{"id":5837,"date":"2020-03-03T09:00:43","date_gmt":"2020-03-03T08:00:43","guid":{"rendered":"https:\/\/www.presticebdt.com\/?p=5837"},"modified":"2023-09-24T13:18:30","modified_gmt":"2023-09-24T11:18:30","slug":"4-important-dynamic-properties-of-tyres","status":"publish","type":"post","link":"https:\/\/www.presticebdt.com\/fr\/4-important-dynamic-properties-of-tyres\/","title":{"rendered":"4 propri\u00e9t\u00e9s dynamiques importantes des pneus | Motorsport"},"content":{"rendered":"

Dynamic properties of tyres: tyre uniformity
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What are the dynamic properties of tyres?<\/h2>\n

Definition of tyre uniformity.
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Tyre Uniformity<\/strong> refers to the dynamic mechanical properties of pneumatic tires as strictly defined by a set of measurement standards<\/strong> and test conditions accepted by global tire and car makers<\/strong>. These standards include the parameters of radial force variation<\/strong>, lateral force variation, conicity<\/strong>, plysteer<\/strong>, radial run-out, lateral run-out, and sidewall bulge. Tire makers worldwide employ tire uniformity measurement as a way to identify poorly performing tires so they are not sold to the marketplace. Both tire and vehicle manufacturers seek to improve tire uniformity in order to improve vehicle ride comfort. You are Matlab user and you want to discover how to manage large data for tyre modelling check this MathWorks link<\/a>.<\/p>\n

\"dynamic<\/a><\/p>\n

Stress and Forces on tyres.
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The circumference of the tire can be modeled as a series of very small spring elements<\/strong> whose spring constants vary according to manufacturing conditions. These spring elements are compressed as they enter the road contact area, and recover as they exit the footprint. Variation in the spring constants in both radial and lateral directions cause variations in the compressive and restorative forces as the tire rotates<\/strong>. Given a perfect tire, running on a perfectly smooth roadway, the force exerted between the car and the tire will be constant. However, a normally manufactured tire running on a perfectly smooth roadway will exert a varying force into the vehicle that will repeat every rotation of the tire. This variation is the source of various ride disturbances. Both tire and car makers seek to reduce such disturbances in order to improve the dynamic performance of the vehicle.<\/p>\n

Tire forces are divided into three axes<\/strong>: radial, lateral, and tangential<\/strong> (or fore-aft). The radial axis runs from the tire center toward the tread, and is the vertical axis running from the roadway through the tire center toward the vehicle. This axis supports the vehicle’s weight. The lateral axis runs sideways across the tread. This axis is parallel to the tire mounting axle on the vehicle. The tangential axis is the one in the direction of the tire travel.<\/p>\n

Which are the main parameters to assess the dynamic properties?<\/h3>\n