. .
: 1, 2, 3.
, (.5.1. 5.3.). i Fi= γoi. .
5.1. 1
5.2. 2
5.3. 3
k = / , (5.1)
, .
C Fi :
Ni=FiCosαi Qi=FiSinαi, (5.2)
αi , .
:
N1=(F1 + G)Cosα1 Q1=(F1 + G) Sinα1. (5.3)
Qi , . , :
i = Nitgφo + coli, (5.4)
li i- .
,
= r (Q3 + Q4 + Q5 + ΣTi) (5.5)
= Eala + r (Q1 + Q2) (5.6)
la (.5.1-5.3).
:
kmin ≥ γn /m, (5.7)
kmin = min( /) (5.8)
, , z, γn, m , .
1:
= 0,5*6,2 + 0,5*1,994*6,2 + 0,5*0,445*1,5 = 10,630 2;
1 = 2,656 2, α1 = 39̊; F1 = 2,656*18,6 + 10,313*23 = 286,6 ; l1 = 3,3 ;
2 = 9,881 2, α2 = 12̊; F2 = 9,881*18,6 = 183,786 ; l2 = 2,64 ;
3 = 9,881 2, α3 = 12̊; F3 = 9,881*18,6 = 183,786 ; l3 = 2,64 ;
4 = 6,256 2, α4 = 39̊; F4 = 6,256*18,6 = 116,361 ; l4 = 3,3 ;
5 = 0,620 2, α5 = 61̊; F5 = 0,620*18,6 = 11,532 ; l5 = 1,71 ;
N1=286,6*Cos39 = 222,73 Q1=286,6*Sin39=180,363 ;
N2=183,786*Cos12 = 179,77 Q2=183,786*Sin12 = 38,211 ;
N3=183,786*Cos12 = 179,77 Q3=183,786*Sin12 = 38,211 ;
N4=116,361*Cos39 = 90,429 Q4=116,361*Sin39= 73,228 ;
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N5=11,532*Cos61 = 5,391 Q5=11,532*Sin61= 10,086 ;
1 = 222,73*tg28 + 20*3,3 = 184,428 ;
2 = 179,77*tg28 + 20*2,64 = 148,385 ;
3 = 179,77*tg28 + 20*2,64 = 148,385 ;
4 = 116,361*tg28 + 20*3,3 = 127,87 ;
5 = 5,391*tg28 + 20*1,71 = 37,066 .
=r(Q3+Q4+Q5+ΣTi)=6,42(38,211+73,228+10,086+184,428+2*148,385+127,87+37,066)= 4928,37 *
= Eala + r (Q1 + Q2) =102,665*1,652+6,42(180,363+38,211)=1572,848 *
k1 = / =4928,37/1572,848 = 3,133.
2:
1 = 1,819 2, α1 = 29̊; F1 = 1,819*18,6 + 10,313*23 = 271,032 ; l1 = 2,94 ;
2 = 8,057 2, α2 = 9̊; F2 = 8,057*18,6 = 149,86 ; l2 = 2,61 ;
3 = 8,057 2, α3 = 9̊; F3 = 8,057*18,6 = 149,86 ; l3 = 2,61 ;
4 = 5,732 2, α4 = 29̊; F4 = 5,732*18,6 = 106,615 ; l4 = 2,94 ;
5 = 1,117 2, α5 = 40̊; F5 = 1,117*18,6 = 20,776 ; l5 = 2,11 ;
N1=271,032*Cos29 = 237,05 Q1=271,032*Sin29=131,4 ;
N2=149,86*Cos12 = 143,651 Q2=149,86*Sin12 = 30,534 ;
N3=149,86*Cos12 = 143,651 Q3=149,86*Sin12 = 30,534 ;
N4=106,615 *Cos29 = 93,248 Q4=106,615 *Sin29= 51,688 ;
N5=20,776*Cos40 = 15,915 Q5=20,776*Sin40= 13,355 ;
1 = 237,05*tg28 + 20*2,94 = 184,842 ;
2 = 143,651*tg28 + 20*2,61 = 128, 581 ;
3 = 143,651*tg28 + 20*2,61 = 128, 581 ; ΣTi = 601,048
4 = 93,248*tg28 + 20*2,94 = 108,381 ;
5 = 15,915*tg28 + 20*2,11 = 50,663 .
=r(Q3+Q4+Q5+ΣTi)=8,23(30,534+51,688+13,355+601,048)= 5733,224 *
= Eala + r (Q1 + Q2) =102,665*4,232 +8,23(131,4+30,534)=1544,985 *
k2 = / =5733,224/1544,985= 3,711.
3:
1 = 1,355 2, α1 = 22̊; F1 = 1,355*18,6 + 10,313*23 = 262,402 ; l1 = 2,79 ;
2 = 7,002 2, α2 = 7̊; F2 = 7,002*18,6 = 130,237 ; l2 = 2,6 ;
3 = 7,002 2, α3 = 7̊; F3 = 7,002*18,6 = 130,237 ; l3 = 2,6 ;
4 = 5,227 2, α4 = 22̊; F4 = 5,227*18,6 = 97,222 ; l4 = 2,79 ;
5 = 1,501 2, α5 = 37̊; F5 = 1,501*18,6 = 27,919 ; l5 = 2,5 ;
N1=262,402*Cos22 = 243,295 Q1=262,402*Sin22 = 98,298 ;
N2=130,237*Cos7 = 129,266 Q2=130,237*Sin7 = 15,872 ;
N3=130,237*Cos7 = 129,266 Q3=130,237*Sin7 = 15,872 ;
N4=97,222*Cos22 = 90,142 Q4=97,222*Sin22= 36,42 ;
N5=27,919*Cos37 = 22,297 Q5=27,919*Sin37= 16,802 ;
1 = 243,295*tg28 + 20*2,79 = 185,162 ;
2 = 129,266*tg28 + 20*2,6 = 120,732 ;
3 = 129,266*tg28 + 20*2,6 = 120,732 ; ΣTi = 592,211
4 = 90,142*tg28 + 20*2,79 = 103,729 ;
5 = 22,297*tg28 + 20*2,5 = 61,856 .
=r(Q3+Q4+Q5+ΣTi)=10,36(15,872+36,42+16,802+592,211)= 6851,12 *
= Eala + r (Q1 + Q2) =102,665*6,812 +10,36(98,298+15,872)=1882,155 *
k3 = / =6851,12/1882,155 = 3,64.
k1 = 3,133; k2 = 3,711; k3 = 3,64.
γn/m =1,1/0,8 = 1,375;
kmin ≥ γn/m;
kmin = k1 = 3,133;
3,133 ≥ 1,375.
: . .