文档库 最新最全的文档下载
当前位置:文档库 › 《大学英语》第一次作业

《大学英语》第一次作业

《大学英语》第一次作业
《大学英语》第一次作业

一、单项选择题。本大题共40个小题,每小题2.5 分,共100.0分。在每小题给出的选项中,只有一项是符合题目要求的。

1.—I’d like to know something about your life in Paris.

—________________

( C )

A.You can tell me

B.I wonder if you can

C.I’ll tell you

D.I wonder if you could

2.—What do you want to do?

—________________.

( B )

A.No, I don’t want to do anything.

B.I want to watch TV for a change.

C.What do you want to do then?

D.How about having a picnic?

3.—Would you like to have dinner with me tonight?

—________________.

( C )

A.Yes, I would.

B.No, thank you.

C.I’d love to, but I have a meeting to attend tonight.

D.Sorry, I can’t

4.—Come to our house for a party, please.

—________________.

( C )

A.Here’s my address

B.I’m not busy

C.Oh, thank you for your kindness

D.See you at four tomorrow

5.—I wonder if you could help me.

—________________.

( D )

A.I could

B.Yes, I do

C.No, not at all

D.Of course

6.—Would you mind shutting the door?

—________________.

( B )

A.Yes, please.

B.Not at all

C.No, I’m sorry

D.All right

7.—Do you mind if I read the newspaper on the table?

—________________.

( B )

A.Good news for you

B.Go ahead, please

C.Yes, sure

D.No, I can’t

8.— Can I help you with your suitcase?

—________________.

( D )

A.I have no idea

B.No, no. I can carry it myself

C.That’s a good idea

D.Thank you. I can manage myself

9.—Will you do me a favor?

—________________.

( D )

A.My pleasure.

B.Yes, I do.

C.Yes, I will

D.I’d be glad to

10.—Excuse me, would you lend me your calculator?

—________________.

( A )

A.Certainly. Here you are

B.Please don’t mention it

C.It’s nothing

D.Yes, I have a hand

11.He was _______ all of his best friends.

( C )

https://www.wendangku.net/doc/7513666616.html,ughed by

https://www.wendangku.net/doc/7513666616.html,ughed at

https://www.wendangku.net/doc/7513666616.html,ughed at by

https://www.wendangku.net/doc/7513666616.html,ughing at

12.After the Minister of Education had finished speaking at the press

conference, he was made _______ all sorts of awkward questions.

( D )

A.answer

B.answering

C.answered

D.to answer

13.The roof of our house is broken, so it needs _______.

( B )

A.repaired

B.repairing

C.being repaired

D.to repair

14._______ a teacher in a university, it is necessary to have at least a

master’s degree.

( A )

A.To become

B.Become

C.One becomes

D.On becoming

15.The doctor advised her _______ enough rest before going back to work.

( B )

A.get

B.to get

C.gets

D.got

16.The workers are busy _______ models for the exhibition(展览).

( D )

A.to make

B.with making

C.being making

D.making

17.He spoke so loudly _______ be heard by all.

( C )

A.that could

B.in order

C.as to

D.to

18.It is necessary _______ a foreign language.

( B )

A.of college students to master

B.for college students to master

C.that college students master

D.that college students to master

19.Henry would never forget _______ his mother-in-law for the first time.

He was so pleased with the gifts she brought for him.

( C )

A.meet

B.to meet

C.meeting

D.met

20.Do you know the man _______ under the apple tree?

( C )

https://www.wendangku.net/doc/7513666616.html,y

https://www.wendangku.net/doc/7513666616.html,in

C.lying

https://www.wendangku.net/doc/7513666616.html,ying

21._______ a reply, he decided to write again.

( C )

A.Not receiving

B.Receiving not

C.Not having received

D.Having not received

22.That T-shirt was so tight that he decided to have it _______.

( C )

A.be enlarged

B.enlarge

C.enlarged

D.to enlarge

23._______ at such a time, his work attracted much attention.

( B )

A.To publish

B.Published

C.Publishing

D.To be published

24._______ from space, we can find that our earth looks like a“blue planet”.

( B )

A.Seen

B.Seeing

C.Having seen

D.To see

25.The manager has his employees _______ a business report every week.

