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中国大学moocfundamentals of mechanical design慕课答案大全-k8凯发

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k8凯发-凯发官网入口资讯答案 正文

作者2022-12-05 20:48:01资讯答案 78 ℃0 评论
chapter 1--introduction

chapter 1--introduction--homework

1、select a mechanical component from part 3 of this book (roller bearings, springs, etc.), go to the internet, and, using a search engine, report on the information obtained on five manufacturers or suppliers.

chapter 2---kinematics fundamentals

chapter 2---homework

1、please see the attached.

chapter 3--linkages

chapter 3--homework

1、please see the attached.

chapter 4---failure and prevention

chapter4---bearing failure-homework

1、review design equations (stress calculation) on mechanics of materials.

chapter5---shaft

chapter 5-shaft--homework

1、please check the attached.

chapter 6 bearing

chapter 6--bearing--homework

1、please see the attached ducument (ppt version)

chapter 7--gears

chapter 7---gears--homework

1、please check the attached documents.

chapter 8--cam

chapter 8--cam--homework

1、please see the attached document

chapter 9--joint

chpater 9--homework

1、please check the attached document

chapter 10--belt and chain

chapter 10--belt and chain--homework

1、please compare belt drive, chain drive and gear drvie.

final exam

fundamentals of mechanical design--final exam 1

1、the sewing machine is . a.double-rocker mechanism b.double crank mechanism c.crank-rocker mechanism
    a、a
    b、b
    c、c
    d、d

2、the life of ball rolling bearing is fl = constant,, for roller bearings, α= . a.1 b.3 c.1/3 d.10/3
    a、a
    b、b
    c、c
    d、d

3、a pair of spur gear,the surface durability stress of driver gear and driven gear are sh1 and sh2, the surface durability stress . a.sh1 > sh2 b.sh1 < sh2 c.sh1 = sh2
    a、a
    b、b
    c、c
    d、d

4、is an inherent physical phenomenon in belt transmission, and it is inevitable. a. creep b. slip c. loose d. fatigue
    a、a
    b、b
    c、c
    d、d

5、the condition of continuous transmission of a pair of involute gears is that contact ratio ε should be . a. ε≥1 b. ε≥2 c. ε≤1 d. ε≥1.3
    a、a
    b、b
    c、c
    d、d

6、in belt drive, the tension stress of the belt is as follows . a. invariant b. regularly changing c. irregular d. equal to zero
    a、a
    b、b
    c、c
    d、d

7、condition of self-lock for screw is . a. lead angle ≤ equivalent frication angle b. lead angle ≤ frication angle c. lead angle ≥ frication angle d. lead angle ≥ equivalent frication angle
    a、a
    b、b
    c、c
    d、d

8、the pressure angle at locked point for four-link mechanism is . a. 0 b. 90° c. 0~45° d. 45°~90°
    a、a
    b、b
    c、c
    d、d

9、pressure angle at each point of involute curve is . a.= b.≠ c.≠ 0 d.= 0
    a、a
    b、b
    c、c
    d、d

10、pressure angle at the base circle is . a.= b.≠ c.≠ 0 d.= 0
    a、a
    b、b
    c、c
    d、d

11、a pair of spur gear,z1=18, z2=72, lewis bending stress . a. b. c. d. uncertain
    a、a
    b、b
    c、c
    d、d

12、the place of the maximum stress of belt is . a. small pulley--slack side b. small pulley--tight side c. big pulley--slack side d. big pulley--tight side
    a、a
    b、b
    c、c
    d、d

13、the considerations of design have . a .cost b. reliability c. quality d. cover a.b and c
    a、a
    b、b
    c、c
    d、d

14、the meshing conditions of gears are . a. modules are same b. pressure angles are same c.both modules and pressure angles are same d. numbers of teeth are same
    a、a
    b、b
    c、c
    d、d

15、for a single bearing, the probability of reaching or exceeding its expected life is only . a.70% b. 80% c. 90% d. 100%
    a、a
    b、b
    c、c
    d、d

16、the design is an innovative and highly iterative process.

17、the gear train can change speed and direction.

18、the tension pulley of v-belt should be placed in the inner of the slack side and close to the small pulley as far as possible.

19、when the belt drive works normally, the accurate transmission ratio can not be guaranteed because the belt is easy to slip on the pulley.

20、the internal and external threads used together have the same helix.

fundamentals of mechanical design--final exam 2

1、please see the attahced document which contains 6 questions.

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