四川大學計算機網(wǎng)絡考試2009年-A

1、四川大學期考試試題（閉卷）A卷 （2009 2010 學年第 1學期） 課程號：課序號：0 課程名稱：專業(yè)英語任課教師：楊曉梅成績： 適用專業(yè)年級： 06級自動化本科學生人數(shù)：118人 印題份數(shù)：125學號：姓名： 考試須知 四川大學學生參加由學校組織或由學校承辦的各級各類考試，必須嚴格執(zhí)行四川大學考試工作 管理辦法和四川大學考場規(guī)則。有考試違紀作弊行為的，一律按照四川大學學生考試違紀作 弊處罰條例進行處理。 四川大學各級各類考試的監(jiān)考人員，必須嚴格執(zhí)行四川大學考試工作管理辦法、四川大學考 場規(guī)則和四川大學監(jiān)考人員職責。有違反學校有關規(guī)定的，嚴格按照四川大學教學事故認定 及處理辦法進行處理。

2、注意：所有答案寫在答題紙上 、 1. For parallel connection, the overall tran sfer fun cti on is simply theof in dividual tran sfer functions. A. sumB. differe neeC. productD. ratio 2. The Laplace tran sformatio n ratio of the output to the in put for a system is called A. behavior of the systemB. tran smitt ing fun

3、 cti on C. tran sform fun cti onD. tran sfer fun ctio n 3. A second -order system withlarger than one is referred to assystem A . damp ing ratio B. damped freque ncyC. un derdamp ingD. overdamp ing 4. As damping ratio is .increased , the system overshoot A. in creasesB. decreases C. is con sta ntD.

4、decays 5. The steady state performa nee of a system is best defi ned of A. error parameter B. error con sta nt C. Steady state errorD. Tran sie nt error 6. If the system does not have any, the system can be calledsystem A. output B. feedback c. an ope n loopD. in put 7. The equation mX 二 -kx -cX f (

5、t) is called A. differe ntial equati onB. differe nee equati on C. derivative equati onD. in tegral equati on 8. Ais a con sta nt velocity and is represe nted as r(t)=At (t=0) A. impulse in putB. step in putC. ramp in putD. parabolic in put 9. In the sec on d-order system for the damp ing rati on c1

6、, the system is calledsystem; forc=1, the system is ofsystem A. un derdamp ingB. critical damp ing C. overdamp ing D. No damp ing 10. Theis used to deliver an output sig nal which is larger tha n the in put sig nal A. subtractorB. summerC. amplifierD. divider 11. The poles are, indicating aprocess A

7、. n egativeB. positiveC. stableD. un stable 12. For a overdamp ing sec on d-order system, its characteristic equati on has twoandpoles A. equalB. un equalC. complexD. real 13. theis the path from the in put node to the output node without pass ing through any node twice. A. forward path B. feedback

8、pathC. ope n loop D. double-loop 14. When complex poles are appeared in pair with the same real parts and the minus imaginary they are called thecomplex poles. A. realB. conjugateC. repeated D. disti net 15. the poles closer to the imaginary axis are referred to aspoles A. importa nt B. real C. imag

9、i naryD. dominant Considering a （閉環(huán)系統(tǒng)）,the output transfer function is The （暫態(tài)響應） of the system depends on the （根）of the 特征方程）。The output in（時域）is obtained by the拉式反變 換）of the above equation. For單實根）the response is an衰減指數(shù)）,for complex poles the resp on seis振蕩的）。 The same transfer fun ctio n can also

10、 be formulated into0犬態(tài)空間模型）。 將下列中文專業(yè)術語翻譯成英文（40分） I. 經(jīng)典控制理論2.傳遞函數(shù) 3.狀態(tài)空間方程4.微分方程 5.拉式變換6.零-極點 7.阻尼比 8.暫態(tài)響應 9.穩(wěn)態(tài)誤差10.超調(diào)量 II. 參考輸入 12.干擾輸入 13.反饋控制 14. 一階系統(tǒng) 15.線性動態(tài)模型 16.特征方程 17.階躍響應18.根軌跡 19.功率放大器20.穩(wěn)定性 二、寫出下列公式的英文讀法（20分） 1. 3/5:2. 9.25: 3. 5% 4. X3 5. A+B 6. A* B 7. AX B 8. dny/dxn 9. f （x） 10.3 a ro

11、注：1試題字跡務必清晰，書寫工整。本題頁，本頁為第頁 2題間不留空，一般應題卷分開教務處試題編號： 3務必用A4紙打印 學號：姓名 三、將下列英文翻譯成中文( 30 分) 1、Control system analysis and design can be summarized in terms of following two questio ns: (1) A nalysis: What is the performa nee of give n system in resp onse to cha nges of in puts or disturbances? (2) Design:

12、 If the performanee is unsatisfactory, how can it be improved without cha nging the process, actuator, and power amplifier blocks? 2、Stability is always the primary concern in feedback control design. But to be useful a system must also possess adequate relative stability; that is, the overshoot of

13、step resp onse must be acceptably small, and this resp onse must not be un duly oscillatory during the transient period. 3、In the in put-output relatio n C(s)二G(s)R(s), each of C,G ,and R is in gen eral a ratio of polynomials in s. Definitions: Zeros of C,G and R are the roots of their nu merator po

14、lynomials. Poles of C,G and R are the roots of their denomin ator polyno mials. System zeros and system poles are those of the system tran sfer fun cti on G(s). System characteristics polynomial is the name often used for the denominator poly no mial of G(S). System characteristic equation identifies the result if the system characteristics polyno mial is equated to zer