| Structural Mechanics for Adaptive Optics |
26-Jul-2009 |
6 pages |
| Authors:
Daniel J Inman; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
 | The research performed under this grant developed the structural mechanics of an adaptive optic system consisting of a membrane reflective surface stretched over a pressurized cavity. The work presented here starts under the assumption that the quality of optical system is described by Zernike Polynomials and proceeded by coupling the Zernike Polynomials to the membrane dynamics and provide several methods to control the membrane surface and hence the optical quality. ... |
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| Development and Validation of Eye Injury and Facial Fracture Criteria for the Focus Headform |
Dec-2008 |
8 pages |
| Authors:
Jill Bisplinghoff; Joseph Cormier; Stafan Duma; Eric Kennedy; Paul Depinet; Frederick Brozoski; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| A multi-year research effort focused on predicting eye and face injury resulting from blunt impacts has been completed through a collaborative partnership of Virginia Tech - Wake Forest, Center for Injury Biomechanics, Denton, and the United States Army Aeromedical Research Laboratory. The primary goal of this effort is the development and validation of a physical headform capable of measuring face and eye impact loads. In order to assess the capability ... |
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| Viscoelastic Characterization of Aliphatic Polyurethane Interlayers |
OCT 2007 |
36 pages |
| Authors:
Neil MacAloney; Andres Bujanda; Robert Jensen; Nakhiah Goulbourne; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The viscoelastic properties of several commercially available aliphatic thermoplastic polyurethanes were characterized. Differential scanning calorimetry showed that for Deerfield 4700, Inter Materials IM 800, IM 800A, IM 1600, and IM 2500, there is a permanent physical change that occurs during heating. Dynamic mechanical analysis and shear rheometry were used to generate elastic and shear modulus master curves in the frequency domain for Inter Materials IM 800 A. The Williams-Landel-Ferry constants ... |
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| Eukaryotic Cell Cycle as a Test Case for Modeling Cellular Regulation in a Collaborative Problem-Solving Environment |
MAR 2007 |
146 pages |
| Authors:
John J. Tyson; Bela Novak; Kathy Chen; Jill C. Sible; Frederick R. Cross; Layne T. Watson; Clifford A. Shaffer; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The purpose of DARPA's BioSPICE Program was to provide a new and useful set of software tools for modeling biochemical pathways and molecular regulatory networks within living cells. Using nonlinear ordinary differential equations to capture the temporal dynamics of molecular control systems, the modeling team built successful computer models of cell cycle regulation in a variety of organisms, including yeast cells, amphibian embryos, bacterial cells and human cells. These models ... |
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| Dynamic Testing of In-Situ Composite Floors and Evaluation of Vibration Serviceability Using the Finite Element Method |
21 AUG 2006 |
452 pages |
| Authors:
Anthony R. Barrett; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The presented research examined three areas: best practices in high quality dynamic testing of in-situ floor systems, extensive dynamic testing of three bare (non-fit out) in-situ multi-bay steel composite floors to estimate their dynamic parameters/response and to identify trends in dynamic behavior, and development of a set of fundamental finite element (FE) modeling techniques to adequately represent the dynamic response of steel composite floors for the purpose of evaluating vibration ... |
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| Manufacture and Experimental Analysis of a Concentrated Strain Based Deployable Truss Structure |
MAY 2006 |
11 pages |
| Authors:
Juan M. Mejia-Ariza; Thomas W. Murphey; Eric L. Pollard; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| A truss structure was built and tested to advance deployable structures technology based on the concentrated strain approach. In 3rd order hierarchy systems, this architecture has the potential to provide a 10 fold improvement in mass efficiency, and demonstrate a linear compaction ratio that is five times better than current technology. A 101.6 cm x 12.7 cm x 12.7 cm test article was fabricated, and a buckling test and analysis ... |
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| Insecticide Exposure in Parkinsonism |
JAN 2006 |
89 pages |
| Authors:
