Results 81 to 90 of about 180,632 (304)
Exploiting Aeolus winds in a regional numerical weather prediction model
Quarterly Journal of the Royal Meteorological Society, EarlyView.Aeolus measured winds have proven to be beneficial for global models. However, demonstrating positive impact for limited‐area models has been a challenge so far. For the first time, we have demonstrated a statistically significant positive impact of Aeolus winds in a limited‐area model by using the 4DVar data assimilation technique and the most recent ...
Gert‐Jan Marseille +3 more
wiley +1 more source
Evaluation of the influence of the number of blades and diameter on propeller noise
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2016 The article presents the results of computational and experimental research of the effect of the number of blades and the diameter on the noise of the propeller operating at Reynolds numbers of more than 106. It is shown that an increase in the number of
P. A. Moshkov, V. F. Samokhin
doaj +1 more source
Residents' annoyance responses to aircraft noise events [PDF]
In a study conducted in the vicinity of Salt Lake City International Airport, community residents reported their annoyance with individual aircraft flyovers during rating sessions conducted in their homes.
Dempsey, T. K. +3 more
core +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.The climatological‐error covariance matrix used in three‐dimensional variational data assimilation (3DVar) provides smooth and isotropic increments spread to long distances. In contrast, three‐dimensional ensemble variational data assimilation (3DEnVar) with a purely ensemble‐error covariance matrix provides inhomogeneous increments and contains the ...
Kaushambi Jyoti +3 more
wiley +1 more source
Sound propagation elements in evaluation of en route noise of advanced turbofan aircraft [PDF]
Cruise noise from an advanced turboprop aircraft is reviewed on the basis of available wind tunnel data to estimate the aircraft noise signature at the source. Available analytical models are used to evaluate the sound levels at the ground.
Sutherland, Louis C., Wesler, John
core +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.Unexpected sea fog in the west coast of South Korea had a huge impact on the transportations in the Seoul–Incheon metropolitan area. We reproduced successfully the formation and evolution of a sea event with a transition of air–sea temperature difference using the Weather Research and Forecasting model.
Jeonghoe Kim +3 more
wiley +1 more source
Preliminary measurements of aircraft airframe noise with the NASA CV-990 aircraft [PDF]
Flight tests were conducted in a CV-990 jet transport with engines at idle power to investigate aircraft airframe noise. Test results showed that airframe noise was measured for the aircraft in the landing configuration.
Lasagna, P. L. +2 more
core +1 more source
Sliding Mode Control in Aerospace Applications: A Survey
International Journal of Robust and Nonlinear Control, EarlyView.ABSTRACT Sliding mode control (SMC) enjoys robustness to matched and unmatched (in the case of minimum phase input‐output dynamics) bounded perturbations, and finite time convergence. Second‐order and higher‐order sliding mode control systems (2‐SMC/HOSMC) retain all the advantages of sliding mode control, but in addition can be applied to systems of ...
Yuri Shtessel, Christopher Edwards
wiley +1 more source
Acoustic analysis of chevron nozzle: A CFD approach [PDF]
E3S Web of ConferencesNoise pollution from aircraft is a critical environmental issue, affecting not only wildlife but also human health and comfort, especially for populations living near airports.
Alsalami Zaid +5 more
doaj +1 more source
Aircraft noise synthesis system [PDF]
A second-generation Aircraft Noise Synthesis System has been developed to provide test stimuli for studies of community annoyance to aircraft flyover noise.
Grandle, Robert E., Mccurdy, David A.
core +1 more source