| Fundamental Studies of Turbulent Wall Pressure Fluctuations with Applications to Advanced Acoustic Sensor Systems |
15 JUL 89 |
6 pages |
| Authors:
Patrick Leehey; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
|
 | Summarizes the work done under the Hydroacoustic Special Research Opportunity (SRO) in computation of turbulent boundary layer wall pressure fluctuations, analyses of boundary layer flow noise and receptivity to sound, measurements of wall pressure fluctuations and computations of structural response. (rrh) |
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| Acceleration Measurements on Naval Vessels Undergoing Explosive Shock Testing |
JUN 89 |
|
| Authors:
G. Yiannakopoulos; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
|
 | In shock testing a naval vessel many accelerometers, may be located on board the vessel to measure its response from the underwater blast wave. Accelerometers are positioned on the structure at locations such as the outer hull plating, bulkheads and superstructure. Other locations include ship's equipment such as the power plant, control systems and electronic instrumentation. It is a difficult task to identify suitable locations for measurements because of the ... |
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| The Effects of Simulated Space Environmental Parameters on Six Commercially Available Composite Materials |
APR 89 |
35 pages |
| Authors:
Jean G. Funk; George F. Sykes Jr; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The effects of simulated space environmental parameters on microdamage induced by the environment in a series of commercially available graphite fiber reinforced composite materials were determined. Composites with both thermoset and thermoplastic resin systems were studied. Low-Earth-orbit (LEO) exposures were simulated by thermal cycling; geosynchronous orbit (GEO) exposures were simulated by electron irradiation plus thermal cycling. The thermal cycling temperature range was -250 deg F to either 200 deg F ... |
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| Numerical Solution of Acoustic-Structure Interaction Problems |
APR 89 |
35 pages |
| Authors:
H. A. Schenck; G. W. Benthien; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
|
| The purpose of this report is to describe a technique for solving steady state coupled structure-acoustics problems that has been implemented by the transducer modeling group at the NOSC. This technique is applicable to both structural radiation problems and structural scattering problems. The structural portion of the problem is modeled using a standard finite element program. The particular program used at NOSC is MARTSAM, but virtually any general finite element ... |
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| Structure Inventory for Damage Analysis (SID). User's Manual |
MAR 89 |
204 pages |
| Authors:
HYDROLOGIC ENGINEERING CENTER DAVIS CA
|
| The Structure Inventory for Damage Analysis computer program (SID) is designed to assist in the systematic and expeditious collection, management, and processing of data related to structures subject to flooding. The primary function of the program is to generate elevation-damage functions by user- designated damage categories and reaches. The resulting functions may be exposed to additional processing, such as the expected annual damage evaluations provided by the Expected Annual Flood ... |
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| Working Group on Ice Forces (4th) State-of-the-Art Report Held in Iowa City, Iowa in 1986 |
FEB 89 |
|
| Authors:
G. W. Timco; INTERNATIONAL ASSOCIATION FOR HYDRAULIC RESEARCH WORKING GROUP ON ICE FORCES
|
| This report on ice forces on structures includes 13 individual papers covering topics of local ice pressures, large-scale ice pressures, large-scale ice loads and failure modes, damage modes for ice, ice forces on compliant structures and conical-shaped structures, ice rubble, spray ice and ice loads on icebreaking vessels. Researchers and design engineers should find the report useful and informative in all of these areas. The papers were written with senior ... |
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| Issues Related to the Selection of U.S. Navy Buildings for Base Isolation |
JAN 89 |
91 pages |
| Authors:
Gary C. Hart; CALIFORNIA UNIV LOS ANGELES DEPT OF CIVIL ENGINEERING
|
