الفهرس 
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Abstract
Thesis Summary
The thesis concerned with the effect of the passing of the sedan car tyre over an
obstacle (Cat’s Eye) at various car speeds, inflation pressure tyre and load
conditions on the mechanical vibrations of the sprung and unsprung masses.
The measurement of the mechanical vibrations was made by installing two
accelerometers on the sprung and unsprung masses on the fixation points of the
suspension with the car’s body. The mechanical vibrations were measured and
recorded during the car’s movement by a laptop, data acquisition card and
software designed to record the experimental results in a specific files for each
experiment. The value of the acceleration of the mechanical vibrations is an
indicator for the dynamic forces on the tyre and they are in proportion with each
other.
The experimental and the theoretical work show that passing over the cat’s eyes
has a great effect on the dynamic forces that effect on the tires. The change of
the speed of the vehicle has a distinguish effect on the vertical acceleration that
transmits from the road to the tires and the vehicle body more than the change
in both tyre inflation pressure and load conditions.
Key words: Tyre, Cat’s eyes, sprung and unsprung masses