﻿ MotionDesigner Reference & User Interface > SEGMENT EDITOR > Segment Editor: Segment-Range

# Segment Editor: Segment-Range

### SEGMENT-EDITOR : Segment-Range

Some Traditional Motion-Laws have Segment-Range parameters.

The Segment-Range parameters edit at what phase to start and end the mathematical-function.

One application of Segment-Range is to design Asymmetrical Motions. Start and End Segment Ranges Default Segment-Range : •Start-Range = 0 •End-Range = 1 Limits to the Segment-Range values 0 ≤ Start Range < End Range ≤ 1 Example The three images below show the acceleration graph of a Modified Sinusoid motion-law with different Segment Ranges. Image 1 Modified Sinusoid Motion-Law. Segment-Width = 90º •Start-Range = 0.0 •End-Range = 1.0 Image 2 Segment-Width = 90º •Start-Range = 0.2 ... to remove from 0 - 20% from the start of the Modified-Sinusoid function •End-Range = 1.0 Image 3 Segment-Width = 90º •Start-Range = 0.0 •End-Range = 0.8 ... to remove 80 - 100% of the Modified-Sinusoid function.

### Dwell-Rise-Dwell Asymmetric Motion

Symmetric Segments - The crossover is at the mid-point of the Segment.

Asymmetric Motions - The crossover is earlier or later than the mid-point of the Segment.

Use Asymmetric Motions to modify the acceleration and deceleration timing. For example, if you want a tool to accelerate quickly, to reach its maximum velocity earlier than the mid-point of the segment, and then decelerate more gradually, or vice versa.

You can model an asymmetrical motion with two segments that have the same motion-law.

This example Motion-Law is a Modified Sinusoid. You would usually specify this with one Mod-Sine segment, but we will can imagine it as two segments. #### Orange Line graph - is Symmetrical

Symmetrical Mod-Sine Motion-Law : λ = 0.5

Segment 1

Machine angle - X-axis:  0 - 180º  ( 0 - 0.5 of total duration)

Displacement - Y-axis : 0 - 50 units

Segment Ranges = Start-Range = 0 and End Range = 0.5.

Segment 2

Machine angle - X-axis:  180 - 360º ( 0.5 - 1.0 of total duration)

Displacement - Y-axis:  50- 100 units

Segment Ranges = Start-Range = 0.5 and End-Range = 1.

Black Line graph - is Asymmetrical

Asymmetrical Mod-Sine Motion-Law : λ = 0.25

Crossover @ 0.25 = 90º machine angle.

Segment 1:

Machine angle - X-axis: 0 - 90º (0 - 0.25 of total duration)

Displacement - Y-axis: 0 - 25 units

Segment Ranges = Start-Range = 0 and End Range = 0.5..

Segment 2:

Machine angle - X-axis: 90 - 360º (0.25 - 1.0 of total duration)

Displacement -Y-axis: 75 - 100 units

Segment Ranges = Start-Range = 0.5 and End-Range = 1.

Characteristics Values of Asymmetrical Motion-Law.

Maximum Velocity : Asymmetrical Velocity = Symmetrical Velocity.

Maximum Acceleration: Segment 1 :  Cas = Ca / 2λ ;

Maximum Acceleration: Segment 2 :  Cas = Ca / 2(1-λ)