Name Class Student No. Date Ex.3-8 In the six-bar mechanism shown below,XB=0,YB=0,Xr=37.2,Yr=17.5, Yc=28.8,LFE=16.8mm,LEc-=39.2mm,LcD=20.633mm,LDE=36.4mm,ZBGA=90 LBG=9mm,LGA=58mm.Crank FE rotates clockwise at a constant speed of-10 rad/sec.A main program is required to analyze the output motions of point A.The mechanism will be analyzed for the whole cycle when driver FE rotates from 360 to0°with a step size of A0i=-5°， 6
16 Name Class Student No. Date Ex.3-8 In the six-bar mechanism shown below, XB=0, YB=0, XF=37.2, YF=17.5, YC=28.8, LFE=16.8mm, LEC=39.2mm, LCD=20.633mm, LDE=36.4mm, BGA=90, LBG=9mm, LGA=58mm. Crank FE rotates clockwise at a constant speed of -10 rad/sec. A main program is required to analyze the output motions of point A. The mechanism will be analyzed for the whole cycle when driver FE rotates from 360 to 0 with a step size of 1 =-5. A C D E F 2 3 4 5 6 ω1 B
Name. ClassStudent No. Date Ex.4-1 According to link dimensions,determine the type of the pivot four-bar linkages shown below. 90 100 110 70 45 40 120 50 50 100 70 70 7777 77
17 Name Class Student No. Date Ex.4-1 According to link dimensions, determine the type of the pivot four-bar linkages shown below. 40 70 90 110 120 45 100 70 60 50 70 100 90 70 100
Name Class Student No. Date Ex.4-2 In the revolute four-bar mechanism shown below,the crank AB is a driver. (a)Find the pressure angle a and the transmission angle y of the mechanism at the position shown. (b)Find the angular stroke wmax of the link DC. (c)Find the crank acute angle 0 between thetwo limiting positions (d)Find the maximum pressure angle cmax and the minimum transmission angle Ymin. (e)Are there any dead-points in the whole cycle of the motion if link DC is the driver?If so,when or where?Draw the dead-point positions of the mechanism. 3 丹
18 Name Class Student No. Date Ex.4-2 In the revolute four-bar mechanism shown below, the crank AB is a driver. (a) Find the pressure angle and the transmission angle of the mechanism at the position shown. (b) Find the angular stroke max of the link DC. (c) Find the crank acute angle between the two limiting positions. (d) Find the maximum pressure angle max and the minimum transmission angle min. (e) Are there any dead-points in the whole cycle of the motion if link DC is the driver? If so, when or where? Draw the dead-point positions of the mechanism. 1 2 3 4 A B C D
Name. Class Student No. Date_ Ex.4-3 In an offset slider-crank mechanism ABC,crank AB is the driver.The maximum pressure angle.Find the stroke H of the slider and the crank acute angle 0 between the two limiting positions. A 777 7777 Ex.4-4 Determine graphically the angular strokes of rockers AB and CD respectively 77777777 9
19 Name Class Student No. Date Ex.4-3 In an offset slider-crank mechanism ABC, crank AB is the driver. The maximum pressure angle MAX=30. Find the stroke H of the slider and the crank acute angle between the two limiting positions. Ex.4-4 Determine graphically the angular strokes of rockers AB and CD, respectively. A C D A B e
Name Class Student No. Date Ex.4-5 Shown are the two positions,BC and BC.of coupler BC of a revolute four-bar linkage ABCD.Link AB is the driver.The pressure angle a at the first position is 0.The second position of the mechanism is a toggle position.Design the linkage.Describe briefly the drawing steps. C1 O B2 C2
20 Name Class Student No. Date Ex.4-5 Shown are the two positions, B1C1 and B2C2, of coupler BC of a revolute four-bar linkage ABCD. Link AB is the driver. The pressure angle at the first position is 0o . The second position of the mechanism is a toggle position. Design the linkage. Describe briefly the drawing steps. B B C C 1 1 2 2