智能控制智能控制智能控制 (12).pdf

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1、Control Requirements of Expert ControlThe Major Drawbacks of Adaptive ControlTwo major drawbacks of adaptive controlThe requirements for an accurate model of the plantThe inability to set meaningful goals for the adaptive mechanismBasic actions of adaptive system:Recognize the dynamic characteristic

2、s of the object;Take decisions based on the recognition of the object;Change the system actions according to the decision instructions.Why Expert Control?Expertcontrolcircumventstheneedforamathematical model of the plant and providesmeaningful time-domain based goals for theadaptive design.In the ev

3、olution of adaptive control,the expertcontroller is a new and significant milestone forthe design of practical adaptive mechanisms.0102030405Some Control Requirements to Expert ControllersHigh reliability of operationHigh ability of decision-makingVersatility of applicationFlexibilitiesHuman-like ca

4、pabilitySome Control Requirements to Expert ControllersHigh reliability of operation A higher reliability is required for an expert controller which usually has a convenient monitoring capability.If the expert controller were not used,the whole control system would become much more complex.Some Cont

5、rol Requirements to Expert ControllersHigh ability of decision-making Expert control systems can cope with problems such as uncertainty,incompleteness and imprecision.Decision-making is one of the key abilities.Some Control Requirements to Expert ControllersVersatility of application Easy to be deve

6、loped；Paradigm diversity；Hybrid knowledge representation facilities；Flexible dimensionality of the global database；Underlying hardware flexibility,etc.Some Control Requirements to Expert Controllers Flexibility in control strategy；Flexibility in data management；Flexibility in expressing the expertis

7、e；Flexibility in explanation；Flexibility in pattern matching and flexibility in procedural attachment,etc.FlexibilitiesSome Control Requirements to Expert ControllersHuman-like capability The control level of the expert control system has to reach the level of human expertsIn the case of plants with

8、 significant non-linearities of actuator,the objectives of the expert controller are two-fold:To assess the non-linear characteristics.To tune a PI control action.Case 1:High non-linearitiesAnother example,the case of process control:the special requirements for expert controller might deal with:con

9、tinuous operation multiple expert operating at different shifts changing propagation and amplifying through the systeminconsistency in the quality of input materials the process which itself changes gradually over time very complex structures of the plant multiple sensors.Case 2:Process ControlGenerally speaking,there is no unified and fixed requirement for expert control system.The requirements are dependent upon the specific applications.Summary