The problem of designing a non—reconfigurable control system that willpreserve the stabi J．ity of close loop system when some actuator and sensor failures Occur， i．e．，the integrity problem of control system， is considered in the thesis· It is shown that such problem can be dealt with using the concept of simuitaneous stabiiization．The main contribution of the thesis is as follows： 1．The effect of common fai lure modes of actuator and sensor (for example， stuck failure， open failure and bias failure) on the stabi上ity of close loop system is analyzed· It is shown that if only the stability of close loop system is considered then the failure of the Jth actuator or ith sensor can be descrlbed by setting the Jth column or ith row of the transfer function matrIX P of the plant to zero． 2．To determine what actuator and sensor fai lures a control system may has integrity against， a definition of functional redundancy of actuators and sensors is given and two methods ot analyzing the functional redundancy are proposed· 3．The design Of state feedback Iaw that possess integrity against some permissibie actuator failures is studled and a simple design method is obtained．The method can be used for both stable and unstab上e plants． I t is shown that there exlst state feedback laws possessing integrity with respect to any fallures of s ingle actuator general ly prov ided that the number of unstable modes of a plant is smaller than that of inputs of the plant· 4． Some sufficlent conditions for a compensator to possess integrity against actuator failures，sensor failures and both actuator and sensor fai lures are developed based on both the factorization description of p上ant and the state feedback laws possessing integrity against actuator failures proposed preyiously． A procedure for designing such compensator is then proposed． 5． A procedure for the design of controller satislying both integrity and other performances requirement is developed by using parameter optimization methods．Some examples are used to illustrate the effectiveness of the procedure. 6．The robustness of controller possessing integrlty is studied and some approach to improve the robustness of the fault— tolerant control system is proposed． 7．The problem of reliable regufation and tracking is discussed and a scheme for the realization of reliable regufation and tracking i s obtained． Some of the design method proposed in the thesls have been illustrated by the models of some actual plants·The results are satisfactory．
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