ATRA functional model

ATRA functional model
Image: 1/3, Credit:
ATRA functional model at exhibitions
Image: 2/3, Credit:
The DLR research aircraft ATRA
The Airbus A320-232 D-ATRA is the model for the detailed replica as a functional model.
Image: 3/3, Credit:

Lower emissions and quieter flying

Retrofittable aircraft noise reduction technologies and extraction systems for greater efficiency

Aircraft noise research is an important focus of DLR's aeronautics research; the reduction of aircraft noise is a global political goal. At the same time, aircraft should become more climate-friendly and efficient. Our institute is tackling these challenges together with other DLR institutes, research organisations and industry.

In our DLR project LNATRA (Low Noise ATRA), we succeeded in reducing the aircraft's noise emissions by up to 3 dB by using eight retrofittable noise reduction measures on the landing gear, high-lift system and engine thrust nozzle. Some of the work on aircraft noise research is illustrated using our model - a technically highly detailed replica of DLR's largest research aircraft, the A320-232 "D-ATRA":

  • Fairing on the new thrust nozzles (Nozzle Guide Elements)
  • Modification to reduce noise on the slat (Slat Horn Filler)
  • Filling of the gap between the wing and rear flaps (Splitter Plate)
  • Modification of the flap side edge (Porous Flap Side Edge)

In addition to aircraft noise reduction technologies, the model provides an insight into current research work on hybrid laminar flow control (HLFC). With this technology, parts of the air flowing around the aircraft are extracted through tiny holes in the outer skin of the aircraft surface so that the flow close to the surface remains laminar, i.e. with low friction. A vertical stabiliser with a simplified suction system was tested in flight trials as part of the EU AFLoNext project.

Flying research platform as a model

In order to visualise the diverse missions of the DLR research aircraft, A320-232 "D-ATRA", a technically highly detailed model of the ATRA was created with almost 400 variable individual components. Designed as a modular functional model, all components can be exchanged. The "real" ATRA research aircraft has been in use at DLR since 2008. With a length of 37.57 metres, a height of 11.76 metres and a wingspan of 34.10 metres, the ATRA (Advanced Technology Research Aircraft) flight test platform has set a new benchmark for flying test vehicles in European aviation research.

Technical details at a glance

Scale of the model: 1:13.6

Dimensions of the exhibit:

  • Length: 280 cm
  • Width: 250 cm
  • Height: 90 cm
  • Weight: 97 kg
  • Individual parts: 395
  • Manufacturing process: 9

Further links:

The DLR research aircraft ATRA

Project LNATRA

Retrofit technologies significantly reduce aircraft noise