( D )

A.to write

B.written

C.writing

D.write

26.I found _______ pleasant walking along the river after supper.

( C )

A. this

B.that

C.it

D.which

27.You’d better take an u mbrella with you _______ it should rain.

( B )

A. in case of

B.in case

C.because

D.when

28._______ you have decided to get married, you should shoulder the

family responsibilities.

( B )

A.Although

B.Once

C.Or

D.Unless

29.It _______ that I met one of my old classmates on my way home yesterday.

( D )

A.took place

B.occurred

C.broke out

D.happened

30.The old woman next door is very keen _______ growing roses.

( C )

A.to

B.with

C.on

D.at

31.The atmosphere _______ certain gases mixed together in definite proportions.

( C )

https://www.wendangku.net/doc/7513666616.html,poses of

B.is made up

C.consists of

D.makes up of

32.He didn’t have time to read the report word for word. He just _______ it.

( A )

A.skimmed

B.observed

C.overlooked

D.glanced

33.He _______ at the thought of seeing the pretty girl again.

( B )

A.cheered off

B.cheered up

C.cheerful

D.cheered on

34.Knowing first aid (急救) is _______ to saving lives.

( C )

A.cure

B.cruel

C.crucial

D.crude

35.He _______ whether he should make one last attempt to save the man.

( D )

A.paused

B.stopped

C.waited

D.hesitated

36.John speaks French as fluently as he does German.

( C )

A.约翰会说法语,也会说德语。

B.约翰法语没有德语讲得好。

C.约翰法语和德语说得一样流利。

D.约翰在说德语的时候,也会同时说法语。

37.Tom was such a hardworking student that he soon came out first in the

class.

( D )

A.汤姆是如此勤奋的学生,他第一个从教室里走出来。

B.汤姆学习很勤奋, 他第一个交卷。

C.汤姆是个好学生,他成了班上第一名。

D.汤姆学习如此勤奋,以至于他不久就成了班上成绩最好的学生。

38. A lot of natural resources in the mountain area are to be exploited and

used.

( A )

A.那个山区有许多自然资源有待于开发利用。

B.很多人到山区去开发和利用自然资源。

C.山区的许多自然资源已经被开发利用了。

D.山区的许多自然资源被掠夺了。

39.I would never stand in the way of my children becoming free and

independent.

( C )

A.我是绝不会站在孩子门走向自由和独立的道路中间的。

B.我是绝不会阻碍儿女们,让自己变得自由和独立的。

C.我是绝不会阻碍儿女门走向自由和独立的。

D.我是绝对不会站在孩子们的立场,考虑他们如何变得自由和独立

的。

40.To her relief, the doctor said she could resume working immediately after

she left hospital.

( B )

A.让她感到欣慰的时,医生说她马上就可以出院并继续工作。

B.让他感到欣慰的是,医生说她出院后可以马上恢复工作。

C.让她深信不疑的是,医生说她出院后马上可以恢复工作。

D.让她深信不疑的是,医生说可以让她马上出院继续工作。

英语网上作业

Part 1 Multiple Choice (每小题:1 分) Directions: Choose the best answer from the four choices marked A, B, C and D. 1.Actually, humor helps make products more ________ to consumers. A. available B. sensible C. feasible D. accessible 2.Just as the increase of fax machines, wireless phones and personal computers has caused a shortage of phone numbers, heavy use of the Internet is _____ the supply of numerical (数字的) Internet addresses. A. draining B. soaking C. absorbing D. drying https://www.wendangku.net/doc/7513666616.html,pared with what I saw 10 years ago, ads today are becoming increasingly _______. A. sophisticated

C. philosophical D. physical 4.According to the recent report, 10 years ago about one in seven people in this country spoke a language ________ English at home. A. rather than B. other than C. regardless of D. except for 5.Dolly's creators at Edinburgh's Roslin Institute boasted she ____ the promise of animals that could produce drugs and organs for humans. A. contained B. emphasized C. packed D. embodied 6.If, one day, it was possible to direct stem cells to become selected types of replacement tissue, it could be used to ________ a host of diseases which at present are incurable.

