习题二新

习题二

1. 填空题

2-1 典型的测试系统由________装置、________装置和________装置、________装置、________、________组成。

2-2 在稳态条件下，测试装置输出信号微变量d y和输入信号微变量d x之比，称之为________；

2-3 测试装置的静态特性主要以________、________和________表征。

2-4 选用仪器时应注意到：灵敏度越高，仪器的测量范围越________，其稳定性越________。

2-5 常系数线性系统的三个重要特性为________、________、_________、_______和________。

2-6 线性系统具有________保持性，即若系统输入一个正弦信号，则其稳态输出的________保持不变，但输出的________和________一般会发生变化。

2-7 测试装置的动特性在频域中是用________表示，在时域中是用________表示的。

2-8 要使一阶测试装置的动态响应快，就应使________。

2-9 要使一阶系统接近于理想系统，则要求其频率响应的要满足此条件________和________。

2-10 测试装置的脉冲响应函数h(t)就是当输入为________时装置的输出。当用h(t)来表示装置的动态特性时，输入x(t)、输入y(t)与h(t)三者的关系为________。

2-11 实现不失真测试的条件是：该测试装置的幅频特性________、相频特性________。

2-12 系统频率响应函数的定义是；在系统________为零的条件下，系统输出响应的________与输入激励的________之比。在系统的稳态分析中，它的模等于系统________与________的幅值比，其幅角等于它们的________。

2-13系统的阶跃响应是表征系统对________的响应能力；系统的频率响应则表征系统对信号中________的响应能力。

2-14 在频域中，测试装置的输出Y(S)与输入信号X(S)之间的关系是________，在时域中，测试装置输出y(t)与输入x(t)之间的关系是________。

2. 问答题

2-15 某装置对单位阶跃的响应如图4.23，试问：(1)该系统可能是什么系统？(2)如何根据该曲线识别该系统的动特性参数？

图3.23 习题4-16图

2-16 通常在结构及工艺允许的条件下，为什么都希望将二阶测试装置的阻尼率ξ定在0.7附近？

2-17 二阶系统可直接用相频特性?(ω)=90°所对应的频率ω作为系统固有频率nω的估计，这种估计值与系统的阻尼率D是否有关？为什么？

3. 计算题

2-18若压电式力传感器灵敏度为90pC/MPa ，电荷放大器的灵敏度为0.05V/pC ，若压力变化25MPa ，为使记录笔在记录纸上的位移不大于50mm ，则笔式记录仪的灵敏度应选多大？

2-19 用时间常数为2s 的一阶装置测周期为2s 、4s 的正弦信号，试求周期为4s 装置产生的幅值误差和相位滞后量分别是2s 装置的几倍？

2-20用时间常数为2s 的一阶装置测量烤箱内的温度，箱内的温度近似地按周期为160s 作正弦规律变化，且温度在 500℃～1000℃范围内变化，试求该装置所指示的最大值和最小值各是多少？

2-21 用一阶系统作200Hz 正弦信号的测量，如果要求振幅误差在l0%以内，则时间常数应取多少？如用具有该时间常数的同一系统作50Hz 正弦信号的测试，问此时的振幅误差和相位差是多少？

2-22 已知某线性装置

()ω=A ，()arctan0.1?ωω=-，现测得该系统稳态输出y (t )=10sin(30t -45°)，试求系统的输入信号x (t )。

2-23 某测量装置的频率响应函数为

1(j )10.05j H ωω=+，试问：

(1) 该系统是什么系统？ (2) 若输入周期信号()2cos100.8cos(10030)=+-o x t t t ，试求其稳态响应y(t )。

3-29 用时间常数为0.5的一阶装置进行测量，若被测参数按正弦规律变化，若要求装置指示值的幅值误差小于2%，问被测参数变化的最高频率是多少？如果被测参数的周期是2s 和5s ，问幅值误差是多少？

2-24已知某测试系统传递函数

()110.5=+H s s ，当输入信号分别为1sin x t =π，2sin 4x t =π时，试分别

求系统稳态输出，并比较它们幅值变化和相位变化。

2-25 一种力传感器可作为二阶系统处理。已知传感器的固有频率为800Hz ，阻尼率为0.14。问使用该传感器作频率为500Hz 和1000Hz 正弦变化的外力测试时，其振幅和相位角各为多少？

