TIMPAN - Technologies to IMProve Airframe Noise
Overview
Background & policy context:
During the last decades, the replacement of older jet-powered aircraft by aircraft with high bypass ratio engines, progressively encompassing efficient acoustic design rules and noise reduction technologies, has significantly reduced the noise impact from individual aircraft operations on communities near airports. However, the continuous growth in air traffic makes it is necessary to achieve further noise reductions to ensure the air transport industry's sustainable growth.
In the report, European Aeronautics - a vision for 2020, a group of people gave their view on the future of air transport: challenging noise reduction targets were defined; perceived noise levels must be reduced by 50%, i.e. -10 dB per aircraft operation by 2020.
To achieve such reductions, all fields of investigation have to be pursued simultaneously by reducing the noise at source: use new configurations with profitable installation effects and improved aircraft procedures around airports so as to limit the noisy areas to airport boundaries. In recently designed aircraft, contributions from airframe noise (mainly due to the interaction of the airflow with the aircraft airframe) and engine noise sources to the overall aircraft noise are quite balanced at approach.
The approach noise source reduction challenge has to be addressed by reducing airframe noise to the same level as engine noise. Dominant airframe noise sources, which are due to the deployment of both high-lift devices and landing gears, are to be considered.
Objectives:
TIMPAN addressed airframe noise by tackling both landing gears and high-lift devices, which are the two main contributors to approach airframe noise. The investigations planned in TIMPAN are:
- the development and assessment of innovative technologies for airframe noise reduction application: a breakthrough technology for source noise reduction is required to meet the long-term objectives. TIMPAN will rely on state-of-the-art research findings of disciplines way beyond the aero-acoustics domain.
- the improvement of low-noise designs, for generic aircraft components, which will take results from previous research investigations, such as EC (RAIN, SILENCE(R)), national or company-funded research projects linked to airframe noise investigations. They will target shorter-term objectives.
These investigations focussed on principles and will be applicable to any type of commercial/business aircraft, including new configurations such as those developed in NACRE. Furthermore, the approach proposed in TIMPAN includes a performance, cost and integration assessment of the technologies with multidisciplinary evaluation.
Methodology:
TIMPAN was organised into three main work packages:
A. Landing gear noise reduction
B. High-lift device noise reduction
C. Technology evaluation
In both technical work packages (A) and (B), the work was split between the proof of concept of innovative technologies and the improvement of current State-of-the-Art low-noise design.
Various innovative technologies were investigated, including plasma actuation, air blowing, use of meshes for landing gear, and slat-less configurations and flow control techniques for high-lift devices. All these activities, led by research and academic partners, were achieved in parallel, and concluded with laboratory tests to measure their noise reduction efficiency.
The conventional design tasks include, in addition to research and academia, the airframe noise partners from industry. On landing gear activity, it was planned to use the Silence(R) advanced gear as a basis and improve the design, in particular treating the currently noisier systems. The advanced design for high-lift devices concerns the wing leading edge acoustic liner and the aero-acoustic design process of a high-lifted configuration.
Transversally, the technology evaluation was performed, specifying the needs in terms of integration, cost and performance, and analysing the results at aircraft scale, if relevant, with the use of three virtual aircraft platforms.
Share this page