国 上海文通大学 Position Comparison There is not much difference in the position curves Small position changes can lead to large acceleration changes Durplacement Modified trapezoid Cycloidal Modified sine B ®上支大￥Table for Peak VAJ for Cam Functions Velocity is in m/rad,Acceleration is in m/rad2,Jerk is in m/rad3. TABLE 8-3 Factors for Peak Velocity and Acceleration of Some Cam Functions Function Max.Veloc.Max.Accel.Max.Jerk Comments Constant accel 2.000h/B 4.000h/B2 Infinite ∞jek-not acceptable Harmonic disp. 1.571h/B 4.945h/B2 Infinite oo jerk-not acceptable Trapezoid accel. 2.000h/B 5.300h/B2 44h/B3 Not as good as mod.trap. Mod.trap.accel. 2.000h/B 4.888h/B2 61n/B3 Low accel.but rough jerk Mod.sine accel. 1.760h/B 5.528h/B2 69h/B3 Low veloc..good accel 3-4-5 poly.disp. 1.875h/B 5.777h/B2 60h/B3 Good compromise Cycloidal disp. 2.000h/B 6.283h/B2 40h/B3 Smooth accel.and jerk. 4-5-6-7 poly.disp. 2.188h/B 7.526h/B2 52h/B3 Smooth jerk.high accel. 2828 Position Comparison  There is not much difference in the position curves  Small position changes can lead to large acceleration changes Table for Peak VAJ for Cam Functions  Velocity is in m/rad, Acceleration is in m/rad2, Jerk is in m/rad3