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357

Jun 27, 2010
06/10

by
Kockarts, G., et al

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No Abstract Available

Topics: DYNAMIC RESPONSE, FUEL FLOW, MATHEMATICAL MODELS, RAMJET ENGINES, FEEDBACK CONTROL, LAPLACE...

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414

Jul 5, 2010
07/10

by
Clevenson, S. A

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No Abstract Available

Topics: AIRCRAFT CONTROL, DYNAMIC RESPONSE, FLIGHT TESTS, TRANSFER FUNCTIONS, AIRCRAFT STABILITY,...

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179

Jul 12, 2010
07/10

by
Dressler, R. F

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The transient and steady thermal convection in microgravity is described. The approach is applicable to many three dimensional flows in containers of various shapes with various thermal gradients imposed. The method employs known analytical solutions to two dimensional thermal flows in simpler geometries, and does not require recourse to numerical calculations by computer.

Topics: ANTENNA COMPONENTS, DEGREES OF FREEDOM, DYNAMIC RESPONSE, FLEXIBLE BODIES, SPACE SHUTTLE ORBITERS,...

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323

May 30, 2011
05/11

by
Walthall, Charles L.; Loechel, Sara; Halthore, Rangasay

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The BOREAS RSS-3 team collected and processed helicopter-based measurements of atmospheric conditions to estimates of aerosol optical thickness and atmospheric water vapor. The automatic sun-tracking photometer for helicopters was deployed during all three 1994 IFCs at numerous tower and auxiliary sites in both the NSA and the SSA. Six spectral channels (440, 540, 613, 670, 870, and 1030 nm) were chosen to span the visible and NIR wavelengths and to avoid gaseous absorption. One additional...

Topics: SPACEBORNE EXPERIMENTS, OPTIMAL CONTROL, DATA TRANSMISSION, DYNAMIC RESPONSE, VIBRATION ISOLATORS,...

385
385

Jul 6, 2010
07/10

by
Okda, J

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To express the noise reducing effect of a muffler in terms of the difference in the sound power levels radiated from the tailpipe exit with and without the muffler in the system, equations are deduced by means of the four-terminal constants (A B C D) of the equivalent electrical network of the whole muffler system. Measured curves are in good agreement with those obtained by graphical methods so far as the sound wave in the chamber can be regarded as a plane wave. In the higher frequency range...

Topics: HARMONIC MOTION, HUMAN REACTIONS, OPERATOR PERFORMANCE, RANDOM VIBRATION, DYNAMIC RESPONSE, MAN...

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241

May 23, 2011
05/11

by
Garg, A.; Noebe, R. D.; Darolia, R

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Small additions of Hf to conventionally processed NiAl single crystals result in the precipitation of a high density of cuboidal G-phase along with a newly identified silicide phase. Both of these phases form in the presence of Si which is not an intentional alloying addition but is a contaminant resulting from contact with the ceramic shell molds during directional solidification of the single-crystal ingots. The morphology, crystal structure and Orientation Relationship (OR) of the silicide...

Topics: MAGNETIC FIELD RECONNECTION, BUBBLES, SOLAR MAGNETIC FIELD, FIELD ALIGNED CURRENTS, MAGNETIC FIELD...

Laboratory testing of helicopter system identification by single- point excitation showed correlation among the parameters identified by free-body shaking at two different points and theoretically derived parameters of the test specimen. Among the parameters investigated were the mass and stiffness matrices of five- and six-degree-of-freedom models and the structural damping coefficient of a continuous specimen. Experimentation demonstrated the identification of mathematical models having more...

Topics: DTIC Archive, Flannelly, W G, KAMAN AEROSPACE CORP BLOOMFIELD CT, *DYNAMIC RESPONSE, *HELICOPTERS,...

An analytical and experimental program was conducted to develop acoustic fatigue design criteria for aircraft structures subjected to intense noise in a high temperature environment. Equations for the dynamic response of a buckled panel were formulated for simply supported boundary conditions using large deflection plate theory. Random amplitude acoustic fatigue testing of representative aircraft structure was accomplished at temperatures up to 600 F to provide data for correlation with the...