大学英语(4)全套(含答案)_华东理工大学在线作业

第1题、It is not that I do not like plays. The reason why I did not go to the theater last night was that I could not ___ the time. A、offer B、leave C、afford D、manage 标准答案:C 第2题、To speak English well, ___. A、much practice is needed B、one needs much practice C、much practice is needed by one D、one is needed much practice 标准答案:B 第3题、The material produced in China ___ easily. A、is washed B、washes C、washing D、are washing 标准答案:B 第4题、I am pleased to take ___ to exchange views with you. A、this opportunity B、a chance C、this time D、a period 标准答案:A 第5题、It is required ___ me that I give evidence. A、of B、from C、for D、with 标准答案:A 第6题、Canned foods are ___ with housewives because it takes so little time to cook them. A、popular B、welcome C、desirable D、usual 标准答案:A

(全)大学英语作业

大学英语(一) 第一次作业 (1):Eggs, though rich in nourishments, have ____D____ of fat. a. the large amount b. the large number c. a large number d. a large amount (2):____B____the War of , the was an English colony. a. Between b. In c. At d. Before (3):Robert, there's a man at the front door, saying he has ____A____news of great importance. a. / b. an c. a d. the (4):The baby is hungry,but there's ____D____ milk in the bottle. a. few b. a few c. a little d. little (5):The policeman gave the thief a blow in ____B____ stomach. a. / b. the c. his

d. that (6):Our house is about a mile from the railway station and there are not many houses ____D_____. a. far apart b. among them c. from each other d. in between (7):I am not used to speaking ____B____ public. a. to b. in c. at d. on (8):I'll have a cup of coffee and ____C____. a. two breads b. two pieces of breads c. two pieces of bread d. two piece of breads (9):They were the only men who received votes ____C____me. a. accept b. unless c. besides d. next (10):____B____ girl dressed _____ black is her sister Rose. a. The; on b. The; in c. A; in d. A; on

重庆大学有限元第一次作业

有限元分析技术课程大作业 科 目:有限元分析技术 教 师: 姓 名: 学 号: 专 业: 机械设计及理论 类 别: 学 术 上课时间: 2016 年 11 月至 2017 年 1 月 考 生 成 绩: 阅卷评语: 阅卷教师 (签名) 重庆大学研究生院

第一章 问题提出 1.1工程介绍 某露天大型玻璃平面舞台的钢结构如图1所示,每个分格(图2中每个最小的矩形即为一个分格)x 方向尺寸为1m ,y 方向尺寸为1m ;分格的列数(x 向分格)=学生序号的百位数值×10+十位数值+5,分格的行数(y 向分格)=学生序号的个位数值+4,如序号为041的同学分格的列数为9,行数为5,111号同学分格的列数为16,行数为5。 钢结构的主梁(图1中黄色标记单元)为高160宽100厚14的方钢管,其空间摆放形式如图3所示;次梁(图1中紫色标记单元)为直径60厚10的圆钢管(单位为毫米),材料均为碳素结构钢Q235;该结构固定支撑点位于左右两端主梁和最中间(如不是正处于X 方向正中间,偏X 坐标小处布置)的次梁的两端,如图2中标记为UxyzRxyz 处。 玻璃采用四点支撑与钢结构连接(采用四点支撑表明垂直作用于玻璃平面的面载荷将传递作用于玻璃所在钢结构分格四周的节点处,表现为点载荷,如图4所示);试对在垂直于玻璃平面方向的22 /KN m 的面载荷(包括玻璃自重、钢结构自重、活载荷(人员与演出器械载荷)、风载荷等)作用下的舞台进行有限元分析.(每分格面载荷对于每一支撑点的载荷可等效于0.5KN 的点载荷)。 1.2 作业内容 (1)屏幕截图显示该结构的平面布置结构,图形中应反映所使用软件的部分界面,如图1-2; (2)该结构每个支座的支座反力; (3)该结构节点的最大位移及其所在位置; (4)对该结构中最危险单元(杆件)进行强度校核。 图1-1

最新英语在线作业1.pdf

1.Our manager will look into the matter as soon as possible. Just have a little ____. A wait B time C patience D rest 正确答案:C 词汇与结构2013 2.There will be _______ soon. I’m afraid I can’t go. A rain B rainy C raining D rains 正确答案:A 词汇与结构2013 3.I am not used to speaking ______ public. A in B at C on D to 正确答案:A 交际英语2013 4.--I wonder if I could use your computer tonight.--_____________. I’m not using it right now. A Sure, so ahead. B I don’t’ know. r. C It doesn’t matte

