An Investigation of the Control of Tire Thump by Tire Shape 590006

WITH the advent of low-pressure tires and the success of car noise reduction efforts by automotive engineers, tire thump has become a more noticeable problem. This paper discusses some recent research in this area.*
A tire's susceptibility to thump can be predicted from the difference frequency between diametrical and circular modes of vibration. The author describes the testing and procedure uses to find the source of thump.
The way to minimize thump is to shape and construct the tire so that it does not permit coincidence of two natural frequencies with two revolution rate harmonics in the 20–35 mph speed range.


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