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No. 99MBB091A
14. REFERENCE INFORMATION
14.6.2 Roughness motif parameters
R1
Ri
Ri+1
R
2Nmr
AR
Nmr
ARj
Evaluation length ᐉn
AR1
Assessed profile
14.6.2.1 R
R is the mean of the Ri (height of roughness motif) values of each motif.
2Nmr
i=1
R =
1
2Nmr
Ri
∑
14.6.2.2 AR
AR is the mean of roughness motif widths.
Nmr
j=1
AR =
1
Nmr
ARj
∑
14.6.2.3 Rx
Rx is the maximum value of Ri (height of roughness motif) values of each motif.
14.6.3 How to obtain waviness motifs
1. Determine the peak and valley of a waviness motif.
Assuming the peak data in a roughness motif as a data sample (point), do the following
from the first point.
Search for a point with a height that is heigher than the next point, and set this point as a
peak.
Search for a point with a height that is lower than the next point, and set this point as a
valley.
2. Compose a waviness motif.
Perform operations similar to those described in 4) and 5) of 14.6.1 How to obtain rough-
ness motifs.
Note that, LR should be replaced by LW (upper limit of waviness motif length).
3. Calculate the waviness motif parameters.
While selecting motifs with a width that is greater than LW, obtain the parameters of the
waviness motif.
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