UC知道英文高手进：帮忙翻译成英文
来源：百度知道 编辑：UC知道 时间：2024/06/17 11:03:03
在炼油、化工、热工等生产工程中，不少被控对象具有不同程度的纯滞后。这样的过程必然会产生较大的超调量和较长的调节时间，使过渡过程品质变差，系统的稳定性降低。早在50年代，国外就对工业生产过程中纯滞后现象进行了深人的研究。纯滞后的大小直接影响着系统动态特性的好坏。我们通常用纯滞后时间 与过程的惯性时间常数T的比值（ ／T ）来度量纯滞后对系统的影响程度。对于大纯滞后系统，很难下一个绝对的定义。一般认为 ／T 的过程是具有大纯滞后的过程，此时纯滞后时间 在对象整个反应时间里起主导作用。因此，具有纯滞后的过程控制被认为是较难的控制问题，成为控制理论和控制工程领域研究的热点。自从1959年O.J.Smith提出著的Smith预估器控制方法以来，Smith预估补偿方法在时滞对象的控制中得到了广泛的应用。在对象数学模型精确的前提下，Smith预估器被认为是作为控制时滞系统的一种有效方法
In the refining, chemical, thermal and other production projects, a number of charged objects have varying degrees of time delay. Such a process would have a larger overshoot and longer settling time, so that the quality of the transition process variation, reducing the stability of the system. As early as the 50s, foreign industrial production on the course of the phenomenon of the time delay in-depth research. Time delay directly affects the size of the dynamic characteristics of the mixed system. We usually use pure lag time and process time constant T of the inertia ratio (/ T) to measure the time delay effect of the system. For large time delay system, it is difficult to under the definition of an absolute. Is generally believed that / T is a major process of the process dead time, when the time delay response time to target the entire time playing a leading role. Therefore, the process dead time control is considered more difficult to control problems, control theory as a fiel