Project description
Tackling the noise within aircraft
Is there a way to tackle noise inside tiltrotor aircraft? The lack of acoustic comfort in the passenger cabin is a demanding and challenging issue in this kind of aircraft. The EU-funded project, PIANO, aims to make progress on this question by bringing together Advanced Transfer Path Analysis (ATPA) and Active Noise Control (ANC) technologies. ATPA will be applied to get thorough knowledge of the vibro-acoustic characteristics of tiltrotors. Prior to this, a clustering technique will be implemented to divide the tiltrotor into a set of vibro-acoustic subsystems. Based on the outcomes of the ATPA, innovative ANC techniques will be applied to reduce tonal and broadband noise at a reasonable cost, while keeping an eye on the aircraft weight.
Objective
Interior noise in tiltrotor aircrafts is becoming more and more important. Customers are more aware of noise as a key element for comfort and health. This project aims to investigate two topics to further deepen the analysis and the improvement of interior noise in civil tilt rotors.
The first topic is the Advanced Transfer Path Analysis application in a tiltrotor. ATPA is a powerful analysis method to quantify noise and vibration paths in a complex structure, as well as differentiate air-borne from structure-borne paths.
Currently, simulation models based on SEA are widely used to predict aircraft interior noise. The accuracy of the input model parameters has a direct impact on the model results. The knowledge on how to model junctions is a key point to obtain a realistic model. The experimental characterization of the aircraft through ATPA has the objective to deduce the SEA factors.
As a first step, prior to the paths identification, the complex system has to be defined as a set of subsystems. A clustering technique based on the DTF matrix is proposed here, with the aim of dividing the studied system in vibroacoustic subsystems. Once the subsystems are well-defined, ATPA will be experimentally applied. This will provide a deep characterization of the system from a vibroacoustic point of view and will be used as input for SEA factors derivation.
The second topic is the mitigation of tonal noise through innovative active noise control techniques. Low frequency and tonal noise sources are difficult to be improved with classical passive solutions. Nowadays, ANC systems may reduce noise both locally or globally. Innovation is centered in achieving a remarkable reduction of tonal noise, without increasing too much weight and at a reasonable cost. A complete definition of the architecture and the components ready to be installed will be supplied.
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Funding Scheme
RIA - Research and Innovation actionCoordinator
08035 Barcelona
Spain
The organization defined itself as SME (small and medium-sized enterprise) at the time the Grant Agreement was signed.