Header: NVH Testing

NVH Testing

Our range of extreme low noise NVH Chassis Dynamometer systems have evolved and acquired techniques and capabilities previously only demanded in “high accuracy” emission test systems.

With continuous development of motor vehicles comes the demand for ever-improving product refinement. An increasingly significant area of this important work is passenger safety and comfort. The measurement and evaluation of vehicle noise, vibration, and harshness levels is subject to the variations in road and climatic conditions. By using a chassis dynamometer within a semi-anechoic chamber, the difficulty in monitoring these parameters under controlled conditions an be overcome.

We produce specialist chassis dynamometer designs which allow investigation of NVH levels whilst the vehicle is running under accurate and repeatable road load simulation, speed, force, or acceleration control.


Our NVH chassis dynamometers are available as standard in single roller, 2WD, 4WD and 4×4, and independent configurations.

The rollers are available from 1.8m to 2.5m in diameter, running in hydrodynamic or roller element bearings. The roller assemblies are acoustically attenuated to minimise the effect of noise generation and amplification. They can be either coated to represent a road surface or fitted with interchangeable road surface simulation shells.

Trunnion mounted motors compensate for system losses and simulate road load forces, vehicle inertia and gradients. These motors are installed in isolated areas and connected to the rolls by torsionally tuned couplings and drive shafts. Acoustic shaft seals, roll covers, and breakthrough seals around the rollers ensure effective noise containment. Wheelbase adjustment is available to accommodate different vehicles. Roller centres can be set automatically as part of the road load model information, or set to the user’s specific dimensions. The dynamometer baseframe is mounted on a moving carriage.

The test bench is equipped with the PAtools real-time system and a distributed I/O architecture.

Typical Specification

Speed range  280 km/h
Absorption power per axle278 kW
(100 - 280 km/h)
Force per axle10000 N
(0 - 100 km/h)
Inertia simulation range600 - 5400 kg
Wheelbase adjustment2260 mm - 4700 mm
Roller diameter72" (1828 mm)
Width24" (610 mm)
Spacing40" (1016 mm)
Acoustic performance at 100 km/h45 dBA (typical)

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Chassis Dynamometer suitable for different applicationsChassis Dynamometer suitable for different applications