平面六杆机构设计说明.docx

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平面六杆机构设计说明.docx

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平面六杆机构设计说明.docx

平面六杆机构设计说明

 

机械原理大作业

 

班级:

材料124

小组数据:

3B

 

一、题目:

计算平面连杆机构的运动学分析

1,图a所示的为一平面六杆机构。

设已知各构件的尺寸如表1所示,原动件1以等角速度ω1=1rad/s沿着逆时针方向回转,试求各从动杆件的角位移、角速度和角加速度以及E点的位移、速度和加速度的变化情况。

表1     平面六杆机构的尺寸参数(单位:

mm)

L1

L2

L3

L4

L5

L6

α

 A

B

C

26.5

105.6

95

87.5

48.4

39

60°

L3=95

 

%crank_rocker222_main

clear;

l1=26.5;

l2=105.6;

l3=95;

l4=87.5;

l5=48.4;

l6=39.0;

l9=65.0;

lag=159.1;

xg=153.5;

yg=41.7;

omega1=1;

theta7=60;

alpha1=0;

hd=pi/180;du=180/pi;

m=-1;

forn1=1:

360

theta1=(n1-1)*hd;

aa=2*l1*l3*sin(theta1);

bb=2*l3*(l1*cos(theta1)-l4);

cc=l2*l2-l1*l1-l3*l3-l4*l4+2*l1*l4*cos(theta1);

theta3(n1)=2*atan((aa+m*sqrt(aa*aa+bb*bb-cc*cc))/(bb-cc));

s1=l3*sin(theta3)-l1*sin(theta1);

theta2(n1)=atan(s1/(l4+l3*cos(theta3)-l1*cos(theta1)));

xe=l1*cos(theta1)+l2*cos(theta2)+l9*cos(theta2-theta7);

ye=l1*sin(theta1)+l2*sin(theta2)+l9*sin(theta2-theta7);

s2=yg-ye;

theta8(n1)=atan(s2/(xg-xe));

s3=(xe-xg).*(xe-xg)+(ye-yg).*(ye-yg)+l5*l5-l6*l6;

theta9(n1)=acos(s3/(2*l5*sqrt((xe-xg).*(xe-xg)+(ye-yg).*(ye-yg))));

theta5(n1)=theta8(n1)-theta9(n1)+pi;

s4=ye+l5*sin(theta8-theta9)-yg;

theta6(n1)=atan(s4/(xe+l5*cos(theta8-theta9)-xg));

theta9(n1)=2*pi-(theta7-theta2(n1));

omega3(n1)=omega1*l1*sin(theta1-theta2)/l3/sin(theta3-theta2);

omega2(n1)=-omega1*l1*sin(theta1-theta3)/l2/sin(theta2-theta3);

omega5(n1)=omega2(n1)*(l2*sin(theta2(n1)-theta6(n1))+l9*sin(theta2(n1)-theta7-theta6(n1)))+omega1*l1*sin(theta1-theta6(n1))/l5/sin(theta5(n1)-theta6(n1));

omega6(n1)=-omega2(n1)*(l2*sin(theta2(n1)-theta5(n1))+l9*sin(theta2(n1)-theta7-theta5(n1)))+omega1*l1*sin(theta1-theta5(n1))/l6/sin(theta5(n1)-theta6(n1));

s4=l2*omega2(n1)*omega2(n1)+l1*omega1*omega1*cos(theta1-theta2)-l3*omega3(n1)*omega3(n1)*cos(theta3-theta2);

s5=l3*omega3(n1)*omega3(n1)-l1*omega1*omega1*cos(theta1-theta3)-l2*omega2(n1)*omega2(n1)*cos(theta2-theta3);

s6=omega1*omega1*l1*cos(theta1-theta6(n1))+omega2(n1)*omega2(n1)*(l2*cos(theta2(n1)-theta6(n1))+l9*cos(theta2(n1)-theta7-theta6(n1)))-l5*omega5(n1)*omega5(n1)*cos(theta5(n1)-theta6(n1))-l6*omega6(n1)*omega6(n1);

s7=omega1*omega1*l1*cos(theta1-theta5(n1))+omega2(n1)*omega2(n1)*(l2*cos(theta2(n1)-theta5(n1))+l9*cos(theta2(n1)-theta7-theta5(n1)))-l5*omega5(n1)*omega5(n1)-l6*omega6(n1)*omega6(n1)*cos(theta6(n1)-theta5(n1));

alpha3(n1)=s4/(l3*sin(theta3-theta2));

alpha2(n1)=s5/(l2*sin(theta2-theta3));

alpha5(n1)=(s6+alpha2(n1)*(l2*sin(theta2(n1)-theta6(n1))+l9*sin(theta2(n1)-theta7-theta6(n1))))/l5/sin(theta5(n1)-theta6(n1));

alpha6(n1)=-(s7+alpha2(n1)*(l2*sin(theta2(n1)-theta5(n1))+l9*sin(theta2(n1)-theta7-theta5(n1))))/l6/sin(theta5(n1)-theta6(n1));

