Wright-Patterson Air Force Base

About: Wright-Patterson Air Force Base is a other organization based out in Wright-Patterson AFB, Ohio, United States. It is known for research contribution in the topics: Laser & Mach number. The organization has 5817 authors who have published 9157 publications receiving 292559 citations. The organization is also known as: Wright-Patterson AFB & FFO.

Applications of Ultrafast Lasers for Optical Measurements in Combusting Flows

Abstract: Optical measurement techniques are powerful tools for the detailed study of combustion chemistry and physics. Although traditional combustion diagnostics based on continuous-wave and nanosecond-pulsed lasers continue to dominate fundamental combustion studies and applications in reacting flows, revolutionary advances in the science and engineering of ultrafast (picosecond- and femtosecond-pulsed) lasers are driving the enhancement of existing diagnostic techniques and enabling the development of new measurement approaches. The ultrashort pulses afforded by these new laser systems provide unprecedented temporal resolution for studies of chemical kinetics and dynamics, freedom from collisional-quenching effects, and tremendous peak powers for broad spectral coverage and nonlinear signal generation. The high pulse-repetition rates of ultrafast oscillators and amplifiers allow previously unachievable data-acquisition bandwidths for the study of turbulence and combustion instabilities. We review applications o...

Aeroelastic Tailoring of Composite Structures

Abstract: A wing-design optimization study is conducted on a composite wing. The objective is to evaluate the effect of the compositelayup orientation on theoptimized weight while satisfying constraints on strength, roll-reversalvelocity, and e utter velocity. The wing optimization studies are presented with the composite layups oriented at 5-deg increments up to § 20 deg from the midspar of the wing. The multidisciplinary optimization system, ASTROS, was used in the design study. This study, although not conclusive, indicates that optimal designs when subjected to multiple structural constraints are relatively insensitive to the orientation of the laminate layup. I. Introduction M ULTIDISCIPLINARYdesign optimization (MDO)hasbeen the subject of numerous investigations in recent years. This technology push is primarily attributed to the rapid growth in speed, data transfer,and storage capabilities of modern computers. Itis anticipated that in a few years the speed of computation may surpass the Ge ops/s range with similar improvements in memory devices. The computer’ s capabilities are doubling or tripling in a relatively short time, while the cost of computation and information processing is reducing by similar factors. These far-reaching developments in computers are the propelling force behind the rapid evolution of the so-called information highway . The information explosion is already affecting almost every facet of life in industrialized countrieswhilepushing industrializationofthe remainingcountries.The world is a very competitive market place for products. It is expected to be even better for the consumer. Cost, quality, and innovation are the key ingredients for success in such an environment. A wellorchestrated MDO strategy is the best means for improvement in all three areas. It is often the mistakes made in early design that haunt the bad performance of the products. MDO systems on modern computers allow the rapid evaluation of the operation scenarios of the products. The rapid strides in computers are the catalyst in promoting sophisticated computer architectures, database technology, and numerical methods. These developments, in turn, are providing the necessary infrastructure for integration of both disciplines and the designstages.Forexample,inairframedevelopment,aerodynamics, structures, and controls are the main disciplines; whereas in design, manufacture, operation, and maintenance are the stages of development. Each of these stages is further divided into manageable tasks that are appropriate to available resources. For example, the design task is traditionally conducted in conceptual, preliminary, and detail design stages. If we couple this view of design with the task of integration of the disciplines (such as aerodynamics, structures, and controls ), we have an almost intractable optimization problem, where the overall minimum cost is the primary driver. It is under

A Power Link Study of Wireless Non-Radiative Power Transfer Systems Using Resonant Shielded Loops

Abstract: This paper discusses the use of magnetically coupled resonators for midrange wireless non-radiative power transfer (WNPT). A quasi-static (circuit) model is developed to establish key measures of performance and to aid in design. The use of directly fed, resonant shielded loops for WNPT is also proposed for the first time. Two experimental WNPT systems employing shielded loops are reported. A comprehensive experimental study is performed, and the performance of the WNPT systems shows close agreement with analytical predictions and developed circuit models. With a single-turn system of loop radius 10.7 cm, power transfer efficiency of 41.8% is achieved at a loop separation of 35 cm (3.3 loop radii). When the number of turns is increased to ten, a power transfer efficiency of 36.5% is achieved at a loop separation of 56 cm (5.3 loop radii). Measured magnetic field levels in the vicinity of the WNPT systems are shown to closely agree with analytical field values.