Design of Structures Foundations for Vibrating Machines by Suresh C. Arya

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3β*. 2 Spacing Parameters Peak count (Pc): Pc is defined as the number of local peaks, which is projected through a selected band located above and below the mean line by the same distance. The boundary lines are located parallel to and equidistant from the profile mean line and are set by the operator for each application. L. Menezes et al. Fig. 18 Method of calculating the correlation length β* Fig. 19 Calculating peak count parameter within a selected band [3] per millimeter. If the assessment length is less than 1 mm, the result should be multiplied by a factor to get the peak count per millimeter.

31a, b that no particular relation exists between surface roughness (in the present test range) and coefficient of friction. In addition, it can be seen that for a given kind of texture, the coefficient of friction did not vary much with surface roughness. 32 illustrates the variation of coefficient of friction with surface textures when Al-4Mg alloy slid on steel plate of various surface textures under dry and lubricated conditions [9]. The error bar in the figure indicates the maximum and minimum friction values obtained for different surface roughness, whereas the connecting line indicates the average friction values obtained for different surface textures.

It is the height difference between the mean line and the lowest point over the evaluation length (see Fig. 16). The valleys in a surface provide information about how a part might retain a lubricant. Because Rv is a single extreme depth value, it is not a very repeatable parameter. It may be a true valley or it may be a scratch. Maximum height of the profile (Rt): Rt is used to measure the peak-to-valley difference calculated over the entire measured array. , Rt ¼ Rp + Rv. Rt is sensitive to high peaks and deep valleys, some of which may be stray particles, flaws, dents, or scratches.

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