ADOCHA

Acoustic Design Of High-lift Architectures

Coordinatore	AIRCRAFT RESEARCH ASSOCIATION LIMITED    more  Organization address address: Manton Lane city: BEDFORD postcode: MK41 7PF contact info Titolo: Dr. Nome: David Cognome: Lawrie Email: send email Telefono: -325838 Fax: +44 23 80 592195
Nazionalità Coordinatore	United Kingdom [UK]
Totale costo	200˙001 €
EC contributo	150˙000 €
Programma	FP7-JTI Specific Programme "Cooperation": Joint Technology Initiatives
Code Call	SP1-JTI-CS-2009-01
Funding Scheme	JTI-CS
Anno di inizio	2010
Periodo (anno-mese-giorno)	2010-01-01   -   2010-11-30

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	AIRCRAFT RESEARCH ASSOCIATION LIMITED  Organization address address: Manton Lane city: BEDFORD postcode: MK41 7PF contact info Titolo: Dr. Nome: David Cognome: Lawrie Email: send email Telefono: -325838 Fax: +44 23 80 592195	UK (BEDFORD)	coordinator	123˙750.00
2	UNIVERSITY OF SOUTHAMPTON  Organization address address: Highfield city: SOUTHAMPTON postcode: SO17 1BJ contact info Titolo: Dr. Nome: Malcolm Cognome: Smith Email: send email Telefono: 44 2380 592337 Fax: + 44 23 80 592195	UK (SOUTHAMPTON)	participant	26˙250.00

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 Obiettivo del progetto (Objective)

'Regulation of the sound production of aircraft is becoming stricter, in part due to an increase in the noise generated due to the rising numbers and size of aircraft. As a result identification and reduction of the major sources of sound, particularly in the take-off and landing phases when the aircraft is close to population centres, is paramount. High lift devices, particularly during the landing phase, are a major source of airframe noise. As a result there is a requirement for a tool to allow the acoustic properties of a high-lift configuration to be determined buring the design process. The purpose of this proposal is the development of such a tool.'

Introduzione (Teaser)

Noise reduction is a key focus of aircraft design. EU-funded scientists developed a novel software tool for predicting the self-noise generated by high-lift devices in the early-design phase.

Descrizione progetto (Article)

Regulation of noise pollution produced by aircraft or its components is becoming stricter.

Noise-reduction methods after aircraft design or production are labour intensive and costly, often compromising on aerodynamic performance.

Hence, it has become imperative to assess the noise performance of configuration architectures in the early stages of development.High-lift devices are a major source of airframe noise.

The EU-funded project 'Acoustic design of high-lift architectures' (ADOCHA) developed a tool for determining the acoustic properties of high-lift configurations during the design process.Focus was laid on providing a fast and robust method for predicting aerofoil self-noise as industry requires short turnaround times, typically less than 12 hours.

For this reason, scientists demonstrated the relevance of steady-state Reynolds-averaged Navier-Stokes (RANS) approaches to describe the turbulence flows.

To shed further light on the source of broadband noise, steady-state RANS was used in conjunction with another turbulent model (stochastic noise generation and radiation).The developed tool relies on the boundary element method (BEM) that works by constructing a 'mesh' over the modelled surface.

There was no need to discretise the volume of multi-component geometries in meshes.

BEM involved noise propagation in the far field.

It was used to compute the root mean square of acoustic pressure, spectral density and sound pressure levels at arbitrary observer locations.ADOCHA greatly contributed to the ambitious goal of the Advisory Council for Aviation Research and Innovation in Europe (ACARE) to reduce external noise by 10dB for future regional aircraft.