010-p2u5a-intoduction to modern control theory010-p2u5a-introduction to modern control theory010-p2u5a-introduction to modern control theory010-p2u5a-introduction to modern control theory.ppt

* * P2U5A Introduction to Modern Control Theory 第二部分第五单元课文A 现代控制理论简介 Introduction to Modern Control Theory Introduction Classical control theory is based on input-output relationships, principally the transfer function. When differential equations are encountered, they are linearized and subjected to whatever constraints are necessary to establish useful input-output relationships. Modem control theory, on the other hand, is based on direct use of the differential equations themselves. Although its techniques are powerful and relatively simple, classical control theory does have limitations and shortcomings that multiply as plants and control systems become more complex--thus the advent of modem control theory. P2U5A Introduction to Modern Control Theory 第二部分第五单元课文A 现代控制理论简介 Several factors provided the stimulus for the development of modem control theory: (1) The necessity of dealing with more realistic models of systems, (2) The shift in emphasis towards optimal control and optimal system design, (3) The continuing developments in digital computer technology, (4) The shortcomings of previous approaches, (5) A recognition of the applicability of well-known methods in other fields of knowledge. The transition from simple approximate models, which are easy to work with, to more realistic models produces two effects. First, a larger number of variables must be included in the model. Second, a more realistic model is more likely to contain nonlinearities and time-varying parameters. Previously ignored aspects of the system, such as interactions with and feedback through the environment, are more likely to be included. P2U5A Introduction to Modern Control Theory 第二部分第五单元课文A 现代控制理论简介 With an advancing technological society, there is a trend towards more ambitious goals. This also means dealing with complex systems with a larger number of interacting components. The need for greater accuracy and efficiency has changed the emphasis