With the increasing demands of motorists regarding comfort inside cars and the more stringent legal framework conditions for vehicle noise emissions, the requirements placed on engine acoustics have also become stricter. After all, the engine has a significant influence on driving noise alongside wind and rolling noise. Measures for reducing fuel consumption such as turbocharging, downsizing, lightweight construction and new combustion processes can exacerbate this: they can lead to increased vibrations and oscillations, influencing both the acoustics and the dynamics of the engine. Therefore, the researchers and developers of this planning group focus on the question as to how efficient driving and pleasant engine acoustics can be brought into harmony.

Furthermore, the FVV engineers are investigating how the dynamics of highly efficient combustion engines can be optimised still further by examining all the mechanical components of a combustion engine that influence the torque on the crankshaft and therefore the drive behaviour.

Alongside calculations and simulations on a computer, the work performed on the test bench is especially important when researching engine acoustics and dynamics. The specific fields of research tackled by the planning group include the acoustic design of exhaust gas turbochargers, modelling the damping properties of operating fluids or the dynamics of valve and timing gears.

The electrification/hybridisation of the powertrain presents additional challenges for the developers of engine acoustics and dynamics.
 

PG5 »Engine Dynamics & Acoustics« is dedicated to the following topics:

• Efficiency of the engine
• Dynamic and acoustic behaviour of new powertrain variants / operating strategies
• Hybridisation

And tackles the following lines of research / focuses:

• Acoustic behaviour of powertrain components
• Interferences
• Vibration damping
• Detecting acoustic phenomena in conventional and new powertrain variants