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1、word机械原理大作业二课程名称： 机械原理 设计题目： 凸轮机构设计 一设计题目设计直动从动件盘形凸轮机构，凸轮机构原始参数序号升程(mm)升程运动角()升程运动规律升程许用压力角回程运动角回程运动规律回程许用压力角远休止角近休止角2212090等加等减速4080等减等加速7070120二 凸轮推杆运动规律1.运动规律等加速等减速运动 推程 推程 2.运动规律等加速等减速运动 回程 回程 三推杆位移、速度、加速度线图与凸轮线图采用VB编程，其源程序与图像如下：1.位移：Private Sub mand1_Click()Timer1.Enabled = True 开启计时器End SubPri
2、vate Sub Timer1_Timer()Static i As SingleDim s As Single, q As Single i作为静态变量，控制流程；s代表位移；q代表角度 Picture1.CurrentX = 0 Picture1.CurrentY = 0 If i = 45 And i = 90 And i = 150 And i = 190 And i = 230 And i = 360 Then q = i s = 0 Picture1.PSet Step(q, -s), vbBlack Else End IfEnd SubPrivate Sub mand2_Clic
3、k()Timer2.Enabled = True 开启计时器End SubPrivate Sub Timer2_Timer()Static i As SingleDim v As Single, q As Single, w As Single i为静态变量，控制流程；q代表角度；w代表角速度，此处被赋予50Picture1.CurrentX = 0 Picture1.CurrentY = 0w = 50 If i = 45 And i = 90 And i = 150 And i = 190 And i = 230 And i = 360 Then q = i v = 0 Picture1.
4、PSet Step(q, -v), vbBlackElse End IfEnd SubPrivate Sub mand3_Click()Timer3.Enabled = True 开启计时器End SubPrivate Sub Timer3_Timer()Static i As SingleDim a As Single, w As Single, q As Single i为静态变量，控制流程；a代表加速度；q代表角度；w代表角速度w = 50 Picture1.CurrentX = 0 Picture1.CurrentY = 0 If i = 45 And i = 90 And i = 1
5、50 And i = 190 And i = 230 And i = 360 Then q = i a = 0 Picture1.PSet Step(q, -a), vbBlack Else End IfEnd SubPrivate Sub mand4_Click()Timer4.Enabled = True 开启计时器；建立坐标系Picture1.Scale (-400, -400)-(400, 400)End SubPrivate Sub Timer4_Timer()Static i As SingleDim x As Single, s As Single, q As Single, s
6、caley As Single, t As Single i为静态变量，控制流程；x代表位移；s代表纵坐标ds/dq；q代表角度Picture1.CurrentX = 0Picture1.CurrentY = 0scaley = 1t = 3.14 / 180 If i = 45 And i = 90 And i = 150 And i = 190 And i = 230 And i = 360 Then q = i * t x = 0 s = 0 Picture1.PSet Step(x, -s), vbRed Else End IfEnd Sub四确定凸轮基圆半径和偏距1. 求切点转角在图
7、中，右侧曲线为升程阶段的类速度-位移图，作直线Dtdt与其相切，且位移轴正方向呈夹角1=300,如此切点处的斜率与直线Dtdt的斜率相等，因为kDtdt=tan600,右侧曲线斜率可以表示为：q;q=tan600继而求出切点坐标337.272,292.084。同理可求出另一切点-89.766,16.347y-292.084=1.732*x-337.272y-16.347=-0.364*x+89.766程序如下：Private Sub mand5_Click() 开启计时器；画出ds/dq-s图的切线Timer5.Enabled = True Picture1.Scale (-400, -400
8、)-(400, 400) Picture1.Line (-50, 378.671)-(200, -54.329), vbRed Picture1.Line (-200, -65.683)-(40, -481.363), vbBlue Picture1.Line (-200, -209.127)-(200, -63.527), vbBlack Picture1.Line (-200, -56.472)-(200, 89.128), vbGreenEnd SubPrivate Sub Timer5_Timer() i为静态变量，控制流程；x代表位移；s代表纵坐标ds/dq；q代表角度；scaley