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一 1、对于网络课程，学生不仅可以选择何时何地地学习，在回答问题之前他们还可以有时间思考答案。（not only...but also...) 2、网上学习的想法使她非常兴奋，而她认为网上学习毫无意义和用处。（while） 3、与以英语为母语的人交谈是非常有益的体验，从中我们能学到许多东西（communicate with） 4、如今，越来越多的人可以利用互联网查找他们需要的信息。（have access to） 5、他要她放弃工作在家照顾孩子，但是她觉得这个要求太过分了。（give up） 6、既然我们已尽学完了这门课程，就应该多做些复习。（now that） 1. Not only can students choose when and where to learn for an online course, but they can also take time to think through answers before making a reply. 2. She is excited by the idea of online learning while be considers it meaningless and useless. 3. Communicating with native English speakers is a very rewarding experience from which we can learn a lot. 4. Today, more and more people have access to the Internet through which they look for the information they need. 5. He wants her to give up working and stay home to look after the children. She feels, however, that this is too much for her. 6. Now that we have finished the course, we shall start doing more revision work. 二 1、当她就要关掉音乐时，她父亲冲进她的房间，朝着她喊道：“难道你就不能把音乐关小一点？” 2、酒吧老板一直在看那个姑娘跳舞，一面却假装没有看。 3、桑迪如此喜欢摇滚以至不顾父亲的反对而将音量放大。 4、像往常一样，当他的父母不喜欢他的穿着时，便开始唠叨他。 5、在会上，他们讨论了如何保持师生间的沟通渠道畅通。 6、一想到这些年幼的男孩和女孩被父母强迫沿街讨钱我就生气。 1. As she was about to turn off the music, her father burst into he room and shouted at her, “Can’t you turn down the music a little bit?" 2. the owner of the bar kept watching the girl dancing while pretending not to. 3. Rock music appealed to Sandy so much that she turned it up, paying no attention to her father’s objection. 4. As usual, when his parents don’t like what he wears, they start bugging him. 5. At the meeting they discussed how to keep the lines of communication open between teachers and students. 6. It makes my blood boil to think of these young boys and girls who are forced by their parents to beg for money along the streets. 三 1、即使报酬并不优厚，我还是觉得接受那个新职位。 2、这项工作在实际开始干之前，一直被认为是十分简单的 3、既然你计划移居加拿大，你就必须努力适应冬季的严寒天气。 4、他承诺帮助我们买下那幢房子，但有点勉强。

新视野大学英语读写教程第二版课后习题答案1-4册

新视野大学英语（第2版）第1册Unit1答案 III. 1. rewarding 2. communicate 3. access 4. embarrassing 5. positive 6. commitment 7. virtual 8. benefits 9. minimum 10. opportunities IV. 1. up 2. into 3. from 4. with 5. to 6. up 7. of 8. in 9. for 10.with V. 1.G 2.B 3.E 4.I 5.H 6.K 7.M 8.O 9.F 10.C Sentence Structure VI. 1. Universities in the east are better equipped, while those in the west are relatively poor. 2. Allan Clark kept talking the price up, while Wilkinson kept knocking it down. 3. The husband spent all his money drinking, while his wife saved all hers for the family. 4. Some guests spoke pleasantly and behaved politely, while others wee insulting and impolite. 5. Outwardly Sara was friendly towards all those concerned, while inwardly she was angry. VII. 1. Not only did Mr. Smith learn the Chinese language, but he also bridged the gap between his culture and ours. 2. Not only did we learn the technology through the online course, but we also learned to communicate with friends in English. 3. Not only did we lose all our money, but we also came close to losing our lives. 4. Not only do the workers want a pay increase, but they also want reduced working hours. 5. Not only is the house expensive, but it is also too far away from my company. Translation VIII. 1. Not only can students choose when and where to learn for an online course, but they can also take time to think through answers before making a reply. 2. She is excited by the idea of online learning while be considers it meaningless and useless. 3. Communicating with native English speakers is a very rewarding experience from which we can learn a lot. 4. Today, more and more people have access to the Internet through which they look for the information they need. 5. He wants her to give up working and stay home to look after the children. She feels, however, that this is too much for her. 6. Now that we have finished the course, we shall start doing more revision work. IX. 1. 我永远都不会忘记那位老师，是他告诉我学外语是有趣的、有价值的。如果没有他，我的英语说得不会像现在这样好。 2 没有任何其他语言能像英语那样让你感受到多姿多彩的世界文化。有了过硬的英语知识，你就可以体验奇妙的文化之旅。 3. 写作不仅仅要写老师布置的话题，而且要写自己感兴趣的东西，例如，给朋友写电子邮件。 4. 远程教学课程是指授课者与学生通过计算机通信技术进行交流的课程。 5. 英语不但是世界上最有用的语言，也是世界上最易学、易用的语言之一。 6远程教学课程在时间安排上给予学生更多的自由，但与其他课程比，这些课程要求学生有更强的自律能力。Cloze 1. B 2.A 3.B 4.B 5.C 6,C 7.B 8.A 9.a 10.B 11.A 12.A 13.B 14.A 15.B Structured Writing XII. I am proud to say that I succeeded in learning a foreign language. It was a real challenge and, needless to say, it took a lot of practice. I carried a small dictionary with me everywhere I went as well as a notebook in which I listed new words I came across. I also managed my time carefully so that I met the standards of the course and finished assignments on time. After years of persistence, I reaped the benefits of all my hard work. Section B Reading Skills 1. 1.C 2.B 3.D 4. A 5. B Comprehension of the Text II. 1.C 2.A 3.B 4.C 5.D 6.B 7.C 8.D Vocabulary 1. community 2. effective 3. unique 4. committed 5. reinforce 6. perspective 7. explicit 8. challenge 9. hindered 10. arose IV. 1. for 2. with 3. on 4. on 5. on 6. of 7. in 8. up 9. of 10.In

