Showing papers by "Vaughn College of Aeronautics and Technology published in 1994"
TL;DR: In this paper, the directional dependency of the vibrational wavefield in each component of an engineering structure is modelled by using a Fourier series and the resulting energy balance equations may be cast in the form of conventional SEA with the addition of non-direct coupling loss factors.
Abstract: In the statistical energy analysis (SEA) approach to high frequency dynamics it is assumed that the vibrational wavefield in each component of an engineering structure is diffuse. In some instances the directional filtering effects of structural joints can lead to highly non-diffuse wavefields, and in such cases SEA will yield a very poor estimate of the vibrational response. An alternative approach is presented here in which the directional dependency of the vibrational wavefield in each component is modelled by using a Fourier series. It is shown that, if required, the resulting energy balance equations may be cast in the form of conventional SEA with the addition of `non-direct' coupling loss factors. The method is applied to the bending and in-plane vibrations of various plate structures and a comparison is made with exact results yielded by the dynamic stiffness method. A significant improvement over conventional SEA is demonstrated.
71 citations
TL;DR: Crack growth and residual strength tests have been conducted on both Glare 3 and Glare 4 material as discussed by the authors, showing improvements in fatigue life of up to 100 times and improvements in residual strength of 40% compared with those for 2024-T3 monolithic aluminium alloy.
62 citations
TL;DR: In this paper, the buckling behavior of some composite stiffened panel structures subjected to in-plane compression and shear load combinations is analyzed using the finite strip method, a computer aided engineering analysis procedure.
44 citations
TL;DR: In this article, the authors summarized the economic arguments in favour of regulation and analyzed the operational and strategic developments among European airlines in response to regulatory liberalization, identifying four kinds of response: a search for size and market dominance; efforts to reduce operating costs; the use of new market- ing tools; and the introduction of new operating practices.
42 citations
TL;DR: In this article, a brief review of the electrodynamic responses of the middle atmosphere to lightning is given, focusing on the precipitation of energetic electrons from the magnetosphere, due to whistler mode electromagnetic waves.
19 citations
TL;DR: In this article, the authors investigate the likely reaction of airlines to emission taxes, assess the optimum tax level that minimizes the economic penalties on airlines whilst maximizing the reduction of fuel emission, and suggest how the taxes might be spent to be of benefit to both airlines and the environment.
16 citations
TL;DR: In 1989, the Council of the Royal Society of London established a study group to investigate the current status and future requirements of solar-terrestrial monitoring in the United Kingdom as mentioned in this paper.
10 citations
TL;DR: In this article, the results of calibrations of the airspeed measurement, distance constant and cosine response for a sensitive propellor (vane) anemometer are described.
Abstract: The results of calibrations of the airspeed measurement, distance constant and cosine response for a sensitive propellor (vane) anemometer are described. A triad of these anemometers may be used to measure wind velocity, and the estimated uncertainty in this measurement is evaluated for a typical triad and a range of wind directions.
8 citations
TL;DR: In this paper, the authors provide the theoretical foundation for a well-established, but.heretofore empirical, criterion for incipient separation in moderately hypersonic shock/boundary layer interactions.
Abstract: This study provides the theoretical foundation for a well-established, but.heretofore empirical, criterion for incipient separation in moderately hypersonic shock/boundary layer interactions. It is based on an examination of the leading high Reynolds number approximation to triple deck theory, combined with its reformulation in terms of the reference temperature concept. The analysis further provides extensions giving the effects of both low supersonic Mach numbers and non-adiabatic wall temperatures on incipient separation.
8 citations
TL;DR: In this paper, the aeropolitical relations between the USA and five European countries: the UK, Germany, France, Spain and the Netherlands are examined and the importance of the North Atlantic to the carriers that serve these routes and discusses the varied development of the different markets.
5 citations
TL;DR: In this article, the authors developed a new approach to dynamic modelling and closed-loop vibration damping control of a Hermes type multi-link flexible manipulator for two-dimensional vibratory motion of the vehicle/manipulator system in the pitch plane.
TL;DR: In this paper, the evolutionary process of safety improvements in the air transport industry has succeeded in making air travel safer than ever before, but will the development and introduction of the new large aircraft (NLA) raise new safety issues?