Jeffrey R. Bloomquist; Bradley G. Klein; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| To study the etiology of Parkinson's disease as it may relate to Gulf War Syndrnme the insecticides chlorpyrifos (CPF) and/or permethrin (PM) were given 3 times over a two week period with or without a single dose of the Parkinsonian neurotoxin MPTP. Biomarkers were then analyzed at t = 1,14 and 28 days post-treatment. Potent up-regulation of dopamine transport biomarkers was observed with PM but not CPF at t = ... |
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| Electronic Textiles for in Situ Biomechanical Measurements |
DEC 2004 |
9 pages |
| Authors:
Tom Martin; Thurmon Lockhart; Mark Jones; Josh Edmison; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| This paper describes the benefits of and issues in designing and building an integrated body-worn electronic textile (e-textile) system capable of assessing a suite of biomechanical measures. Unlike laboratory-based systems this system would be worn by a soldier and could be used in a range of environmental conditions. A prototype e-textile developed at Virginia Tech has already shown promising results in de area of gait analysis. |
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| Molecular Beam Studies of Reactions Between Warfare Agents Simulants and Solid Surfaces |
27 OCT 2004 |
13 pages |
| Authors:
John R. Morris; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Our experimental studies are directed at elucidating the mechanisms of interfacial adsorption, desorption, and reactions in collisions between chemical warfare simulants and solid surfaces. The investigations are facilitated by using molecular beam scattering from well characterized, MgO surfaces and model self-assembled monolayer or multilayer surfaces. Much of our efforts for this funding period have been focused on constructing a state-of- the-art ultrahigh vacuum gas-dosing instrument, synthesizing new MgO nano- structured ... |
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| Multifactorial Assessment of Depleted Uranium Neurotoxicity |
OCT 2004 |
100 pages |
| Authors:
Bernard Jortner; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| This is a four-year study on the neurotoxic potential of depleted uranium (DU) in laboratory rats. Previous studies with Gulf War veterans and experimental animals exposed to embedded DU suggest that neurotoxicity may result from DU exposure (McDiarmid et al. 2000; Pellmar et al., 1999). The current investigation is designed to assess the neurotoxic potential of acute and chronic exposure to DU and the contribution of stress to expression of ... |
|
| Ammonia IR Absorbance Measurements with an Equilibrium Vapor Cell |
FEB 2004 |
329 pages |
| Authors:
Paul E. Field; Roger J. Combs; Robert B. Knapp; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Infrared (IR) absorbance spectra were acquired for 18 ammonia vapor pressures. The vapor pressures were generated with 15 gravimetrically prepared aqueous solutions and three commercial aqueous solutions using a dynamic method I.E., EQUILIBRIUM VAPOR CELL (EVC). Background IR spectra were obtained using the vapor pressure of distilled water. The IR absorbance (A) measurements were analyzed by computing ammonia vapor mole fractions (Y) or partial pressures (P) as a function of ... |
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| Multifactorial Assessment of Depleted Uranium Neurotoxicity |
OCT 2003 |
75 pages |
| Authors:
Bernard S. Jortner; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| This is the second year of a four-year project to evaluate neurotoxicity related to depleted uranium (DU) exposure and stress in rats. In this year, the project was modified based upon a scientific review of our project at the Force Health Protection Review of Depleted Uranium Projects. This resulted in addition of a pilot stress study, modification of the acute toxicity study and use of an en%enhanced stress model for ... |
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| Theory Analysis on Magnetoelectric Voltage Coefficients of the Terfoneol-D/PZT Composite Transducer |
JUN 2003 |
9 pages |
| Authors:
Shuxiang Dong; JieFang Li; Dwight Viehland; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The magnetoelectric response of magnetostrictive/piezoelectric laminate composites has been investigated. Based on the piezoelectric and piezomagnetic constitutive equations, and motion equation for the composite plate, the magnetoelectric equivalent circuit has been derived, and the magnetoelectric coefficients predicted. Prototype devices of, as an application example, Terfenol-D/PZT composite plates were fabricated, and experimental values for the magnetoelectric voltage coefficient coincided with the predicted ones. |
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| Advanced Composite Performance: Material Behavior and Life Cycle Prediction for Rotating Machines |
26 MAR 2003 |
60 pages |
| Authors:
