the Hydrodynamic Forces and Moments on a Streamlined Body of Revolution at an Angle of Attack or With a Pit |
FEB 2000 |
49 pages |
| Authors:
Eric F. Van Randwijck; Jerome P. Feldman; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD HYDROMECHANICS DIRECTORATE
|
| The hydrodynamic forces and moments which are developed on unappended streamlined bodies of revolution at small and large angles of attack or with a pitching angular velocity were investigated by captive-model experiments and by theory. The captive-model experiments were performed with a segmented model of a Series 58 body in the deep water basin of the David Taylor Model Basin and on the rotating arm. Exact and ... |
|
| Turbulent Dissipation in Frontal Zones from Hot-Wire Measurements in theMICROFRONTS Experiment |
SEP 1999 |
8 pages |
| Authors:
William Blumen; COLORADO UNIV AT BOULDER
|
| Measurements of turbulent dissipation of kinetic energy have been taken of synoptic and small scale density frontal passages during the MICROFRONTS (MARCH 1999, Kansas) field program. It is revealed that there is a significant increase of turbulent kinetic energy during each-passage of the frontal transition zone. Data analyses suggest a linear relationship between the frontal width and the enhanced kinetic energy dissipation rate. A theoretical ... |
|
| Nonlinear Time-Domain Simulation of Fishing Vessel Capsizing in Quartering Seas |
APR 1998 |
43 pages |
| Authors:
Woei-Min Lin; Michael J. Meinhold; Nils Salvesen; SCIENCE APPLICATIONS INTERNATIONAL CORPANNAPOLIS MD
|
| Ship design practice has been to measure stability by static criteria and to compensate for dynamic effects through a margin of safety. However, there is a fundamental difference between static and dynamic stability. Certain factors that result in favorable static stability characteristics may actually present greater danger when considered in light of a dynamic analysis. Traditional linear strip theory methods are not suitable for assessing ship capsizing. The main objective ... |
|
| Nonlinear Time-Domain Simulation of Ship Capsizing in Beam Seas |
NOV 1997 |
69 pages |
| Authors:
Woei-Min Lin; Nils Salvesen; SCIENCE APPLICATIONS INTERNATIONAL CORPANNAPOLIS MD
|
| Ship design practice has been to measure stability by static criteria and to compensate for dynamic effects through a margin of safety. However, there is a fundamental difference between static and dynamic stability. Certain factors which result in favorable static stability characteristics may actually present greater danger when considered in light of a dynamic analysis. The traditional linear strip theory method is not suitable for assessing ship capsizing. This report ... |
|
| Conceptual Study of Articulated Stable Ocean Platform. Part 1 |
06 MAY 97 |
119 pages |
| Authors:
Trevor R. Mills; Zhihuang Ran; MCDERMOTT ENGINEERING HOUSTON LLC TX
|
| A conceptual study has been completed to evaluate the feasibility of a new concept of a floating storage platform - the Articulated Stable Ocean Platform (ASOP). The unique aspects of the ASOP is the articulation of the stabilize buoys which were introduced for the purposes of reducing wave load and overall vessel motion. The ASOP was designed to have a fuel storage capability of 1 million barrels and to support ... |
|
| Amphibious Cargo Beaching (ACB) Lighter Development - Phase I |
OCT 96 |
419 pages |
| Authors:
KVAERNER MASA MARINE INC ANNAPOLIS MD
|
| This report documents a conceptual design effort for the Amphibious Cargo Beaching (ACB) Lighter, a modular barge system which is being developed to replace the Navy Lighter (NL) pontoon causeway system. The ACB Lighter will be rapidly deployed from an auxiliary crane ship and be assembled and operated in sea conditions through sea state three to support Joint Logistics Over the Shore (JLOTS) operations. Results are presented for three major ... |
|
| Meteorological Factors Responsible for Flooding in Central Texas during December, 1991 |
10 SEP 95 |
149 pages |
| Authors:
Rodney L. Clements; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Flooding occurred on 18 - 23 December 1991, in the Highland Lakes Region (HLR) of Central Texas. It will be shown that many meteorological factors were responsible for the flooding. |
|
| Damage Stability Model Test for the Advanced Double Hull (ADH) Program |
APR 95 |
37 pages |
| Authors:
Paul J. Kopp; Richard Bishop; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD HYDROMECHANICS DIRECT ORATE
