机械原理课程设计 偏置直动滚子推杆盘形凸轮.docx
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机械原理课程设计偏置直动滚子推杆盘形凸轮
凸轮大作业
选题:
凸轮5-C
一:
题目及原始数据:
利用计算机辅助设计完成偏置直动滚子推杆盘形凸轮机构的设计,已知数据如下所示,凸轮沿逆时针方向做匀速运动。
具体要求如下:
1.推程运动规律为等加速等减速运动,回程运动规律为五次多项式运动;
2.近休凸轮转角为0°-30°;推程凸轮转角30°-210°;远休凸轮转角210°-280°;回程凸轮转角280°-360。
°
3.初选基圆半径为22mm;
4.偏距为+14mm
5.滚子半径为18mm
6.推杆行程为35mm
7.许用压力角为α1=35°,α2=65°。
8.最小曲率半径为0.35rr
9.计算点数取120.
二:
推杆运动规律及凸轮轮廓线方程
1.推程加速阶段:
s1=70.*a1.*a1/pi/pi;
x1=(s0+s1).*sin(a1)+e*cos(a1);
y1=(s0+s1).*cos(a1)-e*sin(a1);
k1=140*a1/pi^2;
i1=[(k1-e).*sin(a1)+(s0+s1).*cos(a1)].*[(k1-e).*(k1-e)+(s0+s1).*(s0+s1)].^(-1/2);
j1=[-(k1-e).*cos(a1)+(s0+s1).*sin(a1)].*[(k1-e).*(k1-e)+(s0+s1).*(s0+s1)].^(-1/2);
x10=x1-18*j1;
y10=y1-18*i1;
2.推程减速阶段:
s11=35-70.*(pi-a11).*(pi-a11)/pi/pi;
x11=(s0+s11).*sin(a11)+e*cos(a11);
y11=(s0+s11).*cos(a11)-e*sin(a11);
k11=140.*(pi-a1)/pi^2;
i11=[(k11-e).*sin(a11)+(s0+s11).*cos(a11)].*[(k11-e).*(k11-e)+(s0+s11).*(s0+s11)].^(-1/2);
j11=[-(k11-e).*cos(a11)+(s0+s11).*sin(a11)].*[(k11-e).*(k11-e)+(s0+s11).*(s0+s11)].^(-1/2);
x101=x11-18*j11;
y101=y11-18*i11;
3.远休阶段:
x2=(s0+s2).*sin(a2)+e*cos(a2);
y2=(s0+s2).*cos(a2)-e*sin(a2);
k2=0;
i2=[(k2-e).*sin(a2)+(s0+s2).*cos(a2)].*[(k2-e).*(k2-e)+(s0+s2).*(s0+s2)].^(-1/2);
j2=[-(k2-e).*cos(a2)+(s0+s2).*sin(a2)].*[(k2-e).*(k2-e)+(s0+s2).*(s0+s2)].^(-1/2);
x20=x2-18*j2;
y20=y2-18*i2;
4.回程阶段:
a30=33*pi/18-a3;
s3=(350.*a30.*a30.*a30/(4*pi/9)^3-525.*a30.*a30.*a30.*a30/(4*pi/9)^4+210.*a30.*a30.*a30.*a30.*a30/(4*pi/9)^5);
x3=(s0+s3).*sin(a3)+e*cos(a3);
y3=(s0+s3).*cos(a3)-e*sin(a3);
k3=-1050.*a30.*a30/(4*pi/9)^3+2100.*a30.*a30.*a30/(4*pi/9)^4-1050.*a30.*a30.*a30.*a30/(4*pi/9)^5;
i3=[(k3-e).*sin(a3)+(s0+s3).*cos(a3)].*[(k3-e).*(k3-e)+(s0+s3).*(s0+s3)].^(-1/2);
j3=[-(k3-e).*cos(a3)+(s0+s3).*sin(a3)].*[(k3-e).*(k3-e)+(s0+s3).*(s0+s3)].^(-1/2);
x30=x3-18*j3;
y30=y3-18*i3;
5.近休阶段:
s4=0;
x4=(s0+s4).*sin(a4)+e*cos(a4);
y4=(s0+s4).*cos(a4)-e*sin(a4);
k4=0;
i4=[(k4-e).*sin(a4)+(s0+s4).*cos(a4)].*[(k4-e).*(k4-e)+(s0+s4).*(s0+s4)].^(-1/2);
j4=[-(k4-e).*cos(a4)+(s0+s4).*sin(a4)].*[(k4-e).*(k4-e)+(s0+s4).*(s0+s4)].^(-1/2);
x40=x4-18*j4;
y40=y4-18*i4;
三:
matlab计算程序
e=14;
r0=22
s0=sqrt(r0^2-e^2);
c111=1;
c3=1;
for(i=1:
0.1:
200)%由压力角条件循环求合适基圆半径
if(c111<35/180)&&(c3<65/180)%判断条件
elsea1=0:
pi/60:
pi/2;%推程加速阶段
s1=70.*a1.*a1/pi/pi;
x1=(s0+s1).*sin(a1)+e*cos(a1);
y1=(s0+s1).*cos(a1)-e*sin(a1);
k1=140*a1/pi^2;%对s1求导