Scott W. Case; Kenneth L. Reifsnider; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The Virginia Tech life prediction methodology is applied to composite materials to determine a fundamental understanding of material behavior and life cycle issues (e.g. fatigue damage, creep, creep rupture). Specific areas addressed in this activity include: (1) establishing the likely damage and failure modes for rotating machines; (2) constructing micromechanical models of the material failure modes; (3) constructing a methodology for the life analysis of composite rotors operating under high ... |
|
| Insecticide Exposure in Parkinsonism |
JAN 2003 |
61 pages |
| Authors:
Jeffrey R. Bloomquist; Bradley G. Klein; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Behavioral, neurochemical, and immunocytochemical studies are characterizing the possible role of insecticide exposure in the etiology of Parkinson's disease as it may relate to Gulf War Syndrome. Chlorpyrifos (CP) and/or permethrin (PM) were given 3 times over a two week period by injection (CP subcutaneous and PM intraperitoneal), with or without a single dose of the Parkinsonian neurotoxin, MPTP (20-30 mg/kg, intraperitoneal). PM upregulates dopamine transporter (DAT) expression with a ... |
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| Revitalizing the Navy's R&D Centers - Opportunities for University Collaborations |
2003 |
10 pages |
| Authors:
Eugene F. Brown; Robert Kavetsky; Alfred L. Wicks; Barry J. Mohle; Charles R. Garnett; Larry C. Triola; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| This paper provides 1) two examples of collaborative research between Virginia Tech and the Naval Surface Weapons Center in Dahlgren, Virginia (NSWCDD) both from the perspective of a Virginia Tech faculty member (the third author, ALW) who was involved in both projects and from the perspective of two Dahlgren engineers (the fourth and fifth authors, BJM and CRG) with whom he has worked, and 2) a table obtained with the ... |
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| Control of Sound Radiation and Reflection With Advanced Smart Acoustic Blankets |
NOV 2002 |
24 pages |
| Authors:
Chris R. Fuller; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The work carried out in this project has successfully demonstrated the potential of advanced smart acoustic blankets for reducing sound transmitted into payload fairings. The smart blanket consists of active tiles embedded in standard acoustic blanket material. The lightweight honeycomb tiles are supported by specially developed active-passive piezoelectric mounts, which implement Thunder elements. The mounts are designed to provide passive isolation of transmitted sound, which is augmented by the application ... |
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| Multifactorial Assessment of Depleted Uranium Neurotoxicity |
OCT 2002 |
26 pages |
| Authors:
Bernard S. Jortner; David S. Barber; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| This is a three-year study on the neurotoxic potential of depleted uranium (DU) in laboratory rats. The effect of stress on DU kinetics and toxicity will also be evaluated. Previous studies with Gulf War veterans and experimental animals exposed to embedded DU suggest that neurotoxicity may result from DU exposure (McDiarmid et al. 2000; Pellmar et al.1 1999). The current investigation is designed to assess the neurotoxic potential of acute ... |
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| Effect of Isokinetic Strength Training and Deconditioning on Bone Stiffness, Bone Mineral Density and Bone Turnover in Military-Aged Women |
JUN 2002 |
|
| Authors:
William G. Herbert; Sharon M. Nickols-Richardson; Lawrence H. Cross; Warren K. Ramp; David F. Wooten; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
 | For physically active military personnel, stress fractures are debilitating and costly. Female soldiers sustain twice the number of stress fractures compared to males. Exercise interventions for women are needed to promote military readiness in ways that enhance bone strength and reduce stress fractures. This study, currently in progress, is investigating the effects of 30 weeks of concentric Vs eccentric isokinetic resistance training on bone stiffness (mechanical impedance), bone quality (mineral ... |
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| Post Stall Flow Control Over Swept Wings |
JUL 2001 |
36 pages |
| Authors:
Demetri Telionis; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| An experimental study of active control of fully separated flow over a symmetrical circular-arc wing at high angles of attach was performed. The wing was swept at angles up to 45 degrees. The experiments were carried out in a low- speed, open-circuit wind tunnel. Angles of attack from 10 to 40 degrees were tested. The actuation was provided by the periodic oscillation of a 4-percent- chord flap placed on the ... |
