PDF《机构学原理》

重点度提示1Short Answer and Calculated Question 问答及计算机构学原理 1.

问答及计算应著重於自由度及运动链之分析. 2. 选择及填充应著重於: 机构原理各名词,如机件、机构、滚动接触、滑动接触、高对、低对 ……等之定义及特性. 自由度及运动链之计算. 1. 判别下列对偶之自由度是多少? 图(a) 图(b) 图(c) 【解析】 图(a)在x轴方向有相对平移运动,故其自由度为 1. 图(b)在x轴方向有相对平移与旋转运动,故其自由度为 2. 图(c)在x轴与 y 轴方向有相对平移与摇摆(旋转)运动及 z 轴方向有相对 旋转运动,故其自由度为 5. x y z x y z z x y 图(a) 图(b) 图(c) 机械原理概要(含机械常识)抢分题库2Question Box Short Answer and Calculated Question 问答及计算Short Answer and Calculated Question 问答及计算2. 试判断下图之连杆组各为何种运动链? 图1图2【解析】 图1:N = 7,P = 8,

3 2 N

2 =

3 2 *7

2 = 8.5 ∵P<

3 2 N

2 故此连杆组为无拘束运动链. 图2:N = 6,P = 7,

3 2 N

2 =

3 2 *6

2 =

7 ∵P =

3 2 N

2 故此连杆组为拘束链.

1 2

3 4

5 6

7 (1) (2) (3) (4) (5) (6) (7) (8) (3)(4) (2) (1) (7) (5) (6)

2 3

6 5

1 4 图1图23. 试判断下图之连杆组各为何种运动链? 图1图21机构学原理3Chapter Short Answer and Calculated Question 问答及计算【解析】 图1:N = 7,P = 8,

3 2 N

2 =

3 2 *7

2 = 8.5 ∵P<

3 2 N

2 故此连杆组为无拘束运动链. 图2:N = 6,P = 7,

3 2 N

2 =

3 2 *6

2 =

7 ∵P =

3 2 N

2 故此连杆组为拘束链.

1 2

3 4

5 6

7 1 (1) (2) (3)(4) (5) (6) (7) (8) (3) (4) (2) (1) (7) (5) (6)

2 2

3 6

5 4

1 图1图24. 试判断下图之连杆组各为何种运动链? 图1图2【解析】 图1:N = 5,P = 6,

3 2 N

2 =

3 2 *5

2 = 5.5 ∵P >

3 2 N

2 故此连杆组为固定链. 图2:N = 8,P = 10,

3 2 N

2 =

3 2 *8

2 =

10 ∵P =

3 2 N

2 故此连杆组为拘束运动链. 机械原理概要(含机械常识)抢分题库4Question Box Short Answer and Calculated Question 问答及计算(2) (1) (3) (4) (5)

1 2

3 4

5 7 (8) (3) (4) (2) (1) (7) (5) (6)

3 6

5 4

1 1

1 2 (9) (10)

8 图1图25. 试判断下图之连杆组各为何种运动链? 图1图2【解析】 图1:N = 6,P = 7,

3 2 N

2 =

3 2 *6

2 =

7 ∵P =

3 2 N

2 故此连杆组为拘束运动链. 图2:N = 6,P = 7,

3 2 N

2 =

3 2 *6

2 =

7 ∵P =

3 2 N

2 故此连杆组为拘束运动链. (2) (1) (3) (4)

1 2

3 4

5 (3) (4) (2) (1) (7) (5) (6)

3 6

5 4

1 2

6 (6) (7) (5)

1 图1图21机构学原理5Chapter Short Answer and Calculated Question 问答及计算Short Answer and Calculated Question 问答及计算6. 试判断下图之连杆组各为何种运动链? 图1图2【解析】 图1:N = 5,P = 6,

3 2 N

2 =

3 2 *5

2 = 5.5 ∵P >

3 2 N

2 故此连杆组为固定链. 图2:N = 6,P = 7,

3 2 N

2 =

3 2 *6

2 =

7 ∵P =

3 2 N

2 故此连杆组为拘束运动链. (2) (1) (3) (4) (5)

1 2

3 4

5 (6)

1 1 (3) (4) (2) (1) (7) (5) (6)

3 6

5 4

1 1

1 2 图1图27. 试求下图机构之自由度? 图1图2