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.
Get full access to this article
View all access options for this article.
References
1.
CarpenterN.‘Some measurements of brake usage in a high speed saloon car’. Proc. Auto. Divn. Instn. Mech. Engrs., 1955–56, 241.
2.
LivseyA. E.PrestidgeA. F.WoorD. F.‘Research into brake usage in passengers cars’. Proc. Auto. Divn. Instn. Mech. Engrs., 1960–61, 211.
3.
LivseyA. E.PrestidgeA. F.WoorD. F.‘A test schedule for passenger car brakes’. Proc. Auto. Divn. Instn. Mech. Engrs., 1960–61, 221.
4.
FroodA. D. M.MackenzieD. K.NewcombT. P.‘Brake usage in a heavy vehicle’. Proc. Auto. Divn. Instn. Mech. Engrs., 1960–61, 351.
5.
MackenzieD. K.NewcombT. P.WattonB.‘Car brake usage and test schedules’. Proc. Auto. Divn. Instn. Mech. Engrs., 1962–63, 45.
6.
MackenzieD. K.NewcombT. P.WattonB.A European proving trial’. Automobile Engineer, Jan 1966, 56, 18.
7.
SpurrR. T.NewcombT. P.‘Testing of commercial vehicle brakes’. Twelfth International Congress of FISITA. Barcelona 1968, Paper 209.
8.
MooreM. W.WattonB.‘Disc brake pad wear evaluation’. Proc. Auto. Divn. Instn. Mech. Engrs., 1970–71, 127.