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| Effect of Isokinetic Strength Training and Deconditioning on Bone Stiffness, Bone Density and Bone Turnover in Military-Aged Women |
JUN 2001 |
48 pages |
| Authors:
William Herbert; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| For physically active military personnel, stress fractures are debilitating and costly. Female soldiers sustain twice the number of stress fractures compared to males. Exercise interventions for women are needed to promote military readiness in ways that enhance bone strength and reduce stress fractures. This study, currently in progress, is investigating the effects of 30 weeks of concentric Vs eccentric isokinetic resistance training on bone stiffness (mechanical impedance), quality (mineral density ... |
|
| An Investigation of Adaptive Signal Processing Approaches to Active Combustion Control |
JUN 2001 |
12 pages |
| Authors:
Michael A. Vaudrey; WIlliam R. Saunders; William T. Baumann; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| There has been significant progress made in understanding dynamic models and control system designs for active control of thermoacoustic instabilities. During the past several years, there has been an increasing trend away from mostly empirical or experimentally-based active combustion control (ACC) methods in exchange for control systems that rely on more accurate understanding of the dynamic processes involved in the thermoacoustic limit cycling response. Early demonstrations of phase-shifting ACC designs ... |
|
| IR Absorbance Measurement of Variable Composition Aqueous VOCs |
FEB 2001 |
386 pages |
| Authors:
Paul E. Field; Roger J. Combs; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Quantitative infrared (IR) absorbance spectra are compiled, which rely on the equilibrium-vapor cell method for generating controlled amounts of target analytes. The target analytes are the solutes of variable composition aqueous solutions of volatile organic compounds (VOCs). The VOCs investigated in this study are acetone, 2-butanone, ethanol. isopropanol, and methanol. Tbe resulting vapor liquid equilibrium for the variable composition solutions provides analyte vapor concentrations in the Beer's law range of ... |
|
| Insecticide Exposure in Parkinsonism |
JAN 2001 |
70 pages |
| Authors:
Jeffrey Bloomquist; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Behavioral, neurochemical, and immunocytochemical studies characterized the possible role of insecticide exposure in the etiology of Parkinson's disease as it may relate to Gulf War Syndrome. Chlorpyrifos (CP) and permethrin (PM) were given 3 times over a two week period by injection (CP, subcutaneous and PM intraperitoneal). PM (1.5 mg/kg) increased dopamine transport 33%, which is at least two orders of magnitude below its LD5O. CP (100 mg/kg) reduced transport ... |
|
| Miniaturized 3-D Mapping System Using a Fiber Optic Coupler as a Young'sDouble Pinhole Interferometer |
30 NOV 2000 |
91 pages |
| Authors:
Timothy L. Pennington; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Three-dimensional mapping has many applications including robot navigation, medical diagnosis and industrial inspection. However, many applications remain unfilled due to the large size and complex nature of typical 3-D mapping systems. The use of fiber optics allows the miniaturization and simplification of many optical systems. This research used a fiber optic coupler to project a fringe pattern onto an object to be profiled. The two outputs ... |
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| TEAMDEC: Integrative Decision Solutions with Multiple Information Sources |
SEP 2000 |
120 pages |
| Authors:
Eloise Coupey; Mark T. Jones; Haiyuan Wang; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Decision researchers have tended to focus on the characteristics of individual decision-making or of ad-hoc groups. In many applications, however, decisions are influenced by interactions among people who have specific skills and functions, and who may have an ongoing responsibility to the group. The functions of TeamDec are based on research that provides actionable insights about the unique nature of team-based decisions. To develop TeamDec, the contractor has integrated this ... |
|
| Navy Collaborative Integrated Information Technology Initiative |
30 AUG 2000 |
103 pages |
| Authors:
Kenneth Reifsnider; Rick Habayeb; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Quarterly progress report on NAVCIITI hardware and software configurations of smart antennas, multi-function antennas, secure configurable platform, command & control visualization, visualization and HCI, collaboration workspace, digital ships, mechanically flexible displays, fiberoptic LAN, network protocol interoperability, network system interoperability, and scheduling and resource management. |
|