D Who cares? 正确答案:A 词汇与结构2013 5.I don’t know the park, but it’s ______ to be quite beautiful. A said B told C spoken D talked 正确答案:A 词汇与结构2013 6.The teacher came into the classroom, ______ a thick book in her hand. A have B to have C having D had 正确答案:C 交际英语2013 --_______________. 7.--Hey, Tom, what’s up? A Yes, definitely! B Oh, not much. C What is happening in your life? D You are lucky. 正确答案:B 词汇与结构2013 8.It is ______ that an accidental meeting makes a lifelong friendship.

大学英语(c)在线作业答案

单选题 1.《长沮桀溺耦而耕》文中,夫子怃然曰:“鸟兽不可与同群,吾非斯人之徒与而谁与?天下有道,丘不与易也。”孔子所说“斯人”是指()。 A 桀溺 B 子路 C 世人 D 自己 正确答案:C 单选题 2.《组织管理的技术——系统工程》是一篇宏观性质的科普作品,不像科学小品,可从科学现象点滴生发开去;也不能如科幻作品,展开幻想翅膀高飞。它既有严格的科学性,用准确、通俗的文字高度概括地介绍系统工程的知识;又深入浅出,(),寓繁于简,以鲜明的观点、丰富的内容、醒目的标题豁人耳目,使外行乐意领教。 A 小题大做 B 以一总万 C 大题小做 D 另辟蹊径 正确答案:C 单选题 3.“康桥”也就是我们今天所译的“剑桥”,英国剑桥大学所在地。康桥象征诗人对“爱”、“美”、“自由”的单纯信仰,对青春的留恋,对理想的执着,是人生中最美好的青春梦幻之地。康桥求学是徐志摩人生中最美丽的一段时光,其时他对诗歌发生浓厚的兴趣,走上文学的道路。重返故地,牵引起他无数关于青春、理想、还有对过去飘逸洒脱生活方式的甜蜜回忆。诗中重墨浓彩写的是()。 A 对青春的留恋 B 对理想的执着 C 大学学习生活 D 康河景观 正确答案:D 单选题 4.韩愈(768-824)字退之,河内河阳人(今河南省孟县)。韩氏自称郡望昌黎,每自称韩昌黎,故后世称他为韩昌黎。他倡导了古文运动,其文遒劲有力,条理畅达,语言精炼,各

体兼长,为古代杰出散文家,位列“唐宋()”之首。 A 名家名人 B 散文家 C 八大家 D 古文家 正确答案:C 单选题 5.《饮食男女》是李安父亲三部曲(《推手》和《喜宴》)中的最后一部。和前两部一样,李安在这部电影中展现的仍然是中国传统与现代撞击中的()家庭生活细节。李安对家庭剧有着明显的偏爱,这大概源于他自己独特的对于家庭的感受,很善于从小处见大,从看似简单的家庭情节剧中挖掘出深刻的精神内涵。在《饮食男女》这部影片里,李安没有把三个女儿简单地设置老朱的对立面,而是通过一个个生动的细节,将三个女儿的个性都表现出来了。每个女儿都有自己的问题,她们在内心都有一种逃离家庭建立新家庭的欲望,但在中国传统文化的桎梏下,人人对性的问题都讳莫如深,但这个传统家庭却最后喜剧性地毁于这种人人心中都存在的儿女私情。 A 台湾高雄 B 台湾乡村 C 台湾城市 D 台湾台北 正确答案:D 单选题 6.《前赤壁赋》中作者写景抒情由情入理生动地抒发的不重得失的豁达乐观的情怀。文中他以()阐明变与不变的哲理:客亦知夫水与月乎?逝者如斯,而未尝往也;盈虚者如彼,而卒莫消长也。盖将自其变者而观之,则天地曾不能以一瞬;自其不变者而观之,则物与我皆无尽也,而又何羡乎?且夫天地之间,物各有主。苟非吾之所有,虽一毫而莫取。惟江上之清风,与山间之明月,耳得之而为声,目遇之而成色。取之无禁,用之不竭。是造物者之无尽藏也,而吾与子之所共适。 A 主客问答 B 清风明月 C 人生感悟 D 以景拟人 正确答案:A

