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https://www.nationalacademies.org/trb/events

EFFECTS OF THE GEOMETRY AND ELASTICITY OF THE MEASURING WHEEL SUSPENSION IN THE STUTTGART FRICTION METER ON COEFFICIENT OF SLIDING

UNTERSUCHUNGEN UEBER DIE GEOMETRISCHEN UND ELASTISCHEN EINFLUESSE DER MESSRADAUFHAENGUNG DES STUTTGARTER REIBUNGSMESSERS AUF DEN GLEITBEIWERT

THE MEASURING WHEEL SUSPENSION OF THE STUTTGART FRICTION METER WAS CONSTRUCTED AS A PARALLELOGRAM, SO THAT BRAKING FORCE AND WHEEL LOAD DID NOT HAVE A MUTUAL EFFECT ON ONE ANOTHER IF THE PARALLELOGRAM WAS RECTANGULAR. SINCE THE STUTTGART FRICTION METER IS BEING USED INCREASINGLY FOR MEASUREMENTS OF THE COEFFICIENT OF SLIDING ON VERY WORN CARRIAGEWAYS, WHICH ARE NO LONGER SUFFICIENTLY EVEN AND CONTAIN IRREGULARITIES WHICH CAUSE VIBRATION, THE DYNAMIC CHARACTERISTICS OF THE MEASURING WHEEL SUSPENSION HAVE TO BE EXAMINED WHEN IT IS SUBJECTED TO THIS SORT OF STIMULATION. THE INTERACTION OF THE GEOMETRICAL AND ELASTIC EFFECTS OF THE MEASURING WHEEL SUSPENSION WITH THE ELASTIC CHARACTERISTICS OF THE TYRES MAY LEAD TO ERRORS IN THE MEASUREMENT OF THE COEFFICIENT OF SLIDING AS A RESULT OF THE MEASURING WHEEL VIBRATIONS WHICH MAY BE EXPECTED AND THE ASSOCIATED WHEEL LOAD FLUCTUATIONS. THE AIM OF THE STUDIES IS TO PROVIDE QUANTITATIVE DATA ON THE TYPE AND EXTENT OF THE POSSIBLE MEASUREMENT ERRORS, SO THAT APPROPRIATE COUNTERMEASURES CAN BE TAKEN.