控制系統(tǒng)的介紹英文翻譯-在線瀏覽
2025-01-08 13:35本頁面
【正文】 er and more interesting. As an example of a control system consider the simplified version of the attitude control of a spacecraft illustrated in . We wish the satellite to have some specific attitude relative to an inertial coordinate 6 system. The actual attitude is measured by an attitude sensor on board the satellite. If the desired and actual attitudes are not the same, then the parator sends a signal to the valves which open and cause gas jet firings. These jet firings give the necessary corrective signal to the satellite dynamics thereby it under control .A control system represented this way is said to be represented by block diagrams. Such a representation is helpful in the partitioning of a large system into subsystems and thereby allowing the study of one subsystem at a time. If we have many inputs and outputs that are monitored and controlled, the block diagram appears as illustrated in . Systems where several variables are monitored and controlled are called multivariable systems. Examples of multivariable systems are found in chemical processing, guidance and control of vehicles, the national economy, urban problems. The number of control systems that surround us is indeed very large. The essential feature of all these systems is in general the same . They all have input ,control ,output, and disturbance variables. They all describe a controller and a plant . They all have some type of a parator. Finally, in all cases we want to drive the control system to follow a set preconceived mands. DESIGN, MODELING ,AND ANALYSIS Prior to the building of a piece of hardware, a system must be designed, modeled, and analyzed. Actually the analysis is an important and essential feature of the design process. In general, when we design a control system we do so conceptually. Then we generate a mathematical model which is analyzed. The results of this analysis are pared to the performance specifications that are design a control system we do so conceptually. Then we generate a mathematical model which is analysis are pared to the performance specifications that are desired of the proposed system. The accuracy of the results depends upon the quality of the original model of the proposed design. We shall show , in Chapter7, how it is analyzed and then modified so that its performance satisfies the system specifications. The objective then may be considered to be the prediction , prior to construction, of the dynamic behavior that a physical system exhibits, . its natural motion when dist
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