大学英语作业

大学英语作业 成教大学英语考试试卷A I. Fill in the blanks with the words given below. Change the form where necessary:20% estimate shy stick valuable enter tradition pour hurry adventure population communicate period 1. Lucy was ______ and quiet while her brother was sure and noisy. 2. Thank you for your ________ time, experience and service as well. 3. We ______ by letter in these days. 4. We have to wait for a ________ of time and then we will ask the people in charge to give us answers. 5. He _____ the profession (职业) after 4 years at college. 6. It is _______ that about a third of the population of Germany died in the two world wars. 7. He loves his job because it offers __________ , travels, and experience. 8. The city has a ________ of ten million. 9. He stood there, watching the rain _______ down the windows. 10. He _______ to get there and tell his wife before the police arrived. II. Choose the correct answer. 30% 1( I had hoped _____ my letter. A. her to answer B. that she answer C. that she would answer D. her answering

现代设计方法(关于有限元)作业

《现代设计方法》作业关于有限元法的研究 学院:机械工程学院 专业:机械制造及其自动化

0.有限元法 有限元法分析起源于50年代初杆系结构矩阵的分析。随后,Clough于1960年第一次提出了“有限元法”的概念。其基本思想是利用结构离散化的概念,将连续介质体或复杂结构体划分成许多有限大小的子区域的集合体,每一个子区域称为单元(或元素),单元的集合称为网格,实际的连续介质体(或结构体)可以看成是这些单元在它们的节点上相互连接而组成的等效集合体;通过对每个单元力学特性的分析,再将各个单元的特性矩阵组集成可以建立整体结构的力学方程式,即力学计算模型;按照所选用计算程序的要求,输入所需的数据和信息,运用计算机进行求解。 当前,有限元方法/理论已经发展的相当成熟和完善,而计算机技术的不断革新,又在很大程度上推进了有限元法分析在工程技术领域的应用。然而,如此快速地推广和应用使得人们很容易忽视一个前提,即有限元分析软件提供的计算结果是否可靠、满足使用精度的前提,是合理地使用软件和专业的工程分析。有限元法分析一般包括四个步骤:物理模型的简化、数学模型的程序化、计算模型的数值化和计算结果的分析。每一个步骤在操作过程中都或多或少地引入了误差,这些误差的累积最终可能会对计算结果造成灾难性的影响,进而蒙蔽我们的认识和判断。 1.受内压空心圆筒的轴对称有限元分析 例图1.1所示为一无限长的受内压的轴对称圆筒,该圆筒置于内径为120mm的刚性圆孔中,试求圆筒内径处的位移。结构的材料参数

为:200 =,0.3 E GPa μ=。 图1 结构图 对该问题进行有限元分析的过程如下。 (1)结构的离散化与编号 由于该圆筒为无限长,取出中间一段(20mm高),采用两个三角形轴对称单元,如图1.2所示。对该系统进行离散,单元编号及结点编号如图1.3所示,有关结点和单元的信息见表1.1。 图1.2 有限元模型

开放式英语2在线作业答案

开放英语2在线作业答案 1、Don't let _______ in. The doctor is operating on the patient now. A anyone B someone C nobody 2、Will she _______ do the work? A be able to B able to C is able to 3、She _______ jogging every morning. A goes B does C plays 4、_______ a glass of coffee.A I'd rather haveB I haveC I prefer to 5、Where's _______ newspaper? A today B today 's C todays' 6、I don't like coloured clothes. I like white_______. A ones B one C any 7、Have you got any books on Chinese painting? I want to borrow _______. A any B every C one 8、He likes _______ football very much. A playing B to play C play 9、Money isn't _______. A anything B something C everything 10、My parents work very hard in the farm. They _______ get up early in the morning. A occasionally B sometimes C always 11、June 1st is _______ Day.A Children'sB Childrens'C Children 12、I _______ don't understand. Could you say it again? A still B yet C as well 13、We always _______ the neighbours' cat while they're away. A take care B look after C look at 14、She _______ in America for many years. She hopes to go back toChina next year. A lives B lived C has lived 15、I am getting on very well _______ the new job. A with B on C in

