Fraunhofer LBF calibrates truck wheel force sensors with high loads: Page 2 of 2

May 02, 2019 //By Christoph Hammerschmidt
Fraunhofer LBF calibrates truck wheel force sensors with high loads
In recent years, the load ranges to be tested have increased significantly. The demands placed on the tests and the reliability of the test instruments used have increased accordingly. Therefore, the Fraunhofer Institute for Structural Durability and System Reliability LBF has developed a new test bench especially for the calibration of truck measuring wheels, which covers particularly high load ranges.

In contrast to the previous test rigs, only the sensor element is calibrated without the rim and tire. The LBF scientists screw the wheels over the wheel flange onto a lockable turntable. Instead of the rim, they attach a load introduction ring via which they introduce the loads in the directions to be tested. This is done at eight positions of the wheel circumference - not in combination, but one after the other. The loads are increased stepwise or continuously and recorded via a single force measuring element located in the direct load flow. A load calculation is not necessary. This increases accuracy and eliminates sources of error.

The new calibration test bench can be used to determine the sensitivity of the wheel force sensor in the radial, lateral and tangential load directions and to determine the measuring accuracy for each force component. The crosstalk between the determined load components is calculated. "Sensors should be calibrated at least every two years. This ensures measurement accuracy and identifies possible problems with the sensors," emphasizes Käsgen.

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