By David Barton
A suite of topical papers on automobile brakes from a convention geared up via the Yorkshire Centre of the car department of the IMechE. The convention concerned with the newest improvement and seeked to handle the foremost difficulties dealing with the hard department of automobile engineering.
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Extra info for Brakes 2000: Automotive Braking Technology for the 21st Century
3 Pre-treatment of the brake components The disc and the pads were first subjected to a run-in procedure of 210 brakings at brake line pressures between 3 and 24 bar. This procedure has previously been shown to generate well run-in disc and pad surfaces with a stable friction over time. After the run-in procedure, a 108° sector of the disc was grit-blasted with angular SiC-particles producing a rough surface, see figure 2. This surface treatment has been shown to prevent brake squeal when applied to the whole disc (1).
With this the moment of dislocation formally equals to In this term ycg and A are functions of the dimensions ri, r0 and yd, which one can find in standard works like (6). For linear spared gliding sheets as shown in figures 3 and 4 after some computation the resulting moment of dislocation follows as The maximum moment of dislocation results for the shape of the contact area being the half of a circular ring (which means yd = 0 in figure 4) as To show the grade of efficiency of a selected geometry independent of the applied brake pressure p, the moment of dislocation from equation 6 will be referred to the maximum moment from equation 7.
To reduce the amount of collected data, the sampling periods were limited to 2 seconds followed by 5 seconds unrecorded periods during each braking. In addition, manual tests were performed at lower, constant speeds. During these tests the brake-line pressure was manually adjusted to generate squeal. 3 RESULTS The results from the brake squeal tests are exemplified in figure 5, showing the brake-line pressure, coefficient of friction, vibration level and the overlap between brake pad and gritblasted sector variations over time.