vex=-l1*omega1.*sin(theta1)-l2*omega2.*sin(theta2)-l9*omega2.*sin(theta2-theta7);

vey=l1*omega1.*cos(theta1)+l2*omega2.*cos(theta2)+l9*omega2.*cos(theta2-theta7);

ve=sqrt(vex.*vex+vey.*vey);

aex=-l1*alpha1.*sin(theta1)-l1*omega1.*omega1.*cos(theta1)-l2*omega2.*omega2.*cos(theta2)-l2*alpha2.*sin(theta2)-l9*alpha2.*sin(theta2-theta7)-l9*omega2.*omega2.*cos(theta2-theta7);

aey=l1*alpha1.*cos(theta1)-l1*omega1.*omega1.*sin(theta1)+l2*alpha2.*cos(theta2)-l2*omega2.*omega2.*sin(theta2)+l9*alpha2.*cos(theta2-theta7)-l9*omega2.*omega2.*sin(theta2-theta7);

ae=sqrt(aex.*aex+aey.*aey);

end

figure

(1);

n1=1:

360;

 

subplot(2,3,1);

plot(n1,real(theta2*du),n1,real(theta3*du),n1,real(theta5*du),n1,real(theta6*du),'k');

title('角位移线图');

xlabel('曲柄转角\phi_1/\circ')

ylabel('角位移/\circ')

gridon;

holdon;

text(100,100,'\phi_3')

text(100,40,'\phi_2')

text(100,175,'\phi_5')

text(100,0,'\phi_6')

 

subplot(2,3,2);

plot(n1,real(omega2),n1,real(omega3),'k');

title('角速度23线图');

xlabel('曲柄转角\phi_1/\circ')

ylabel('角速度/rad\cdots^{-1}')

gridon;holdon;

text(100,0.1,'\omega_2')

text(100,0.35,'\omega_3')

 

subplot(2,3,3);

plot(n1,real(omega5),n1,real(omega6),'k');

title('角速度56线图');

xlabel('曲柄转角\phi_1/\circ')

ylabel('角速度/rad\cdots^{-1}')

gridon;holdon;

text(200,14,'\omega_5')

text(200,25,'\omega_6')

subplot(2,3,4);

plot(n1,real(alpha2),n1,real(alpha3),'k');

title('角加速度23线图');

xlabel('曲柄转角\phi_1/\circ')

ylabel('角加速度/rad\cdots^{-2}')

gridon;

holdon;

text(200,0,'\alpha_2')

text(200,-0.2,'\alpha_3')

subplot(2,3,5);

plot(n1,real(alpha5),n1,real(alpha6),'k');

title('角加速度56线图');

xlabel('曲柄转角\phi_1/\circ')

ylabel('角加速度/rad\cdots^{-2}')

gridon;

holdon;

text(200,-200,'\alpha_5')

text(200,-450,'\alpha_6')

subplot(2,3,6);

plot(n1,real(ve),n1,real(ae),'k');

title('e点的速度和加速度线图');

xlabel('曲柄转角\phi_1/\circ')

ylabel('速度/m*s^{-1}')

gridon;holdon;

text(80,25,'ve')

text(65,45,'ae')

 

figure

(2)

m=moviein(20);

j=0;

forn1=1:

5:

360;

j=j+1;

clf;

x

(1)=0;

y

(1)=0;

x

(2)=l1*cos((n1-1)*hd);

y

(2)=l1*sin((n1-1)*hd);

x(3)=l4+l3*cos(theta3(n1));

y(3)=l3*sin(theta3(n1));

x(4)=l4;

y(4)=0;

x(5)=l4+l3*cos(theta3(n1));

y(5)=l3*sin(theta3(n1));

x(6)=l4+l3*cos(theta3(n1))+l2-cos(theta2(n1)-theta7);

y(6)=l3*sin(theta3(n1))+l2*sin(theta2(n1)-theta7);

x(7)=xg+l6*cos(theta6(n1));

y(7)=yg+l6*sin(theta6(n1));

x(8)=xg;

y(8)=yg;

plot(real(x),real(y));

gridon;

holdon;

plot(x

(1),y

(1),'o');

plot(x

(2),y

(2),'o');

plot(x(3),y(3),'o');

plot(x(4),y(4),'o');

plot(x(5),y(5),'o');

plot(real(x(6)),real(y(6)),'o');

plot(real(x(7)),real(y(7)),'o');

plot(real(x(8)),real(y(8)),'o');

axis([-150350-150200]);

title('平面六连杆机构');

xlabel('mm')

ylabel('mm')

m(j)=getframe;

end

movie(m);

 

杆2杆3杆5杆6的角位移线图

杆2杆3的角速度

 

杆5杆6的角速度线图

杆2杆3的角加速度线图

杆5杆6的角加速线图

 

E点的速度加速度线图

机构动画简图

 

总体线图

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