| Major structural engineering advances in the area of earthquake engineering have taken place with increased frequency since the 1971 San Fernando earthquake. Advances include: (1) Steel detailing for reinforced concrete buildings, (2) Ductile design criteria for reinforced masonry shear walls and, (3) Eccentric bracing of steel frames. One major advance has been the introduction of shock isolation concepts into building design and this advance is commonly referred to as Base ... |
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| Recent Advances in Impact Dynamics of Engineering Structures - 1989 |
89 |
8 pages |
| Authors:
D. Hui; N. Jones; KENTUCKY UNIV LEXINGTON DEPT OF MATERIALS AND SCIENCE ENGINEERING
|
|
| Response of Low-Rise Frame Structures to Dynamic Soil Motions |
89 |
273 pages |
| Authors:
John E. Higgins Jr; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The major objective of this thesis was to develop a simplified model to simulate the response of low-rise structures subjected to dynamic loads. The model incorporates the influence of soil and floor flexibility and is based upon underlying assumptions of static portal frame analysis. The study was extended to incorporate mono-symmetric structures (with and without setback) subject to self-induced torsion, as well as asymmetric frames. This model provides estimates of ... |
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| Shock and Vibration Symposium (59th) Held in Albuquerque, New Mexico on 18-20 October 1988. Volume 4 |
DEC 88 |
292 pages |
| Authors:
SANDIA NATIONAL LABS ALBUQUERQUE NM
|
| Partial contents: Validation testing of nuclear survivable systems; Vibroacoustic Payload Environment Prediction System (VAPEPS) -- Using the VAPEPS program to support TOPEX spacecraft design, Statistical energy analysis modeling of nonstructural mass on lightweight equipment panels using VAPEPS, and Stress estimation and statistical energy analysis of the Magellan spacecraft solar array using VAPEPS; Dynamic measurement -- An automated vibration transducer calibration system using advanced FFT techniques; Dynamic criteria -- Avionics environmental ... |
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| Fabrication and Application of a Standardized T1/T2 Mount |
DEC 88 |
10 pages |
| Authors:
Norman S. Gilbert; Stephen V. Mawn; Salvadore J. Guccione Jr.; Ferris E. Bolin; NAVAL BIODYNAMICS LAB NEW ORLEANS LA
|
| Human response to impact is studied at the Naval Biodynamics Laboratory (NAVBIODYNLAB) using a horizontal accelerator which propels a restrained subject in a sled along an indoor track. Similar research using a vertical accelerator will begin in the near future at the Laboratory. Experimental impact forces which affect the cervical spine and head are accurately reflected at the subject's first thoracic vertebra (T1), and consequently can be measured there. Adventitious ... |
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| Active Control of a Large Space Structure as Applied to the Phase 1 CETF (Critical Evaluation Task Force) Space Station |
DEC 88 |
117 pages |
| Authors:
Dale A. Cope; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The major objective of this thesis is to apply a decoupled control technique to a specific space station model. The model is a finite element model of the Phase 1 Critical Evaluation Task Force (CETF) Space Station. The control technique allows for the active control of a large number of modes by using several decoupled controllers. The space station attitude control system provides attitude stabilization and disturbance rejection. Its performance ... |
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| Integrity Analysis of a T-Frame Stiffened Panel with a Weld Defect. |
DEC 1988 |
27 pages |
| Authors:
V. G. DeGiorgi; P. Matic; J. Judy; M. I. Jolles; NAVAL RESEARCH LAB WASHINGTON DC
|
| Structural integrity analyses are often an essential part of the design and fabrication processes. In any structural integrity analysis, an accurate representation of component geometry and material constitutive response is required. Weld geometry and weld inhomogenity add to the complexity of a structural integrity analysis. The current work consist of a structural integrity analysis of a welded T-frame stiffened panel with a lack of penetration weld defect. Material fracture toughness ... |
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| Vibration Study of the Bloomington Intake Tower |
NOV 88 |
68 pages |
| Authors:
