基于粒计算面向工艺实例检索的材料相似度算法_周丹晨.pdf

50 13 Vol.50 No.13 2 0 1 4 7 JOURNAL OF MECHANICAL ENGINEERING Jul. 2 0 1 4 DOI 10.3901/JME.2014.13.170 * ( 621900) TH162 TP18 Material Similarity Algorithm for Process Cases Retrieval Based on Granular Computing ZHOU Danchen (Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900) Abstract Aiming at the problem of larger error in the similarity calculation of material type, material brand and heat treatment method in process cases retrieval, and according to the analysis that the essence of three kinds of similarity calculation is similar degree comparison of different materials on the physical and mechanical properties, the idea of unifying three kinds of similarity as material similarity and its algorithm based on granular computing is put forward. On the basis of five kinds of performance index values of material samples in the process case library, including hardness, tensile strength, elongation, impact toughness and thermal conductivity, the corresponding machinability grade value of every performance index is determined through comparing with the general material machinability classification table. By the integrated application of fuzzy tolerance quotient space theory