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任何一个伺服系统,它的稳定性、快速响应性以及静态精度等都必需给予充分的考虑。这种精度是把时间t取做无穷大时的输入和输出之间的偏差,通常把它称做稳定偏差。凡是一个伺服系统,在启动的一瞬间都存在着过渡过程,当过渡过程结束后,系统的输出便趋向于稳定值,这个稳定值也称做跟踪偏差。对于精度要求高的系统希望跟踪偏差等于零。特别是在录象系统中,为了使磁头和磁带保持一定的跟踪关系,跟踪偏差必需是零。这样,在重放时无论磁带在哪个位置启动就都和位置无关了。否则,磁带和磁头不能保持准确的跟踪关系就得不到清晰的图象。为了便于对稳定偏差进行计算,本文详细的推导了稳定偏差的求解公式。文中还列举了实例对三种稳定偏差进行了求解,通过求解的结果,指出了伺服系统的设计方向。文中不但讨论了直接闭环系统的稳定偏差,同时对非直接闭环的反馈系统以及直接闭环的反馈系统在干扰情况下的固定偏差也进行了讨论。本文图8幅,参考文献4种
Any one servo system, its stability, fast response and static accuracy must be given full consideration. This accuracy is the deviation between the input and the output when the time t is taken as infinity, which is usually called the stable deviation. Whenever a servo system, there is a transition process in the moment of start, when the transition process is over, the output of the system tends to a stable value, this stability is also called tracking deviation. For systems requiring high accuracy, the tracking deviation is expected to be equal to zero. Especially in the video recording system, in order to make the head and the tape keep a certain tracking relationship, the tracking deviation must be zero. In this way, no matter where the tape is started during playback, it has nothing to do with the position. Otherwise, the tape and head will not be able to maintain an accurate tracking relationship will not get a clear image. In order to facilitate the calculation of the stable deviation, this paper derives the formula of the stable deviation in detail. In this paper, examples are also given to solve the three kinds of stable deviations, and the design direction of the servo system is pointed out through the solution. The paper not only discusses the stability deviation of the direct closed-loop system, but also discusses the fixed deviation of the indirect closed-loop feedback system and the direct closed-loop feedback system in case of interference. This article 8 pictures, 4 references