|
| A series of dynamic damage stability model tests have been performed on a CG-47 hull form filled with a double hull test section. These tests were carried out in support of the static and dynamic stability sub-tasks of the Advance Double Hull (ADH) Project. Various combinations of flooding conditions were investigated in regular beam seas, with and without wind. The model was subjected to regular waves ranging from 2.2 to ... |
|
| Static Aerodynamics CFD Analysis for 120-mm Hypersonic KE Projectile Design |
SEP 94 |
40 pages |
| Authors:
Bernard J. Guidos; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Computational fluid dynamics (CFD) predictions of static aerodynamic coefficients for large caliber (120-mm) M829-like cone-cylinder-flare kinetic energy (KE) projectile shapes are presented. Zero-yaw drag and static pitch- plane aerodynamic coefficients are presented for velocities in the range 1.5 to 3.0 km/sec for several flare angles. The aerodynamic coefficients are required to assess the velocity retardation and static stability of candidate configurations that use the M829 projectile as a basis for ... |
|
| Hypersonic Wind Tunnel Test Techniques |
AUG 94 |
57 pages |
| Authors:
R. K. Matthews; R. W. Rhudy; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
|
| This report describes the procedures used in the continuous flow hypersonic tunnels of the AEDC for static stability, pressure, heat transfer, materials/structures, boundary-layer transition, and electromagnetic wave testing. Particular emphasis is placed on heat-transfer techniques because of the importance of defining the thermal environment of hypersonic vehicles. An overview of the materials/structures test methodology used in the development of hypersonic vehicle components is presented. Unfortunately the methodology to predict transition ... |
|
| Plant/Controller Optimization by Convex Methods |
JUN 94 |
|
| Authors:
Robert J. Niewoehner Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This report presents results of a three phase effort to demonstrate the use of convex control design techniques in aeronautical applications. The first phase was the demonstration of a methodology by which classical aircraft controller design requirements could be translated into the weighting matrices for H infinity controller synthesis. The second phase extended that methodology to the design of mixed H2 / H infinity controllers. The third phase considered the ... |
|
| A Handling Qualities Investigation of Conventional, Rate Command/ Attitude Hold, and Attitude Command/Attitude Hold Response-Types in the Probe and Drogue Air Refueling Task |
MAR 94 |
315 pages |
| Authors:
Michael J. Taschner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This investigation examines the suitability of conventional, rate command/attitude hold (RCAH), and attitude command attitude hold (ACAH) response-types for the probe and drogue air refueling task. Data from a 1974 Calspan handling qualities investigation involving conventional response-types in the probe and drogue air refueling task were analyzed using the Bandwidth and STI Dropback criterions. Flight control laws were developed to achieve twelve superaugmented and two conventional configurations. The NT-33A analog ... |
|
| Submarine Machinery Cradle: Structural Dynamic Design and Analysis Techniques Using Frequency Domain Structural Synthesis |
MAR 94 |
187 pages |
| Authors:
Ronald E. Cook; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The tactical implications of submarine acoustic radiation and UNDEX- survivability have motivated the development of an advanced machinery cradle which will provide shock and vibration isolation of the submarine internals, thereby minimizing the resulting acoustic radiation. The cradle space frame must be designed and optimized for both minimum shock/vibration bi-directional transmissibility and minimum total cradle weight. Frequency domain structural synthesis (structural modification and substructure coupling), is applied to the cradle ... |
|
| An Analytical Study of the Dependence of Orientation and Propagation of the Arabian Sea Convection Bands on Wind Shear, Static Stability, and Preexisting Convection, |
JUN 1993 |
|
| Authors:
John R. Roadcap; Gandikota V. Rao; SAINT LOUIS UNIV MO DEPT OF EARTH AND ATMOSPHERIC SCIENCES
|