新视野大学英语读写教程1-第二版课后练习答案

新视野大学英语（第2版）第1册Unit 1答案 (1) 新视野大学英语（第2版）第1册Unit 2答案 (2) 新视野大学英语（第二版）第1册Unit 3答案 (3) 新视野大学英语（第二版）第1册Unit 4答案 (4) 新视野大学英语（第二版）第1册Unit 5答案 (5) 新视野大学英语（第二版）第1册Unit 6答案 (7) 新视野大学英语（第二版）第1册Unit 7答案 (8) 新视野大学英语（第二版）第1册Unit 8答案 (9) 新视野大学英语（第2版）第1册Unit 9答案 (10) 新视野大学英语（第2版）第1册Unit 10答案 (11) 新视野大学英语（第2版）第1册Unit 1答案 III. 1. rewarding 2. communicate 3. access 4. embarrassing 5. positive 6. commitment 7. virtual 8. benefits 9. minimum 10. opportunities IV. 1. up 2. into 3. from 4. with 5. to 6. up 7. of 8. in 9. for 10.with V. 1.G 2.B 3.E 4.I 5.H 6.K 7.M 8.O 9.F 10.C Sentence Structure VI. 1. Universities in the east are better equipped, while those in the west are relatively poor. 2. Allan Clark kept talking the price up, while Wilkinson kept knocking it down. 3. The husband spent all his money drinking, while his wife saved all hers for the family. 4. Some guests spoke pleasantly and behaved politely, while others wee insulting and impolite. 5. Outwardly Sara was friendly towards all those concerned, while inwardly she was angry. VII. 1. Not only did Mr. Smith learn the Chinese language, but he also bridged the gap between his culture and ours. 2. Not only did we learn the technology through the online course, but we also learned to communicate with friends in English. 3. Not only did we lose all our money, but we also came close to losing our lives. 4. Not only do the workers want a pay increase, but they also want reduced working hours. 5. Not only is the house expensive, but it is also too far away from my company. Translation VIII. 1. Not only can students choose when and where to learn for an online course, but they can also take time to think through answers before making a reply. 2. She is excited by the idea of online learning while be considers it meaningless and useless. 3. Communicating with native English speakers is a very rewarding experience from which we can learn a lot. 4. Today, more and more people have access to the Internet through which they look for the information they need. 5. He wants her to give up working and stay home to look after the children. She feels, however, that this is too much for her. 6. Now that we have finished the course, we shall start doing more revision work. IX. 1. 我永远都不会忘记那位老师，是他告诉我学外语是有趣的、有价值的。如果没有他，我的英语说得不会像现在这样好。 2 没有任何其他语言能像英语那样让你感受到多姿多彩的世界文化。有了过硬的英语知识，你就可以体验奇妙的文化之旅。 3. 写作不仅仅要写老师布置的话题，而且要写自己感兴趣的东西，例如，给朋友写电子邮件。 4. 远程教学课程是指授课者与学生通过计算机通信技术进行交流的课程。 5. 英语不但是世界上最有用的语言，也是世界上最易学、易用的语言之一。 6远程教学课程在时间安排上给予学生更多的自由，但与其他课程比，这些课程要求学生有更强的自律能力。Cloze 1. B 2.A 3.B 4.B 5.C 6,C 7.B 8.A 9.a 10.B 11.A 12.A 13.B 14.A 15.B Structured Writing XII. I am proud to say that I succeeded in learning a foreign language. It was a real challenge and, needless to say, it took a lot of practice. I carried a small dictionary with me everywhere I went as well as a notebook in which I listed new words I