大学英语2第2阶段在线作业

?A) Yes,I can. ?B) Here you are. ?C) Sorry,I don’t think so. ?D) You can take it. ?A) showed ?B) has shown ?C) will show ?D) is showing 参考答案:B 解析: 无

?A) which ?B) where ?C) when ?D) that ?A) will leave ?B) leaves ?C) will have left ?D) left

—________. ?A) I want a kilo of apples ?B) You can go your own way ?C) Thanks ?D) Excuse me. I’m busy ?A) was having ?B) have ?C) have ever had ?D) had ever had ?A) of whom only 20 of these

?B) only 20 who ?C) of 20 of these who ?D) only 20 of whom ?A) Sorry,he is busy at the moment ?B) No,you can’t ?C) Sorry,you can’t ?D) I don’t know ?A) should be hurt ?B)

is hurt ?C) will be hurt ?D) is to be hurt ?A) Sorry. He’s in at the moment. ?B) Why didn’t you call earlier? ?C) Certainly. May I have your name? ?D) D. Sorry. He doesn’t want to see you. ?A) rain

大学英语作业答案完整版

Exercises 1.When and where shall we ___A____. A.meet B. met C. to meet D. meeting A.You __D_____show more respect for your elders. A.can B. could C. would D. must 3. It is necessary that I ___D____ return the books to him tomorrow. A. will B. can C. may D. should 4. She __B_____ to school by school bus at eight in the morning. A. go B. goes C. went D. gone 5. What __C_____the notice say? A. is, say B. is, said C. did, say D. does, say 6. I’ll tell her after Ruby __B____. A. leave B. leaves C. left D. is leaving 7. We __D_____ the result tomorrow. A. know B. knew C. has known D. will know 8. On November 1 we __D_____ in this house for thirty years. A. live B. will have C. are living D. will have been living 9. It __B_____ to rain soon. A. is B. is going C. will D. shall 10. Mary ___C_____ a dress when she cut her finger.

秋华师英语在线作业答案

?I’ll?ask?Mr.?Smith?to?ring?you?up?(??????)?he?comes?back?to?the?office. A. when B.where 答案:A 您的答案:A 题目分数: 此题得分: ? 2.第2题 You never told us why you were one hour late for the last meeting,(?? )? ’t you ’t you you you 答案:D 您的答案:D 题目分数: 此题得分: ?

Students sometimes support themselves by()of evening jobs. A.. ways 答案:C 您的答案:C 题目分数: 此题得分: ? 4.第4题 alice received an invitation from her boss,()came as a surprise. 答案:C 您的答案:C 题目分数: 此题得分: ?

The computer center,()last year, is very popular among the students in this school. opened 答案:D 您的答案:D 题目分数: 此题得分: ? 6.第6题 the americans and the british not only speak the same language but also ()a large number of social customs. 答案:A 您的答案:A 题目分数: 此题得分: ?

《大学英语三》在线作业答案题库

《大学英语(三)》在线作业题库 一、单选题(共 50 道试题,共 100 分。) 1. – Ami, I want this report typed today. – ( ). A. It'll be ready in the afternoon, sir B. I'd like you to help me C. I know nothing about the report D. Leave it to tomorrow 正确答案:A 2. He( )himself quickly to the new condition of his work. A. changed B. altered C. adjusted D. varied 正确答案:C 3. We( )the bathroom and plan( )the bedroom this year. A. painted…to paint B. is painting… painting C. paint… to paint D. have painted…to paint 正确答案:D 4. I don't think this kind of medicine has any( ). A. answer B. cause C. effect D. work 正确答案:C 5. We consider( )the instrument be adjusted each time it is used. A. that it necessary B. it necessary that C. necessary that D. necessary of it that 正确答案:B 6. – I wonder if you could help me. – ( ). A. I could B. Yes, I do C. No, not at all D. Of course 正确答案:D 7. Parliament didn't think the Prime Minister did enough in the improvement of fair employment, ( )he was asked to write to Parliament for further explanation. A. so B. therefore

