<< Click to Display Table of Contents >> Navigation: MotionDesigner Reference & User Interface > Motion Laws > FlexiblePolynomial MotionLaw > Throw  QuickReturn: 2: Zero Jerk @ Start/End/MidPoint MotionLaw 
The 'QuickReturn2' motionlaw is Not available in the MotionLaw Selector. The 'QuickReturn2' motionlaw is a Rise & Return motionlaw that is continuous in Velocity, Acceleration and Jerk. Construct the 'QuickReturn 2' motion with two Flexible Polynomial Segments. The first segment is the 'Rise', and the second the 'Return'. Each segment is a 'mirror' of each other. Usually, the segments have an equal duration, but this is not necessary. Continuity at the MidPoint BlendPoint The Position is maximum [P=1], and the Velocity is zero at the midpoint. The Rise segment [below, in Blue] ends with a finite, negative acceleration. The Return segment [below, in Red] starts with the same finite, negative acceleration. There is acceleration continuity when the two segments follow eachother. The Jerk is continuous and zero at the midpoint. The Jerk is also zero at its start an end. The position graph makes a quickreturn at the midpoint because there is a large negative, but continuous, acceleration at the midpoint. See Also: •Quick Return: Finite Jerk @ Start/End/MidPoint •Rapid Return: Finite Jerk @ Start/End/MidPoint •Rapid Return: SmoothStart/End * An acceleration discontinuity would give a very poor dynamic response if applied to any mechanical system. Two Segment 'QuickReturn Motion 2
One Segment 'Rise Segment'