Vincent P. Chiarito; Timothy L. Fagerburg; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| This report presents the results of tests conducted to obtain data pertaining to the hydraulic performance and structural response of the intake tower. These data would then be used to compare with findings of earlier measurements and evaluate correlations between the hydraulics and the structural responses. The test program measured wet well transition zone pressures, upper portal pressures wet well water-surface levels, and structural vibrations. Data reduction and analysis indicated ... |
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| Compensating Gravity Effects in 1-G Small-Scale Structural Modeling |
OCT 88 |
78 pages |
| Authors:
W. T. Lu; G. Martin; EARTH TECHNOLOGY CORP LONG BEACH CA
|
| This report presents the results of a study to develop viable concepts to compensate for the gravity effects in 1-g small-scale tests. These tests simulate the effects of nonnuclear weapons on protective structures. Two viable concepts associated material preparation procedures were developed on the basis of theoretical and experimental evidence governing equations, similarity requirements, and known material behavior. Although Phase II work is necessary to demonstrate the viability of the ... |
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| Shock and Vibration Symposium (59th) Held in Albuquerque, New Mexico on 18-20 October 1988. Volume 3 |
OCT 88 |
332 pages |
| Authors:
SANDIA NATIONAL LABS ALBUQUERQUE NM
|
| Partial contents: Machinery vibration -- Mechanical signature analysis, High frequency vibration analysis for rotating equipment and piping systems, Diagnosing problems in modern 2-pole induction motors, Absolute ball bearing wear measurements from SSME turbopump dynamic signals; Spectral normalizing, and Kinematics of a flexible length redundant robotic arm; Vibration control -- Optimization of a five-parameter nonlinear shock mount, Active damping design of flexible structures based on non collocated sensor- actuator velocity feedback, ... |
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| Strategies for Nonlinear Analysis of Marine Structures |
AUG 88 |
226 pages |
| Authors:
Subrata K. Chakrabarti; CBI RESEARCH CORP PLAINFIELD IL
|
| This report extensively reviews the state of the art of available and emerging techniques for determining extreme responses of nonlinear marine structures and systems. The contents may be categorized into two parts. The first presents the nonlinear characteristics of wave induced forces and corresponding structural responses. The other discusses the extreme value analysis of nonlinear systems relevant to offshore and marine structural design. Generic procedures for the nonlinear analysis of ... |
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| Minehunter Inshore Shock Trials. Phase 2. A Limited Shock Trial for Developing Trial Methodology and Logistics |
AUG 88 |
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| Authors:
D. J. Hatt; P. P. Elischer; G. Campanella; M. G. Wolfson; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
|
| Phase 2 of the Australian inshore minehunter shock trials was conducted in the ocean off the coast from Townsville during September - October, 1986. The trial was the second in a three-phase programme which ended with the first-of-class shock testing of the Royal Australian Navy's prototype glass reinforced plastic (GRP) minehunter catamaran during the November-December, 1987. Described in the report are the operations undertaken during the trial. The operations were ... |
|
| Minutes of the Explosives Safety Seminar (23rd) Held at Atlanta, Georgia on 9-11 August 1988. Volume 2 |
AUG 88 |
1195 pages |
| Authors:
DEPARTMENT OF DEFENSE EXPLOSIVES SAFETY BOARD ALEXANDRIA VA
|
| Partial Contents: Hazards and Risks of the Disposal of Chemical Munitions Using a Cryogenic Process; Special Equipment for Demilitarization of Lethal Chemical Agent Filled Munitions; Explosive Containment Room (ECR) Repair Johnston Atoll Chemical Agent Disposal System; Sympathetic Detonation Testing; Blast Loads - External/Internal; Structural Response Tests - Walls/Doors/Valves; Underground Explosion Effects - External Airblast; Explosives Shipping - Transportation Safety and Port Licensing; Explosives Safety Management; Underground Explosion Effects - Model ... |
|
| A Pressuremeter Method for Single Piles Subjected to Cyclic Lateral Loads in Sand |
JUN 88 |
334 pages |
| Authors:
Robert L. Little; Jean-Louis Briaud; TEXAS A AND M UNIV COLLEGE STATION DEPT OF CIVIL ENGINEERING
|
| A method is proposed to predict the response of piles in sand subjected to cyclic horizontal loading on the basis of cyclic pressuremeter tests. This method is an extension of the pressuremeter method proposed for piles subjected to monotonic horizontal loading. The pressuremeter-derived monotonic P-y curve is reduced by a multiplier 1/N(to the a power) to obtain the cyclic P/N(to the a power)-y curve. The parameter a is obtained readily ... |
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| The Flight of Flexible Aircraft in Turbulence. State-of-the-Art in the Description and Modelling of Atmospheric Turbulence. Addendum |
JUN 1988 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE)
|
| Large-scale use of flight recorders by commercial airlines, coupled with the enhanced quality of results offered by modern computer-based reduction processes makes it possible to broaden knowledge of the phenomenon of atmospheric turbulence. At the same time, new methods for predicting the response of flexible aircraft to turbulence are being proposed, and novel gust alleviation systems are being designed and tested. The Structures and Materials Panel held two Workshops on ... |
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| Nearfield Acoustic Radiation from a Point-Excited Cylindrical Shell |
26 MAY 88 |
223 pages |
| Authors:
Richard D. Vogelsong; NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT NEW LONDON LAB
|
| The surface force exerted by a dense medium such as water upon an elastic structure undergoing dynamic motion is often comparable to the inertial and damping forces found within the structure. Fluid loading may alter the structural response by strongly coupling the elastic and acoustic media. Any attempt to locally deform the structure may lead to a slowly decaying pressure field that excites the elastic structure further away. In this ... |
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| Continuous Deformation Monitoring with GPS |
12 APR 88 |
39 pages |
| Authors:
Stephen R. DeLoach; ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA
|
| The US Army Corps of Engineers makes extensive use of modern instrumentation for measuring the behavior of large structures. One of these instrumentation programs is high precision geodetic surveying which provides a reliable measure of displacement as a function of time. Typically, accuracies of 5-10 mm can be achieved. Final accuracy of the displacement is a function of many factors, including: network geometry, field procedures, survey crew experience, and equipment. ... |
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| Report on Visit to IFIP (International Federation of Information Processing) Conference, Aalborg, May 1987, ICASP5 (International Conference on Applications of Statistics and Probability 5) and Six Fatigue Laboratories |
APR 88 |
45 pages |
| Authors:
D. G. Ford; AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
|
| During May 1987 the author presented a paper on Range-Pair Exceedances in Stationary Gaussian Processes to the First IFIP Conference on Reliability and Optimisation of Structural Systems. This memo describes this Conference, the better known ICASP5 and discussions at six establishments visited during the same trip. Keywords: Gaussian processes, Fracture mechanics, Crack propagation, Visit reports, Metal fatigue life, Damage tolerance, Structural response, Australia. (EDC) |
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| Computer-Aided Structural Engineering (CASE) Project. Computer Program for Analysis of Planar Grid Structures (CGRID)(User's Guide) |
APR 88 |
|
| Authors:
William P. Dawkins; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS INFORMATION TECHNOLOG Y LAB
|
| The computer program CGRID, described in this user's guide, performs an analysis of planar grid structures using conventional matrix analysis techniques based on the assumptions of linearly elastic structural response to infinitesimally small displacements. The program is limited to structures with no more than 100 joints and 180 members. All members are assumed to be prismatic possessing straight centroidal axes and composed of a linearly elastic, homogeneous material. Output consists ... |
|
| ISST (Intercontinental Ballistic Missile Silo Superhardening Technology) Structure with SIFCON (Slurry-Infiltrated Fiber Concrete) - HFC-2 Test |
APR 88 |
380 pages |
| Authors:
Bruce Schneider; Ray Mondragon; Jon Kirst; Jerry Berglund; NEW MEXICO ENGINEERING RESEARCH INST ALBUQUERQUE
|
| In 1983 a new material, slurry-infiltrated fiber concrete (SIFCON), was brought to the attention of the Air Force Weapons Laboratory (AFWL) by Dr David Lankard of the Lankard Materials Laboratory (LML) in Columbus, Ohio. A review of both high strength as well as ductility. These properties indicated that the material had a potential use in a superhard silo structure. Because the material showed such promise, AFWL proposed a program to ... |
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| Behavior of Sand/Concrete Interfaces under Dynamic Loads |
APR 88 |
|
| Authors:
Robert L. Bigelis; Harold C. Sorensen; WASHINGTON STATE UNIV PULLMAN
|
| The objective of this research effort was to conduct an experimental program to determine the dynamic shear response of dry sand/concrete interfaces. A series of dynamic direct shear interface tests was performed using Yuma and McCormick Ranch sands in contact with concrete. Each concrete specimen was cast against a plywood form. These experiments were conducted using various values of normal stress, shearing velocity, and sand density. Results obtained from the ... |
|
| Computer Programs for Generation of NASTRAN and VIBRA-6 Aircraft Models |
APR 88 |
|
| Authors:
Steven G. Harrison; ANAMET LABS INC HAYWARD CA
|
| This report describes a series of computer programs designed to aid the analyst in preparing input data for aircraft models to be analyzed using NASTRAN and/or VIBRA-6. The programs permit creation of either beam or plate- type models of aircraft, subsequent postprocessing of NASTRAN OUTPUT2 files, and creation of VIBRA-6 AERO, IMOD and LOAD fixed data decks. In addition, the analyst may specify use of either the Ritz procedure or ... |
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| Vibration Test of Richard B. Russell Concrete Dam after Reservior Impoundment |
MAR 88 |
|
| Authors:
Tommy L. Bevins; Vincent P. Chiarito; Robert L. Hall; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| The recently completed Richard B. Russell Dam, is approx 170 miles from the mouth of the Savannah River. The crest of the concrete gravity dam, 1, 884 ft long, is composed of 13 nonoverflow, 8 intake, and 11 spillway monoliths, the tallest of which is approximately 200 feet high. To experimentally determine the dynamic properties of the dam with and without hydrodynamic interactions, forced vibration tests were conducted before and ... |
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| Centrifugal Modeling of Underground Structures Subjected to Blast Loading |
MAR 88 |
319 pages |
| Authors:
Habibollah Tabatabai; David Bloomquist; M. C. McVay; John J. Gill; F. C. Townsend; FLORIDA UNIV GAINESVILLE DEPT OF CIVIL ENGINEERING
|
| Reliable and economical design of survivable underground military structures requires better understanding of the complex parameters involved. Small-scale model testing of such systems offers major cost savings compared to full-scale tests. The laws of similitude and scaling relationships require some form of dead-load compensation to account properly for the effect of gravity stresses in scaled models. This can be accomplished by subject |
|
| Rate Effects in Shear for Cares-Dry Soil |
FEB 88 |
|
| Authors:
William F. Carroll; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| Thirty-six individual specimens of CARES-Dry soil were tested in the fast triaxial shear device (FTRXD) at three confining pressures and at six test velocities. The slowest were static, unconsolidated, undrained triaxial tests. The fastest (9.0 ips) were the fastest that could be obtained while maintaining constant deformation velocity. The FTRXD performed well. Load and displacement as a function of time were measured accurately. Constant velocities were achieved. Procedures developed to ... |
|
| Proceedings of the Workshop on Measurement and Analysis of Structural Response in Concrete Armor Units Held in Vicksburg, Mississippi on 23-24 January 1985 |
FEB 88 |
431 pages |
| Authors:
Gary L. Howell; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
|
| This Proceedings is the record of a workshop hosted by the Coastal Engineering Research Center, Waterways Experiment Station, of the U.S. Army Corps of Engineers, January 23-24, 1985. The objectives of the workshop was to review the current state of knowledge of the structural strength of breakwater concrete armor units and to discuss past and proposed measurements of the structural forcing and response. The invited participants represented a purposeful mix ... |
