| Mathematical Fluid Dynamics of Plasma Flow Control over High Speed Wings |
Dec 2010 |
52 pages |
| Authors:
David Marshall; Alexander Fedorov; Victor Soloview; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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 | This report summarizes modeling of surface dielectric barrier discharge (SDBD) and flow control. A physics-based phenomenological model was used for analytical approximations of SDBD-induced body force and heat source, which were incorporated into a Navier-Stokes solver for CFD studies. Results show that a SDBD actuator can strongly affect laminar boundary layers and that tangential jets or concentrated vortices can be generated in the near-wall flow, thus making SDBD actuators attractive ... |
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| Reducing Fracture Tendencies in PCBN FSW Tools |
25 Jul 2010 |
16 pages |
| Authors:
David Marshall; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| The overall goal of this program is to increase the life of PCBN tools in friction-stir welding of high temperature metals through understanding of mechanisms of damage development in the tool materials, identifying microstructural characteristics that mitigate this damage, and developing methods for measuring relevant material properties. Some key results from the first year of study are; (i) demonstration that cracking by indentation with a Vickers indenter can be used ... |
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| Materials Design Principles for the Dynamic Fracture of Laminar Composite Structures |
21 Mar 2010 |
49 pages |
| Authors:
TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| The main thrust of our work was theoretical. Use was planned to be made of new data anticipated from a separately funded dynamic fracture study to be conducted at Purdue University. Unfortunately, substantial delays in specimen preparation have resulted in these data still being unavailable, which prevented us from completing a quantitative study of engineering design principles for pinned laminates, our original goal. Nevertheless, while such work cannot be included ... |
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| Mathematical Fluid Dynamics of Plasma Flow Control Over High Speed Wings |
Feb-2009 |
42 pages |
| Authors:
David Marshall; Alexander V Fedorov; Victor R Soloviev; V M Krivtsov; V G Soudakov; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| Develop theoretical models and computational tools for SDBD flow control applications. |
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| Ultrasonically Absorptive Coatings for Hypersonic |
13-May-2008 |
10 pages |
| Authors:
Norman D Malmuth; Alexander Fedorov; David Marshall; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| Laminar flow control (LFC) technologies reduce heat-transfer rates as well as the weight and complexity of thermal protection system (TPS). The laminar run can be substantially increased using an ultrasonically absorptive coating (UAC). The project is focused on maturing of the UAC-LFC methodology. Key components of the effort include wind-tunnel experiments, theoretical analysis, direct numerical simulation, fabrication and testing of ceramic materials that integrate UAC and TPS functions. To aid ... |
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| Mathematical Fluid Dynamics of Store and Stage Separation, Multi-Body Flows and Flow Control |
FEB 2008 |
49 pages |
| Authors:
Norman D. Malmuth; Alexander V. Fedorov; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| New insights have been gained in atmospheric and space launch stage separation from our studies of the aerodynamic interference between multiple bodies in supersonic flow. Quick means of estimating and controlling repulsion or attraction lift is an important enabling technology to size launch separation rocket motors. Asymptotic methods, scattering, slender body theories and CFD modeling have provided valuable systematic approximations schemes that advantageously couple with modern computational methods. Our theoretical ... |
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| Ocean Wave Energy Harvesting Devices |
JAN 2008 |
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| Authors:
Jeffrey T. Cheung; Earl F. Childress III; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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 | Development of a mechanically sound buoy design. which generated 10W average power in Beaufort Sea State I. and showed potential for up to 20W in Sea State 4. Development of a wave energy harvesting buoy capable of generating 2W in Sea State I. and with proper mechanical alignment able to generate over 4W. Development of two modeling capabilities: a classical mechanical model used lbr optimizing the electromagnetic design,. and a ... |
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| Ultrasonically Absorptive Coatings for Hypersonic Laminar Flow Control |
DEC 2007 |
72 pages |
| Authors:
