Acoustics and vibration technology

Quiet and light

© Jürgen Lösel/Fraunhofer IWU

The Fraunhofer IWU has extensive experience in the field of technical acoustics and uses various methods of analysis and acoustic measurement technology for solving diverse tasks.

  • Adaptive spindle holder for vibration compensation in machine tools
  • Active absorber for wind energy plants
  • Compensation of axial vibrations in the powertrain of feed axes
  • Lightweight cardan drive shaft
  • Searching for quiet tires
  • Noise reduction in car rear axle transmissions
  • Improved gear acoustics due to gear rolling

Application examples for microphone array process

  • Noise optimization in mopeds
  • Detailed investigations of the noise radiation of closing noises

  • Noise reduction and elimination of background noise in automotive engineering
  • Design of a noise characteristic specific to a particular car and customer (sound design) in serial production
  • Tendency towards lighter and more material-saving designs influencing the vibration behavior of a structure
  • Measures for optimizing noise early in the design process

  • Simulation and experimental analysis regarding topics of transmission and gear acoustics
  • Simulation and experimental analysis of acoustic behavior of electric drives
  • Calculation and measurement of structure-borne noise and airborne noise
  • Analyzing origination, transmission and radiation of noise
  • Development and implementation of passive and active solutions for noise and vibration reduction 

Array measurement technology

  • Beam forming arrays: 90 channel full circle array (d = 1.05 m) and 90 channel semi-circle array for large objects of investigation (d = 3 m)
  • Acoustic holography (NS-STSF / SONAH): 96 channel arrays with 5 cm and 15 cm lattice constant
  • 105 channel transportable measurement system Brüel&Kjær PULSE
  • Anechoic room (semi-free-field room class 1)

Transfer path analysis (TPA)

  • Modular Brüel&Kjær measurement system PULSE (up to 150 channels)
  • Accelerometers and microphones in diverse versions
  • Impulse hammers and electrodynamic vibration machines in several dimensions
  • Anechoic room (semi-free-field room class 1)
  • Electrodynamic vibration test station
  • TPA software by Brüel&Kjær for modeling and analysis
  • Volume sound source (5 Hz – 5 000 Hz)

Vibration measurement

  • Multiaxial vibration test station: 4 electrodynamic vibration machines that can be positioned arbitrarily, each with a nominal force of 8,000 N
  • 3D scanning vibrometer
  • Rotation vibrometer
  • 3D plane mirror interferometer
  • Modular Brüel&Kjaer measurement system (up to 150 channels)
  • Laser triangulation sensors
  • 48 channel LMS measurement system

Further equipment

  • Evaluation in time and frequency ranges; geometry scanner, strain measurement, video triangulation
  • Sensors for determining various mechanical and acoustic values
  • Acoustic semi-free-field room