|
| Travelling Wave Concepts for the Modeling and Control of Space Structures |
31 JAN 1988 |
441 pages |
| Authors:
A. H. Von Flotow; S. R. Hall; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| This report summaries 20 months of research into Travelling Wave Concepts for the Modelling and Control of Space Structures. A good portion of the research has focused upon the development of techniques for the modelling of structural response in terms of disturbance propagation. Such models are of interest for several reasons: 1. Understanding the mechanisms that govern the propagation of disturbances through an elastic structure is useful for building intuition, ... |
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| Structural and Functional Responses to Perturbation in Aquatic Ecosystems |
25 JAN 88 |
|
| Authors:
John Cairns Jr.; James R. Pratt; B. R. Niederlehner; Nancy J. Bowers; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG CENTER FOR ENVIRONMENTAL STUDIES
|
| Naturally-derived microbial microcosms were used to evaluate general responses of aquatic communities to stress. Laboratory toxicity tests examined structural and functional responses of microbial communities to six pure compounds (chlorine, zinc, phenol, ammonia, Atrazine, and sulfuric acid), mixtures of ammonia and chlorine, and two complex effluents. In addition, field validation studies compared laboratory responses of microbial communities to effects in the receiving system. For all six pure compound studies, estimates ... |
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| An Interferometric Measurement Technique for Railgun Structures |
JAN 88 |
|
| Authors:
Alex Zielinski; Jeffrey Kezerian; Joseph Beno; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A technique to measure the expansion of a railgun under conditions of high magnetic stress has been developed. Bore deflections are detected by a Michelson interferometer arrangement during the application of a current pulse which produced repulsive forces similar to those in an actual projectile launch. This technique has been successfully used with two different barrel set-ups whose rails were electrically connected outside the bore at the muzzle. The method ... |
|
| An Examination of Helicopter Rotor Load Calculations |
88 |
20 pages |
| Authors:
Thomas H. Maier; ARMY AVIATION RESEARCH AND TECHNOLOGY ACTIVITY MOFFETT FIELD CA AEROFLIGHTDYN AMICS DIRECTORATE
|
| The structural response of three full-scale helicopter rotors has been examined. Airloads predicted by CAMRAD were compared by harmonics with test measurements. Flapwise bending moments were calculated from the CAMRAD airloads using three methods: force integration, curvature, and a finite-difference method. The force-integration and curvature moments were calculated with the CAMRAD program itself; however, the finite-difference method was calculated externally by a forced response program, Blade Response to Aerodynamic Loading ... |
|
| Conference Proceedings of the America Institute for Aeronautics and Astronautics Missile Sciences Held in Monterey, California on 29 November - 1 December 1988. Volume 10. Navy Ballistic Missile Technology |
88 |
37 pages |
| Authors:
AIR FORCE ARMAMENT LAB EGLIN AFB FL
|
| Five papers were submitted for inclusion in Volume 10: Target Non- Homogeneity and Effect on EPW Design, Analytical Estimation of Transient Structural Response of Earth Penetrating Weapons, Experimental Earth Penetrator Response Data Analysis for Applied Force Estimation, Weight Optimization of Earth Penetrating Weapons, Attacking Strategic Relocatable Targets: An Artificial Intelligence Approach, SLBM Penetration Concept Study, Strategic Missile Design in Response to A Flight Test Ban. (jes) |
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| Galvanic Corrosion Initiatives |
DEC 87 |
31 pages |
| Authors:
Dario A. Emeric; Lisa R. Whiting; Mark Burns; ARMY BELVOIR RESEARCH DEVELOPMENT AND ENGINEERING CENTER FORT BELVOIR VA
|
| In the past, there have been a number of material failures in Army equipment. Many of these failures were caused by galvanic corrosion. This research was performed to determine the effect of galvanic reactions on the mechanical properties of high strength materials in aggressive environments. Aluminum alloys, steels, and a graphite-epoxy composite were exposed to various environments, then tested to indicate whether the galvanic corrosion exposed to various environments, then ... |
