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In recent years we have seen drastic improvements of the accuracy of wheel force transducer (WFT) systems /1, 2 and 3/. These systems in most cases are calibrated just statically. What is the dynamic behaviour of the sensor? What can we expect towards the accuracy of the measured loads on real road surfaces as they are influenced by a number of parameters? In the present paper quantitative results are reported out of a broad investigation of the effects of the following parameters road surface, rim stiffness, tire air pressure, velocity and wet road conditions. The unique Wheel and Tire Testing Vehicle (“Universal Skid Resistance Measurement Device”) of Stuttgart University was used for the measurements on two highways. The WFT-signals are referenced to the multiaxial force sensing of this vehicle. These findings are compared to results derived from a rolling road flatbelt test stand reported in /6/.

Since decades KISTLER is contiuously innovating in the field of piezoelectric sensor technology. This paper describes major technological progresses in the field of rotating wheel dynamometers: the six-component Rotating Wheel Dynamometer RWD and the Rotating Wheel Torque Meter RWT. First the systems are explained in detail, then outstanding applications in vehicle development, tire power loss determination and tire deformation investigation are given. An outlook on upcoming innovations concludes the paper.