We investigate whether there are common causes for the withdrawal from the regional aircraft market of three established manufacturers (BAE Systems, Fokker and Saab), while competitors thrived. We focus on the markets for 50and 100-seat aircraft. One cause concerning the 50-seat market was the introduction of a new class of aircraft, the regional jet, which pushed the less successful turboprop ...

For complex systems, such as the aircraft, the implementation of prognostics and health management (PHM) techniques can effectively improves the system performance and achieves the required reliability, safety and supportability. Traditionally, the design of the PHM system and the aircraft is often implemented separately and sequentially, which is not optimal in the view of the whole aircraft s...

The continued development of sophisticated aircraft with high fidelity control systems will enable autonomous execution of challenging tasks such as aerial refueling and close formation flight. In order to achieve such tasks in autonomous flight, an aircraft must sense other aircraft in close proximity and position itself relative to them. For example, aerial refueling requires the follower air...

The vertical stabilizer is a primary aerodynamic surface responsible for providing directional stability of an aircraft. Directional stability is further augmented by the yaw damping capability of the rudder using feedback control. When the rudder experiences faults or the vertical stabilizer is damaged, directional stability of an aircraft will be compromised. In the worst-case scenario, the v...

This paper develops and estimates a dynamic equilibrium model of the market for commercial aircraft. Airline choices are modeled as the solution to a discrete time dynamic programming problem, where in each period, each airline chooses one or more of various models of new and used aircraft. In equilibrium aircraft prices are such that no airline would benefit from buying, selling, trading or sc...

INTRODUCTION Radiation doses received onboard aircraft are monitored in Europe to protect aircrew in accordance with a European Union directive. The French Aviation Authorities have developed a system called SIEVERT, using calculation codes to monitor effective radiation doses. METHODS For the galactic cosmic ray component, a 3-D world map of effective dose rates is computed using available o...

Numerical optimization is traditionally viewed as a “machine centric” activity. This view dominates the majority of numerical optimization packages today, where user interaction is normally limited to the problem definition phase or visualization of the results with little or no interaction at design or run time. Surprisingly we are surrounded by many examples of successful engineering systems ...

The Electromagnetic Aircraft Launch System (EMALS) offers significant benefits to the aircraft, ship, personnel, and operational capabilities. EMALS has such advantages as high thrust, good controllability, reusable, etc., as a launching motor, a double-side plate Permanent Magnet Linear Synchronous Motor (PMLSM) can provide high instantaneous thrust. This paper presents the design and analysis...

In the field of aeronautics, shape morphing has been used to identify those aircraft that undergo substantial geometrical changes in their external shape to enhance or adapt to their mission profiles during flight. This creates superior system capabilities not possible without morphing shape changes. The objective of morphing concepts is to develop high performance aircraft with lifting surface...

The replacement of steam catapults with electromagnetic ones is becoming an overwhelming trend in aircraft launch systems. The Electromagnetic Aircraft Launch System (EMALS) offers significant benefits to the aircraft, ship, personnel, and operational capabilities. EMALS has such advantages as high thrust, good controllability, reusable, etc., as a launching motor, a double-side plate Permanent...