Virtual Vehicle

NVH & Friction

NVH & Friction

The Area NVH & Friction deals with the fields of Noise, Vibration and Harshness (NVH), as well as the determination and reduction of friction loss in the vehicle. Within the context of ever-increasing system complexity, this area seeks to provide solutions to help meet the growing demands for drive systems with recuced consumption and emissions and lower weights, all while maintaining (or even improving) passenger comfort.

The research focus is on the areas of:

  • NVH Material & Technology
  • Vehicle Noise Reduction
  • Friction Loss & Vibration Reduction
  • Flow Acoustics
  • Testing & Measurement

In combination with the other aspects of the full vehicle, these issues form an essential keystone in the development of future vehicle concepts.

NVH-Material & Technology

New materials with optimized damping properties are improving the NVH properties of future vehicle concepts. In research and development, a stronger focus is currently being placed on materials for lightweight bodies in hybrid technology, such as aluminum, magnesium, titanium, high-strength steels, CFK and organic sheets. This will enable the meeting of future requirements, such as less mass, more security, increased consistency and improved comfort. New simulation methods are required for the virtual design of lightweight bodies with regard to fatigue strength and vibration behavior (bending, torsion). Future thematic research works will also concentrate on non-destructive damage detection of fiber-reinforced plastics using acoustic measurement technology....Further  Informationen

Vehicle Noise Reduction

Conventional drive concepts still have a great potential for further development in order to meet the high requirements in terms of fuel consumption and emissions. Virtual development methods make an important contribution, since they can represent future product requirements faster and at lower costs. The drivetrain must be intensively observed in the early development stages, taking into account the requirements of the full vehicle. In this context, one important goal is to analyze the acoustic images of the complete work using simulation models. Methods for the characterization and reduction of interior and exterior noise are still very relevant. The acoustic calculation of a complete vehicle requires the combination of different disciplines (e.g. the calculation of the vehicle body and its coupling with the vehicle interior considering its absorption properties). Current, rapidly progressing developments in the field of electrification of the drivetrain involve additional challenges due to the increasing complexity, greater number of variants, and the need for more interdisciplinarity and improvement of the consistency in the development process...Further  Informationen

Friction Loss & Vibration Reduction

Reducing friction power losses in engines is always an up to date topic to meet increasingly strict fuel efficiency targets. However, not only the amount of friction plays a crucial role in this context, but also its quality, that is whether harmful metal-metal contact occurs. State-of-the-art simulation methodology combined with extensive experience related to automotive multigrade lubricants allows accurate and reliable predictions of the lubrication conditions in the piston assembly, journal bearings of the crank train and many more. Detailed validations with experimental data confirm that the in-house developed simulation methods are indeed highly capable and provide a solid basis for further optimizations... Further Informations

Flow Acoustics

Reducing mass and cubic capacity while maintaining performance is called downsizing. This can be implemented by reducing the number of cylinders and turbo charging, for example. The reduction in the number of cylinders and optimized combustion processes, in combination with turbo charging, alters the NVH behavior of the entire vehicle significantly. This requires new methods and technologies for downsizing concepts with suitable vibration comfort and acoustic behavior. The acoustics of intake and exhaust systems represent an important aspect in the context of downsizing. A core competency in the field of Flow Acoustics at the VIRTUAL VEHICLE is the accurate prediction of the intake and exhaust noise of turbocharged engines based on improved simulation methods for the individual components, such as the turbocharger, muffler and exhaust after-treatment...Further Information

Testing Center & Measurement Lab

The VIRTUAL VEHICLE operates numerous test benches: The engine test bench is an acoustic full-space for the measurement of vibration, sound insulation and emissions of internal combustion engines in operation. Vibration and sound radiation of drivetrains are measured at the drivetrain test bench, designed as an acoustic half-space. The natural frequencies and natural modes of complex structures (e.g. of the body), which can be measured on the model analysis test bench, are made available for simulation for "Model updates", for example. Both the engine friction and the input of components (pistons, bearings, etc.) for the total friction can be determined on the friction test bench. The Soundbrick is a reverberation chamber similar to a vehicle in which material properties (e.g. sound insulation and absorption coefficients) can be measured...Further Information