David Marshall; Alexander Fedorov; Norm Malmuth; Janet Davis; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| This report summarizes results of theoretical, numerical and experimental studies related to ultrasonically absorptive coatings (UAC) for laminarization of hypersonic boundary layer flow. Laminar flow control (LFC) technologies reduce heat-transfer rates as well as the weight and complexity of thermal protection system (TPS). The effort has been focused on maturing of the UAC-LFC methodology. Key components of the effort include theoretical analysis, direct numerical simulation (DNS), wind-tunnel experiments, as well ... |
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| Test and Material Specifications for Dynamic Delamination Studies of Z-Pinned Laminates |
AUG 2007 |
7 pages |
| Authors:
Brian Cox; Christian Lundsgaard-Larsen; Roberta Massabo; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| We specify tests by which we expect to demonstrate inference from test data of a mixed mode dynamic cohesive law that represents the crack-shielding effects of through-thickness reinforcement (e.g., z-pins) in a laminate. |
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| High Fidelity Multidisciplinary Tool Development for Helicopter Quieting |
18 May 2007 |
22 pages |
| Authors:
Chung-Lung Chen; Ya-Chi Chen; Bing Chen; Rohit Jain; Tom Lund; Hongwu Zhao; Z -J Wang; Yuzhi Sun; Hossein Saberi; T -H Shih; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| Flows over helicopter blades are very complex turbulent flows. The blades experience dramatically different flow field at various azimuthal angles. Also, a rotor normally consists of many elastic blades, with a strong coupling between aerodynamics and structure. The problem is indeed multidisciplinary. Current helicopter blade designers use computational models, which depend heavily on experimental data and cannot be used to predict any novel design, which is a significant departure from ... |
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| Investigation of Lattice and Thermal Stress in GaN/AlGaN Field-Effect Transistors |
15 MAY 2007 |
7 pages |
| Authors:
Karim Boutros; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| This report describes work performed in support of the program "Investigation of Lattice and Thermal Stress in GaN/AlGaN Field-Effect Transistors" (Contract No N00014-05-C-0120) for the period 10/1/06 - 4/30/07. Our overall goal is to understand the role and contribution of residual stress and junction temperature on the degradation of AlGaN/GaN HEMT electrical device characteristics To execute this goal, electrical stress measurements will be performed on devices with varying residual stress, ... |
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| Mathematical Fluid Dynamic Modeling of Plasma Stall-Spin Departure Control |
APR 2007 |
36 pages |
| Authors:
Norman D. Malmuth; Alexander V. Fedorov; Victor Soloviev; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| This report summarizes theoretical and CFD studies related to surface discharge to quench stall-slip departure due to asymmetric vortex shedding on aircraft nose tips, augment directional control/authority agility, and develop tailless capability. This approach offers adaptability in rapidly changing flight and mission conditions, constructional simplicity, massless operation, no changes in aerodynamic shape, no influence on aircraft characteristics when the system is not in use, and low weight and power penalties, ... |
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| Ocean Wave Energy Harvesting Devices |
APR 2007 |
34 pages |
| Authors:
Jeffrey T. Cheung; III Childress Earl F.; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| Development of an ocean wave energy-harvesting device that can be used as a renewable energy source for ocean monitoring systems. The core technology is a mass-spring based high efficiency, low frequency linear generator that was integrated to a spar buoy to form a robust unit. Its dynamic sensitivity is improved by the use of a near zero friction liquid bearing. Through extensive theoretical modeling and wave tank testing, we studied ... |
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| Investigation of Lattice and Thermal Stress in GaN/A1GaN Field-Effect Transistors |
18 OCT 2006 |
7 pages |
| Authors:
Karim Boutros; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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| This report describes work performed in support of the program Investigation of Lattice and Thermal Stress in GaN/AlGaN Field-Effect Transistors (Contract No. N00014-05- C-0120) for the period 7/1/06 - 9/30/06. Our overall goal is to understand the role and contribution of residual stress and junction temperature on the degradation of AlGaN/GaN HEMT electrical device characteristics. To execute this goal, electrical stress measurements will be performed on devices with varying residual ... |
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Reports by Corporate Author
