Suspension Motion Simulator

Functional characteristics

In order to meet the ever-increasing demands for full-vehicle models that are as realistic as possible and to analyse the interaction of the various vehicle components, a full-vehicle vibration test bench (suspension motion simulator, SMS for short) is in use at the IAD's Vehicle Technology Test Centre (FVZ).
This is a servo-hydraulic test bench which makes it possible to excite one axle of a 4-axle vehicle (x, y, z, steering angle) on the stationary wheel up to a frequency of 30 Hz. At the same time, the resulting 6-axle movements are measured at the tyre slack, at the wheel hub and at the body. The forces and moments are measured at the tyre slack and controlled if necessary. It is also possible to apply the excitation directly to the wheel hub instead of the tyre slack. For this purpose, a wheel replacement system is used which eliminates the influence of the tyre. 

Emphasis of tests

• Complete vehicle research on Kinematics and Compliance (K & C) - static and dynamic
• Parameterization and validation of simulation models
• Vibration and transmission behavior up to 30 Hz (driving comfort and driving dynamics)
• Determination of substitute spring rate and friction analyzes on the entire vehicle or on vehicle axles

Measured quantities

• All 3 forces and 3 moments on the wheel platforms of a vehicle axle
• Vertical forces on the wheels of the second vehicle axle
• Position of the wheels, the body, the movable wheel platforms
• Further measured variables are possible: More than 20 analog inputs can be freely assigned

Miscellaneous

• Investigations are possible with fixed and freely oscillating vehicle body
• By activating or deactivating individual forces, maneuvers are possible which cannot be realized in the real driving test (for example, driving along a curve without lateral force).

• This test bench is unique in the university sector. In combination with the other test benches of the IAD, there are therefore completely new possibilities for the definition of detailed vehicle models.

Downloads

Detailed testing stand documentation