控制系統(tǒng)的介紹英文翻譯-文庫吧資料
2024-11-13 13:35本頁面
【正文】 r can be advantageously carried out if the system under consideration is represented by a set of firstorder differential equations and the analysis is carried out via matrix theory. 8 This is in essence what is referred to as the state space or state variable approach . This method , although applicable to single inputoutput systems , finds important applications in the multivariable system . Another very attractive benefit is that it enables the control system engineer to study variables inside a system. Regardless of the approach used in the design and analysis of a control system , we must at least following steps: (1) Postulate a control system and the system specifications to be satisfied. (2) Generate a functional block diagram and obtain a mathematical representation of the system . (3) Analyze the system using any of the analytical or graphical methods applicable to the problem. (4) Check the performance (speed , accuracy, stability, or other eriterion) to see if the problem. (5) Finally, optimize the system parameters so that (1) is satisfied. 控制系統(tǒng)的介紹 1. 歷史回顧 早在人類歷史文明出現(xiàn)之初，人們就產(chǎn)生了控制自然力的愿望。 4 Introduction to Control System 1. 1 HISTORICAL PERSPECTIVE The desire to control the forces of nature has been with man since early civilizations. Although many examples of control systems existed in early times, it was not until the mideighteenth century that several steam engine, and perhaps the most noteworthy invention was the speed control flyball governor invented by James Watt. The period biginnign about twentyfive years before World War Two saw rapid advances in electronics and especially in circuit theory, aided by the now classical work of Nyquist in the area of stability theory, The requirements of sophisticated weapon systems, submarines, aircraft and the like gave new impetus to the work in control systems before and after the war The advent of the analog puter coupled with advances in electronics saw the beginning of the establishment of control systems as a science. By The midfifties, the progress in digital puters had given the engineers a new tool that greatly enhanced their capability to study large and plex systems. The availability of puters also opened the era of datalogging, puter control, and the state space of modern method of analysis. The sputnik began the space race and large governmental expenditures in the space as well as military effort. During this time. circuits became miniaturized and l
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