In the field of Engine Acoustics, the FKFS is working on the following topics:

• Investigation and optimization of acoustic excitation by means of combustion and mechanics, such as valve gear, piston, crankshaft bearing
• Combustion noise optimization based on engine-specific structural damping
• Structure-borne sound excitation and flow
• Modal and operating vibration analysis
• Quantification (level, psychoacoustic characteristics) and subjective evaluation of noise emission of engines

The following measurement and analysis methods are used:

• Air and structure-borne sound measuring technology
  (microphones, artificial heads, acceleration sensor, scanning laser vibrometer)
• High- and lowpressure indication
• Noncontact measurement (eddy-current principle) of short paths
  (crankshaft shift, piston rocking, flywheel wobble, movements in valve gear)
• Rotational nonuniformity measurement and torsional vibration analysis
• Simultaneous digital measuring signal acquisition, time and crank angle-dependent, > 50 channels
• Common and special processes of digital signal analysis

Read more about the FKFS acoustics test benches