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Qualitative algebraic equations are the basis of qualitative simulation,which are used to express the dynamic behavior of steady-state continuous processes.When the values and operation of qualitative variables are redefined,qualitative algebraic equations can be transformed into signed direct graphs,which are frequently used to predict the trend of dynamic changes.However,it is difficult to use traditional qualitative algebra methods based on artificial trial and error to solve a complex problem for dynamic trends.An important aspect of modern qualitative algebra is to model and characterize complex systems with the corresponding computer-aided automatic reasoning.In this study,a qualitative affection equation based on multiple conditions is proposed,which enables the signed di-rect graphs to describe complex systems better and improves the fault diagnosis resolution.The application to an industrial case shows that the method performs well. 相似文献
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来自中上游的工业污染多年来一直是黄河水污染的祸首。中上游城市的生活污水也加重了黄河的污染,全流域超过30%的污染来自于城市污水。此外,水资源开采无序也是导致黄河水污染的重要原因。黄河支流湟水、汾河、涑水、渭河、沁河等流入黄河的水质几乎常年为劣Ⅴ类…… 相似文献