MATLAB


- 7


Q = q 2 a = 8 kH.

- F1 , F2 .

4. ( D -

4.5a)

Fix = D

- F2 + F1 sin ? Q cos 600

+ S = 0

Fiy = YD Q sin 600 + RA - F1 cos ? = 0 ( )

miC = - F2 sin 300 a + F1cos? a + F1 sin? 2a M YD a +

+ R a cos 300 + S a + XD 2 a = 0.

XD , D , S , RA .

II. ( . 4.5b ).

1. .

2. . F2 , Q XC , C , RA .

3. ( C )

Fix = XC - F2 - Q sin 300 = 0

Fiy = RA

+ YC - Q cos 300 = 0 ( )

miC = - F2 sin 300 a + RA cos 300 a = 0

() () , () . ,

RA = F2 tg 300 = 6 tg 300 = 3,464 ͠ ,

XC = F2 + Q sin 300 = 10 ,

= Q cos 300 RA = 3,464 .

(), MATLAB

syms XD YD S al %

Q1=solve('XD-6+4*sin(al)-8*0.5+S=0','YD-8*0.866+3.464-4*cos(al)=0',...

'-6*0.5*0.4+4*0.4*cos(al)+4*2*0.4*sin(al)-5-YD*0.4+3.464*0.4*0.866+S*0.4+XD*2*0.4=0'...

,XD,YD,S); %