可拓知识表示在水轮机选型设计中的应用

Application of extensible knowledge expression in the design of water turbine type selection

水轮机结构复杂,传统知识表示不能满足选型设计的需要,为此提出了一种基于可拓模型的知识表示(简称可拓知识表示)方法。首先给出了该表示方法的定义、语法规范和存储结构;论述了在该方法基础上的推理算法及问题求解过程,包括可拓图构建、物元拓展推理及条件可拓集合的生成;最后将该方法应用于尼尔基水电站的水轮机选型设计中。由于可拓知识表示扩充了传统方法的表示内容,采用该方法可以得到比采用传统知识库系统更合理的推理结果。

The traditional knowledge expression couldn＇ t satisfy the requirements of type selection of water turbine due to its structural complexity. For this reason a kind of knowledge expres- sion method based on extensible model （simplified as extensible knowledge expression） was put forward in this paper. Firstly the definitions of this expression method, grammar specifications and storage structure were given out. The reasoning algorithm based on this method and the problems solving processes that include the construction of extensible graph, the reasoning and condition of matter-element extension and the generation of extensible sets, were discussed. Finally this method was applied to the type selection design of water turbine of Nilgiri hydropower station. Owing to the extensible knowledge expression extended the contents of expression of the traditional method, by adopting this method a more reasonable reasoning result can be obtained than those obtained from the traditional knowledge base system.