Excellent opportunities exist for reducing the drag of aircraft by increasing the extent of laminar boundary-layer flow over the configuration. recent technological advances in airplane construction techniques and materials employing bonded and milled aluminum skins and composite materials allow for… More

1 for precise and fast trajectory following by the robotic systems the control system design based on single-in-put, single-output model for each joint is not adequate. we propose totake an approach for controller design based on recent results on invertibility and functional re- productibility in… More

Modern tactical aircraft flying at high angles of attack encounter viscous separation, vortex flows, vortex breakdown, unsteady flow situations and their effects on the lifting surfaces downstream. it is very important to analyze these flows in order to predict the stability derivatives accurately… More

The hypersonic vehicles flying at high altitudes operate in a flow regime where the noncontinuum effects near the surface and finite shock thickness due to low density make the conventional continuum techniques grossly inadequate. chemical nonequilibrium is also important under the low-density flow… More

The proposed research is directed towards a detailed analytical and numerical study of the unsteady vortex motionin the clap-fling motion, observed by weis-fogy, which couldyield lift coefficients of up to eight. the application of the clap-fling motion analogy to a compressor stage could, under… More

The hypersonic vehicles flying at high altitudes operate in a flow regime where the noncontinuum effects near the surface and finite shock thickness due to low-density make the conventional contimuum techniques grossly inadequate. chemical nonequilibrium is also important under the low-density flow… More

Development of dynamic controllers for real time control of robot arms has been difficult because of the large amount of computations required for the implementation of such algorithms. a combination of the numerical and symbolic manipulations is used by the symbolic polynomial technique to simplify… More

Structured grids have been used in the cfd applications for over 20 years. however, in recent years, it has become apparent that structured grids are not flexible enough for flows over very complex domains. unstructured grids are, therefore, receiving considerable attention. although, the use of the… More

Forebodies with vortex-generating side edges or chines blending into highly swept leading edges are known to stabilize the leading edge vortices through aerodynamic coupling at high angles of attack. however, in post-stall maneuvering flight chine vortex interaction with wing and vertical tails can… More

An experimental feasibility study is proposed of two separate aerodynamic concepts for direct and independent control of chine forebody vortices at high angles of attack and in sideslip: (a) longitudinally hinged chines that can be moved to variable dihedral or anhedral angle; and (b) spanwise… More

Proof of concept demonstration, of the 0.3 m transonic cryogenic wind tunnel in early 1970's, has paved way for large high reynolds number cryogenic tunnel like the national transonic facility (ntf) in 1984. the quality of data generated in a cryogenic tunnel is intimately related to the stability… More

Cold fusion occurs when two nuclei with very small relative energy tunnel through their relative coulomb barrier to initiate a nuclear reaction. recent reports of cold-fusion between hydrogen isotopes embedded in palladium and titanium have aroused a lot of activity in this area. to acheive the rate… More

A rapid, user-friendly and interactive graphics post processor program for the analysis of cfd data is proposed. the program will be able to handle structured and/or unstructured grids of single-or multi-block format. it will be flexible enough to plot fluid dynamic data at user specified arbitrary… More

This research is directed toward the volume visualization ona massively parallel computer (mpc) of the analyzed results in parallel with time-dependent analysis. in the present volume visualization technique, the volumetric data that maybe obtained from numerical or experimental studies are directly… More

The safety of flight operations of many general aviation (ga) aircraft is compromised by the lack of real-time, severe-weather information in the cockpit. this project will develop and demonstrate an automated cockpit weather-display system that will do all these things and more. in phase i, the… More

A 'control'vortex concept for generating high-alpha yaw and pitch control on low-observables type forebodies (viz., having diamond-shpaed chined cross sections), is proposed for exploratory low-speed wind tunnel study. Two parallel approaches for realizing the control concept will be evaluated on a… More

It is proposed to experimentally explore two active separation-control concepts aimed at stall alleviation and maximum-lift improvement on generic, vortex-dominated fighter configurations. The concepts comprise a delta wing incorporating transversely-hinged apex flaps oscillating in the pitch plane,… More

Leading edge vortex flap modifications are proposed for improvedlow-speed lift and L/D characteristics of supersonic cruiseaircraft. The aim is to increase the vortex-lift potential inaddition to generating vortex thrust on highly-swept wingconfigura

During wind tunnel testing of scaled aerodynamic models, the most critical measuring device is the internal strain gage balance. Modern internal balances are intricate and precise devices, which resolve the force moment data into Cartesian components accurately. While the accuracy of the balance… More