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五、Smith予估控制不少工业对象具为严重的纯滞后时间(包括高阶对象低阶近似后所形成的等效纯滞后)。一阶近似的传递函数有:
V. Smith estimates that controlling many industrial objects is a severe pure lag time (including the equivalent net lag formed after the low order approximation of higher order objects). First-order approximation of the transfer function are: