Adaptronic Actuator to Minimize the Pins Misalignment on Pin-on-Disc Testers 2018-01-1892
The Automated Universal Tribotester (AUT) represents a fully automated reduced scale brake dynamometer and was developed by the Institute of Dynamics and Vibrations at TU Braunschweig. The setup is based on the pin-on-disc principle. The downscaled test specimen is brought to contact to the disc, loaded and guided via the load unit, which was specifically designed for this purpose. It is laid out as a combination of parallel and serial leaf springs, facilitating a friction free and horizontal motion. The stiffness in radial and tangential directions are much higher than in normal orientation.
If the test specimen has a two-dimensional, flat contact surface, the misalignment of the pin in a Pin-on-Disc setup is a phenomenon that appears even in very stiff and robust Pin-on-Disc testers. The measured friction forces are not sensitive to the tilting movement, but the wear processes that take place in the contact zone are.
For investigations of the friction surface, an adaptive adjustment is necessary if no long measurement intervals with constant system preferences are tested. This paper shows the adaptive adjustment and the influence on measurements of friction and wear.