1997 Volume 61 Issue 1 Pages 18-24
The uniformity in the microstructures of materials is one of the most important factors in the properties and behavior of materials. However, the uniformity has not been characterized well. Therefore, the uniformity evaluation is revealed at present from inspection such as sensory test performed by expert. The evaluation of the uniformity by subjective sense inspection of an expert generally includes fuzziness or ambiguity. This paper attempts to construct the objective and quantitative evaluation systems based on the technique of fuzzy reasoning for the uniformity on grain structure. The systems are modelled by the fuzzy inference rules with two input variables (Usp, Usize) and a single output variable(sensory evaluation), and are trained by the results of the expert sensory test. The results obtained by the fuzzy reasoning are in good agreement with the results of sensory test by experts. Furthermore, the avaiability of the present fuzzy reasoning system is confirmed by the comparison of the performance for training data and test data with the statistical method using linear regression analysis.