| Development of an Improved Numerical Model for Concrete-to-Soil Interfaces in Soil-Structure Interaction Analyses |
AUG 2000 |
403 pages |
| Authors:
Jesus E. Gomez; George M. Filz; Robert M. Ebeling; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Soil-Structure Interaction (SSI) analyses have proven to be powerful tools for use in analyzing, designing, and monitoring geotechnical structures. SSI analyses are particularly useful in problems of complex geometry and loading conditions such as lock walls. Several SSI analyses of Corps of Engineers lock walls have shown that the behavior of the soil-structure interface has a significant influence on the magnitudes of the loads acting against a lock wall. They ... |
|
| Navy Collaborative Integrated Information Technology Initiative |
31 JUL 2000 |
76 pages |
| Authors:
Kenneth Reifsnider; Rick Habayeb; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Quarterly progress report on NAVCIITI hardware and software configurations of smart antennas, multi-function antennas, secure configurable platform, command & control visualization, visualization and HCI, collaboration workspace, digital ships, mechanically flexible displays, fiberoptic LAN, network protocol interoperability, network system interoperability, and scheduling and resource management. |
|
| Second International Conference on Fatigue of Composites |
JUN 2000 |
102 pages |
| Authors:
Kenneth Reifsnider; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| On June 4-7, 2000, the Second International Conference on Fatigue of Composites was held in Williamsburg, Virginia, USA. The first such conference was held in June 1997 in Paris, France. The present conference built on that foundation, by providing a forum for a limited number of leading reports from numerous countries around the world to present and discuss the science and technology of this subject Composite materials have 'come of ... |
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| Navy Collaborative Integrated Information Technology Initiative |
11 JAN 2000 |
44 pages |
| Authors:
Kenneth Reifsnider; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The long-term objective of the NAVCIITI program is to provide strong, integrated research capabilities in broad user communications testbeds, systems engineering, fiber optic sensors and transmission devices, secure and reliable wireless communications, effective user-friendly human computer interfaces, and scientific visualization to the Navy community. This initiative will improve the Navy's capabilities to support distributed computing, integrated services training, education, information dissemination, and simulation. The multiyear ... |
|
| Insecticide Exposure in Parkinsonism |
JAN 2000 |
39 pages |
| Authors:
Jeffrey R. Bloomquist; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| A series of behavioral, neurochemical, and immunocytochemical studies were undertaken to characterize the possible role of insecticide exposure in the etiology of Parkinson's disease as it may relate to Gulf War Syndrome. The insecticides under study are the organophosphorus compound chlorpyrifos and the pyrethroid, permethrin given 3 times over a two week period by injection (chlorpyrifos subcutaneous and permethrin intraperitoneal). Permethrin showed an up-regulation of dopamine transport ... |
|
| Subsystem Integration for Efficient Power Flow in 21st Century Airlifters |
01 SEP 1999 |
164 pages |
| Authors:
Douglas K. Lindner; Dusan Boroyevich; Konstantin Louganski; Sriram Chandrasekaran; George Korba; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| In this report we are concerned with modeling, simulation and dynamic stability of next generation DC power distribution systems for 21st century airlifters. These new power distribution systems allow for two way power flow between the generator, power distribution system, and loads (actuators, avionics, environmental control system). This two way power flow implies that all of these subsystems dynamically interact with each other. An extensive simulation block library was developed ... |
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| Navy Collaborative Integrated Information Technology Initiative |
30 AUG 1999 |
13 pages |
| Authors:
Kenneth Reifsnider; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Progress report for the NAVCIITI Program for the 8th monthly period of the grant. The long-term objective of this program is to provide strong, integrated research capabilities in broad user communications testbeds, systems engineering, fiber optic sensors and transmission devices, secure and reliable wireless communications, effective user-friendly human computer interfaces, and scientific visualization to the Navy community. This initiative will improve the Navy's capabilities to support distributed computing, integrated services ... |
|
| CAVE Visualization |
12 AUG 1999 |
6 pages |
| Authors:
Ronald Kriz; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Report on CAVE(TM) hardware and software configurations, a collaborative CAVE(TM) environment, and recommendations for a large format CAVE. |
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| Techniques for Video Code Optimization |
12 AUG 1999 |
4 pages |
| Authors:
Jeffrey H. Reed; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Report summarizes development video compression algorithms that maintain consistent visual quality for video signals transmitted over a hostile channel and create efficient low-power encoder/decoder modules that implement the algorithms. |
|
| Test Bed Demonstration Using MRLife/Definition of State Space for Regional Consortium |
12 AUG 1999 |
6 pages |
| Authors:
Kenneth Reifsnider; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Progress report on the implementation of a test bed based on MRLife prediction code. This demonstration will be extended to a Navy consortium within a state space for regional collaboration, whose progress is described. |
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| Guidelines for Design of User Based Navigation in a Virtual Environment and Eye-tracking study within a Virtual Environment |
12 AUG 1999 |
2 pages |
| Authors:
Deborah Hix; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Report on status of delayed completion of the development of guidelines and data for user navigation within a virtual environment. |
|
| 11TH VPI&SU Symposium on Structural Dynamics and Control |
18 MAY 1999 |
12 pages |
| Authors:
Daniel J. Inman; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| This grant was in support of the conference entitled, "11th VPI&SU symposium on Structural Dynamics and Control." The symposium was held on the campus of Virginia Polytechnic Institute and State University (Virginia Tech) inBlacksburg, Virginia, on May 12 - 14, 1997. The symposium consisted of 65 paperspresented over a three-day period. The results of the conference have been published in a bound volume entitled, Structural Dynamics and Control. |
|
| The Third Internationai Conference on Progress in Durability Analysis of Composite Systems |
01 FEB 1999 |
345 pages |
| Authors:
Kenneth L. Reifsnider; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Composite materials are widely used in a variety of applied technologies including transportation, off-shore, power, electronics, communications, sports equipment, and infrastructure industries. In the last few years, these applications have matured in many ways. For example, polymer composites are increasingly used in primary and man-rated structures. A controlling feature of the general use of composite systems is their damage tolerance, durability, and reliability. That is the subject of the present ... |
|
| Active Control of Radiated Sound with Integrated Piezoelectric Composite Structures. Volume 1 |
06 NOV 1998 |
49 pages |
| Authors:
Christopher R. Fuller; L. E. Cross; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The report describes work by MRL-PSU on developing an constructing a new actuator called PANEL based upon using double amplification obtained from a system of orthogonal bimorph piezoelectric elements covered with an acoustic diaphragm configured in a flextensional type manner. The resultant PANEL source after many iterations of analysis, development, construction and testing was found to provide amplification ratios of around 250:1 and generate diaphragm vibration levels of the order ... |
|
| Active Control of Radiated Sound With Integrated Piezoelectric Composite Structures. Volume 2 Appendices (Concl.) |
06 NOV 1998 |
300 pages |
| Authors:
Christopher R. Fuller; L. E. Cross; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The report describes work by MRL-PSU on developing an constructing a new actuator called PANEL based upon using double amplification obtained from a system of orthogonal bimorph piezoelectric elements covered with an acoustic diaphragm configured in a flextensional type manner. The resultant PANEL source after many iterations of analysis, development, construction and testing was found to provide amplification ratios of around 250:1 and generate diaphragm vibration levels of the order ... |
|
| Active Control of Radiated Sound with Integrated Piezoelectric Composite Structures. Volume 3: Appendices (Concl.) |
06 NOV 1998 |
288 pages |
| Authors:
Christopher R. Fuller; L. E. Cross; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The report describes work by MRL-PSU on developing an constructing a new actuator called PANEL based upon using double amplification obtained from a system of orthogonal bimorph piezoelectric elements covered with an acoustic diaphragm configured in a flextensional type manner. The resultant PANEL source after many iterations of analysis, development, construction and testing was found to provide amplification ratios of around 250:1 and generate diaphragm vibration levels of the order ... |
