例句與造句

1. Abstract : iterative learning control is an effective approach to the control of processes that are repetitive in nature . in this paper , an open - closed - loop pi - type iterative learning control scheme for the precise tracking control of a class of discrete nonlinear time - varying systems over a finite time interval is presented . the scheme updates control input with tracking errors of both current and last iterations simultaneously . sufficient and necessary conditions which guarantee the convergence of the scheme are given and then proved with inductive method . finally , the conditions are verified with simulation results
   文摘:對(duì)于具有重復(fù)運(yùn)動(dòng)性質(zhì)的對(duì)象，迭代學(xué)習(xí)控制是一種有效的控制方法.針對(duì)一類離散非線性時(shí)變系統(tǒng)在有限時(shí)域上的精確軌跡跟蹤問(wèn)題，提出了一種開(kāi)閉環(huán)pi型迭代學(xué)習(xí)控制律.這種迭代律同時(shí)利用系統(tǒng)當(dāng)前的跟蹤誤差和前次迭代控制的跟蹤誤差修正控制作用.給出了所提出的學(xué)習(xí)控制律收斂的充分必要條件，并采用歸納法進(jìn)行了證明.最后用仿真結(jié)果對(duì)收斂條件進(jìn)行了驗(yàn)證
2. It's difficult to find finite time interval in a sentence. 用finite time interval造句挺難的