|
| Dynamic Test of a Corrugated Steel Keyworker Blast Shelter Misty Picture |
NOV 87 |
93 pages |
| Authors:
Randy L. Holmes; Thomas R. Slawson; Aaron L. Harris; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| The 18-man blast shelter was tested dynamically on May 14, 1987 in the MISTY PICTURE event at White Sands Missile Range, NM. The main section of the shelter was fabricated from a 9-foot-diameter, 27.5-foot-long section of 10- gage, galvanized, corrugated steel culvert. The shelter included a vertical entryway and air intake and exhaust stacks. The shelter design was found to be conservative during a previous 50-psi validation test, and some ... |
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| Feedback Control of Distributed Parameter Systems with Applications to Large Space Structures |
15 OCT 1987 |
26 pages |
| Authors:
Mark J. Balas; DEPARTMENT OF THE AIR FORCE WASHINGTON DC DIRECTORATE OF STUDIES AND ANALYSIS
|
| Large space structures exhibit distributed parameter behavior in their dynamics and thus must be described on infinite-dimensional state-spaces. However, the controller algorithm must be finite-dimensional to be implemented. The focus of this research has been to make finite-dimensional approximations of infinite-dimensional controllers which stabilize the distributed parameter system. The investigator has shown conditions under which Galerkin approximation schemes can yield finite-dimensional stabilizing controllers for linear distributed parameter systems. |
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| Strain Rate Effects for Concrete and Fiber Reinforced Concrete Subjected to Impact Loading |
OCT 1987 |
83 pages |
| Authors:
Surendra P. Shah; NORTHWESTERN UNIV EVANSTON IL CENTER FOR CONCRETE AND GEOMATERIALS
|
| Despite it's extensive use, low tensile strength has been recognized as one of the major drawbacks of concrete. Although one has learned to avoid exposing concrete structures to adverse static tensile loads, these structures cannot be shielded from short duration dynamic tensile loads. Such loads originate from sources such as impact from missiles and projectiles, wind gusts, earthquakes and machine vibrations. In addition, modern computer-aided analysis and use of concrete ... |
|
| Buckling of Blast Loaded Cylinder |
OCT 87 |
52 pages |
| Authors:
Joseph M. Santiago; Michael H. Klaus; Henry L. Wisniewski; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The transient response of a thin-walled aluminum cylinder subjected to an enveloping shock wave has been simulated with the ADINA finite element program and the results have been compared with counterpart experimental data. The analysis employed the ADINA 16-noded rectangular curved shell. Using linear analysis, the computed strain histories at gage locations were found to correlate reasonably well with test records for the first four milliseconds, but some strain records ... |
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| Structural Dynamics of Maneuvering Aircraft |
SEP 87 |
|
| Authors:
M. M. Reddi; CONRAD TECHNOLOGIES INC KING OF PRUSSIA PA
|
| The technical objectives of the research are to establish the minimum level of modeling necessary for predicting the dynamic stresses in fighter aircraft during maneuvers and transitions between maneuvers, to identify the physical phenomena which are significant, to identify potential shortfalls in current aircraft design technology and to identify areas for further research. A symmetric wing, modeled as a beam with quasi-steady aerodynamic loads introduced through the vortex lattice method, ... |
|
| The Effect of Mass, Wind Angle, and Erection Technique on the Aeroelastic Behaviour of a Cable-Stayed Bridge Model (Effet de la Masse, de L'Angle du Vent et de la Technique D'Erection sur le Comportement Aeroelastique d'une Marquette de Pont a Haubans) |
SEP 87 |
|
| Authors:
S. J. Zan; NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report presents the results of an aeroelastic investigation into the dynamic response of a cable-stayed bridge to wind loading. The investigation is a continuation of an earlier study in which the deck response was investigated for nine deck sections in three different flows. The present investigation used a plate girder section section only and was concerned with the effects of mass, yawed winds and erection phases on the response ... |
