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of a large number of electrode pairs with reflecting and directing elements combined into one solid unit
with small distances between electrodes. Principle advantages are the capability to generate pressure fields
of high intensity, higher accuracy of pressure distribution, energy savings, and also capability to operate with
small number of high-voltage capacitors. Though the highest efficiency is obtained when each electrode pair is
equipped with its own capacitor’s bank, the practical tests showed that the most of sheet components could be
formed at high efficiency with number of discharge circuits equal to 60-70 % number of electrode pairs.
High pressure intensity is assured not only high density of energy per area unit, but also by non-linear effects of
compressive waves interaction. Higher controllability of pressure fields is insured by discharges at those electrodes,
which are necessary for certain configuration. Electrodes are connected with special switches in order to
provide proper diagram of loading (impulse pressure field).
Vast experimental investigations allowed obtaining rich results for development of approximation relationships
and simulation of pressure loading fields at any arbitrary configuration of connected (working) electrodes.
Measurements were carried out with multi-point membrane pressure gauges (MMPG). Deformation of metallic
membrane in each point (hole) is proportional to the pressure intensity applied to the membrane.
Calculations with simulation program and experimental forming tests confirmed high efficiency of MDB in
application for typical aircraft sheet components of middle and large sizes. Now the researches are conducted
for further MDB improvements, modifications to combine advantages of both traditional hard punch-and-die
and electrohydraulic impulse forming for deep drawing processes, punching of small-diameter holes and perforations,
as well as for improvements of simulation computer program.
33
Title: Improving Aircraft Passenger Seating Comfort by Comfort Elements and Seat Design
Authors: Dr S. Frohriep, J. P. Petzel
Leggett & Platt Automotive Europe
Time: November 4, 2009 2:40 pm
Room: Candela
Passengers in airline seats are restricted to a narrow space and limited in their possible sitting positions. Thus,
they are in a static situation with potential health risks. Passengers now used to adjustability options in personal
vehicles and home furnishing are less and less willing to accept static aircraft seating with a pre-determined
contour that fits only a margin of its users, a trend that is called “amenity transfer”.
To improve passenger comfort and health, contour changes of seats should be enabled, possibly with motile
elements to enhance dynamic sitting. This paper will present electro-mechanical and pneumatic solutions for
seat contour adjustment. Muscle relaxation, pain relief and increased blood circulation are established physiological
effects of motile seat elements especially relevant for long durations of immobile positions. Passively
moving the contact area between occupant and seat has positive effects for persons with back problems, and
it entails positive effects for healthy individuals in improving well-being.
Concerning microclimate, a material make-up that supports air flow and humidity transport away from the
occupant is to be offered. Due to an open surface, higher transmissibility and moisture transport, fiber offers
a better climate in the contact area between seat and occupant. The immediate contact feel offers comfort
in warm and cold climate, especially important for aircraft use with changing climatic conditions before and
during the flight. A new fiber shaping technology will be introduced that features the possibility to shape the
3D contour of fiber pads. An additional advantage, especially for aircraft industry, is the approximately 40%
weight saving of contoured fiber pads compared to foam.
At Leggett & Platt, computer tools are employed to assess seating comfort with occupants constituting the complex
interface. Research results are continuously incorporated into the process of seat comfort element design.
“Measurable comfort” has been implemented in defined procedures of product development. This process is
applicable to automotive applications for which it has mainly been developed and aircraft seating comfort.
Title: Aeroservoelastic Design and Certification of a Combat Aircraft
Authors: W. Luber
EADS-M
Time: November 4, 2009 3:00 pm
Room: Candela
The aim of the aeroservoelastic flight control system design for an advanced military weapon system is mainly
to avoid interaction between structure and flight control system.
The design strategy of the advanced flight control system development is important through the integrated
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