Acoustics

There are few annoyances that we are subjected to more often than disturbing noise. This will not be tolerated by the general public in the near-future.

Designing for more eco-friendly vehicles is now on the agenda for all manufacturers, both within Aerospace and Automotive.  Optimizing for fuel economy strongly impacts acoustics. The focus on lightweight structures and new materials such as composites dictate the acoustic performance. Design options for lightweight vehicles can result in degraded sound and vibration properties unless properly addressed.

Shortening development cycles, reducing design costs and improving product performances requires that correct design decisions are made early in the design process. Design solutions that make use of smart systems technology, require use of simulation-based optimization approaches to identify optimal configuration and control strategies.
















Applications

The coworkers in the acoustics team have extensive experience in working with a wide variety of projects.

Aerospace acoustics

  • FE-simulations of interior noise in coupled fuselage-cavity models for propeller or open rotor excitation.
  • Simulation and optimization of Active Noise Control configurations and Tuned Vibration Absorbers.
  • In-flight Noise & Vibration measurements and analysis.
  • Development of hot stream liners for jet engines.

Vehicle acoustics

  • FE-simulations of interior noise.
  • Noise & vibrations measurements and signal analysis using a wide variety of equipment and software, eg. LMS, Head, PAK, Prosig, B&K, Matlab etc. 
  • Simulation and optimization of Active Noise Control (ANC) configurations.
  • Integration and demonstration of concepts for ANC.

Acoustics in product development 

  • Simulations of noise and vibration characteristics.
  • Noise & vibration measurements and signal analysis.
  • Development of noise reduction measures, both passive and active control methods.

Noise scattering

  • Simulations of noise scattering using the Boundary Element Method (BEM) coupled with ray tracing for high frequencies.

Possible applications include:

  • Calculation of SPL from aircraft, both at ground level and in the cabin, with included fuselage shielding effects.
  • Determination of noise levels from helicopters and aircraft in varying terrain to aid in choosing optimal route to minimize ground noise exposure in civil and military applications.