AVL ROADSIM NVH 4x4 LIGHT TRUCK™ Chassis Dynamometer

It is designed for testing cars and light commercial vehicles in applications like NVH analysis.

AVL Approach

The cradle mounted AC motors are arranged beside the roller sets. Acoustic treatments like hydraulic bearing, enclosures, etc. reduce the acoustic emissions. The road load simulation uses the mechanical base inertia together with electrical inertia simulation.

Benefits at a Glance

  • Extreme low noise characteristic (hydraulic bearings, acoustic insulation, etc.)
  • Proven record of numerous installations worldwide
  • Excellent working relationship with all major chamber suppliers
  • Local service capability with short response time

Technical Data

The following specification shows typical values and is subject to change. Alternative technical configurations are available upon request.



Nominal tractive force in motor mode (per roller)

4,054N @ v≤120km/h

Nominal power in motor mode (per roller)

135kW @ v≥120km/h

Max. speed




Roller diameter


Distance between outer roller edges


Distance between inner roller edges


Wheel base

2,200mm … 4,200mm

Axle load


Max. axle load


Inertia simulation range


Inertia simulation range (2WD)

450kg … 5,400kg

Inertia simulation range (4WD)

800kg … 5,400kg

Measurement accuracy data


Tolerance of tractive force measurement

±0.15% of full scale

Tolerance of speed measurement


Control accuracy data


Tolerance of tractive force control

±0.2% of full scale

Tolerance of speed control


Road load simulation


Tolerance of inertia and road load simulation

±1% of calculated value (but not better than force control)


Measuring Principle

Tractive force
The tractive force is measured by a strain gauge sensor supporting the cradle mounted motor.

The speed is measured by an incremental encoder with two 90° shifted tracks with detection of the direction of rotation.