Kistler has introduced the RoaDyn Racing wheel force transducer (WFT) for motorsport tire testing applications. It is a fully self-contained measuring wheel designed for teams, race car engineers and tire manufacturers. With an installation time of less than 60 seconds, the new device fits seamlessly into the wheel, requiring no external systems or complicated assembly.
The RoaDyn Racing wheel force transducer provides users with accurate data acquisition, providing critical insight into wheel forces and vehicle dynamics. Already used in GT3 and tested in Formula E, the RoaDyn Racing WFT is stated to improve performance development and is proven to withstand rough racing conditions.
Precise data collection is crucial to prevent tire blowouts, mechanical failures and accidents in motorsports that involve high speeds. By monitoring tire loads and behavior, engineers can optimize cars and ensure the safety of drivers and spectators, adapt their race strategies and obtain insights into vehicle dynamics such as balance and stability.
The WFT is designed with maximum usability in mind, eliminating the need to connect to the vehicle’s onboard system or external transmission modules that could compromise data integrity. The wheel force transducer stores data directly within the measurement device, enabling quick and easy downloads via USB.
In addition, mechanics can use a remote control to start measurement data acquisition from all four wheels simultaneously which simplifies work processes. Synchronization with the other measured values is realized by a trigger, which can be operated in both master and slave mode. Internal power is supplied by rechargeable batteries.
The system uses four temperature-compensated strain gauge load cells that measure forces acting on the wheel of up to 20kN wheel load. These sensors provide critical data on tire loads and tire behavior. The system also calculates all force and moment components within a rotating coordinate system, then seamlessly converts them into a non-rotating (fixed wheel) frame by applying the angular functions of the rotating angle. This complex process is handled in real time directly in the wheel force transducer, ensuring instant and accurate data. If required, the system also records individual forces. Precision is further guaranteed through the calibration of the sensors according to ISO 17025, using the Hexapod system from Kistler.
The WFT is made from lightweight magnesium or aluminum alloy structural components. It has been designed for durability and has undergone extensive rotational bending testing with over two million cycles at loads up to 5,000Nm and speeds of up to 360km/h.
The design features ring-shaped electronics that provide unobstructed access to the central nut, while the independent electronics simplify the installation process – enabling mechanics to install the device in less than 60 seconds.