To analyze your acoustic problems the Gesellschaft für Akustikforschung Dresden mbH applies the measuring system AcoustiCam® and measures in situ. The system both creates acoustic mappings of your test objects and identifies important sound sources with their properties. To visualize the sound field, an optical photograph of the test object can be laid underneath the localization result.

Wide range of applications:
There are a lot of applications for the localisation of sound sources with the help of a microphone array. Especially in the industry, for the development of vehicle, machines and devices this method can be of great use. Examples are among other things:

• Localization and separation of sound sources as a requirement for noise control
  for
  • vehicles and their components (e.g. engine, exhaust system, compartment)
  • placement machines and production machinery, machine tools
  • generators and turbines
  • power tools and electrical domestic devices (e.g. compressor, vacuum cleaner)
• Analysis of sound sources as a basis for acoustic design
  for
  • structures or scale-model structures in airflow in the wind tunnel (e.g. wing profile of an airplane, pantograph, side-view mirrors of cars)
  • complex vibrating structures (e.g. floor section of a car)
  • squealing or rattling structures (e.g. car brackets)

• Determination of characteristic properties of sound sources and their source mechanisms
  for
  • electroacoustic transducers (e.g. multi-channel loudspeaker)
  • aerodynamically influenced objects (e.g. antennas, roof systems)
• Acoustic search for leakages
  in
  • (vehicle-) doors, windows, etc.
  • pipelines

Your advantages:
During the development of the AcoustiCam® we attached great importance to the optimization of the microphone array and the subsequent signal processing. This results in numerous advantages, for example:

• fast measurements, at great distance as well as in close proximity to the test object due to the  application of the near field beamforming algorithm,
• separate localization and analysis of sound sources and source mechanisms due to a novel orthogonal beamforming algorithm,
• localization results with high spatial resolution and great  dynamic range due to two numerically optimized microphone configurations, one for broad-band and one for narrow-band/tonal sound sources respectively,
• special test environment behind the microphone array usually not necessary due to the application of a so-called boundary layer array.

Consulting:
Besides a detailed documentation of the investigations, we provide you with our expertise to solve your acoustic problems. Furthermore, we develop solutions for the measurement with microphone arrays adjusted to your requirements.

Top: Localization of sound sources of a cleaning machine: The main sound sources are dependent on the operating state. In this case the brush, the broom and the engine dominate.
Center: Localization of sound sources of a helicopter`s airfoil modell NACA0012 in airflow 
Bottom: Sound pressure spectra of different source areas of a cylinder in airflow