大学英语作业

大学英语作业 成教大学英语考试试卷 A I. Fill in the blanks with the words given below. Change the form where necessary:20% estimate shy stick valuable enter tradition pour hurry adventure population communicate period 1. Lucy was ________ and quiet while her brother was sure and noisy. 2. Thank you for your _________ time, experience and service as well. 3. We _______ by letter in these days. 4. We have to wait for a __________ of time and then we will ask the people in charge to give us answers. 5. He _______ the profession (职业) after 4 years at college. 6. It is ________ that about a third of the population of Germany died in the two world wars. 7. He loves his job because it offers ____________, travels, and experience. 8. The city has a _________ of ten million. 9. He stood there, watching the rain _________ down the windows. 10. He ________ to get there and tell his wife before the police arrived. II. Choose the correct answer. 30% 1( I had hoped _______ my letter. A. her to answer B. that she answer C. that she would answer D. her answering

有限元大作业

风电主轴承有限元分析 XXX 摘要:基于有限元法在接触问题中的应用,对风电主轴承进行非线性分析。以轴承外圈的内表面和内圈的外表面为目标面,以滚子为接触面创建接触对分析滚子的接触应力情况。最大应力值出现在滚子边缘出,对最大承载滚子环向接触应力分析表明,有限元分析结果与理论计算结果相近,验证了利用有限元法分析风电主轴承应力状态的可行性。 关键词:风电主轴承;接触应力;有限元分析 0 引言 随着传统能源的日益枯竭以及环境污染问题愈发严重,风能作为一种清洁的的可再生能源近些年受到越来越多的关注。风力发电技术已广泛运用于世界各地。一些发达国家风力发电产业已得到了迅猛发展,技术日趋成熟,并开始走向产业化规模化发展阶段[1-3]。 风电主轴承是风力发电机重要的组成部分。其结构形式图下图1所示。据统计,如今安装的所有风力发电机中,采用主轴轴承支撑原理的占总数的75-80%[4],这种支撑是轴承内圈安装在旋转的主轴上,外圈固定在单独的轴承座上,相对于圆锥滚子轴承或圆柱滚子轴承来说,主轴轴承位置处轴产生变形,需要轴承具有一定的调心作用,所以都采用了调心滚子轴承。近年来由于计算机技术的飞速发展,轴承的受力分析计算已经普遍采用有限元分析的方法,能够准确合理地解决轴承复杂的非线性接触问题,为轴承的分析和计算提供了一种新的方法,成为未来的一个发展方向。在机械设备的设计过程中,对受力较大且复杂的零件进行受力分析,校核其整体和局部强度并进行合理的布局设计,是为了防止因应力过大而导致在实际工作中损坏或寿命降低[5]。本文主要运用ANSYS Workbench有限元软件对风电主轴承进行静力学计算,分析轴承内部结构参数对轴承载荷分布和最大接触应力的影响规律。 图1 风电主轴承结构及安装图 1 有限元分析过程 1.1 风电轴承有限元分析基本步骤 不同的物理性质和数学模型的问题,有限元法求解的基本步骤是相同的,只不过 具体公式推导和运算求解不尽相同。有限元分析求解问题的基本计算步骤[6]: 1.问题及求解域定义; 2.求解域离散化; 3.确定状态变量及控制方法; 4.单元推导;

大学英语3第3阶段在线作业

1分) 0.0 No matter ______, the little sisters managed to round the sheep up and dri ve them back home safely. A) it was snowing hard B) hard it was snowing C) how it was snowing hard D) how hard it was snowing 参考答案:D 收起解析 解析: 无 2分) 0.0 —Is it possible for you to work late tonight —_______ A) I like it. B) I’ll do that C)

I’d love to. D) I think so. 参考答案:D 收起解析 解析: 无 3分) 0.0 People at the party worried about him, because no one was aware _______ he had gone. A) of where B) of the place where C) where D) the place 参考答案:A 收起解析 解析: 无 4分) 5.0 This kind of material expands _______ the temperature increasing. A) to B) for

with D) at 参考答案:C 收起解析 解析: 无 5分) 5.0 —Unbelievable! I have failed the driving test again! —_______ This is not the end of the world. A) Good luck. B) Cheer up. C) Go ahead. D) No problem. 参考答案:B 收起解析 解析: 无 6分) 0.0 ______ the War of Independence, the United States was an English colony.

