By David Barton
A set of topical papers on automobile brakes from a convention equipped by means of the Yorkshire Centre of the car department of the IMechE. The convention occupied with the most recent improvement and seeked to deal with the most important difficulties dealing with the tough department of automobile engineering.
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Extra resources for Brakes 2000: Automotive Braking Technology for the 21st Century
Generally, this increase was faster than the decrease when the sector entered between the pads. 5 rps, corresponding to a sliding distance of half a pad length. At the lower speed, the friction coefficient dropped significantly each time more than half of the pad had entered the grit-blasted sector. Note that at this position the vibration level has already decreased to zero, as in the case of the higher speed. The coefficient of friction reached its lowest level when the whole pad was sliding against the grit-blasted surface.
The most obvious effects originating from the passage of the grit-blasted sector between the pads were the squeal inhibition and the decrease in friction coefficient during the end of and just after the passage. e. e. the trailing edge of the pad had passed the leading edge of the sector). e. when the whole pad had reached the untreated disc surface). At the higher speed, the vibration of the pad increased very rapidly when resuming the squealing contact conditions. Generally, this increase was faster than the decrease when the sector entered between the pads.
3. The leading edge of the pad passes the trailing edge of the sector. 4. The trailing edge of the pad passes the trailing edge of the sector. -value of the pad vibration amplitude. 5. This signal will be referred to as the "vibration level". Note that, to represent a quantitative value of the brake squeal, the measured vibration level is the envelope of the vibrations between 1 and 20 kHz, only. 5 Test procedure The test procedure was designed to give detailed information about how the brake-line pressure, friction coefficient and pad vibration varied as the grit-blasted sector repeatedly passed between the pads.