Abstract
In testing, conflict often arises between adequate simulation of interacting variables and the need to achieve precise repeatability. The development of a control system is described in which firstly an X-Y plotter and later a punched chart is used to programme an inertia dynamometer. Simultaneously a continuous plot of material behaviour is obtained. Friction and wear data from both disc brakes and large commercial vehicle drum brakes are shown, and demonstrate the comprehensive assessment of material behaviour. The standard deviations between tests for wear and for coefficient of friction are 0.005mm (0.0002 in) and 0.003 respectively.
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