大学英语II一次作业

1. –Is there anything I can do for you? (B) I’m looking for a blue raincoat, size 36. 2. –That’ll be twenty-six dollars. (A) How much will that be altogether? 3. –I want to buy a silk tie with white and black spots. (C) I'm afraid we don't have any left. 4. –Would you show me some Jasmine tea, please? (D) This way, please. 5. – What a nice stereo! (A) Yes. It’s on sale today. 6. – Hello, what can I do for you? (C) I want to buy a woolen carpet. 7. –We like this chair, but we’re wond ering if you can give us some discount. (C) We only sell at the fixed price. 8. –This fits you well. (D) Ok, I’ll take it. 9. –Do you accept credit card or check? (B) Both will do. 10. –Do you like this one? It’s on sale. (B) No, not very much 11. According to the time table, the plane for Tokyo _______ at 9 in the morning. [本题1分] (A) leaves 12. When I arrived in London, it _______ [本题1分] (C) was raining 13. Don’t talk so loudly. The baby ______ [本题1分] (B) is sleeping 14. The teacher said that the moon _______ round the earth. [本题1分] (D) moves 15. I knew I _______ her before. [本题1分] (A) had met 16. The Queen _______ on TV tomorrow morning. [本题1分] (B) is to speak 17. We ______each other again since we graduated from the college. [本题1分] (D) haven’t seen 18. He didn’t go to bed until he ______ his homework [本题1分] (B) had finished 19. The children _______ many times not to go near the lake. [本题1分] (C) have been told 20. So far we ______ the first two chapters. [本题1分] (B) have overviewed 21. What will you ______ at seven tomorrow evening? [本题1分] (A) be doing 22. I hope we _______the documents ready before you come tomorrow. [本题1分] (D) will have got

第三章平面问题的有限元法作业及答案

第三章 平面问题的有限元法作业 1. 图示一个等腰三角形单元及其节点编码情况,设μ=0,单元厚度为t 。求 1)形函数矩阵[]N ;2)应变矩阵[]B ;3)应力矩阵[]S 。 4 第1题图 第2题图 2. 如题图所示,结构为边长等于a 的正方形,已知其节点位移分别为:11(,)u v 、 22(,)u v 、33(,)u v 、44(,)u v 。试求A 、B 、C 三点的位移。其中A 为正方形形心,B 为三角形形心。 3.直角边边长为l 的三角形单元,如题图所示。试计算单元等效节点载荷列阵(单元厚度为t ,不计自重)。 第3题图 第4题图 4. 如题图所示,各单元均为直角边边长等于l 的直角三角形。试计算(1)单元等效节点载荷列阵;(2)整体等效节点载荷列阵。已知单元厚度为t ,不计自重。

5.下列3个有限元模型网格,哪种节点编号更合理?为什么? 9 34 6 7912 11 34 6 12142 (a) (b) (c) 第5题图 6.将图示结构画出有限元模型;标出单元号和节点号;给出位移边界条件;并计算半带宽(结构厚度为t )。 2a (a) (b) 无限长圆筒 (c) 第6题图 7. 结构如图所示,已知结构材料常数E 和 ,单元厚度为t 。利用结构的对称性,采用一个单元,分别计算节点位移和单元应力。 第7题图

答案: 1. 1)形函数 i x N a = , j y N a = , 1m x y N a a =-- 2)应变矩阵 []1000101 000101011011B a -????=-??--???? 3)应力矩阵 []100010100 01 0111 110022 2 2S a ? ???-? ?=-????- -? ?? ? 2. A 点的位移为 ()2312A u u u = + , ()231 2A v v v =+ B 点的位移为 ()24313B u u u u = ++ , ()2431 3B v v v v =++ C 点的位移为 ()1223C a u u u = + , ()C 1223 a v v v =+ 3. 单元等效节点载荷列阵为 {}11 11 00003 663 T e i j i j R q q q q ?? =++?? ?? 4. (2)整体等效节点载荷向量为 {}111100006 322T R qlt P qlt P P qlt qlt ?? =-???? 7. (1) 减缩后的整体刚度方程 22 12 2 1222 22221110222021102(1)2 2102x x b b ab R b ab b P v Et ab a b ab ab R v b a μμμ μμμμμμ---??- - ??????????--?????? -??? ?=????---+ +? ???? ?????????-????+?? ? ? 节点位移

相关文档