Topics: DTIC Archive, Schneider, Cecil W, LOCKHEED-GEORGIA CO MARIETTA, *AIRFRAMES, *THERMAL FATIGUE,...

Flexible approach walls are being considered for retrofits, replacements, or upgrades to Corps lock structures that have exceeded their economic lifetime. This report discusses a new engineering software tool to be used in the design or evaluation of flexible approach walls founded on clustered pile groups and subjected to barge train impact events.This software tool, Impact_Deck, is used to perform a dynamic, time-domain analysis of three different types of pile-founded flexible approach...

Topics: DTIC Archive, White,Barry C, Information Technology Laboratory, U.S. Army Engineer Research and...

This report summarizes initial investigations of wave impact load transfer through passive shock mitigation seats used in high-speed planing craft. Data recorded during seakeeping trials are used to illustrate methods for developing transfer functions that characterize shock mitigation seats, and the dynamic response of compliant seat cushions is explained using data from multiple sources. This is part of a broader study of the transfer of wave impact load from the keel up through the craft...

Topics: DTIC Archive, Riley,Michael R, Naval Surface Warfare Center carderock Division Virginia Beach...

This report documents a NASTRAN finite element model of the AH-1G helicopter airframe. The model was developed for the purpose of representing the low frequency vibration response of the airframe and the structure deflections due to weapon firing. The NASTRAN input data deck for the model is included in the documentation as well as a Normal Modes run on Level 15.1 of the program. The documentation is aimed at assuring that the government can independently use and modify the model to reflect...

Topics: DTIC Archive, Cronkhite, James D, BELL HELICOPTER TEXTRON INC FORT WORTH TX, *AIRFRAMES,...

This report documents a NASTRAN finite element model of the AH-1G helicopter airframe. The model was developed for the purpose of representing the low frequency vibration response of the airframe and the structure deflections due to weapon firing. The nastran input data deck for the model is included in the documentation as well as a Normal Modes run on Level 15.1 of the program. The documentation consists mainly of drawings and sketches of the idealized NASTRAN model with supporting...

Topics: DTIC Archive, Cronkhite, James D, BELL HELICOPTER TEXTRON INC FORT WORTH TX, *AIRFRAMES,...

A recently developed multiple input power spectral technique is applied to predict the response of a C-5A aircraft to three-dimensional turbulence. Results are compared to the equivalent one-dimensional turbulence analysis, using corresponding C-5A dynamic response test data as a reference. Load variations range from an increase of 3% to a decrease of 14%. Because the coherence properties of the turbulence field are fully accounted for in the 3-d gust response analysis, theoretical results...

Topics: DTIC Archive, Eichenbaum, Frederick D, LOCKHEED-GEORGIA CO MARIETTA, *DYNAMIC RESPONSE, *GUST...

The technical note, which refers to the discussion and notation of the two previous technical notes, outlines the use of the same data to test the reasonableness of proposed head/neck models.

Topics: DTIC Archive, Smith, Dennis E, DESMATICS INC STATE COLLEGE PA, *BIOMECHANICS, *DYNAMIC RESPONSE,...

This report concerns buffeting and stability and control problems experienced by combat aircraft in transonic maneuvering flight. It addresses the problems from the operational pilot's viewpoint and discusses human physiological aspects, man's performance in the environment, basic aerodynamic phenomena, aerodynamic-structural coupling dynamics, stability and control, aircraft deisgn considerations, and engineering analysis and test techniques. Recommendations for future combat aircraft design...

Topics: DTIC Archive, ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE),...

Results of calculations are presented to predict effects of earth penetration experiments conducted in mid-July 1974 at the Watching Hill site of the Defense Research Establishment, Alberta. Calculations were perfored with the TOODY Lagrangian code for both a rigid and deformable projectile. Soil cap models describing four layers of the glacial silt target were employed in the calculations. All calculations are for a projectile 0.1651 m in diameter (6.5 in.), of mass 181.44 kg (400 lbs.) with...

Topics: DTIC Archive, Byers, R. K., Chabai, A. J., Walsh, R. T., SANDIA NATIONAL LABS ALBUQUERQUE NM,...

