Title: Vehicle Vertical Vibration and Tire Performance
text: In the first part of this paper methods recently developed for the study of the oscillations of running vehicles are described as well as two types of analysis. Some information about the apparatus used for recording and analysis are given. In the second part the results of the analysis of the vertical vibration of a car fitted with three types of tires running on various types of road at various speeds are presented and discussed. Finally, in the third part, the possible influences of tires on the vertical vibration of the vehicle are surveyed. The viscoelastic deformations of the tires cause middle frequency oscillations which are transmitted from the tires to the unsprung masses and to the car body.