| Organization of convection into bands over the Arabian Sea during a monsoon onset was studied analytically. Observed vertical profiles of temperature, moisture, and wind velocity were used as base states by a linear model of convection to deduce the most unstable mode in the mesoscale. The analytical characteristics of bands such as width, length, and orientation were then compared with in situ aircraft observations and satellite imagery. A unique feature ... |
|
| The Effect of Latent Heat Release on the ERICA IOP-5 Cyclone |
SEP 92 |
87 pages |
| Authors:
Frank W. Baker; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The effect of latent heat release on the development of a rapidly deepening extratropical cyclone that occurred during Intensive Observation Period (IOP)5(18-20 January 1989) of the Experiment on Rapidly Deepening Cyclones over the Atlantic (ERICA) is examined using a diagnostic height tendency equation. Data consist of Nested Grid Model (NGM) forecasts executed with and without latent heating feedback. Withholding latent heat release significantly decreased the intensity of not only the ... |
|
| Flight Testing of a Half-Scale Remotely Piloted Vehicle |
MAR 92 |
62 pages |
| Authors:
Paul A. Koch; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Flight testing of a half-scale Pioneer remotely piloted vehicle was conducted to determine the longitudinal static stability flying qualities. A pulsewidth modulated telemetry system was used to provide data on control surface deflections, angle of attack, sideslip angle and airspeed. From the testing, the neutral point was determined to be 41.2% of mean aerodynamic chord, which was within l3% of theoretical predictions. On a subsequent flight, the Pioneer experienced electromagnetic ... |
|
| The Role of the Southern Ocean/Sea Ice Interaction in Global Climate Change, |
MAR 1992 |
|
| Authors:
Douglas G. Martinson; LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY
|
| The seasonal sea ice field of the Southern Ocean strongly modulates climate through its insulating effect and high albedo. Consequently, it plays a significant role in global climate and must be adequately parameterized for inclusion in large-scale circulation models attempting to predict the nature of global change. Recent field studies and modeling work show that the ice field is highly sensitive to the static stability and vertical fluxes in the ... |
|
| The Southern Ocean: Its Involvement in Global Change, |
MAR 1992 |
|
| Authors:
Arnold L. Gordon; LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY
|
| Southern Ocean is the site of considerable water mass formation which cools and ventilates the modern world ocean. At the polar front zone, formation of cool, low salinity water sinks and spreads northward at intermediate depths limiting the downward penetration of the thermocline. Within the seasonal sea ice zone and along the margins of Antarctica, convection injects very cold oxygenated water into the deep and bottom ocean. These conditions developed ... |
|
| Pitch Control Margin at High Angle of Attack-Quantitative Requirements (Flight Test Correlation with Simulation Predictions) |
92 |
42 pages |
| Authors:
J. Lackey; C. Hadfield; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| Aircraft designs that employ relaxed static stability (RSS) have the following problem: reduced pitching moments associated with RSS at high angle of attack (AOA) require a minimum pitch recovery moment or margin to guarantee a safe return from high AOA maneuvers at the most aft center of gravity (CG) encountered during a mission. Recent incidents and mishaps on Class IV aircraft have demonstrated a need for establishing quantitative longitudinal high ... |
|
| Properties of a TZP/Al2O3 Composite after Long-Term Exposure at 1000 deg C |
DEC 91 |
14 pages |
| Authors:
Jeffrey J. Swab; Steven C. Stowell; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| A commercially available tetragonal zirconia polycrystal ceramic was examined for potential use in advanced engines. Room temperature strength and toughness were determined, as well as the static fatigue life between 800 deg C and 1200 deg C. All of these properties were determined before and after a 100 hour exposure at 1000 deg C. The room temperature flexure strength was 1838 MPa before exposure and it decreased 23% after exposure. ... |
|
| Stability and Control Flight Testing of a Half-Scale Pioneer Remotely Piloted Vehicle |
SEP 91 |
74 pages |
| Authors:
