Method calculated considering geometric average of ordinates - Metrology & Quality Control

Q.  Which method is calculated considering geometric average of ordinates?
- Published on 07 Aug 15

a. Centre line average method
b. Peak to valley height method
c. Root mean square method
d. All of the above

ANSWER: Root mean square method

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    Discussion

  • Sravanthi   -Posted on 26 Oct 15
    - Root mean square method is used to calculate average ordinate of surface roughness.

    - It is calculated as geometrical average and not as arithmetic average for CLA values.

    - yrms is 11% greater than yCLA for same texture and same length of a surface.

    The formula to calculate average ordinate of surface roughness is:

    y = √(y12 + y22 + y32) / n

    y = √ (Σy12 ) / n

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