As the capabilities of computational fluid dynamics (CFD) to model full aircraft config­ urations improve, and the speeds of massively parallel machines increase, it is expected that CFD simulations will be used more and more to steer or in some cases even replace traditional flight test analyses. The mission of the US Air Force SEEK EAGLE office is to clear any new weapon con­ figurations and ...

the semi-classical model of atom-field interaction has been fully studied for some multilevel atoms, e.g. vee, l, cascade x , y, and inverted y and so on. this issue is developed into the full-quantum electrodynamics formalism, where the probe and coupling electromagnetic fields are quantized. in this article, we investigate the full-quantum model of absorption and dispersion spectrum of trappe...

There are a number of systems in which supercritical cryogenic fluids are used as coolants or propellant fluids. In some modern military aircraft, the fuel is pressurized above its critical point and used as a coolant to remove heat from the aircraft engine. Accurate prediction of heat transfer coefficients to turbulent flows of supercritical fluids is essential in design of such systems. One o...

Runway length is usually a critical point in an airport system so, a great interest has been created for optimal use of this runway length. The most important factors in modeling of aircraft landing problem are time and cost while, the costs imposed on the system because of moving away from target times have different performances in terms of impact. In this paper, firstly, aircraft landing pro...

Experts from various aircraft sub-domains have to collaborate in order to design an aircraft system. Each sub-domain thereby focuses on a particular aspect of the system and uses special software tools to model those aspects and run various calculations. As those models partially overlap, inconsistencies can occur that might lead to delays in the design process or malfunctions of the aircraft s...

• This project aims to simplify the modeling process with a machine learning pipeline that generates a non-linear vehicle model for simulation, control design, and analysis with minimal reliance on domain knowledge. • A locally weighted linear regression [3] approach was investigated to provide full flight envelope modeling of an unconventional Vertical Takeoff and Landing (VTOL) aircraft with ...

This paper describes the design of a test rig to apply a representative pressure load to full-scale composite sandwich secondary aircraft structure. A generic panel was designed with features to represent those in composite sandwich secondary aircraft structure. To provide full-field strain data from the panels, the test rig was designed for use with optical measurement techniques such as therm...

The aerodynamic performance of the high-lift configuration greatly influences safety and economy commercial aircraft. Accurately predicting configuration, especially stall behavior, is important for aircraft design. However, complex flow phenomena configurations pose substantial difficulties to current turbulence models. In this paper, a three-equation k-(v^2)-{\omega} model Reynolds-averaged N...

A procedure for estimating fuel burned based on actual flight track data, and drag and fuel-flow models is described. The procedure consists of estimating aircraft and wind states, lift, drag and thrust. Fuel-flow for jet aircraft is determined in terms of thrust, true airspeed and altitude as prescribed by the Base of Aircraft Data fuel-flow model. This paper provides a theoretical foundation ...

This paper discusses the distributed nature of airborne software intensive systems. The concept of fly-by-wire, the issues of safety, component communication, and certification are on the forefront of modern airborne applications. Since the communication between variety of onboard systems and subsystems is of paramount importance, the paper discusses the properties of new bus standard based on ...