Influence of Car tire Aspect Ratio on Driving Through Road Unevenness

The dimensions of the tires affect the resistance of the vehicle's movement, its traction properties and the ability to reduce the vibrations generated by road unevenness. Modern tires must provide excellent grip on dry and wet surfaces, on a straight and winding road. They should also be characterized by low rolling resistance, aquaplaning resistance, low noise emission and high durability. The general trend in car construction is the use of tires of ever larger diameters and a relatively large width. It is claimed that low aspect ratio tires are characterized by better steering capacity and greater yaw resistance, which is particularly noticeable when cornering. Tires with a higher aspect ratio improve ride comfort, reduce rolling resistance and allow higher obstacles to be overcome. The article presents a comparison of vibrations generated by road unevenness when traversed by a vehicle equipped with tires of different aspect ratio. The tests were divided into two stages: tests of radial stiffness of the tires and road tests on drive through of road unevenness by the B class car equipped with tires of different aspect ratios. A comparison of the spectral density of the power of the vertical acceleration of the car body is provided. The Lomb-Scargle periodogram was used for the analysis.