Method for measuring the damping coefficient of torsional-vibration dampers

摘要

Measuring method for quickly checking the damping coefficient of torsion-vibration dampers filled with a viscous liquid and being provided with a swing ring. The basic principle relates to the recognition that there is a well measurable, numerically characterizable relation between the damping coefficient of a damper of a given nominal geometry and the number of vibrations of the freely oscillating system into which the damper being tested is fitted. An exemplary, preferred apparatus is described for carrying out the method. The method comprises the steps of determining permissible limit values of the torsional vibration damping coefficient in the vibration system; establishing a characteristic curve of a relation between the coefficient and the number of vibrations of the decay from a determined initial amplitude to a second determined amplitude within the vibration system; tuning the system by one of several expedients; producing the free oscillation with damping within the system; measuring the number of the vibrations in the system upon the characteristic curve; and taking the measured number as a basis between permissible limit values to verify the acceptable quality of the damper, while an inferior quality is being declared at measured values that lie outside the limit values.