Browse Publications Technical Papers 2005-01-0857
2005-04-11

An Evaluation of the Mechanical Properties of Wheel Force Sensors and Their Impact on to the Data Collected During Different Driving Manoeuvres 2005-01-0857

Six-component wheel force sensor (WFS) systems have become an important tool for many different applications in vehicle development - particularly for road load data acquisition and road simulation in durability engineering. All known measuring wheel concepts integrate single or multiple sensors into a modified rim. It is obvious, that this modification leads to a more or less severe change of important mechanical properties compared to a standard aluminium or steel rim.
The following paper will summarize the results of a comprehensive investigation of the influence of different mechanical properties and their impact on test data. The basis of this research will be a set of standard analyses and experiments, e.g. determination of natural frequencies, stiffness and mass/inertia performed with standard aluminium and steel rims as well as a typical light-weight measuring wheel with and without tyre. The comparison test data from several driving manoeuvres and events shall show the influence of these mechanical parameters on the dynamic behaviour of the vehicle.
Through careful research and testing several differences in the dynamic behaviour of suspensions with and without measuring wheels have been investigated. It is important to note that measurements of these differences have illuminated variations beyond changes in observed magnitudes. They extend to shifts in resonances, phase relationships and transfer functions. As a result they may have non-trivial affects on fatigue and durability in certain test - affects that are often overlooked.

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