|
| A Study of Lateral Pressures on Basement Walls Due to Swelling Soils |
SEP 87 |
|
| Authors:
Warren K. Wray; TEXAS TECH UNIV LUBBOCK DEPT OF CIVIL ENGINEERING
|
| A study was made of the technical literature pertaining to the topic of lateral pressures transmitted to nonyielding, rigid basement walls by swelling expansive soils. The objective of the study was to determine if there was available a method whereby pressures transmitted to rigid basement walls could be practically measured and reasonably predicted for design purposes. An extensive bibliography of pertinent technical publications was developed. The publications which formed the ... |
|
| Importance of Rigid-Body Motions on a Single-Degree-of-Freedom Model |
SEP 87 |
|
| Authors:
Robert L. Hall; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| The study presents the effect of rigid body motion on the single- degree-of-freedom (SDOF) model presently used for dynamic analyses of buried roof slabs. The effect of rigid body motion is incorporated by adding a second degree of freedom to the model. Relative displacements between the roof and the structure are given for comparison. The results indicate that at overpressures required to cause severe damage to a relatively hard, shallow ... |
|
| State-of-the-Art for Assessing Earthquake Hazards in the United States. Report 26. Parameters for Specifying Magnitude-Related Earthquake Ground Motions |
SEP 87 |
|
| Authors:
E. L. Krinitzsky; Frank K. Chang; Otto W. Nuttli; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| A set of charts is presented that relate earthquake magnitude and distance from source to peak horizontal acceleration, velocity, and duration for hard and soft sites. The charts are in two groups: one for shallow plate boundary earthquakes with focal depths < or = 19 km; another for subduction zone eqarthquakes with focal depths < or = 20 km. The motions that are obtainable from these charts are for use ... |
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| Electromagnetic Damping and Vibration Isolation of Space Structures |
05 AUG 87 |
|
| Authors:
J. K. Hulbert; Bruce W. Maxfield; INNOVATIVE SCIENCES INC SAN LEANDRO CA
|
| Structures used in the vacuum, zero gravity environment of space are quite different form earth-bound system. Vibrations induced in a space structure by the operation of equipment internal to the structure should, to the greatest extent possible, be dissipated through heat generation so that this vibrational energy is not simply redistributed throughout the structure. The usual restricted fluid flow dashpot damping system has several serious drawbacks when operating within a ... |
|
| Australian Structures Response Evaluation: Ground Shock and Air Blast Measurements for Site Investigation Survey |
AUG 87 |
|
| Authors:
Phillip Box; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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| A site investigation survey was conducted during November 1986 as a preliminary requirement for the drafting of a trials plan associated with the proposed Australian Structures Response Evaluation Trials. The site near Woomera, South Australia was formerly used by the European Launcher Development Organization during the 1960's. Ground shock nd air blast measurements were conducted during the survey. This report details the instrumentation and the techniques used for making these ... |
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| Centrifugal and Numerical Modeling of Buried Structures. Volume 3. A centrifuge Study of the Behavior of Buried Conduits Under Airblast Loads |
14 JUL 87 |
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| Authors:
James P. Whittaker; COLORADO UNIV AT BOULDER DEPT OF CIVIL ENVIRONMENTAL AND ARCHITECTURAL ENGINEE RING
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| The principle object of the research was to provide a better understanding of the behavior of the soil-structure interaction phenomena associated with buried conduits subjected to airblast loads. A parametric study was performed to experimentally determine the effects of airblast loads on 4-in diameter micro-concrete pipes, embedded horizontally in a dry sand. The parameters varied in the study included the gravity level, the applied airblast pressure level, the relative density ... |
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STRUCTURAL RESPONSE
