решения курсовых (семестровых) работ из задачника / Динамика / d15_13
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: P1 = 9 , P2 = 5 , |
q =1 , M = 6 H × . |
.1
Q = q × 4 = 1× 4 = 4 , .
, ! ,
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( .1). |
RC , C |
C |
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" #
δϕ , ;
. $ , , !
,
: Q × 2δϕ - 4δϕ = 0,
= 0.5Q = 0.5 × 4 = 2 .
" # 1 P1x = P1 cos 60 P1 y = - P1 sin 60 .
B, ! ,
RB ,
RBx = - RB cos 45 RB = RB sin 45 ( .1).
" #
δϕ , ;
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$ , , !
,
:
P1 cos 60 × 2δϕ - P1 sin 60 × 3δϕ - P2 ×1δϕ - M ×δϕ - RB cos 45 × 4δϕ + RB sin 45 × 6δϕ = 0,
RB = |
- P1 cos 60 × 2 + P1 sin 60 × 3 + P2 ×1 + M |
= |
-9 × 0.5 × 2 + 9 × 0.5 |
3 |
× 3 + 5 ×1 + 6 |
» 17.948 . |
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6 sin 45 - 4 cos 45 |
6 × 0.5 |
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- 4 × 0.5 |
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2 |
2 |
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" ;
, :
X Cδ s - P1 cos 60 δ s - P2δ s - RB cos 45 δ s = 0,
X C = P1 cos 60 + P2 + RB cos 45 = 9 × 0.5 + 5 + 17.948 × 0.5
2 » 22.191 . $
RC = 
X C2 + C2 = 
22.1912 + 22 » 22.281 .
, ! ,
R ( .1).
" ;
, :
C δ s - Qδ s - P1 sin 60 δ s - RAδ s + RB sin 45 δ s = 0,
RA = C - Q - P1 sin 60 + RB sin 45 = 2 - 4 - 9 × 0.5 |
3 |
+ 17.948 × 0.5 |
2 |
» 2.897 . |
: RA = 2.897 , R = 17.948 , = 22.191 , = 2 , |
R = 22.281 . |
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