化工过程SDG建模方法

SDG(Signed Directed Graph)是一种重要的定性建模技术，特别是在安全评价和故障诊断领域。本文系统介绍了两种常用的SDG建模方法：基于数学模型的方法和基于流程图的方法。此外，本文提出了一种基于经验知识的建模方法。由于安全评价强调揭示潜在故障的全面性，而故障诊断则要求诊断速度和故障分辨率高，因此基于经验知识的建模方法分为评价模型建模方法和诊断模型建模方法。采用此方法建立的评价模型不仅能全面表达故障，而且还能揭示故障的传播规律；建立的诊断模型简单精炼、故障分辨率高。

SDG Modeling Approach for Chemical Engineering Process

SDG is an important technology of building qualitative model, especially for hazard evaluation and fault diagnosis. Two modeling approaches based on mathematics model and flow chart are introduced. Besides, a modeling approach based on experience is put forward. Hazard evaluation emphasizes on completeness of revealing latent fault. Fault diagnosis requires high diagnosis speed and fault resolution. Therefore, experience based modeling approach is divided into modeling approach of hazard evaluation model and modeling approach of fault diagnosis model. Hazard evaluation model built by this approach can not only reflect faults completely, but also reveal the rules of fault propagation. Fault diagnosis model built by this approach is simple and has high fault resolution.