Characteristics of powered lift STOL airplanes that lead to unacceptable flight path control for approach and landing are identified. Most of the findings are based on the results of a piloted ground based simulator program. However, a short variable stability flight test program was conducted to allow interpretation of the simulation landing results in light of a flight environment. This report (Volume I) contains a comprehensive summary of the overall program including all of the significant...

Topics: DTIC Archive, Hoh, Roger H, Craig, Samuel J, Ashkenas, Irving L, SYSTEMS TECHNOLOGY INC HAWTHORNE...

A hybrid finite element numerical model was used to calculate harbor response for three alternate geometrical plans and two water depths for the Pier J completion and tanker terminal project of Long Beach Harbor. The numerical model calculates harbor oscillation for harbors of arbitrary shape and variable depth. Three finite element grids which covered areas only in the immediate vicinity of the breakwater-protected tanker terminal area were used to calculate the response of this area to...

Topics: DTIC Archive, Houston,James R, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS,...

This report describes the behaviour of structures under internal resonance conditions. Completion of the analysis on the three mode interaction case yields the variational equations describing the slowly varying amplitudes and phases of each mode. Computer simulation (C.S.M.P.) of these equations has been carried out. Both parametric and nonlinear terms are found to be of importance in the response of the structure. Further experimental work on the original four mode model, where parametric...

Topics: DTIC Archive, Barr,A D S, Ashworth,R P, DUNDEE UNIV (SCOTLAND) DEPT OF MECHANICAL ENGINEERING,...

This report presents the results of a study to develop a dynamic model of the vulnerability of an aircraft fuel system to the threats posed by hostile weapons. A Monte Carlo model was developed to calculate the probability of hit along segments of a specified flight profile at each point where a specified weapon system could pose a threat to the fuel system. An Air Force developed computer model (Well-Stirred Fuel Tank Model) is used to compute fuel state in each fuel tank under study at...

Topics: DTIC Archive, Dloogatch, M. A., Doane, W. R., Hewett, P. C., KEARNEY (A T) INC CHICAGO IL...

A theoretical model for predicting the dynamic behavior of a floating breakwater is presented along with a report on a field experiment designed to provide basic data for verifying the model. Additional data were taken from the literature and from auxiliary laboratory experiments. The dynamic behavior characteristics investigated were: (1) Total transmitted and reflected waves and their components; (2) wave forces on the breakwater; (3) motions of the breakwater; and (4) forces on the mooring...

Topics: DTIC Archive, Adee,Bruce H, Richey,Eugene P, Christensen,Derald R, WASHINGTON UNIV SEATTLE OCEAN...

Fifty tests were conducted with two vehicles, an XM410E1, 8x8, 2-1/2- ton cargo truck and the MEXA 10x10, 2-1/2-ton, wheeled, articulated test bed. The vertical obstacle test course at WES, on which rigid, single or multiple obstacles of various heights and shapes can be tested, was used. The primary purpose of these tests was to obtain data to relate obstacle height, vehicle speed, and vertical acceleration (at selected locations on the vehicle) for use as input to the AMC-71 cross-country...

Topics: DTIC Archive, Murphy, Jr , N R, Rula, A A, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS,...

Partial contents: Dynamic Earthquake Analysis of a Bottom Supported Industrial Boiler; Dynamic Response of Laminated Composite Shells; Spectrum and RMS Levels for Stresses in Closely Spaced Stiffened Cylindrical Shells, Subjected to Acoustic Excitation; Analysis of Space Frameworks Containing Curved Beams; Vibrations in Construction Equipment; Model of Soil-Vibrating Machine; General Purpose Computer Graphics Display System for Finite Element Modes; Vibration Characteristics of 1/8-Scale...

Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC SHOCK AND VIBRATION INFORMATION CENTER,...

Derivation of the linear, small-perturbation equations of motion for underwater vehicles is presented. These equations include the inertial, hydrodynamic, and gravity-buoyancy forces and moments. Necessary assumptions are introduced to linearize the equations and decouple the longitudinal from the lateral motions. Solutions to the equations are obtained by Laplace transform techniques. Complete expressions for the transfer functions are given in terms of the hydrodynamic coefficients. An...

Topics: DTIC Archive, Humphreys,D E, NAVAL COASTAL SYSTEMS LAB PANAMA CITY FLA, *TRANSFER FUNCTIONS,...

