A Method of Measuring the Cushioning Quality of Tires
TIRES of high shock-absorbing capacity greatly reduce the blows delivered to roadways by heavy vehicles and the reactions on the vehicles; they also absorb most effectively the shocks in a vertical direction that are the cause of the greatest discomfort to passengers. With a view to making a laboratory study of these shock-absorbing properties of tires, an instrument called a bounce-recorder has been devised and is described. This instrument records the paths followed by tires in passing over obstacles placed in their way. From these records, the vertical acceleration of a tire at any point of its flight can be determined, the purpose of doing so being twofold, namely, to develop an accurate and fairly rapid means of ascertaining the relative shock-absorbing capacities of tires by the acceleration method and to find out whether load-deflection tests made on the Olsen testing-machine could be used for the same purpose.