|
| Linking Leadership Emergence to Leadership Effectiveness and Team Performance in a Military Population |
OCT 1998 |
76 pages |
| Authors:
Roseanne J. Foti; Neil M. Hauenstein; Joseph A. Sgro; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| According to Katz and Kahn (1978), leadership implies an influence increment, that goes beyond mechanically complying with one's role in an organization and routinely applying rewards or coercive power. A key argument we will make is that the ability to go beyond one's formal role depends on how a person is perceived by others. Based on this logic, we define leadership as the process of being ... |
|
| Static and Dynamic Analysis of Structural Frameworks Comprised of Inflatable Arches and Beams |
30 MAR 1998 |
6 pages |
| Authors:
Raymond H. Plaut; Rakesh K. Kapania; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| This project investigated the behavior of large tent-like structures supported by pressurized arch-shaped tubes. These structures are to be used by the U.S. Army as temporary maintenance shelters for helicopters and airplanes. Similar structures exist, but they are much smaller than those required for this purpose. The aim is to develop a structure that can be separated into lightweight modules which would be easy to transport, deploy, and disassemble. One ... |
|
| Wind Tunnel "Free Flight" on a Dynamic Strut |
09 JAN 98 |
54 pages |
| Authors:
D. P. Telionis; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| Work on this project was distributed to various tasks. The first was design construction and calibration of a simple, one degree of freedom model. The second was the development of fuzzy logic software needed to control the motion. The third was appropriate balance systems and dynamic calibration techniques. A roll moment balance system was designed and constructed. The system was mounted to a stepper motor via a shaft which played ... |
|
| A Frequency Domain Analysis of Surface Heat Transfer/Free-Stream Turbulence Interactions in a Transonic Turbine Cascade |
NOV 96 |
234 pages |
| Authors:
David G. Holmberg; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The relationship of time resolved surface heat flux to the turbulent free stream flow over a turbine blade is investigated. Measurements are made in a transonic linear cascade with a modern high pressure turbine blade profile. Time resolved direct heat transfer measurements are made with Heat Flux Microsensor (HFM) inserts along the pressure side, and with one HFM directly deposited on the suction surface near the leading edge. Simultaneous velocity ... |
|
| Computation of Partial Vapor Pressures of Aqueous Volatile Organic Compound Solutions |
JUN 96 |
71 pages |
| Authors:
Paul E. Field; Roger J. Combs; Robert B. Knapp; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| A program is described for the evaluation of the partial vapor pressures of solution components dependent on the concentration in solution, total pressure, and temperature. The object of the program is to provide reliable values that represent the best estimate based on the large body of experimental data available in the literature. The basis of the estimate is the evaluation of the Wilson coefficients for calculating the activity coefficients of ... |
|
| Unsteady Flow Over a 6:1 Prolate Spheroid |
APR 96 |
525 pages |
| Authors:
Todd G. Wetzel; Roger L. Simpson; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
| The flow over a 6:1 prolate spheroid undergoing time dependent maneuvers is studied. The model is mounted on the Dynamic Plunge-Pitch-Roll (DyPPiR) model mount in the Virginia Tech Stability Wind Tunnel. he model undergoes 3O pitchup ramps in O.33s and a 13.50 submarine maneuver in O.25s. All tests are done at a Reynolds number of 4.2 million. Unsteady surface pressures, skid friction, and force and moment measurements are documented for ... |
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| Proceedings of the VPI&SU Symposium (10th) Structural Dynamics and Control Held in Blacksburg, Virginia on 8-10 May 1995 |
APR 96 |
503 pages |
| Authors:
Leonard Meirovitch; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
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| The Tenth Elacksburg Symposium must be regarded as the most successful to date in many respects. It has achieved the broadest coverage of the fields of structural dynamics and control, with applications from earthquake engineering, smart structures, robotics, aeroelasticity of aircraft and rotorcraft, large space structures, etc., as well as a good balance between theoretical and experimental papers. Also encouraging was the increasing participation of young researchers bringing new vitality ... |
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