The dynamic response of deepwater flexible platforms due to wind-generated ocean waves appears to be an important design consideration; therefore, a theoretical and experimental study was made of hydrodynamic damping and 'added mass.' Classical potential theory with linearized boundary conditions was used to study the hydrodynamic damping due to wavemaking and the coefficient of added mass on a vertical surface-piercing cylinder as a function of oscillation frequency, cylinder diameter, water...

Topics: DTIC Archive, Petrauskas,Charles, CALIFORNIA UNIV BERKELEY HYDRAULIC ENGINEERING LAB, *OFFSHORE...

An analytical model for predicting the pitch and heave response of air-cushion-supported vehicles (ACV) during overland operation is developed. The effects of air compressibility and skirt contact with the supporting surface are included in the model. The resulting analytical model is used to predict the response of a JEFF (B) experimental model to periodically varying terrain. These predictions show excellent correlation with experimental model data, thereby serving as verification of the...

Topics: DTIC Archive, Moran,David D, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD...

Contents: Shock testing and analysis; Fluid structure topics; Acoustic and vibration testing; Imapct and blast; Measurement and criteria development; Isolation and damping; Dynamic analysis; Minuteman dynamics; Modal test and analysis; Shipboard problems and blast effects.

Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON D C SHOCK AND VIBRATION INFORMATION CENTER, *VIBRATION,...

The dynamic structure of simple polyatomic molecular fluids such as CF4, SF6, CFCl3, C4F8, FC6D5, has been studied by nuclear magnetic resonance relaxation techniques. The effects of temperature and pressure on the transport and relaxation behavior of fluids in the supercritical dense fluid region have been investigated. These systematic studies led to the main conclusions of some of the general character: 1, Validity of the rough hard sphere model of liquids to describe transport and...

Topics: DTIC Archive, Jonas, Jiri, ILLINOIS UNIV AT URBANA DEPT OF CHEMISTRY, *DENSE GASES, *MOLECULAR...

A finite-element structural model has been developed for the dynamic analysis of laminated, thick plates. The model uses constant thickness quadrilateral elements to represent the shape of the plate and these elements are stacked in the thickness direction to represent the desired material layers. The analysis allows for orthotropic material properties of each layer as well as for elastic-plastic material response. Nonlinear strain displacement relations are used in the formulation to represent...

Topics: DTIC Archive, Zak, A. R., ILLINOIS UNIV AT URBANA DEPT OF AERONAUTICAL AND ASTRONAUTICAL...

Structures designed as venting enclosures have been proposed to contain and suppress the explosions resulting from the accidental detonation of explosives during their manufacture, handling, and storage. These structures must provide total containment of fragments, partial suppression of the shock wave, and a controlled release of the internal quasi-static pressure. Because of the relatively low frequency of accidental detonations, the most cost effective approach to the design of such...

Topics: DTIC Archive, Kushner, A. S., NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD,...

An 8000 psi hydraulic lateral control system was installed in a T-2C airplane. Four pilots evaluated the test installation, accumulating 11.5 flight hours. Operational characteristics were very similar to the original 3000 psi system. The 8000 psi installation functioned exceptionally well. Successful completion of this project confirmed that 8000 psi lightweight hydraulic systems can be designed, fabricated, and maintained without special techniques or state-of-the-art advances. (Author)

Topics: DTIC Archive, Demarchi,Joseph N, ROCKWELL INTERNATIONAL COLUMBUS OHIO COLUMBUS AIRCRAFT DIV,...

Measured input-output data for the neck are required to determine absolute tolerance limits to indirect impact acceleration. Considerable data are available as to vehicular output in crash situations. However, very little directly measured data concerning input to the man's neck are available. Determination of absolute tolerance limits is necessary but probably will not be completed for several years. Tolerance limits of the human neck to direct impact are unavailable.

Topics: DTIC Archive, Ewing, Channing L., NAVAL AEROSPACE MEDICAL RESEARCH LAB DETACHMENT MICHOUD NEW...