Kent Robert Aitcheson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Stability and control flight testing was conducted on a half-scale Pioneer remotely piloted vehicle. The aircraft was instrumented with sensors to measure flight control deflections, angle of attack, side slip angle, and airspeed. A developmental telemetry transmitter was installed to send the information to a ground based receiver where it was recorded for computer processing. Flight tests were conducted to characterize longitudinal static stability by varying the center of gravity ... |
|
| A Generalized Intact Stability Analysis Procedure for Modular Construction Platforms |
JUN 91 |
68 pages |
| Authors:
T. Huang; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
|
| This report presents a generalized numerical procedure for evaluating the responses of a modular construction floating platform subjected to static loads. The theory employed is applicable to watertight pontoon platforms undergoing unlimited rotations. This procedure enables users to investigate platform stability under various deck load configurations. Users are able to design a pontoon platform with prefabricated modules, check the platform for static stability, and modify the platform in a sequence ... |
|
| Volume II. Flying Qualities Phase. Chapter 6: Maneuvering Flight |
OCT 90 |
53 pages |
| Authors:
AIR FORCE TEST PILOT SCHOOL EDWARDS AFB CA
|
| The method used to analyze maneuvering flight will be to determine a stick-fixed maneuver point (Hm) and stick-free maneuver point (H'm). These are analogous to their counterparts in static stability, the stick-fixed and stick- free neutral points. The maneuver points will also be derived in terms of the neutral points, and their relationship to cg location will be shown. |
|
| Application of VAX/VMS Graphics for Solving Preliminary Ship Design Problems |
29 MAR 90 |
129 pages |
| Authors:
Gerald K. McGowan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The VAX/VMS (User Interface Services), graphics library routines were used in the creation of a menu driven, interactive program which solves basic preliminary ship design problems. The program uses a menu with active mouse and keyboard to select options, enter data, and control program execution. At present, the program solves transverse and longitudinal static stability problems and predicts the effects of shifting weight in three planes. It also calculates the ... |
|
| Initialization of Cloud and Radiation in the Florida State University Global Spectral Model |
90 |
262 pages |
| Authors:
Allan M. Weiner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Satellite observed Outgoing Longwave Radiation (OLR) is used to initialize the clouds and radiation of the Florida State University Global Spectral Model. A one-parameter method and two different six-parameter methods of initialization are formulated. The one-parameter method is shown to be the most efficient and produce the best results. The effects of the cloud and radiation initialization on a five day forecast are presented. The initialization procedure a better forecast ... |
|
| Comparison of the Dynamics of a Land versus Oceanic Explosive Cyclone |
DEC 89 |
72 pages |
| Authors:
Michael E. Kreyenhagen; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Two explosively developing cyclones are analyzed and compared using a similar diagnostic approach. A continental cyclone developed over the U.S. Mid- west during 14-17 November 1988 and was analyzed using NMC (Nested Grid model) analysis fields and GOES IR imagery. A maritime cyclone rapidly developed over the western North Atlantic Ocean during 03-05 January 1989. The NMC Spectral Model and GOES imagery are employed to describe the development of this ... |
|
| Fluid Dynamic Characteristics of an Underwater Towed Sound Generator |
NOV 89 |
38 pages |
| Authors:
C. Jermey; AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
|
| An underwater towed sound generator, used in sonar research work, was found to be unstable when under tow. This document records wind tunnel tests carried out on a model of the towed vehicle. Investigations were concerned mainly with static stability characteristics and the effectiveness of various configurational changes in improving the stability of the vehicle. The reasons for the original instability are identified and proposals are presented for some minimal ... |
|
| Material Instabilities in Solids |
