tailieunhanh - RECENT ADVANCES IN ROBUST CONTROL – NOVEL APPROACHES AND DESIGN METHODSE Part 13

Tham khảo tài liệu 'recent advances in robust control – novel approaches and design methodse part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simplified Deployment of Robust Real-Time Systems Using Multiple Model and Process Characteristic Architecture-Based Process Solutions 349 SELECTOR - based on adequate criteria evaluations provides information about the most appropriate model for the system s current state y and y1 y2 . yN - output of the process and outputs of the N models u - output generate by Command calculus block u and u1 u2 uN - output of the Command calculus block and outputs of the N control algorithms respectively r -set point system or reference trajectory p - disturbances of physical process. As noted above depending on the process specifics and the approach used to solve the control algorithms switching and or the best model choice problems the scheme can be adapted on the situation by adding eliminating some specific blocks. This section focuses on the switching problem. Control algorithms switching The logic operation of multiple model system structure implies that after finding the best algorithm for the current operating point of the the next step consists in switching the control algorithm. Two essential conditions must be verified with respect to this operation To be designed so that no bumps in the applications of the control law are encountered To be very fast. Shocks determined by the switching operation cause non-efficient and or dangerous behaviors. Moreover a switch determines a slow moving area of action of the control algorithm which involves at least performance degradation. These are the main problems to be solved in designing block switching algorithms. From structurally point of view this block may contain all implementation algorithms or at least the algorithm coefficients. Classic solutions Present solutions Landau et al. 1997 Dumitrache 2005 solve more or less this problem and they are based on maintaining in active state all the control algorithms also called warm state . This supposes that every algorithm receives information about the process output y