This is an initial study and analysis of a method for testing the pressure/seismic response of a MILES transducer. The testing approach described is based on an experimentally verified mathematical model for the line transducer. A preliminary design for a test apparatus and a test procedure not only evaluates the pressure/seismic response, but also develops all additional data required for acceptance testing of a MILES transducer. (Author)

Topics: DTIC Archive, Starr,J B, HONEYWELL INC HOPKINS MINN DEFENSE SYSTEMS DIV, *PRESSURE TRANSDUCERS,...

A twelve degree of freedom model for a missile suspension system was simulated mathematically. The derived equations of motion were solved for missile accelerations and displacements at various driving forces, frequencies, and damping coefficients. The simulation results were validated using measured field data. (Author)

Topics: DTIC Archive, Hartnett,Eugene B, BOSTON COLL CHESTNUT HILL MASS, *MATHEMATICAL MODELS, *SUSPENSION...

The Meeting dealt with the philosophy and approach on the use of active controls to realize structural improvements. The question of what constitutes a good balance of effort to achieve a successful active control system was posed. Specifics dealt with the techniques for evaluating the system transfer function, with the relative roles of ground vibration testing, bench testing of component parts and the merits of open and closed loop testing. The question of what is an appropriate index of...

Topics: DTIC Archive, ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT PARIS (FRANCE), *FLIGHT CONTROL...

The dynamic stall of an airfoil with leading edge bubble separation is analyzed. The stall flutter of turbomachine blading often involves periodic growth and collapse of such a bubble. The mathematical model representing the physical problem is presented. A flat plate undergoing harmonic oscillations with time dependent point of re-attachment is studied for the perturbed aerodynamic reactions and applications to the stall flutter problem. (Author)

Topics: DTIC Archive, Sisto,F, STEVENS INST OF TECH HOBOKEN N J DEPT OF MECHANICAL ENGINEERING,...

A summary is given of the trade routes of U.S. ships, followed by suggestions for new projects and extension and improvement of current projects to meet the need for additional data on sea conditions encountered by U.S. ships. It is concluded that the greatest benefit can be obtained by making a direct effort to obtain wave spectra for the ocean areas on important sea routes that are known to experience severe sea conditions, probably by the use of moored buoys, and by further verification and...

Topics: DTIC Archive, Hoffman,Dan, WEBB INST OF NAVAL ARCHITECTURE GLEN COVE N Y, *OCEAN WAVES, *SHIP...

This report presents a procedure for nondestructively evaluating and predicting the deflection response of various flexible pavements to loads imposed by different aircraft. Transfer function theory is used to form the basis of a pavement evaluation and response scheme. Two mobile systems were developed for the measurement of pavement deflections; the Light Emitting Diode (LED) system and the Linear Variable Differential Transformer (LVDT) system. The report concludes that the rapid...

Topics: DTIC Archive, Harr,M E, PURDUE RESEARCH FOUNDATION LAFAYETTE IN, *PAVEMENTS, *RUNWAYS, MATHEMATICAL...

This report presents the results of a snap-back analysis of the VIPER warhead. A description of the approach used to model this event is presented. (Author)

Topics: DTIC Archive, Patrick ,G E, ARMY MISSILE RESEARCH AND DEVELOPMENT COMMAND REDSTONE ARSENAL ALA...

A mathematical model is presented for prediction of linear elastodynamic response of metal matrix composite penetrators. Although it is recognized that for the applications envisaged, the anelastic effects are the dominant ones, a study of linear elastic behavior is of importance inasmuch as it yields information about the composite properties required for simulation, using, for example, the HELP code where material strength is not neglected.

Topics: DTIC Archive, Maewal,Akhilesh, SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CALIF, *STRESS ANALYSIS,...

The transient response of a system of two concentric spherical elastic shells coupled by an ideal fluid and impinged by an incident plan pressure pulse is analyzed. The classical techniques of separation of variables and Laplace transforms are employed for solving the wave equations governing the fluid motions and the shell equations of motion. A scheme of iterative convolution was devised for the inversion of the Laplace transforms that facilitates the calculation of accurate transient...

Topics: DTIC Archive, Huang,H, NAVAL RESEARCH LAB WASHINGTON D C, *TRANSIENTS, *PULSES, *PRESSURE, *ELASTIC...