9、是图形比例系数；t为角度，弧度转化系数Static i As SingleDim x As Single, s As Single, q As Single, scaley As Single, t As SinglePicture1.CurrentX = 0Picture1.CurrentY = 0scaley = 1t = 3.14 / 180 If i = 45 And i = 90 And i = 150 And i = 190 And i = 230 And i = 360 Then q = i * t x = 0 s = 0 Picture1.PSet Step(x, -s), v
10、bRed Else End IfEnd Sub在轴心公共许用区内取轴心位置，能够满足压力角要求，现取直线红线 与直线绿线的交点为轴心位置，通过解方程组：x=131.557 y=-64.214 r0五绘制凸轮理论廓线和实际廓线Private Sub mand6_Click() 开启计时器；建立坐标系Picture1.Scale (-500, -500)-(500, 500) Timer6.Enabled = True End SubPrivate Sub Timer6_Timer() i为静态变量，控制流程；e为偏距；s为基圆半径平方减去偏距平方再开方所得；q为角度；x为横坐标；y为纵坐标Sta
11、tic i As SingleDim e As Single, q As Single, s As Single, x As Single, y As Single If i = 3.14 / 4 And i = 3.14 / 2 And i = 5 * 3.14 / 6 And i = 19 / 18 * 3.14 And i = 23 / 18 * 3.14 And i = 2 * 3.14 Then q = i x = s * Cos(q) - e * Sin(q) y = s * Sin(q) + e * Cos(q) Picture1.PSet Step(x, -y), vbRed
12、Else End If End SubPrivate Sub mand7_Click() 开启计时器，建立坐标系Timer7.Enabled = TruePicture1.Scale (-10, -500)-(10, 10)End SubPrivate Sub Timer7_Timer() i为静态变量，控制流程；x代表dx/dq;y代表dy/dq；p代表曲率；e为偏距；s为基圆半径平方减去偏距平方再开方所得Static i As SingleDim s As Single, q As Single, x As Single, y As Single, p As Single Picture1
13、.CurrentX = 0 Picture1.CurrentY = -Sqr(e 2 + s 2) If i = 3.14 / 4 And i = 3.14 / 2 And i = 5 / 6 * 3.14 And i = 19 / 18 * 3.14 And i = 23 / 18 * 3.14 And i = 2 * 3.14 Then q = i x = s * (-Sin(q) - e * Cos(q) y = s * Cos(q) - e * Sin(q) p = Sqr(x 2 + y 2) Picture1.PSet Step(q, -p), vbRed Else End IfE
14、nd SubPrivate Sub mand8_Click()Picture1.Scale (-500, -500)-(500, 500) 建立坐标系；开启计时器Timer8.Enabled = TrueEnd SubPrivate Sub Timer8_Timer() i为静态变量，控制流程；q代表角度；x代表dx/dy；y代表dy/dq；a代表理论轮廓的横坐标；b代表理论轮廓的纵坐标；m代表横坐标；n代表纵坐标Static i As SingleDim s As Single, q As Single, x As Single, y As Single, p As Single, rr A
15、s Single, a As Single, b As Single, m As Single, n As Single If i = 3.14 / 4 And i = 3.14 / 2 And i = 5 / 6 * 3.14 And i = 19 / 18 * 3.14 And i = 23 / 18 * 3.14 And i = 2 * 3.14 Then q = i x = s * (-Sin(q) - e * Cos(q) y = s * Cos(q) - e * Sin(q) a = s * Cos(q) - e * Sin(q) b = s * Sin(q) + e * Cos(q) p = Sqr(x 2 + y 2) m = a - rr * y / p n = b + rr * x / p Picture1.PSet Step(m, -n), vbBlack Else End IfEnd Sub内部轮廓为实际轮廓，外部轮廓为理论轮廓。15 / 15
