As rockets and jets on military aircraft become more powerful, the noise they produce can lead to structural fatigue, hearing damage, and community disturbances. Noise-reduction technologies and sound radiation prediction require accurate characterization of the noise sources within rocket plumes and jets. Near-field acoustical holography techniques were used to visualize the sound field in the...

This study analyzes in situ airborne measurements from the 2008 Stratosphere–Troposphere Analyses of Regional Transport (START08) experiment to characterize gravity waves in the extratropical upper troposphere and lower stratosphere (ExUTLS). The focus is on the second research flight (RF02), which took place on 21–22 April 2008. This was the first airborne mission dedicated to probing gravity ...

The study of hierarchical, hybrid control systems in the framework of air traac management (ATM) is presented. The need for a new ATM arises from the overcrowding of large urban airports and the need to more eeciently handle larger numbers of aircraft, without building new runways. Recent technological advances, such as the availability of relatively inexpensive and fast real time computers bot...

The continue-time unscented Kalman filter (UKF) is developed to estimate the state of a jet transport aircraft. The UKF is based on the nonlinear longitudinal aircraft equations of motion, and it is designed to provide estimates of horizontal and vertical atmospheric wind inputs. The optimal state and disturbance estimates are incorporated in feedback control laws based on the slowand fast-time...

Abstract FA-50 aircraft is a combat version of the KAI T-50 Golden Eagle jet trainer. The development began in October 1997.The phase finished January 2006, during which 6 prototypes were built. It worth noting that 2012, was awarded military certificate issued by Korean MAAC (Military Aircraft Airworthiness Committee) as first fighter-class aircraft. On 16 September 2022, approval ceremony for...

The high noise levels being experienced in some military fast jet aircraft and helicopters generally result in a reduction in the intelligibility of speech communications. A study has been conducted to assess the effect of reducing noise levels at the ear, by the use of current Active Noise Reduction (ANR) systems, on speech intelligibility in aircraft noise environments. The results of this st...

This investigation has been carried out under a contract awarded by the Netherlands Directorate-General of Civil Aviation (RLD), contract number LI/99.121/2. Summary Previous research has suggested that cargo operators suffer a disproportionally high number of accidents. The degree of unsafety could however not properly be quantified due to lack of data. The objective of the underlying study wa...

Administration (FAA), air traffic is expected to double nationally by the year 2017. Increased air traffic also means an increase in airplane noise. To help regulate the impact of noise on the environment, the FAA established the Airport Noise and Capacity Act in 1990, which required all civil jet aircraft over 75,000 pounds to reduce noise and lessen their environmental effects overall by 1 Ja...

The paper discusses the possible use of binocular cues by aircraft pilots in the final landing phase through a review of literature. The review includes medical and psychophysical literature, as well as works on pilot training, certification and flight experiments. It was found that stereopsis can be used as a depth cue up to several hundred meters. However, in situations where monocular cues a...