This paper presents a hybrid algorithm for multi-stage linear programs arising from time-phased or dynamic models. The hybrid computation is based on a nested decomposition algorithm and the revised simplex method. Initial computational experience is reported. (Author)

Topics: DTIC Archive, Ho,James K, STANFORD UNIV CALIF SYSTEMS OPTIMIZATION LAB, *ALGORITHMS, *LINEAR...

A method is developed for estimating the parameters of linear transfer functions describing a multi-input multi-output dynamic system from noisy flight test data. The method is demonstrated on real and synthetically generated underwater vehicle data. (Author)

Topics: DTIC Archive, Jain,V K, UNIVERSITY OF SOUTH FLORIDA TAMPA COLL OF ENGINEERING, *TRANSFER FUNCTIONS,...

This report summarizes procedures for calculating the maximum tidal inlet channel velocity during a tidal cycle as well as the bay tidal range and phase lag (published by King, 1974). Guidance for the application of these procedures to solve tidal inlet design problems for jettied inlets is also presented. The procedures may be applied to some unjettied inlets. A procedure is described whereby the inlet hydraulic response calculations can be combined with the appropriate tidal prism-inlet area...

Topics: DTIC Archive, Sorensen,Robert M, COASTAL ENGINEERING RESEARCH CENTER FORT BELVOIR VA, *TIDAL...

A method for the analysis of submerged vehicle dynamics is described. It enables the test engineer to identify the transfer function parameters from actual flight-test data (for post-flight analysis), or from simulated trajectories (for designing tow-test maneuvers), via the computer program GRAM. The method is noniterative and yields reliable estimates in the presence of disturbances and instrumentation noise. (Author)

Topics: DTIC Archive, Jain,V K, UNIVERSITY OF SOUTH FLORIDA TAMPA, *COMPUTER PROGRAMS, *UNDERWATER...

This report discusses the development of a simple numerical model for the prediction of coastal inlet velocities, discharge, and resulting bay level fluctuations. The model is a time-marching model that simultaneously solves the area-averaged momentum equation for the inlet and the continuity equation for the bay. It is assumed that the bay surface elevation remains horizontal as it rises and falls. At each time step the geometric and hydraulic factors describing the inlet-bay system are...

Topics: DTIC Archive, Seelig,William N, COASTAL ENGINEERING RESEARCH CENTER FORT BELVOIR VA, *OCEAN WAVES,...

This thesis is concerned with the dynamic response of off-shore concrete gravity structures to the loading imposed by random ocean waves in deep water. The purpose and scope is to study previous, present, and future platforms for a general understanding of what has been developed and why. An attempt to model a hypothetical structure with specific dimensions and parameters representative of the present offshore construction industry is then made using a computer program. The model is a hollow,...

Topics: DTIC Archive, Duvall,William Emmert, MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CIVIL...

The feasibility of a discrete digital flight controller for the YF-16 Lightweight Fighter Prototype aircraft at Mach .8 at sea level is investigated. The investigation is limited to the longitudinal pitch axis. A reduced state, short period mathematical model of the YF-16 is developed from available data. The open loop stability and response characteristics of the model are shown to be unacceptable, necessitating the use of closed loop compensation. The minimization of a discrete cost function...

Topics: DTIC Archive, Monico,Paul D, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF...

A method has been developed for determining the dynamic response of a flexible aircraft to runway roughness during takeoff or constant speed taxi. The equations that formulate the mathematical model have been programmed for a CDC 6600 digital computer and uses a Calcomp plotter for part of the program output. Three sets of runway elevation data are input to provide a forcing function at each landing gear. Three runway profiles measured at Washington National Airport, runway 36, were used to...

Topics: DTIC Archive, Gerardi, Anthony G., AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH,...

The major objective of this study was to investigate the effects of axial stiffening of cylindrical shells subject to transverse blast loadings. Two existing methods for predicting dynamic response of cylindrical shells were modified to include axial stiffening. A semi-analytical energy method was chosen as a first cut design predictor and tables of normalized deflection versus external energy imparted to the structure are presented. In addition a more detailed analytical energy method was...

Topics: DTIC Archive, Ross,C A, FLORIDA UNIV EGLIN AFB GRADUATE ENGINEERING CENTER, *DYNAMIC RESPONSE,...