页码21页码37页码42.PDF
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1-2 1
6. 8 99
N P
2-37
18.6 99
19.
99
20.
99
3-42
( ) α
14. D
L
(A) πD secα (B) πD tanα
(C) 2L (D) 0.5L 98
D
b G B
12
11
L 109 8 76 f β L
4 5 e
2 3
1 α
a C
12 6 A 1 2 3 4 5 6 7 8 9 10 11 12
1 πD
11
5
2 4
10 3 8 7
9
3-44
27. 3 40% 90
等
kg 97
*
M M η
*
M η -
= M = 3 (1 40%) = 1.8
3-44
P D θ
29. 99
M -
30. 30 3 45 1 mm 99
M 30 30mm 3 3mm 45
45mm 1 1
31.4 40% 900N
N 99
*
M M η -
= = 4 (1 0.4) = 2.4
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