Automotive

Advances in Tyre Mechanics by R.A. Ridha, M. Theves

By R.A. Ridha, M. Theves

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Particular attention is paid to advances in polyester reinforcement fibres, especially Allied-Signal's DSP fibres, testing of cord properties for prediction of in-tyre performance, reduction of sidewall indentations, improvement of handling, improvement of uniformity through reduced modulus variation, and modelling of severe-endurance strength for high-speed impacts. 3 refs. Tyre cord stress-strain mastercurves are used, and the process of post-cure inflation for a bias tyre size 560-13 was simulated.

I Tyre spring rate variation over frequency of input \.. 80 100 120 140 Frequency (Hz) Steel Belted Radial - - _. Steel Belted 20" BPCA ,-... D Figure 39 0 0 0 -... 5 Cl,) Spring rate responses of radial and a 20° BPCA (body ply crown angle) tyre ~ ~ eo c .... 0 Cl. 7 radians/s (188 km/h) due to a point load Holograpby offers a means for visualising tyre vibrations (453). A typical hologram is shown in Figure 40. Each 'bull's eye' depicts an area vibrating outward, with its centre having the largest amplitude.

Techllol. Ellgr. 46-7 TYRE PRESSURE AND DAMPER MONITORING Craighead I A Strathcl yde, U ni versi ty Developments in tyre pressure and damper monitoring systems are reviewed and their shortcomings analysed. A system has been designed by researchers at Strathclyde University which is based on measuring the dynamic behaviour of the wheel/axle sub-assembly as the vehicle is driven. A description is included of the measurement system which consists of an accelerometer mounted 32 Coupons from unused aircraft tyres were preloaded in tension and conditioned by static thermal ageing, room temperature dynamic ageing, and dynamic thermal ageing.

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