i1=[(k1-e).*sin(a1)+(s0+s1).*cos(a1)].*[(k1-e).*(k1-e)+(s0+s1).*(s0+s1)].^(-1/2);
j1=[-(k1-e).*cos(a1)+(s0+s1).*sin(a1)].*[(k1-e).*(k1-e)+(s0+s1).*(s0+s1)].^(-1/2);
x10=x1-18*j1;
y10=y1-18*i1;
a11=pi/2:
pi/60:
pi;%推程减速阶段
s11=35-70.*(pi-a11).*(pi-a11)/pi/pi;
x11=(s0+s11).*sin(a11)+e*cos(a11);
y11=(s0+s11).*cos(a11)-e*sin(a11);
k11=140.*(pi-a1)/pi^2;
i11=[(k11-e).*sin(a11)+(s0+s11).*cos(a11)].*[(k11-e).*(k11-e)+(s0+s11).*(s0+s11)].^(-1/2);
j11=[-(k11-e).*cos(a11)+(s0+s11).*sin(a11)].*[(k11-e).*(k11-e)+(s0+s11).*(s0+s11)].^(-1/2);
x101=x11-18*j11;
y101=y11-18*i11;
a2=pi:
pi/60:
25*pi/18;%凸轮远休阶段s2=35;%推杆行程
x2=(s0+s2).*sin(a2)+e*cos(a2);
y2=(s0+s2).*cos(a2)-e*sin(a2);
k2=0;
i2=[(k2-e).*sin(a2)+(s0+s2).*cos(a2)].*[(k2-e).*(k2-e)+(s0+s2).*(s0+s2)].^(-1/2);
j2=[-(k2-e).*cos(a2)+(s0+s2).*sin(a2)].*[(k2-e).*(k2-e)+(s0+s2).*(s0+s2)].^(-1/2);
x20=x2-18*j2;
y20=y2-18*i2;
a3=25*pi/18:
pi/60:
33*pi/18;%推杆回程阶段
a30=33*pi/18-a3;
s3=(350.*a30.*a30.*a30/(4*pi/9)^3-525.*a30.*a30.*a30.*a30/(4*pi/9)^4+210.*a30.*a30.*a30.*a30.*a30/(4*pi/9)^5);
x3=(s0+s3).*sin(a3)+e*cos(a3);
y3=(s0+s3).*cos(a3)-e*sin(a3);
k3=-1050.*a30.*a30/(4*pi/9)^3+2100.*a30.*a30.*a30/(4*pi/9)^4-1050.*a30.*a30.*a30.*a30/(4*pi/9)^5;
i3=[(k3-e).*sin(a3)+(s0+s3).*cos(a3)].*[(k3-e).*(k3-e)+(s0+s3).*(s0+s3)].^(-1/2);
j3=[-(k3-e).*cos(a3)+(s0+s3).*sin(a3)].*[(k3-e).*(k3-e)+(s0+s3).*(s0+s3)].^(-1/2);
x30=x3-18*j3;
y30=y3-18*i3;
a4=33*pi/18:
pi/60:
2*pi;%推杆近休阶段
s4=0;
x4=(s0+s4).*sin(a4)+e*cos(a4);
y4=(s0+s4).*cos(a4)-e*sin(a4);
k4=0;
i4=[(k4-e).*sin(a4)+(s0+s4).*cos(a4)].*[(k4-e).*(k4-e)+(s0+s4).*(s0+s4)].^(-1/2);
j4=[-(k4-e).*cos(a4)+(s0+s4).*sin(a4)].*[(k4-e).*(k4-e)+(s0+s4).*(s0+s4)].^(-1/2);
x40=x4-18*j4;
y40=y4-18*i4;
plot(x10,y10,'-g*',x101,y101,'-g+',x20,y20,'-r*',x30,y30,'-b*',x40,y40,'-k*',x1,y1,'-g*',x11,y11,'-g+',x2,y2,'-r*',x3,y3,'-b*',x4,y4,'-k*')
%凸轮轮廓曲线绘制
title(‘凸轮轮廓曲线绘制');
xlabel('VariableX');%X轴
ylabel('VariableY');%Y轴
text(-250,-200,'工作廓线')%文字标注
text(100,-100,'理论廓线');
gridon%加网格
axisequal%坐标相等
a1=0:
pi/60:
pi/2;%压力角计算
force1=abs(atan((k1).*(s0+s1).^-1));
c1=max(force1);
a11=pi/2:
pi/60:
pi;
force11=abs(atan((k11).*(s0+s11).^-1));
c11=max(force11);
c111=max(c1,c11);
a2=pi:
pi/60:
25*pi/18;
force2=abs(atan((k2).*(s0+s2).^-1));
c2=max(force2);
a3=25*pi/18:
pi/60:
33*pi/18;
force3=abs(atan((k3).*(s0+s3).^-1));
c3=max(force3);
a4=33*pi/18:
pi/60:
2*pi;
force4=abs(atan((k4).*(s0+s4).^-1));
c4=max(force4);
r0=r0+1;%每循环一次基圆半径+1
s0=sqrt(r0^2-e^2);
end
end