May
9
11:20 AM11:20

The influence of sideways oscillations on friction, 2nd YTRS, Berlin

  • Technische Universität Berlin, H 1035 (map)
  • Google Calendar ICS

Presentation at the 2nd Young Tribological Researcher Symposium (YTRS) at the Technical University of Berlin.

Title:
The influence of sideways oscillations on friction

Authors:
J. Benad (1), K. Nakano (2), V. L. Popov (1,3), M. Popov (1,3,4)

1 Technische Universität Berlin, 10623 Berlin, Germany
2 Yokohama National University, Yokohama 240-8501, Japan
3 National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
4 National Research Tomsk State University, Tomsk 634050, Russia

Abstract: 
This study is devoted to a theoretical analysis of sliding friction under the influence of in- plane oscillations perpendicular to the sliding direction. Contrary to previous studies of this mode of active control of friction, we consider the influence of the stiffness of the tribological contact in detail and show that the contact stiffness plays a central role for small oscillation amplitudes. We consider the case of a displacement-controlled system, where the contact stiffness is small compared to the stiffness of the measuring system. It is shown that in this case the macroscopic coefficient of friction is a function of two dimensionless parameters – a dimensionless sliding velocity and dimensionless oscillation amplitude. In the limit of very large oscillation amplitudes, known solutions previously reported in the literature are reproduced. The region of small amplitudes is described for the first time.

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Oct
20
4:15 PM16:15

Presentation of the Flying V at the Aerodays 2015 in London

Short presentation of the Flying V aircraft configuration as part of a student competition at the Aerodays 2015.

The Aerodays are the European flagship event in aviation research and innovation and take place once, during each EU Research Framework Programme.

Title:

The Flying V - A new aircraft configuration for commercial passenger transport

Abstract:

In this work an idea on how to efficiently use the volume inside a pure flying wing for commercial passenger transport was derived and a configuration proposal was made with this idea. This configuration was then compared with a reference aircraft.

The idea is to arrange two cylindrical pressurized sections for the payload swept back in the shape of a V and place them inside the front section of a wing with the same sweep angle.

The streamwise cut through the oblique pressurized section is flat and elliptical and thus, it fits efficiently into conventional airfoils. The cut of the pressurized section orthogonal to the leading edge however, is circular. This leads to an efficient structural solution as pressure can be preserved well in a cylindrical shape.

The proposed configuration is called the Flying V. For this configuration transition and outer wings extend the span of the highly swept middle wing at a lower sweep angle to 65m. The Flying V was designed in this work with a capacity of 315 passengers in a two class layout for a cruise speed of Ma=0.85.

The Airbus A350-900 has the same capacity and cruise speed and was chosen as a reference aircraft. Preliminary estimations made in this work indicate that the Flying V might have a benefit over the reference in terms of aerodynamics (10% higher L/D) and mass (2% lower empty weight). More qualitative arguments in favor of the Flying V which could be derived are the compactness and simplicity of the configuration (less parts, no high-lift devices, no fairings, straight lines) and the shielding of the engines from the ground (low noise). Remarkable is also the elliptical lift distribution of the naturally stable design using only a moderate wing twist and no reflexed camber lines. A radio controlled model of the Flying V will be presented in this work to demonstrate these aerodynamic characteristics and support the estimations and simulations which were made.

So far, the Flying V is an idea and everything which is presented in this work can be regarded as the first step of a long iteration which will be necessary to develop the concept further.

More information:

Read more about the Flying V aircraft configuration on this website.

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Sep
23
2:15 PM14:15

Presentation of the Flying V at the German Aerospace Congress 2015 in Rostock

  • Stadthalle Rostock, Saal 2 (A) L2 0094 (map)
  • Google Calendar ICS

Presentation of the Flying V aircraft configuration at the German Aerospace Congress 2015, an event of the German Society for Aeronautics and Astronautics (DGLR).

Title:

The Flying V - A new aircraft configuration for commercial passenger transport

Abstract:

In this work an idea on how to efficiently use the volume inside a pure flying wing for commercial passenger transport was derived and a configuration proposal was made with this idea. This configuration was then compared with a reference aircraft.

The idea is to arrange two cylindrical pressurized sections for the payload swept back in the shape of a V and place them inside the front section of a wing with the same sweep angle.

The streamwise cut through the oblique pressurized section is flat and elliptical and thus, it fits efficiently into conventional airfoils. The cut of the pressurized section orthogonal to the leading edge however, is circular. This leads to an efficient structural solution as pressure can be preserved well in a cylindrical shape.

The proposed configuration is called the Flying V. For this configuration transition and outer wings extend the span of the highly swept middle wing at a lower sweep angle to 65m. The Flying V was designed in this work with a capacity of 315 passengers in a two class layout for a cruise speed of Ma=0.85.

The Airbus A350-900 has the same capacity and cruise speed and was chosen as a reference aircraft. Preliminary estimations made in this work indicate that the Flying V might have a benefit over the reference in terms of aerodynamics (10% higher L/D) and mass (2% lower empty weight). More qualitative arguments in favor of the Flying V which could be derived are the compactness and simplicity of the configuration (less parts, no high-lift devices, no fairings, straight lines) and the shielding of the engines from the ground (low noise). Remarkable is also the elliptical lift distribution of the naturally stable design using only a moderate wing twist and no reflexed camber lines. A radio controlled model of the Flying V will be presented in this work to demonstrate these aerodynamic characteristics and support the estimations and simulations which were made.

So far, the Flying V is an idea and everything which is presented in this work can be regarded as the first step of a long iteration which will be necessary to develop the concept further.

More information:

Read more about the Flying V aircraft configuration on this website.

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Feb
4
4:00 PM16:00

Presentation of the Flying V at the Seminar of Mechanics at the Technical University of Berlin

  • Technical University Berlin, M123, S. f. Mechanik (map)
  • Google Calendar ICS

First public presentation of the Flying V aircraft configuration.

Title:

The Flying V - An entirely new aircraft configuration - First public presentation

Abstract:

Outwardly, commercial passenger aircraft have changed little since the 1960s. The conventional configuration made up of wing, fuselage and tail assembly is the state of the art.

Recent preliminary calculations show, that a new configuration called the Flying V might have a potential benefit over the conventional configuration in terms of mass and aerodynamic efficiency.

This unconventional configuration will be introduced in the talk. Also, the first successful flights of a demonstrator model will be shown.

More information:

Watch a the trailer for the presentation here.
See the University's announcement here.
Read more about the Flying V aircraft configuration on this website.

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