All-wheel drive chassis dynamometer

Vehicle acoustics at the highest level: Precise measurements in the acoustic semi-anechoic chamber

The semi-anechoic chamber with all-wheel drive chassis dynamometer at Fraunhofer IBP provides a state-of-the-art environment for conducting detailed acoustic tests on vehicles. This testing facility makes it possible to realistically simulate driving conditions for cars, vans and motorcycles in order to accurately measure both interior and exterior noise. Among other tests, we use the facility to carry out simulated pass-by noise tests according to ISO 362-3 and UN-ECE R51, in which the exterior noise is measured at a defined distance. In addition to a Safety-Walk™ surface, rough asphalt surface elements or impact bars can be installed. Thanks to a versatile pallet changing system, vehicles can be efficiently prepared for decoupling studies, for example, or to mount sensors. The facility also boasts a fully-equipped workshop with lifting platforms, tire fitting and wheel balancing stations, as well as a fast-charging station for electric vehicles.

Customers who choose to work together with the Acoustics department at Fraunhofer IBP benefit from decades of experience and extensive know-how in vehicle acoustics. Our tailor-made solutions help to optimize the acoustic performance of vehicles, resulting in improved product quality and customer satisfaction. This not only facilitates compliance with international standards, but also offers a competitive advantage through innovative approaches to sound measurement and analysis.

How can we help? Find out more about our range of services now or send us an e-mail.

Technical specifications

© Fraunhofer IBP
Open interior noise pallet with recesses for pit lift.

© Fraunhofer IBP / Benjamin Müller
Fast charging station for electric vehicles in the preparation room of the vehicle acoustics laboratory.

Tire changer for standard, low-profile, UHP and run-flat tires with German Rubber Industry Association (WDK) Certificate.

Semi-anechoic chamber

Lower cut-off frequency 40 Hz
Chamber size: 25 m × 18.9 m × 6 m (L × W × H)

Awd chassis dynamometer

Four independently driven rollers
Roller diameter: 1.90 m (75”)
Traction per roller: 7,500 N
Electric drive: 4 x 300 KW
Test velocity: 0– 320 km/h
Precise roller synchronization: deviation max. 0.05 km/h, per axis max. ± 1 mm
Roller width: 550 mm
Gauge: 1100 mm
Airstream: 20-100 km/h, speed controlled, min. 7,000 m³/h, max. 42,000 m³/h, inflow height max. 800 mm
For vehicles with
- a total mass of up to 4 t
- a max. axle load of 2 t
- a wheelbase of 2,200 mm to 4,000 mm

Simulated pass-by tests according to ISO 362-3 / UN - ECE R51

PAK measurement system with 2 x 32 microphones
For external noise emissions from class M1 and N1 vehicles

Interchangeable surfaces

Safety-walk^TM
Rough asphalt replica
Impact bars: 20, 15 and 7.5 mm

Delivery zone

Unloading station suitable for prototype trucks
Entrance to testing facility 3.4 m × 3.4 m

Equipment and evaluation

Two independent, lockable evaluation rooms, equipment stations with lifting platform

Fast charging station for electric vehicles

Total output of 150 KW to supplement existing AC wall boxes
5 m-long cable with CCS (for currents up to 400A) and CHAdeMO plug (for currents up to 125A)

In-situ tire changes

Tire changer for standard, low-profile, UHP and run-flat tires with German Rubber Industry Association (WDK) Certificate
Suitable for motorcycle rims right up to wide tires with a width of over 300 mm
Professional tire balancer for dynamic balancing with laser positioning system and LED light

Measuring equipment used

PAK measurement system for simulated pass-by tests
Head-Lab / Artemis
Binaural dummy head measurement technology and analysis
Acoustic camera (Head Visor)
Scanning vibrometer (Polytec)
Microphones and acceleration sensors
Measuring systems for material parameters:
- Normal sound absorption coefficient (impedance tube)
- Airflow resistance
- Dynamic stiffness
- Modal analysis