NVH Simulation

While strength and durability limits are being pushed further and further, requirements for noise reduction are becoming more stringent. In addition, focus is increasingly being placed on transmission and powertrain noise because other sources could be reduced meanwhile.

Major noise sources in powertrains include clearances in cranktrain bearings, piston liner contacts and contacts in valve trains, timing drives and transmissions. Simulation allows individual mechanical noise sources to be localized and represented very accurately.

The elastic multi-body dynamics solution AVL EXCITE™, connecting FE-based flexible bodies via non-linear contact joints, enables the investigation of all noise phenomena of engines and transmissions including gear rattle, gear whine, chain noise and specific phenomena in the driveline. For the large amount of resulting structure-borne noise data from the acoustic analyses, an automated and compressed result evaluation is provided to support decisions related to the optimization of the design.

Using previously calculated structure-borne noise as input EXCITE™ Acoustics efficiently calculates sound radiation and provides airborne noise results which are directly comparable with measured acoustic data and legal noise limits.

AVL BOOST™ offers linear acoustics (simulation in frequency domain) and non-linear acoustics (simulation in time domain) modules for the simulation of transmission loss, linear and A-weighted sound pressure levels, free field and in-duct acoustics, intake and/or exhaust orifice noise as well as octave band analysis.

Key Benefits

  • Real life conditions for precise results
  • Powertrain oriented solution
  • Multi-level simulation models
  • Whole workflow covered including sound radiation calculation