四川大学计算机网络考试2009年-A.doc

四川大学期 考试试题（闭卷） A卷（2009 2010 学年第 1 学期）课程号：30336020 课序号： 0 课程名称：专业英语 任课教师：杨晓梅 成绩：适用专业年级： 06级自动化本科 学生人数：118人 印题份数：125 学号： 姓名：考 试 须 知四川大学学生参加由学校组织或由学校承办的各级各类考试，必须严格执行四川大学考试工作管理办法和四川大学考场规则。有考试违纪作弊行为的，一律按照四川大学学生考试违纪作弊处罚条例进行处理。四川大学各级各类考试的监考人员，必须严格执行四川大学考试工作管理办法、四川大学考场规则和四川大学监考人员职责。有违反学校有关规定的，严格按照四川大学教学事故认定及处理办法进行处理。注意：所有答案写在答题纸上一、1. For parallel connection, the overall transfer function is simply the _of individual transfer functions.A. sum B. difference C. product D. ratio2. The Laplace transformation ratio of the output to the input for a system is called_A. behavior of the system B. transmitting functionC. transform function D. transfer function3. A secondorder system with _ larger than one is referred to as _ systemA . damping ratio B. damped frequency C. underdamping D. overdamping4. As damping ratio is . increased，the system overshoot _A. increases B. decreases C. is constant D. decays5. The steady state performance of a system is best defined of _A. error parameter B. error constant C. Steady state error D. Transient error6. If the system does not have any_, the system can be called _systemA. output B. feedback c. an open loop D. input7. The equation is called _A. differential equation B. difference equationC. derivative equation D. integral equation8. A _ is a constant velocity and is represented as r(t)=At (t=0)A. impulse input B. step input C. ramp input D. parabolic input9. In the second-order system for the damping ration s1, the system is called _ system; for s=1, the system is of _systemA. underdamping B. critical damping C. overdamping D. No damping10. The _ is used to deliver an output signal which is larger than the input signalA. subtractor B. summer C. amplifier D. divider 11. The poles are_, indicating a _processA. negative B. positive C. stable D. unstable 12. For a overdamping second-order system, its characteristic equation has two _ and _ polesA. equal B. unequal C. complex D. real13. the _ is the path from the input node to the output node without passing through any node twice.A. forward path B. feedback path C. open loop D. double-loop14. When complex poles are appeared in pair with the same real parts and the minus imaginary they are called the _ complex poles.A. real B. conjugate C. repeated D. distinct15. the poles closer to the imaginary axis are referred to as_ polesA. important B. real C. imaginary D. dominantConsidering a _（闭环系统）,the output transfer function is The _(暂态响应) of the system depends on the _(根) of the _(特征方程)。The output in _(时域) is obtained by the _(拉式反变换) of the above equation. For _(单实根) the response is an _(衰减指数)， for complex poles the response is _(振荡的)。 The same transfer function can also be formulated into _(状态空间模型)。将下列中文专业术语翻译成英文（40分）1. 经典控制理论 2. 传递函数 3. 状态空间方程 4. 微分方程 5. 拉式变换 6. 零-极点 7. 阻尼比 8. 暂态响应 9. 稳态误差 10. 超调量 11. 参考输入 12. 干扰输入 13. 反馈控制 14. 一阶系统 15. 线性动态模型 16. 特征方程 17. 阶跃响应 18. 根轨迹 19. 功率放大器 20. 稳定性 二、写出下列公式的英文读法（20分）1. 3/5: 2. 9.25： 3. 5% 4. X3 5. A+B 6. AB 7. AB 8. 9. 10. ro注：1试题字迹务必清晰，书写工整。 本题 页，本页为第 页 2 题间不留空，一般应题卷分开 教务处试题编号： 3务必用A4纸打印 学号： 姓名三、将下列英文翻译成中文（30分）1、Control system analysis and design can be summarized in terms of following two questions:(1) Analysis: What is the performance of given system in response to changes of inputs or disturbances?(2) Design: If the performance is unsatisfactory, how can it be improved without changing 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 step response must be acceptably small, and this response must not be unduly oscillatory during the transient period.3、In the input-output relation C(s)=G(s)R(s), each of C,G ,and R is in general a ratio of polynomials in s. Definitions:Zeros of C,G and R are the roots of their numerator polynomials.Poles of C,G and R are the roots of their denominator polynomials.System zeros and system poles are those of the system transfer function G(s).System characteristics polynomial is the name often used for the denominator polynomial of G(S).System characteristic equation identifies the result if the system characteristics polynomial is equated to zero. Eviden