Design of the RoaDyn S615 is based on a three load cell concept. Saving one cell and its mounting screws shaves 400 g off the weight of the established RoaDyn S625 lightweight wheel force transducer system. There is another potential saving of 400 g available in the design of the inner part, whose CFRP construction offers a reduction of up to 20 % compared with the RoaDyn® S625. The optimized design of the RoaDyn S615 allows a maximum vertical load Fz of approximately 15 kN.
The tried and tested CFRP/aluminum composite rim has been adapted to suit the RoaDyn S615 configuration. It consists of an aluminum rim ring and matching wheel disk manufactured from carbon fiber reinforced plastic. The positive and frictional connection of these components ensures great strength. The inner part represents the connection with the hub and is also made of CFRP. The three load cells connect the rim to the inner part. To minimize local stresses all of the relevant components were optimized using the finite element method (FEM).
The RoaDyn S615 is mounted on the vehicle as a complete wheel. It measures the three forces Fx, Fy, and Fz and the three torques Mx, My and Mz on the rotating wheel. The measurement signals are converted into digital form in the actual wheel electronics and transmitted to the on-board electronics by means of the inboard telemetry. In the electronics they are transformed into the vehicle coordinate system and output as analog or digital signals. The components needed for over-the-road measurement, such as wheel and on-board electronics, telemetry and adapters, are fully compatible with RoaDyn® family of products from Kistler.
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