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Comparison of classification ability indices of parameters characterizing the stereometric features of technical surfaces

Rozanski R.

Journal of Machine Engineering

2018

Vol. 18, No. 3

98--106

The study examined the relationship between the values of two indices evaluating the classification capacity of parameters characterizing the stereometric features of technical surfaces. The values of 83 3D parameters characterizing the stereometric features for 22 surfaces created in various machining processes were taken into account. The examined surfaces differ significantly in the stereometric characteristics of the surface with the similar value of the St parameter. The variance and the geometric mean of ordered parameter values differences were used as the indices of parameters classification ability. In particular, the existence, type and strength of relationship between the adopted indices were evaluated, and the model of the relationship between the indices was determined using the least-squares method. A comparison of the results obtained with those obtained from the analogous evaluation for 8 types of theoretical distributions of parameter values was also carried out.

Evaluation of Classification Ability of the Parameters Characterizing Stereometric Properties of Technical Surfaces

Kacalak W., Różanski R., Lipiński D.

Journal of Machine Engineering

2016

Vol. 16, No. 2

86--94

The analysis of classification ability of the parameters used for the description of surfaces formed during the processes of technological processing constitutes important issue in the surface layer metrology. To investigate the classification ability, variance and geometric mean of the ordered differences of the parameter value. The study compares behaviour of both indices for different distributions of ordered differences of the parameter value. Moreover, the relationship between bot indices and influence of the number of minor differences of the parameter value on the value of variance and geometric mean.