SYSTEMATIC DESIGN AND STABILITY ANALYSIS OF A FUZZY-LOGIC CONTROLLER

Although the fuzzy logic controller has been adopted in many engineeri ng applications, its performance is not guaranteed since there is no d efinite stability analysis. It may be the main factor that we hesitate to adopt the FLC in critical applications. In this paper, a guideline of systematic analysis and design of an FLC is presented for guarante eing the stability and/or the performance. Based on the well-developed variable structure system theory, we account for the relationship bet ween the tracking accuracy of a control system and the I/O fuzzy set m embership shapes of the FLC. It is also possible to explain the perfor mance or the stability of commonly used FLCs through the proposed guid eline for the design and analysis.