31 OCT 89 |
11 pages |
| Authors:
Scott J. Spector; SOUTHERN ILLINOIS UNIV AT CARBONDALE DEPT OF MATHEMATICS
|
| The principal investigator considered a numbered of mathematical problems that may help to explain material failures in certain polymers and ductile metals. In particular, useful results were obtained concerning the static instability and surface cracking of a single hole and the formation of crazes in glassy polymers. (eg) |
|
| Aerodynamic Test and Analysis of a Slender Generic Missile Configuration |
SEP 89 |
10 pages |
| Authors:
Roger S. Gates; G. L. Winchenbach; John R. Cipolla; Mark A. Fische; AIR FORCE ARMAMENT LAB EGLIN AFB FL
|
| This paper discusses the aerodynamic predictions, test , and analyses of a slender fin stabilized missile configuration at Mach numbers from 1.0 to 5. 0. Prediction techniques consisted of both empirical and analytical methods, including state-of-the-art computational fluid dynamic codes. Free flight tests were also conducted on subscale models to obtain an aerodynamic baseline to which the various predictions could be compared. This paper summarizes these results, attempts to identify ... |
|
| Lift Losses for Fin-Body Gaps in Transonic and Supersonic Speeds: Data Correlation and Modeling |
SEP 89 |
42 pages |
| Authors:
Ameer G. Mikhail; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| An algebraic model is established to predict fin lift losses due to fin-body gaps for missiles and projectiles in transonic and supersonic speeds. The model is based on 2 distinct correlations which were established using wind tunnel results. The first correlation is for transonic speeds (0.8 0.08). This extends the Author's earlier work which was valid only for gap heights, /D < 0.08. The 2nd correlation is for both small ... |
|
| Robust Control Design for Flight Control |
JUL 89 |
92 pages |
| Authors:
William H. Bennett; Harold G. Kwatny; Keith Glover; TECHNO-SCIENCES INC GREENBELT MD
|
| This project studies the application of new and advanced methods of control law synthesis for robust stabilization with respect to a combination of both unstructured model uncertainty (arising from neglected parasitic dynamics) and structured model uncertainty (arising from parametric variations which occur as flight conditions change). Efforts have focused on the characterization of a class of nonlinear models for longitudinal dynamics of aircraft in level flight subject to changes in ... |
|
| Computational Approaches to Protein Structure Design: beta-Bellin |
23 JAN 89 |
20 pages |
| Authors:
Jiri Novotny; HARVARD MEDICAL SCHOOL BOSTON MA
|
| Based on the known principles that govern protein folding of polypeptide chains into antiparallel B-sheet structures, a small protein molecule, B-bellin, has been designed by Drs. Jane and David Richardson. In the current project, computer methods were used to evaluate the structure of B- bellin models and , more generally, to answer fundamental questions about the relations among molecular geometry, atomic potential energy, and static stability of B-sheeted proteins. Using ... |
|
| A Wind Tunnel and Computer Investigation of the Low Speed Aerodynamic Characteristics of the Prone Escape System (PRESS) |
DEC 88 |
104 pages |
| Authors:
Lonnie R. Dillon; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Due to new design technology, future jet fighters will fly at higher g levels than before. A previous preliminary design study was conducted to develop an ejection seat providing higher g-tolerance for the crewmember during maneuvering as well as improved windblast protection during ejection. This seat used the crewmember in a prone, or leaning forward, position. The Prone Ejection System was computer simulated at supersonic conditions in the earlier report ... |
|
| Study of Explosive and Nonexplosive Cyclogenesis During FGGE(First Global Garp Experiment) |
DEC 88 |
87 pages |
| Authors:
Eric J. Wright; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The purpose of this thesis is to analyze and evaluate explosive cyclogenesis during the winter of the First Global GARP Experiment (January to February 1979). Explosive cyclogenesis is defined as a decrease in the sea-level pressure at the rate of one mb per hour for a period of 12 h up to 24 h. The European Centre for Medium-range Weather Forecasts (ECMWF) provided the revised analyses for evaluation and comparison ... |
|
Reports by Keyword(s)
STATIC STABILITY
