Based on fault tree analysis (FTA) theory, an object-oriented knowledge representation method in a fault diagnosis expert system for machine tools was studied.
针对所研究的机床故障诊断专家系统，以故障树分析法为基础，采用面向对象的事件知识表示方法。
The Chapter2 introduces cloud theory definition and related knowledge, including two dimensions cloud model, cloud produce machine, and normal cloud model and cloudy account.
第二章介绍了云理论定义及相关知识，包括二维云模型、云发生器、正态云模型及云计算。
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