Throw - Rapid-Return 1: Finite-Jerk @ Start/End/Mid-Point Motion-Law

<< Click to Display Table of Contents >>

Navigation:  MotionDesigner Reference & User Interface > Motion Laws > Flexible-Polynomial Motion-Law >

Throw - Rapid-Return 1: Finite-Jerk @ Start/End/Mid-Point Motion-Law

Throw: Rapid-Return Finite Jerk

The 'Rapid-Return 1' motion-law is Not available in the Motion-Law Selector.

The Rapid-Return-1' motion-law is a Rise & Return motion-law that is continuous in Velocity and Acceleration throughout.

Construct the 'Rapid-Return 1' 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 Mid-Point Blend-Point

The Position is a maximum, and the Velocity is zero.

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. Thus, there is acceleration continuity.

The Jerk is discontinuous at the mid-point. [The Jerk is also discontinuous at its start an end- points].

The position graph makes a rapid-return at the mid-point because there is a large negative, but continuous, acceleration at the mid-point.

The transition from Rise to Return is more rapid than Quick-Return 1 and Quick-Return 2. Thus we call it a Rapid-Return 1.


See Also:

Quick Return 1: Finite Jerk @ Start/End/Mid-Point

Quick Return 2: Zero Jerk @ Start/End/Mid-Point

Rapid Return 2: Smooth-Start/End


* An acceleration discontinuity would give a very poor dynamic response if applied to any mechanical system.

tog_minus        Two Segment 'Rapid-Return Motion 1'