File:Friction coefficients of brake linings (1912) (14592544109).jpg

Identifier: frictioncoeffici00buye (find matches)
Title: Friction coefficients of brake linings
Year: 1912 (1910s)
Authors: Buyers, Donald Erskine
Subjects: Friction materials Brakes Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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emperature with increasing pressures. To save time in calculating the tangential force T for everyload on the scales,two values of W in equation (3) were assumed andthe values of T for those two points calculated. fince this equa-tion is of the first degree it must represent a straight line hence,a straight line connecting the two points referred to above wouldbe the graphical representation of the equation. This curve isshown on page 19. The ordinates represent values of ff, and theabscissae, values of T. For any value of W the corresponding valueof T will be found by running from the ordinate axis horizontallyto the curve anu. then dropping vertically downward to the axis ofabscissa where the value of T will be read directly in pounds. Values of W were recorded in column (1) of the data sheetsand the corresponding values of T as read from this curve,in column(2). The compression of the spring was recorded in column (3).The corresponding value as read from the calibration curve was K
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-20- in equation (13) and when substituted in that equation gave the valueof (?i + P2) which value was recorded in column (4). Column (2)and column (4) then contained the unknown values of T and (P^ + Pg)in equation (10). Then by substituting these values in equation(10) we obtained the values ofwhich were recorded In column (5).Curves were then plotted with the values in column (4) as abscissaeand the values in column (5) as ordinates. During the various tests average revolutions per minuteof the sheave were taken with a speedometer for each value of theweight on the scales. The weight on the scales was recorded incolumn (1) of Table I on page 46 and the values of the revolutionsper minute, in column (2). The horsepower for each value of theweight on the scales was then calculated by formula (15) and theresults recorded in column (3). Table II was then made up of a series of columns headedwith these values of horsepower. In each column the correspondingvalue from column (5) of the da

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