scholarly journals Aeronautical Engineering

10.5772/35789 ◽  
2012 ◽  
Author(s):  
aslav Mitrovi ◽  
Aleksandar Bengin ◽  
Neboja Petrovi ◽  
Jovan Jankovi
2013 ◽  
Vol 60 (2) ◽  
pp. 185-197 ◽  
Author(s):  
Paweł Sulikowski ◽  
Ryszard Maronski

The problem of the optimal driving technique during the fuel economy competition is reconsidered. The vehicle is regarded as a particle moving on a trace with a variable slope angle. The fuel consumption is minimized as the vehicle covers the given distance in a given time. It is assumed that the run consists of two recurrent phases: acceleration with a full available engine power and coasting down with the engine turned off. The most fuel-efficient technique for shifting gears during acceleration is found. The decision variables are: the vehicle velocities at which the gears should be shifted, on the one hand, and the vehicle velocities when the engine should be turned on and off, on the other hand. For the data of students’ vehicle representing the Faculty of Power and Aeronautical Engineering it has been found that such driving strategy is more effective in comparison with a constant speed strategy with the engine partly throttled, as well as a strategy resulting from optimal control theory when the engine is still active.


Author(s):  
Aaron R. Byerley ◽  
Kurt P. Rouser ◽  
Devin O. O’Dowd

The purpose of this paper is to explore GasTurb 12, a commercial gas turbine engine performance simulation program, for supplementary use on an introductory propulsion design project in an undergraduate course. This paper will describe several possible opportunities for supplementing AEDsys (Aircraft Engine Design System Analysis) version 4.012, the engine design software tool currently in use. The project is assigned to juniors taking their first propulsion course in the aeronautical engineering major at the USAF Academy. This course, Aeronautical Engineering 361, which focuses on cycle analysis and selection, is required of all aero majors and is used to satisfy the ABET Program Criterion requiring knowledge of propulsion fundamentals. This paper describes the most recent design project that required the students to re-engine the USAF T-38 with the aim of competing for the Advanced Pilot Training Program (T-X) program. The goal of the T-X program is to replace the T-38 aircraft that entered service in 1961 with an aircraft capable of sustained high-G operations that is also more fuel efficient. The design project required the students to select an engine-cycle for a single, non-afterburning, mixed stream, low bypass turbofan engine to replace the two J85 turbojets currently in the T-38. It was anticipated that the high specific thrust requirements might possibly be met through the use of modern component measures of merit to include a much higher turbine inlet temperature. Additionally, it was anticipated that the required 10% reduction in thrust specific fuel consumption might possibly be achieved by using a turbofan engine cycle with a higher overall pressure ratio. This paper will describe the use of GasTurb 12 to perform the same design analysis that was described above using AEDsys as well as additional features such as numerical optimization, temperature-entropy diagrams, and the generation of scaled, two-dimensional engine geometry drawings. The paper will illustrate how GasTurb 12 offers important supplementary information that will deepen student understanding of engine cycle design and analysis.


1994 ◽  
Vol 98 (975) ◽  
pp. 192-193
Author(s):  
A.W. Bloy

The teaching of aircraft stability and control at university usually progresses to the complexity of six degrees of freedom with a large array of aerodynamic, gravitational and inertial terms. It is therefore essential to ensure that students have a good grasp of fundamental dynamic characteristics such as damping and natural frequency, and any demonstration in which students observe aircraft motion is particularly helpful. At Manchester University this is achieved by a windtunnel demonstration of aircraft dynamic stability and response in pitch to a sinusoidal gust generator.


2021 ◽  
Vol 56 (6) ◽  
pp. 922-929
Author(s):  
E. V. Lomakin ◽  
S. A. Yurgenson ◽  
B. N. Fedulov ◽  
A. N. Fedorenko

Abstract— The conventional design in aeronautical engineering is reinforced shell, which for most structures is a thin shell with a stringer set. This article compares the behavior of a conventional reinforced shell and a spaced shell metamaterial structure with a reinforced set using the example of a main airplane pressure bulkhead. The evaluation criterion is to ensure the required level of residual strength when the limiting state is reached.


1967 ◽  
Vol 71 (677) ◽  
pp. 349-354
Author(s):  
H. Deplante

The Twentieth Louis Blériot Memorial Lecture held jointly by the Society and the Association Française Ingenieurs et Techniciens de l’Aeronautique et de l’Espace (AFITAE) was given in London on 13th April by Monsieur Henri Deplante, Technical Director, Avions Marcel Dassault, on “Four Combat Aircraft Concepts”.The Chair was taken by Mr. A. D. Baxter, MEng, CEng, FRAeS, President of the Society. After welcoming French colleagues, especially Monsieur Jules Jarry, President d’Honneur of AFITAE, and several former Louis Blériot lecturers, Mr. Baxter said that Louis Btériot, one of France’s great aviation pioneers, had made the first practical link in aeronautics between their two countries; by the institution of this lecture they had initiated new technical links and provided inspiration on both sides of the Channel—he thought that inspiration had led to an industrial co-operation which they hoped would continue and extend to their mutual advantage.Introducing the lecturer, die President said that Monsieur Henri Deplante, who was now Technical Director of Avions Marcel Dassault, had been connected with aeronautical engineering since 1930 when he had joined the then Avions Marcel Bloch.Monsieur Deplante had served with the Free French Forces during the War; he was a member of the first Parachute Brigade in the Special Air Services and had been awarded the DSO. After the War he had helped to revive the French Aircraft Industry and the list of new aircraft which Dassault had designed in this post-war period was, he thought, evidence of his ability and success in that direction. Monsieur Deplante had lectured to four of the Society’s Branches since 1963 and they were delighted to have him as the 20th Louis Blériot Lecturer.


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